000
FXUS66 KPQR 201005
AFDPQR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
230 AM PST TUE JAN 20 2009
.SYNOPSIS...A STRONG UPPER LEVEL RIDGE WILL CONTINUE TO DOMINATE THE
PACIFIC NORTHWEST THROUGH TODAY...CENTERED NEAR IDAHO. THE UPPER
RIDGE WILL THEN WEAKEN AND MOVE OFF TO THE EAST FOR THE REMAINDER OF
THE WEEK. THE STRONG SURFACE HIGH PRESSURE AREA EAST OF THE CASCADES
WILL ALSO WEAKEN...ESPECIALLY TUESDAY NIGHT AND WEDNESDAY WITH
DECREASING EAST WINDS. THE FIRST PACIFIC WEATHER SYSTEM TO APPROACH
IN QUITE SOME WHILE WILL SPLIT AND WEAKEN AS IT NEARS THE COAST
WEDNESDAY NIGHT AND THURSDAY...THEN EVENTUALLY PUSH THROUGH OUR
FORECAST AREA ABOUT FRIDAY. A SERIES OF WEATHER SYSTEMS MAY BEGIN
PUSHING THROUGH THE PACIFIC NORTHWEST THIS WEEKEND AND EARLY NEXT
WEEK AS THE UPPER AIR PATTERN FINALLY CHANGES.
&&
.SHORT TERM...THE KTTD-KDLS OFFSHORE PRESSURE GRADIENT HAS FINALLY
FALLEN TO LESS THAN 10 MB THIS MORNING...BUT THE DECREASE IS SLOW AND
WINDS ARE STILL QUITE GUSTY THIS MORNING IN AND NEAR THE COLUMBIA
RIVER GORGE AND IN THE EAST COUNTY AREAS THOUGH WIND SPEEDS HAVE
FALLEN BELOW ADVISORY CRITERIA AND WILL CONTINUE TO DIMINISH TODAY.
TROUTDALE WAS STILL GUSTING TO AROUND 30 MPH THIS MORNING. DEWPOINTS
REMAIN VERY LOW ACROSS THE FORECAST AREA THIS MORNING AND THINK THE
BEST CHANCE OF ANY FOG WILL BE DOWN NEAR EUGENE AND POSSIBLY UP NEAR
CASTLE ROCK...BUT THEN PATCHY AT BEST ANYWHERE ELSE.
WINDS WILL LET UP A LOT MORE TONIGHT AND WEDNESDAY AND THINK THE FOG
WILL BEGIN EXPANDING MORE THEN. THE SURFACE PRESSURE GRADIENT IS
STILL OFFSHORE THROUGH THE GORGE AROUND 6 OR 7 MB ON THE NAM12
TONIGHT AND WEDNESDAY...SO THERE WILL STILL BE SOME WIND IN THE GORGE
AND NEAR TROUTDALE. THAT WOULD STILL SUPPORT PEAK GUSTS OF 40 TO 50
MPH IN THE GORGE. PRESSURE GRADIENTS LET UP TO AROUND 5 MB WEDNESDAY
NIGHT WITH GUSTS UP TO 30 OR 35 MPH TOPS IN THE GORGE. EXPECT MORE
FOG IN THE VALLEYS WEDNESDAY NIGHT AS WELL. THE GRADIENTS ARE
WEAKENING AS THE UPPER RIDGE WEAKENS AND THE FIRST PACIFIC WEATHER
SYSTEM IN QUITE SOME TIME APPROACHES...BUT THAT FRONT WILL BE
SPLITTING AND WEAKENING AS IT APPROACHES. THE SOUTHERN PART HEADS
TOWARD CALIFORNIA. THE NORTHERN PART SETS UP OFF THE WASHINGTON AND
OREGON COAST WEDNESDAY NIGHT AND THURSDAY. AS IT DOES...A MARINE
LAYER MAY DEVELOP ALONG THE COAST FROM THE SOUTH LATE WEDNESDAY AND
THURSDAY. SOME MOISTURE FROM THE SOUTHERN PART OF THIS SPLITTING
SYSTEM MAY LIFT BACK NORTH THROUGH CENTRAL AND EASTERN OREGON AND MAY
BRUSH A PART OF OUR AREA. ADDED A SLIGHT CHANCE OF SHOWERS TO THE
LANE COUNTY CASCADES THEN. THE LEFTOVER NORTHERN LOW MAY FINALLY MOVE
ONSHORE AROUND FRIDAY... THOUGH LOOKS LIKE IT WILL MOVE SOUTH ALONG
THE COAST. WILL NOT MAKE ANY CHANGES FOR THAT YET. WILLSON
.LONG TERM...NO CHANGES. PREVIOUS DISCUSSION FOLLOWS...
A LOT OF UNCERTAINTY IN THE EXTENDED FORECAST. LATEST RUNS OF THE
ECMWF AND GFS TRY TO SHOW A PATTERN CHANGE BEGINNING SAT. ENSEMBLE
FORECASTS SHOW A WIDE RANGE OF SOLUTIONS FOR DAYS 5-7. THERE ARE
HINTS THAT A RETURN TO A COLDER AND MORE ACTIVE PATTERN WILL OCCUR
SUN AND CONTINUE THROUGH EARLY NEXT WEEK. WOULD TEND TO LEAN TOWARD
THE ECMWF MODEL FOR THE EXTENDED BASED ON ITS PAST PERFORMANCE.
HEDGED MORE TOWARD CLIMO POPS STARTING SUN. WEISHAAR
&&
.AVIATION...DRY OFFSHORE FLOW CONTINUES...WITH MAINLY VFR CONDITIONS
PREVAILING THIS MORNING. ONLY EXCEPTION MAY BE SOME PATCHY FG/FZFG
IN THE INTERIOR VALLEYS AWAY FROM THE GORGE AS WINDS GO CALM. GUSTS
35-45 KT CONTINUE NEAR THE WEST END OF THE GORGE...WITH GUSTS TO
30-35 KT CONTINUING NEAR KTTD. AIRCRAFT SOUNDINGS SUGGEST CORE OF
STRONG WINDS IS MAINLY CONFINED TO 2000 FT MSL AND BELOW...WITH MUCH
LIGHTER SE FLOW ABOVE. WINDS EASE SLIGHTLY TODAY...BUT GUSTS 25-30
KT STILL POSSIBLE AT KTTD THROUGH THE DAY.
KPDX AND APPROACHES...VFR CONDITIONS PREVAIL TODAY. WINDS ARE EASING
AT KPDX...BUT JUST EAST OF THE RUNWAYS GORGE WINDS CONTINUE WITH
EAST WIND GUSTS 25-35 KT NEAR KTTD. EXPECT SOME SLIGHT EASING IN
THESE WINDS AS THE DAY PROGRESSES.
&&
.MARINE...STRONG HIGH PRESSURE OVER THE INLAND NORTHWEST IS
BEGINNING TO WEAKEN...BUT OFFSHORE FLOW CONTINUES TO PRODUCE LOCALLY
GUSTY WINDS TO 25 KT BELOW GAPS AND COASTAL CANYONS THIS MORNING. AS
HIGH PRESSURE WEAKENS EXPECT WINDS TO EASE OVER THE NEXT 24 HOURS.
VERY WEAK DISTURBANCE WILL TRACK UP THE OREGON COAST WED...POSSIBLY
CAUSING A SHIFT TO LIGHT-MODERATE S-SE WINDS FOR THE COASTAL WATERS.
SEAS EXPECTED TO REMAIN BELOW 10 FT THROUGH AT LEAST FRIDAY. WEAGLE
&&
.PQR WATCHES/WARNINGS/ADVISORIES...
OR/WA...AIR STAGNATION ADVISORY UNTIL WED MORNING FOR SOUTH
WILLAMETTE VALLEY...THE UPPER HOOD RIVER VALLEY...THE
WESTERN COLUMBIA RIVER GORGE NEAR HOOD RIVER...AND THE
LOWER COLUMBIA AND I5 CORRIDOR OF SW WASHINGTON
&&
$$
MORE WEATHER INFORMATION ONLINE AT...
Http://weather.gov/portland
THIS DISCUSSION IS FOR NORTHWEST OREGON AND SOUTHWEST WASHINGTON FROM
THE CASCADE CREST TO 60 NAUTICAL MILES OFFSHORE. THE AREA IS COMMONLY
REFERRED TO AS THE FORECAST AREA.
000
FXUS66 KPQR 200414
AFDPQR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
813 PM PST MON JAN 19 2009
.SYNOPSIS...A STRONG UPPER LEVEL RIDGE WILL CONTINUE TO DOMINATE THE
PACIFIC NORTHWEST THROUGH TUESDAY...CENTERED NEAR IDAHO. THE UPPER
RIDGE WILL THEN WEAKEN AND MOVE OFF TO THE EAST FOR THE REMAINDER OF
THE WEEK. THE STRONG SURFACE LOW EAST OF THE CASCADES WILL ALSO
WEAKEN...ESPECIALLY TUESDAY NIGHT AND WEDNESDAY WITH DECREASING EAST
WINDS. THE FIRST WEATHER SYSTEM TO APPROACH IN QUITE SOME WHILE WILL
SPLIT AND WEAKEN AS IT NEARS THE COAST WEDNESDAY NIGHT AND
THURSDAY...THEN EVENTUALLY PUSH THROUGH OUR FORECAST AREA ABOUT
FRIDAY. A SERIES OF SYSTEMS MAY BEGIN PUSHING THROUGH THE PACIFIC
NORTHWEST THIS WEEKEND AND EARLY NEXT WEEK AS THE UPPER AIR PATTERN
FINALLY CHANGES.
&&
.SHORT TERM...THE KTTD-KDLS GRADIENT HAS FINALLY DECREASED TO LESS
THAN 11 MB OFFSHORE THIS EVENING...BUT DECIDED TO HOLD ONTO THE WIND
ADVISORY NEAR THE WEST END OF THE GORGE FOR A FEW MORE HOURS THIS
EVENING. SUSPECT I WILL DROP IT FOR THE EVENING FORECAST PACKAGE. IT
WILL STILL BE WINDY THROUGH THE GORGE AND IN THE EAST COUNTY AREAS
TONIGHT AND A GOOD PART OF TUESDAY...JUST LESS THAN THE LAST 48 TO 72
HOURS. DEWPOINTS REMAIN VERY LOW ACROSS THE FORECAST AREA THIS
EVENING AND THINK THE BEST CHANCE OF ANY FOG WILL BE DOWN NEAR EUGENE
AND POSSIBLY UP NEAR CASTLE ROCK...BUT THEN PATCHY AT BEST ANYWHERE
ELSE.
WINDS LET UP A LOT MORE TUESDAY NIGHT AND WEDNESDAY AND THINK THE FOG
WILL BEGIN EXPANDING MORE THEN. THE GRADIENT IS STILL OFFSHORE
THROUGH THE GORGE AROUND 6 OR 7 MB ON THE NAM12 TUESDAY NIGHT AND
WEDNESDAY...SO THERE WILL STILL BE SOME WIND IN THE GORGE AND NEAR
TROUTDALE. THAT WOULD STILL SUPPORT PEAK GUSTS OF 40 TO 50 MPH IN THE
GORGE. GRADIENTS LET UP TO AROUND 5 MB WEDNESDAY NIGHT WITH GUSTS UP
TO 30 OR 35 MPH TOPS IN THE GORGE. EXPECT MORE FOG IN THE VALLEYS
WEDNESDAY NIGHT AS WELL.
THE GRADIENTS ARE WEAKENING AS THE UPPER RIDGE WEAKENS AND THE FIRST
SYSTEM IN QUITE SOME TIME APPROACHES...BUT SPLITTING AS IT DOES
APPROACH. THE SOUTHERN PART HEADS TOWARD CALIFORNIA. THE NORTHERN
PART SETS UP OFF THE WASHINGTON AND OREGON COASTS WEDNESDAY NIGHT AND
THURSDAY. AS IT DOES...IT DOES APPEAR A MARINE LAYER MAY DEVELOP
ALONG THE COAST FROM THE SOUTH LATE WEDNESDAY AND THURSDAY. SOME
MOISTURE FROM THE SOUTHERN PART OF THIS SPLITTING SYSTEM MAY LIFT
BACK NORTH THROUGH CENTRAL AND EASTERN OREGON AND MAY BRUSH A PART OF
OUR AREA. CURRENT FORECAST IS DRY FOR THIS PERIOD...AND WILL NOT
CHANGE YET BUT THIS BEARS WATCHING. HAVE MADE SOME ADJUSTMENTS TO
EARLIER PERIODS OF THE FORECAST THIS EVENING AS A MODEL CONSENSUS
SEEMS TO BE EMERGING.
THE LEFTOVER NORTHERN LOW MAY FINALLY MOVE ONSHORE AROUND FRIDAY...
THOUGH THE ECMWF NOW TAKES IT SOUTH ALONG THE COAST. WILL NOT MAKE
ANY CHANGES FOR THAT YET. TOLLESON
.LONG TERM...NO CHANGES. PREVIOUS DISCUSSION FOLLOWS...
A LOT OF UNCERTAINTY IN THE EXTENDED FORECAST. LATEST RUNS OF THE
ECMWF AND GFS TRY TO SHOW A PATTERN CHANGE BEGINNING SAT. ENSEMBLE
FORECASTS SHOW A WIDE RANGE OF SOLUTIONS FOR DAYS 5-7. THERE ARE
HINTS THAT A RETURN TO A COLDER AND MORE ACTIVE PATTERN WILL OCCUR
SUN AND CONTINUE THROUGH EARLY NEXT WEEK. WOULD TEND TO LEAN TOWARD
THE ECMWF MODEL FOR THE EXTENDED BASED ON ITS PAST PERFORMANCE.
HEDGED MORE TOWARD CLIMO POPS STARTING SUN. WEISHAAR
&&
.AVIATION...DRY OFFSHORE FLOW REMAINS IN PLACE. WILL STILL HAVE E
WINDS GUSTING 35 TO 45 KT IN AND NEAR THE WEST END OF THE COLUMBIA
GORGE THROUGH 12Z. THIS OFFSHORE FLOW WILL GRADUALLY WEAKEN TONIGHT
THRU MON. ONLY REAL CONCERN FOR AIRPORTS...ASIDE FROM FROSTY
CONDITIONS TONIGHT...WILL BE PATCHY SHALLOW FOG THRU THE INTERIOR
VALLEYS AFT 08Z TO THE S OF PORTLAND. FCSTR...ROCKEY.
KPDX AND APPROACHES...NO SIGNIFICANT WEATHER IMPACTS EXPECTED. E
WINDS WILL GRADUALLY WEAKEN TONIGHT AND MON. EXPECT GUSTS TO 25 KT
TIL 10Z AT KPDX.
&&
.MARINE...HIGH PRES OVER INLAND PAC NW WILL WEAKEN THROUGH TUE. QUIET
ON THE WATERS...BUT STILL ENOUGH FLOW TO MAINTAIN OCCASIONAL GUSTS
TO 25 KT IN THE COASTAL GAPS UNTIL LATER TONIGHT. SEAS WILL REMAIN
NEAR 6 FT THRU THIS WEEK.
&&
.PQR WATCHES/WARNINGS/ADVISORIES...
OR/WA...AIR STAGNATION ADVISORY UNTIL WED MORNING FOR SOUTH
WILLAMETTE VALLEY...THE UPPER HOOD RIVER VALLEY...THE
WESTERN COLUMBIA RIVER GORGE NEAR HOOD RIVER...AND THE
LOWER COLUMBIA AND I5 CORRIDOR OF SW WASHINGTON
&&
$$
MORE WEATHER INFORMATION ONLINE AT...
HTTP://WEATHER.GOV/PORTLAND
THIS DISCUSSION IS FOR NORTHWEST OREGON AND SOUTHWEST WASHINGTON FROM
THE CASCADE CREST TO 60 NAUTICAL MILES OFFSHORE. THE AREA IS COMMONLY
REFERRED TO AS THE FORECAST AREA.
000
FXUS66 KPQR 192230
AFDPQR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
230 PM PST MON JAN 19 2009
.SYNOPSIS...A STRONG UPPER LEVEL RIDGE WILL CONTINUE TO DOMINATE THE
PACIFIC NORTHWEST THROUGH WEDNESDAY. THE RIDGE WILL SLOWLY MIGRATE TO
THE EAST DURING THE LATTER PART OF THE WEEK. STRONG OFFSHORE SURFACE
GRADIENTS WILL SLOWLY WEAKEN TONIGHT AND CONTINUE TO ABATE TUE
THROUGH WED. A WEATHER SYSTEM APPROACHES THE COAST LATE WED AND WED
NIGHT...BUT WILL SPLIT. A SPLIT IN THE UPPER AIR PATTERN WILL
CONTINUE THU AND FRI...FOLLOWED BY A POSSIBLE PATTERN CHANGE DURING
THE WEEKEND.
&&
.SHORT TERM...KTTD-KDLS GRADIENT HOLDING NEAR -12.0 MB EARLY THIS
AFTERNOON. KTTD REPORTED GUSTS TO 45 MPH SHORTLY BEFORE NOON.
THUS...DECIDED TO EXTEND THE WIND ADVISORY THROUGH 01Z TUE. LATEST
NAM-12 MODEL SHOWS A VERY GRADUAL WEAKENING OF THE GRADIENT 00Z TO
12Z TUE. THE GRADIENT IS PROGGED TO DROP OFF EVEN MORE TUE. THE
WEAKER GRADIENT WILL MEAN CONTINUED AIR QUALITY PROBLEMS THROUGH AT
LEAST WED AND LIKELY THROUGH THU. IN FACT...WILL LIKELY HAVE TO
EXPAND THE ASA TO COVER MORE OF THE WILLAMETTE VALLEY.
VERY GRADUAL CHANGES IN THE LARGE-SCALE PATTERN BEGINNING LATE TUE.
500 MB RIDGE AXIS THAT HAS BEEN PLANTED OVER THE NRN ROCKIES THE PAST
COUPLE OF DAYS WILL START TO EDGE EAST LATE TUE AND TUE NIGHT AS A
WEAK SYSTEM APPROACHES THE COAST. THE SYSTEM WILL SPLIT WED AS IT
GETS CLOSER TO THE COAST. ONE PIECE DIVES SOUTH ALONG THE CALIFORNIA
COAST AND THE OTHER PIECE SITS AND SPINS OFF THE WA COAST. SPLIT FLOW
ALOFT WED AND THU. KEPT THE FORECAST DRY THROUGH THU BUT SOME
MOISTURE FROM THE SOUTHERN PIECE OF THE SPLIT TROUGH COULD GET CLOSE
TO THE S END OF THE LANE COUNTY CASCADES. ECMWF AND GFS SHOW A
SOUTHERN BRANCH LOW MOVING TOWARD THE CALIFORNIA COAST THU NIGHT.
THIS MAY BE ENOUGH TO PHASE WITH THE NORTHERN LOW AND GIVE A THREAT
OF PRECIP TO THE AREA FRI. WEISHAAR
.LONG TERM...A LOT OF UNCERTAINTY IN THE EXTENDED FORECAST. LATEST
RUNS OF THE ECMWF AND GFS TRY TO SHOW A PATTERN CHANGE BEGINNING SAT.
ENSEMBLE FORECASTS SHOW A WIDE RANGE OF SOLUTIONS FOR DAYS 5-7. THERE
ARE HINTS THAT A RETURN TO A COLDER AND MORE ACTIVE PATTERN WILL
OCCUR SUN AND CONTINUE THROUGH EARLY NEXT WEEK. WOULD TEND TO LEAN
TOWARD THE ECMWF MODEL FOR THE EXTENDED BASED ON ITS PAST
PERFORMANCE. HEDGED MORE TOWARD CLIMO POPS STARTING SUN. WEISHAAR
&&
.AVIATION...A SLOW WEAKENING OF THE OFFSHORE GRADIENT WILL CONTINUE
TONIGHT. VFR AT ALL SITES THIS AFTERNOON WITH VERY DRY AIR IN PLACE.
MAY SEE A RETURN OF PATCHY FREEZING FOG LATER TONIGHT ESPECIALLY IN
THE CENTRAL AND SOUTH WILLAMETTE VALLEY...AND THE LOWER COLUMBIA
NEAR KSPB-KKLS.
KPDX AND APPROACHES...VFR FOR THE NEXT 24 HOURS. CONTINUED EAST WIND
FROM THE GORGE THROUGH THIS EVENING...BUT SLOWLY WEAKENING.
&&
.MARINE...VERY QUIET ON THE WESTERN FRONT. HIGH PRESSURE WELL INLAND
WILL CONTINUE TO WEAKEN THROUGH THE WEEK. A FEW GUSTS TO 25 KT ARE
POSSIBLE NEAR TERRAIN GAPS THIS EVENING. SEAS WILL REMAIN BELOW 10
FT THROUGH THE WEEK.
&&
.PQR WATCHES/WARNINGS/ADVISORIES...
OR/WA...AIR STAGNATION ADVISORY UNTIL WED MORNING FOR SOUTH
WILLAMETTE VALLEY...THE UPPER HOOD RIVER VALLEY...THE
WESTERN COLUMBIA RIVER GORGE NEAR HOOD RIVER...AND THE
LOWER COLUMBIA AND I5 CORRIDOR OF SW WASHINGTON
WIND ADVISORY EAST PART OF THE PORTLAND/VANCOUVER AREA
NEAR THE GORGE THROUGH 5 PM TODAY.
&&
$$
MORE WEATHER INFORMATION ONLINE AT...
http://weather.gov/portland
THIS DISCUSSION IS FOR NORTHWEST OREGON AND SOUTHWEST WASHINGTON FROM
THE CASCADE CREST TO 60 NAUTICAL MILES OFFSHORE. THE AREA IS COMMONLY
REFERRED TO AS THE FORECAST AREA.
000
FXUS66 KPQR 191011
AFDPQR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
230 AM PST MON JAN 19 2009
.SYNOPSIS...A STRONG UPPER LEVEL RIDGE WILL CONTINUE TO DOMINATE THE
PACIFIC NORTHWEST EARLY THIS WEEK...SLOWLY WEAKENING AND MOVING OFF
TO THE EAST MID TO LATE WEEK. STRONG SURFACE HIGH PRESSURE EAST OF
THE CASCADES WILL GRADUALLY WEAKEN...ESPECIALLY TUESDAY AND
WEDNESDAY...IN TURN WEAKENING THE OFFSHORE FLOW THROUGH THE GORGE.
THE STRONG INVERSION RESULTING FROM THE HIGH PRESSURE WILL ALSO
WEAKEN OVER THE NEXT COUPLE OF DAYS. AROUND MIDWEEK A TROUGH OF LOW
PRESSURE WILL APPROACH THE WEST COAST...BUT WILL BE WEAKENING AS IT
MOVES IN LATE IN THE WEEK.
&&
.SHORT TERM...THE STRONG OFFSHORE GRADIENTS THROUGH THE GORGE AS
MEASURED FROM KTTD TO KDLS HAVE EASED A LITTLE SINCE LAST NIGHT BUT
THE ASTORIA TO DALLES GRADIENT ACTUALLY INCREASED TO 15.7 MILLIBARS
OVER THE LAST HOUR AND CORBETT HAS BEEN GUSTING TO 60 TO 70 MPH OVER
THE LAST SEVERAL HOURS. THE GUSTS AT TROUTDALE INCREASED TO 46 MPH
AGAIN THIS HOUR. WILL HOLD ONTO THE WIND ADVISORY EAST PART OF THE
PORTLAND AND VANCOUVER METRO AREA TIL NOON AND EXPECT TO LET THE
GORGE WIND WARNING EXPIRE AT 5 AM AS SCHEDULED BUT WILL CONTINUE TO
EVALUATE THAT AS WRF MODEL STILL HOLDS STRONG FLOW IN THE CROSS
SECTIONS FOR A LITTLE BEYOND THAT...AT ANY RATE WINDS WILL STILL BE
QUITE GUSTY THERE. THE MODEL CROSS SECTIONS SHOW THE GRADIENT AND
WINDS RELAXING A BIT LATER TODAY SO SHOULD BE ABLE TO DROP ALL WIND
HAZARDS BY THAT POINT. STILL A MODERATE GRADIENT THROUGH THE GORGE
TONIGHT AND TUESDAY MORNING. THEN THE GRADIENT RELAXES EVEN MORE LATE
TUESDAY AND WEDNESDAY.
THE TEMPERATURE/DEWPOINT SPREADS IN THE SOUTH VALLEY ARE DECREASING
AND STILL THINK WE WILL SEE SOME FOG AND FREEZING FOG DEVELOP
THERE...AND MAYBE A LITTLE PATCHY FOG IN THE CENTRAL VALLEY. ALSO
SHOULD SEE SOME FOG IN THE SOUTHWEST WASHINGTON NEAR CASTLE ROCK. IT
IS PRETTY DRY AND WINDY IN THE PORTLAND AND VANCOUVER AREA BUT THE
LAST OBSERVATION AT HILLSBORO EARLIER THIS EVENING SHOWED ZERO SPREAD
THERE. SHOULD SEE A SLOW EXPANSION OF THE FOG TONIGHT INTO TUESDAY
MORNING AS WINDS EASE. EXPECT MORE EXPANSION OF THE FOG AREAS TUESDAY
NIGHT AND WEDNESDAY MORNING. THE FOG MAY HAVE TROUBLE CLEARING IN THE
SOUTH AS WE GET INTO WEDNESDAY AND WINDS BECOME MUCH LIGHTER.
IT LOOKS DRY THROUGH WEDNESDAY. THE UPPER RIDGE STARTS TO BREAK DOWN
LATE IN THE WEEK BUT THE INITIAL SYSTEM SPLITS AND MAY NOT SURVIVE AS
IT COMES ONSHORE. WILLSON
.LONG TERM...NO CHANGES. PREVIOUS DISCUSSION FOLLOWS...
MODELS CONTINUE TO INDICATE THE PRESENCE OF A LONGWAVE RIDGE NEAR THE
WEST COAST GOING INTO THE SECOND HALF OF THE WEEK...BUT STILL HAVING
TROUBLES RESOLVING WHAT HAPPENS TO SHORTWAVE ENERGY MOVING INTO THE
RIDGE. WITH VARIATIONS ON SPLITTING THE ENERGY AS IT MOVES IN THE
DOMINANT THEME...TEND TO BELIEVE THAT POPS SHOULD REMAIN LOW THROUGH
THE END OF THE WEEK...BUT ENOUGH DOUBT EXISTS TO CONTINUE TO INCLUDE
SUB CLIMATOLOGY POPS. GOING INTO THE WEEKEND MODEL TRENDS MORE
TOWARDS TROUGHINESS...SO INCREASING POPS LOOK TO BE IN ORDER.
&&
.AVIATION...A SLOW WEAKENING OF THE GRADIENT TODAY AND TONIGHT. VFR
AT ALL SITES WITH EXCEPTION OF ISOLATED LIFR IN SHALLOW FREEZING FOG
IN THE WIND-SHELTERED LOWLANDS OF SW WA AND IN THE S END OF THE
WILLAMETTE VALLEY FOR A FEW HOURS THIS MORNING. MAY SEE A RETURN OF
PATCHY FREEZING FOG LATER TONIGHT ESPECIALLY IN THE CENTRAL AND
SOUTH WILLAMETTE VALLEY...AND THE LOWER COLUMBIA NEAR KSPB-KKLS.
NOTE: KHIO TAF WILL BE NIL`D DUE TO LACK OF OBSERVATION FROM THE
SITE AND RELIABLE COMPLEMENTARY OBSERVATIONS THIS TIME OF DAY. TAF
WILL RESUME ONCE OBSERVATIONS BECOME AVAILABLE.
KPDX AND APPROACHES...VFR FOR THE NEXT 24 HOURS. CONTINUED EAST WIND
FROM THE GORGE THROUGH TODAY...BUT SLOWLY WEAKENING.
&&
.MARINE...MAIN CONCERN IS WIND GUSTS AROUND 25 TO 30 KT HAVE BEEN
PERSISTENT NEAR GAPS IN COASTAL TERRAIN. NAM12 AND LOCAL WRF MODEL
RUNS SUPPORT THIS SCENARIO. SO WILL ISSUE A SMALL CRAFT ADVISORY FOR
THE NEARSHORE MARINE ZONES EFFECTIVE THROUGH 10 AM. WIND WILL THEN
EASE FOR THE AFTERNOON. SEAS TO REMAIN AROUND 8 FT TODAY THEN
DIMINISH EVEN MORE TUE AND WED. ROUGH COLUMBIA BAR DURING THE EBB
LATE THIS MORNING.
&&
.PQR WATCHES/WARNINGS/ADVISORIES...
OR/WA...SMALL CRAFT ADVISORY FOR ROUGH BAR LATE THIS MORNING
THROUGH EARLY AFTERNOON.
SMALL CRAFT ADVISORY FOR WIND NEAR GAPS IN COASTAL TERRAIN
FROM CAPE SHOALWATER TO FLORENCE OUT 20 NM.
AIR STAGNATION ADVISORY UNTIL WED MORNING FOR SOUTH
WILLAMETTE VALLEY...THE UPPER HOOD RIVER VALLEY...THE
WESTERN COLUMBIA RIVER GORGE NEAR HOOD RIVER...AND THE
LOWER COLUMBIA AND I5 CORRIDOR OF SW WASHINGTON
WIND ADVISORY EAST PART OF THE PORTLAND/VANCOUVER AREA
NEAR THE GORGE THROUGH NOON TODAY.
HIGH WIND WARNING WESTERN COLUMBIA RIVER GORGE THROUGH 5 AM
THIS MORNING.
&&
$$
MORE WEATHER INFORMATION ONLINE AT...
HTTP://WEATHER.GOV/PORTLAND
THIS DISCUSSION IS FOR NORTHWEST OREGON AND SOUTHWEST WASHINGTON FROM
THE CASCADE CREST TO 60 NAUTICAL MILES OFFSHORE. THE AREA IS COMMONLY
REFERRED TO AS THE FORECAST AREA.
000
FXUS66 KPQR 190422
AFDPQR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
822 PM PST SUN JAN 18 2009
.SYNOPSIS...A STRONG UPPER LEVEL RIDGE WILL CONTINUE TO DOMINATE THE
PACIFIC NORTHWEST EARLY THIS WEEK...SLOWLY WEAKENING AND MOVING OFF
TO THE EAST MID TO LATE WEEK. STRONG SURFACE HIGH PRESSURE EAST OF
THE CASCADES WILL GRADUALLY WEAKEN...ESPECIALLY TUESDAY AND
WEDNESDAY...IN TURN WEAKENING THE OFFSHORE FLOW THROUGH THE GORGE.
THE STRONG INVERSION RESULTING FROM THE HIGH PRESSURE WILL ALSO
WEAKEN OVER THE NEXT COUPLE OF DAYS. AROUND MIDWEEK A TROUGH OF LOW
PRESSURE WILL APPROACH THE WEST COAST...BUT WILL BE WEAKENING AS IT
MOVES IN LATE IN THE WEEK.
&&
.SHORT TERM...THE STRONG OFFSHORE GRADIENTS THROUGH THE GORGE AS
MEASURED FROM KTTD TO KDLS HAVE RUN BETWEEN 13 AND 14 MB MUCH OF LAST
NIGHT AND TODAY...AND HAVE EASED A LITTLE TO NEAR 12 MB AT 7 PM...BUT
THIS IS STILL VERY STRONG. THE CORBETT WIND DATA REAPPEARED THIS
AFTERNOON...AND THEIR STRONGEST GUST OF 75 MPH OCCURRED AT 730 PM
THIS EVENING. WINDS AT TROUTDALE HAVE EASED A BIT WITH GUSTS CLOSER
TO 40 MPH. I AM GOING TO LOOK AT THINGS ONE LAST TIME BEFORE THE
FINAL DECISION...BUT I THINK I WILL CONTINUE THE HIGH WIND WARNING IN
THE GORGE OVERNIGHT...AND REPLACE THE PORTLAND/VANCOUVER WIND WARNING
WITH A WIND ADVISORY THROUGH MONDAY MORNING.
THE MODELS ALL SHOW THE GRADIENT RELAXING A BIT LATER MONDAY SO
SHOULD BE ABLE TO DROP ALL WIND HAZARDS BY THAT POINT. STILL A
MODERATE GRADIENT THROUGH THE GORGE MONDAY NIGHT AND TUESDAY MORNING.
THEN THE GRADIENT RELAXES EVEN MORE LATE TUESDAY AND WEDNESDAY.
STILL THINK WE WILL SEE SOME FOG AND FREEZING FOG DEVELOP IN THE
SOUTH WILLAMETTE VALLEY WITH NARROW SPREADS NEAR EUGENE AND
CORVALLIS...AND MAYBE A LITTLE PATCHY FOG IN THE CENTRAL VALLEY. ALSO
SHOULD SEE SOME FOG IN THE SOUTHWEST WASHINGTON NEAR CASTLE ROCK. IT
IS PRETTY DRY IN THE PORTLAND AND VANCOUVER AREA. SHOULD SEE A SLOW
EXPANSION OF THE FOG MONDAY NIGHT INTO TUESDAY MORNING AS WINDS
EASE...POSSIBLY GETTING CLOSE TO HILLSBORO AND WILSONVILLE. EXPECT
MORE EXPANSION TUESDAY NIGHT AND WEDNESDAY MORNING. THE FOG MAY HAVE
TROUBLE CLEARING IN THE SOUTH AS WE GET INTO WEDNESDAY AND WINDS ARE
MUCH LIGHTER.
WINDS AND POLLUTION READINGS IN THE CENTRAL WILLAMETTE VALLEY DID NOT
SUPPORT CONTINUING THE AIR STAGNATION ADVISORY THERE...SO DROPPED
EARLIER THIS EVENING.
IT LOOKS DRY THROUGH WEDNESDAY. THE UPPER RIDGE STARTS TO BREAK DOWN
LATE IN THE WEEK BUT THE INITIAL SYSTEM SPLITS AND MAY NOT SURVIVE AS
IT COMES ONSHORE. TOLLESON
.LONG TERM...NO CHANGES. PREVIOUS DISCUSSION FOLLOWS...
MODELS CONTINUE TO INDICATE THE PRESENCE OF A LONGWAVE RIDGE NEAR THE
WEST COAST GOING INTO THE SECOND HALF OF THE WEEK...BUT STILL HAVING
TROUBLES RESOLVING WHAT HAPPENS TO SHORTWAVE ENERGY MOVING INTO THE
RIDGE. WITH VARIATIONS ON SPLITTING THE ENERGY AS IT MOVES IN THE
DOMINANT THEME...TEND TO BELIEVE THAT POPS SHOULD REMAIN LOW THROUGH
THE END OF THE WEEK...BUT ENOUGH DOUBT EXISTS TO CONTINUE TO INCLUDE
SUB CLIMATOLOGY POPS. GOING INTO THE WEEKEND MODEL TRENDS MORE
TOWARDS TROUGHINESS...SO INCREASING POPS LOOK TO BE IN ORDER.
&&
.AVIATION...LITTLE CHANGE WITH STILL SUGGESTS A SLOW WEAKENING OF
THE GRADIENT THIS EVENING THROUGH MON. VFR AT ALL SITES WITH
EXCEPTION OF ISOLATED LIFR IN SHALLOW FOG DEVELOPING BY 08-12Z IN
WIND-SHELTERED LOWLANDS OF SW WA AND IN THE S END OF THE WILLAMETTE
VALLEY.
KPDX AND APPROACHES...LITTLE CHANGE. CONTINUED EAST WIND THROUGH
MON...BUT SLOWLY WEAKENING.
&&
.MARINE...OCCASIONAL GAP WIND GUSTS OF 20 TO 25 KT ARE POSSIBLE OVER
THE N WATERS TONIGHT BUT SHOULD ONLY BE ISOLATED. WIND CONTINUES TO
WEAKEN MON. SEAS TO REMAIN AROUND 8 FT THROUGH MON THEN DIMINISH EVEN
MORE TUE AND WED. LONG PERIOD SWELL PERSISTS THROUGH MON. ROUGH
COLUMBIA BAR DURING EBBS.
&&
.PQR WATCHES/WARNINGS/ADVISORIES...
OR/WA...SMALL CRAFT ADVISORY FOR ROUGH BAR LATE THIS EVENING AND
LATE MON MORNING THROUGH EARLY AFTERNOON.
AIR STAGNATION ADVISORY UNTIL WED MORNING FOR SOUTH
WILLAMETTE VALLEY...THE UPPER HOOD RIVER VALLEY...THE
WESTERN COLUMBIA RIVER GORGE NEAR HOOD RIVER...AND THE
LOWER COLUMBIA AND I5 CORRIDOR OF SW WASHINGTON
HIGH WIND WARNING EAST PART OF THE PORTLAND/VANCOUVER AREA
NEAR THE GORGE THROUGH 10 PM THIS EVENING.
HIGH WIND WARNING WESTERN COLUMBIA RIVER GORGE THROUGH 10 PM
THIS EVENING.
&&
$$
MORE WEATHER INFORMATION ONLINE AT...
HTTP://WEATHER.GOV/PORTLAND
THIS DISCUSSION IS FOR NORTHWEST OREGON AND SOUTHWEST WASHINGTON FROM
THE CASCADE CREST TO 60 NAUTICAL MILES OFFSHORE. THE AREA IS COMMONLY
REFERRED TO AS THE FORECAST AREA.
000
FXUS66 KPQR 182148
AFDPQR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
147 PM PST SUN JAN 18 2009
.SYNOPSIS...A STRONG RIDGE OF HIGH PRESSURE ALOFT WILL SLOWLY SHIFT
OFF TO THE E OVER THE NEXT FEW DAYS. SURFACE HIGH PRESSURE E OF THE
CASCADES WILL GRADUALLY WEAKEN...IN TURN WEAKENING THE OFFSHORE
FLOW THROUGH THE GORGE. THE STRONG INVERSION RESULTING FROM THE HIGH
PRESSURE WILL ALSO WEAKEN OVER THE NEXT COUPLE OF DAYS. AROUND
MIDWEEK A TROUGH OF LOW PRESSURE WILL APPROACH THE WEST COAST...BUT
WILL BE WEAKENING AS IT MOVES IN.
&&
.SHORT TERM...CROSS GORGE PRESSURE GRADIENTS HAVE NOT LET UP SINCE
THIS MORNING...WITH THE KPDX-KDLS GRADIENT STILL AROUND 14 MB.
ROOSTER ROCK REGISTERED ITS HIGHEST RECORDED GUST YET TODAY AT 69 MPH
IN THE PAST HOUR. BOTH NAM AND WRF MODELS CONTINUE TO INDICATE
GRADIENTS SHOULD DECREASE THIS EVENING...BUT GIVEN CURRENT TRENDS
WILL NEED TO EXTEND THE HIGH WIND WARNING INTO THE EVENING HOURS.
WITH THE UPPER RIDGE SHIFTING E...MODELS SLOWLY WEAKEN THE SURFACE
HIGH OVER THE COLUMBIA BASIN MON...ALLOWING WINDS TO SLOWLY DECREASE
OVER THE NEXT COUPLE DAYS. MODEL SOUNDINGS INDICATE SUBSIDENCE
INVERSION TO LAST THROUGH TUE NIGHT...SO WILL HANG ONTO THE AIR
STAGNATION ADVISORY UNTIL WED MORNING. DRYING OFFSHORE FLOW HAS
ALLOWED VIRTUALLY OF THE LOW CLOUDS AND FOG ON THE WEST SIDE OF THE
CASCADE IN THE FORECAST AREA TO DISAPPEAR TODAY...AND WITH CONTINUED
OFFSHORE FLOW EXPECT REDEVELOPMENT OF LOW CLOUDS AND FOG TONIGHT TO
BE MINIMAL. AS WINDS EASE SOME OVER SUBSEQUENT NIGHTS...POTENTIAL FOR
FOG FORMATION SHOULD INCREASE AGAIN. EXPECT THE SUBSIDENCE INVERSION
TO MAINTAIN CLOUDS IN THE COLUMBIA BASIN THAT EXTEND INTO THE GORGE
AND UPPER HOOD RIVER VALLEY FOR A COUPLE MORE DAYS.
WILL DROP THE CHANCE FOR SHOWERS ON WED AS MODELS ARE TRENDING TO A
SLOWER MORE SPLIT TYPE SOLUTION WITH THE TROUGH ATTEMPTING TO MOVE
INTO THE LONGWAVE RIDGE POSITION.
&&
.LONG TERM...MODELS CONTINUE TO INDICATE THE PRESENCE OF A LONGWAVE
RIDGE NEAR THE WEST COAST GOING INTO THE SECOND HALF OF THE
WEEK...BUT STILL HAVING TROUBLES RESOLVING WHAT HAPPENS TO SHORTWAVE
ENERGY MOVING INTO THE RIDGE. WITH VARIATIONS ON SPLITTING THE ENERGY
AS IT MOVES IN THE DOMINANT THEME...TEND TO BELIEVE THAT POPS SHOULD
REMAIN LOW THROUGH THE END OF THE WEEK...BUT ENOUGH DOUBT EXISTS TO
CONTINUE TO INCLUDE SUB CLIMATOLOGY POPS. GOING INTO THE WEEKEND
MODEL TRENDS MORE TOWARDS TROUGHINESS...SO INCREASING POPS LOOK TO BE
IN ORDER.
&&
.AVIATION...LITTLE CHANGE FROM THE 18Z FORECAST CYCLE. OFFSHORE
GRADIENT KTTD-KDLS STILL A LITTLE OVER -13.0 MB AS OF 21Z.
HOWEVER...NAM-12 MODEL STILL SUGGESTS A SLOW WEAKENING OF THE
GRADIENT THIS EVENING THROUGH MON. VFR AT ALL SITES THROUGH THE 00Z
FORECAST PERIOD. ISOLATED LIFR IN SHALLOW FOG DEVELOPING BY 06Z IN
WIND-SHELTERED LOWLANDS OF SW WA AND IN THE S END OF THE WILLAMETTE
VALLEY.
KPDX AND APPROACHES...LITTLE CHANGE. CONTINUED EAST WIND THROUGH
MON...ALTHOUGH STRONGEST WIND WILL BE THROUGH 06Z TONIGHT. WEISHAAR
&&
.MARINE...GUSTY GAP WIND HAS DIMINISHED A LITTLE THIS AFTERNOON.
THUS...THE SMALL CRAFT ADVISORY FOR WIND EXPIRED. THINK GAP WIND
GUSTS OF 20 TO 25 KT ARE POSSIBLE OVER THE N WATERS TONIGHT BUT
SHOULD ONLY BE ISOLATED. WIND CONTINUES TO WEAKEN MON. SEAS TO
REMAIN AROUND 8 FT THROUGH MON THEN DIMINISH EVEN MORE TUE AND WED.
LONG PERIOD SWELL PERSISTS THROUGH MON. ROUGH COLUMBIA BAR DURING
EBBS. WEISHAAR
&&
.PQR WATCHES/WARNINGS/ADVISORIES...
OR/WA...SMALL CRAFT ADVISORY FOR ROUGH BAR LATE THIS EVENING AND
LATE MON MORNING THROUGH EARLY AFTERNOON.
AIR STAGNATION ADVISORY UNTIL WED MORNING FOR SOME OF THE
LOWER INTERIOR VALLEYS OF NW OREGON AND SW WA.
HIGH WIND WARNING EAST PART OF THE PORTLAND/VANCOUVER AREA
NEAR THE GORGE THROUGH 10 PM THIS EVENING.
HIGH WIND WARNING WESTERN COLUMBIA RIVER GORGE THROUGH 10 PM
THIS EVENING.
&&
$$
MORE WEATHER INFORMATION ONLINE AT...
HTTP://WEATHER.GOV/PORTLAND
THIS DISCUSSION IS FOR NORTHWEST OREGON AND SOUTHWEST WASHINGTON FROM
THE CASCADE CREST TO 60 NAUTICAL MILES OFFSHORE. THE AREA IS COMMONLY
REFERRED TO AS THE FORECAST AREA.
000
FXUS66 KPQR 181653
AFDPQR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
852 AM PST SUN JAN 18 2009
.SYNOPSIS...A STRONG RIDGE OF HIGH PRESSURE ALOFT WILL SLOWLY SHIFT
OFF TO THE E OVER THE NEXT FEW DAYS. SURFACE HIGH PRESSURE E OF THE
CASCADES WILL THEN GRADUALLY WEAKEN...IN TURN WEAKENING THE OFFSHORE
FLOW THROUGH THE GORGE. THE STRONG INVERSION RESULTING FROM THE HIGH
PRESSURE WILL ALSO WEAKEN OVER THE NEXT COUPLE OF DAYS.
&&
.SHORT TERM...CROSS GORGE PRESSURE GRADIENTS APPEAR TO BE PEAKING
AROUND 14 MB BETWEEN KPDX AND KDLS THIS MORNING. NAM12 SHOWS THE
GRADIENTS REMAINING STRONG THROUGH THE MORNING...THEN WEAKENING IN
THE AFTERNOON. WILL EXTEND THE HIGH WIND WARNINGS FOR THE GORGE AND E
PORTLAND METRO AREA INTO THE EARLY AFTERNOON. WILL DROP THE WARNING
FOR THE CENTRAL OREGON COAST THOUGH AS GRADIENTS THROUGH THE COAST
RANGE HAVE WEAKENED ALREADY...WITH KEUG-KOTH DROPPING FROM 5 MB TO 3
MB IN THE PAST 8 HOURS. WINDS THAT HAVE SPREAD THROUGH THE N
WILLAMETTE VALLEY HAVE SUFFICIENTLY MIXED THE BOUNDARY LAYER THERE TO
DROP THE AIR STAGNATION ADVISORY. THE AIR COMING IN FROM THE EASTSIDE
HAS DRIED OUT AIR MASS SUFFICIENTLY TO SEVERELY RESTRICT FOG AND LOW
CLOUD DEVELOPMENT...SO WILL NEED TO BACK OFF ON EXTENT OF CLOUDS AND
FOG NEXT COUPLE OF DAYS. EXCEPTION IS E OF CASCADE LOCKS AND IN THE
HOOD RIVER VALLEY WHERE COLD AIR IS DEEPENING...AND LOW CLOUDS ARE
LOCKED IN FOR THE NEXT FEW DAYS. THE DEEPENING COLD AIR ON THE
EASTSIDE AND THE RIDGE SLOWLY SHIFTING E WILL ALSO CONTINUE TO
MODERATE THE WARM AIR OVER THE MOUNTAINS IN THE NEXT TWO DAYS.
&&
.LONG TERM...NO CHANGES. PREVIOUS DISCUSSION FOLLOWS...
EXTENDED MODELS CONTINUE TO SUGGEST A SPLIT FLOW DEVELOPING OVER THE
PACIFIC NORTHWEST DURING THE SECOND HALF OF THE WEEK. ALTHOUGH
UNLIKELY...AN OCCASIONAL RUN SUCH AS 12Z OPERATIONS GFS SEEMS TO WANT
TO PUSH A SYSTEM THROUGH THE LONGWAVE RIDGE...WHICH MAKES IT
DIFFICULT TO TOTALLY RULE OUT ANY CHANCE OF RAIN. WILL HANG ONTO
MINIMAL POPS WED THROUGH FRI. BY THE WEEKEND GFS AND ECMWF SEEM TO
AGREE ON DEVELOPING A WESTERLY FLOW OVER THE NE PAC THAT APPROACHES
THE REGION BY SAT...SO WILL SHOW AN INCREASING CHANCE FOR RAIN THEN.
&&
.AVIATION...STRONG OFFSHORE FLOW PERSISTS TODAY...BUT WILL WEAKEN
OVER THE SOUTH PART OF THE FORECAST AREA AFTER 20Z. INTENSE SURFACE
GRADIENT THROUGH THE GORGE...AT ONE POINT -14.6 MB KTTD-KDLS...
RESULTING IN WIND GUSTS TO NEAR 50 KT AT KTTD. VFR EVERYWHERE EXCEPT
FOR SOME VERY ISOLATED POCKETS OF IFR TO LIFR FOG IN SHELTERED
VALLEYS OF SW WASHINGTON AND S WILLAMETTE VALLEY. VFR WILL CONTINUE
THROUGH THE 18Z TAF FORECAST...ALTHOUGH KEUG LIKELY TO DROP DOWN
INTO LIFR IN SHALLOW FOG AROUND 06Z. KHIO OBS STARTED TO COME IN AT
1453Z SO WILL RESUME TAF FORECAST BY 17Z.
KPDX AND APPROACHES...MAIN STORY IS THE EAST WIND. GUSTS 30 TO 35 KT
AT KPDX TO PERSIST MUCH OF THE DAY. GRADIENT STARTS TO EAST AFTER
21Z. WEISHAAR
&&
.MARINE...OFFSHORE FLOW CONTINUES THROUGH THE FIRST HALF OF THE
WEEK. INTERESTING SURFACE PATTERN EARLY THIS MORNING. SMALL-SCALE
SURFACE LOW OFF THE SOUTH OREGON COAST MIGRATING NORTH THIS MORNING.
THIS LOW HELPED ENHANCE OFFSHORE GRADIENTS ALONG THE SOUTH WATERS
WITH VERY STRONG WIND GUSTS NEAR COASTAL TERRAIN GAPS. GRADIENT WILL
WEAKEN AFTER 18Z. SMALL CRAFT FOR WIND CONTINUES THROUGH
20Z...ALTHOUGH MAY HAVE TO EXTEND IT IN THE NORTH. SEAS STILL
RUNNING ABOUT A FOOT LOWER THAN GUIDANCE AND WILL MAINTAIN 8 FT SEAS
TODAY. CONTINUED LONG PERIOD SWELL WILL PRODUCE ROUGH BAR CONDITIONS
DURING THE EBB CURRENTS. WEISHAAR
&&
.PQR WATCHES/WARNINGS/ADVISORIES...
OR/WA...SMALL CRAFT ADVISORY FOR WIND CAPE SHOALWATER TO FLORENCE
UNTIL NOON.
SMALL CRAFT ADVISORY FOR ROUGH BAR THIS MORNING AND LATE
THIS EVENING.
AIR STAGNATION ADVISORY THROUGH TUE FOR SOME OF THE LOWER
INTERIOR VALLEYS OF NW OREGON AND SW WA.
HIGH WIND WARNING EAST PART OF THE PORTLAND/VANCOUVER AREA
NEAR THE GORGE THROUGH 3 PM TODAY.
HIGH WIND WARNING WESTERN COLUMBIA RIVER GORGE THROUGH 3 PM
TODAY.
&&
$$
MORE WEATHER INFORMATION ONLINE AT...
HTTP://WEATHER.GOV/PORTLAND
THIS DISCUSSION IS FOR NORTHWEST OREGON AND SOUTHWEST WASHINGTON FROM
THE CASCADE CREST TO 60 NAUTICAL MILES OFFSHORE. THE AREA IS COMMONLY
REFERRED TO AS THE FORECAST AREA.
000
FXUS66 KPQR 181031
AFDPQR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
230 AM PST SUN JAN 18 2009
.SYNOPSIS...STRONG HIGH PRESSURE ALOFT OVER THE PACIFIC NORTHWEST AND
EAST OF THE CASCADES WILL PERSIST INTO EARLY NEXT WEEK. THE STRONG
SURFACE HIGH EAST OF THE CASCADES WILL VERY SLOWLY WEAKEN EARLY NEXT
WEEK...WITH STRONG WINDS THROUGH THE GORGE EASING A BIT MONDAY AND
EASING MORE TUESDAY AND WEDNESDAY. THE STRONG OFFSHORE FLOW
DECREASED THE AREAL COVERAGE OF VALLEY FOG AND WILL FOR THE NEXT
COUPLE OF DAYS...BUT THE FOG WILL LIKELY INCREASE AGAIN TUESDAY AND
WEDNESDAY AS WINDS DECREASE. THE DRY OFFSHORE FLOW IN THE HIGHER
TERRAIN AND ALONG THE COAST IS CAUSING UNSEASONABLY WARM AND DRY
CONDITIONS THAT WILL ALSO CONTINUE INTO EARLY NEXT WEEK.
MEANWHILE...THE CENTRAL AND SOUTHERN WILLAMETTE VALLEY WILL LIKELY
REMAIN UNDER A STRONG INVERSION...WITH MUCH COOLER TEMPERATURES.
&&
.SHORT TERM...LOCAL SURFACE ANALYSES SHOW TIGHT PRESSURE GRADIENTS
BETWEEN A SURFACE HIGH PRESSURE EAST OF THE CASCADES AND A LOW
PRESSURE AREA JUST OFF THE OREGON COAST. THE GRADIENT FROM ASTORIA TO
THE DALLES IS 18.1 MILLIBARS AT 2 AM AND PORTLAND TO THE DALLES IS
14.6 MILLIBARS...ALSO NORTH BEND TO REDMOND IS OVER 16 MILLIBARS.
THIS IS CAUSING STRONG OFFSHORE FLOW WITH STRONG WINDS OUT THE WEST
END OF THE COLUMBIA GORGE AND ACROSS THE NORTH WILLAMETTE VALLEY AND
STRONG EAST WINDS ALSO SHOWING UP AT THE COAST. CAPE FOULWEATHER AT
THE CENTRAL COAST HAS SHOWN OVER 40 MPH EAST WINDS WITH GUSTS IN THE
50S AND THAT IS SUPPORTED BY WINDS AROUND IT THAT ARE NOT QUITE AS
STRONG. OBSERVATIONS AT CORBETT ARE MISSING NOW BUT THEY GUSTED TO 71
BEFORE REPORTS STOPPED. THE GUSTY WINDS BROUGHT REPORTS OF TREE
DAMAGE AND POWER OUTAGES IN THE NORTH WILLAMETTE VALLEY AND WRF MODEL
CROSS SECTIONS MAINTAIN A STRONG FLOW INTO THE MORNING. HIGH WIND
WARNINGS ARE NOW IN EFFECT AT THE CENTRAL COAST ABOVE 500 FEET AND IN
THE NORTH WILLAMETTE VALLEY AND THE WEST COLUMBIA GORGE. THE PRESSURE
GRADIENT SHOULD EASE SLIGHTLY THROUGH THE GORGE THIS AFTERNOON AND TO
NIGHT...TO END WARNINGS BUT THIS COULD STILL PRODUCE WIND ADVISORY
GUSTS NEAR THE GORGE. THE GRADIENT EASES MORE MONDAY AFTERNOON AND
TUESDAY AND SHOULD GET BELOW ANY HIGHLIGHTS AT THAT POINT.
THE WIND DRIED OUT DEWPOINTS IN THE VALLEY AND FOG IS MORE PATCHY
THIS MORNING. FOG SHOULD SLOWLY BEGIN TO INCREASE IN AREA AS WINDS
DECREASE TUESDAY MORNING AND DEVELOP A BIT EARLIER THE NEXT FEW
NIGHTS AFTER THAT. ALL OF THIS BEING DRIVEN BY THE UPPER LEVEL RIDGE
THAT WILL SLOWLY EASE OFF TO THE EAST TODAY AND MONDAY. THE NEXT
PACIFIC WEATHER SYSTEM FALLS APART AS IT APPROACHES THE COAST
WEDNESDAY. SUSPECT THE ECMWF IS BETTER THAN THE GFS ON THE COUPLE OF
SYSTEMS WEAKENING AND SPLITTING NEXT WEEK. WILLSON
&&
.LONG TERM...NO CHANGES. PREVIOUS DISCUSSION FOLLOWS...
EXTENDED MODELS CONTINUE TO SUGGEST A SPLIT FLOW DEVELOPING OVER THE
PACIFIC NORTHWEST DURING THE SECOND HALF OF THE WEEK. ALTHOUGH
UNLIKELY...AN OCCASIONAL RUN SUCH AS 12Z OPERATIONS GFS SEEMS TO WANT
TO PUSH A SYSTEM THROUGH THE LONGWAVE RIDGE...WHICH MAKES IT
DIFFICULT TO TOTALLY RULE OUT ANY CHANCE OF RAIN. WILL HANG ONTO
MINIMAL POPS WED THROUGH FRI. BY THE WEEKEND GFS AND ECMWF SEEM TO
AGREE ON DEVELOPING A WESTERLY FLOW OVER THE NE PAC THAT APPROACHES
THE REGION BY SAT...SO WILL SHOW AN INCREASING CHANCE FOR RAIN THEN.
&&
.AVIATION...STRONG OFFSHORE FLOW ACROSS THE AREA TODAY. MODELS
INDICATE OFFSHORE PRESSURE GRADIENTS - HENCE EAST WINDS - THROUGH
THE GORGE AND ACROSS THE COAST RANGE AT THEIR PEAK THROUGH THIS
AFTERNOON...THEN SLOWLY EASING THROUGH MONDAY. AIR MASS CONTINUES
TO DRY AT LOW LEVELS. THE SOUTH WILLAMETTE VALLEY AND LOWER COLUMBIA
NEAR KKLS CONTINUE UNDER EVER DECREASING FOG COVERAGE. NIL TAF AT
KHIO CONTINUES DUE TO COMMS ISSUES...HOPEFULLY DATA WILL BE RESTORED
SUNDAY.
KPDX AND APPROACHES...EAST WIND CONTINUING TODAY WITH GUSTS 35 TO 40
KT AT KPDX THIS MORNING...AND WILL SUBSIDE FOR THE AFTERNOON.
APPROACHES TO THE WEST WILL STILL HAVE A THREAT OF LIFR DUE TO
FOG...BUT AREAL COVERAGE LIKELY TO BE RATHER SPOTTY. VERY STRONG
EAST WIND WILL CONTINUE NEAR APPROACHES TO THE EAST.
&&
.MARINE...OFFSHORE FLOW CONTINUES THROUGH THE FIRST HALF OF THE
WEEK. SMALL CRAFT FOR WIND THROUGH THIS MORNING DUE TO GAP WINDS
WITH GUSTS TO 30 KT. SEAS 9 FT OVERNIGHT AND SUN. LONG PERIOD SWELL
WILL RESULT IN ROUGH COLUMBIA RIVER BAR CONDITIONS THIS MORNING AND
LATER THIS EVENING.
&&
.PQR WATCHES/WARNINGS/ADVISORIES...
OR/WA...SMALL CRAFT ADVISORY FOR WIND CAPE SHOALWATER TO
FLORENCE THROUGH THIS MORNING.
SMALL CRAFT ADVISORY FOR ROUGH BAR SUNDAY
MORNING AND EVENING.
AIR STAGNATION ADVISORY THROUGH TUE FOR THE LOWER INTERIOR
VALLEYS OF NW OREGON AND SW WA.
HIGH WIND WARNING NORTHEAST PART OF THE NORTH WILLAMETTE
VALLEY ESPECIALLY THE GREATER PORTLAND/VANCOUVER AREA NEAR
THE GORGE THROUGH NOON TODAY.
HIGH WIND WARNING WESTERN COLUMBIA RIVER GORGE THROUGH NOON
TODAY.
HIGH WIND WARNING CENTRAL OREGON COAST ABOVE 500 FEET THROUGH
NOON TODAY.
&&
$$
MORE WEATHER INFORMATION ONLINE AT...
http://weather.gov/portland
THIS DISCUSSION IS FOR NORTHWEST OREGON AND SOUTHWEST WASHINGTON FROM
THE CASCADE CREST TO 60 NAUTICAL MILES OFFSHORE. THE AREA IS COMMONLY
REFERRED TO AS THE FORECAST AREA.
000
FXUS66 KPQR 180442
AFDPQR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
841 PM PST SAT JAN 17 2009
.SYNOPSIS...STRONG HIGH PRESSURE ALOFT OVER THE PACIFIC NORTHWEST AND
EAST OF THE CASCADES WILL PERSIST INTO EARLY NEXT WEEK. THE STRONG
SURFACE HIGH EAST OF THE CASCADES WILL VERY SLOWLY WEAKEN EARLY NEXT
WEEK...WITH STRONG WINDS THROUGH THE GORGE EASING A BIT MONDAY AND
EASING MORE TUESDAY AND WEDNESDAY. THE STRONG OFFSHORE FLOW WAS
DECREASING THE AREAL COVERAGE OF VALLEY FOG THE NEXT COUPLE OF
DAYS...BUT THE FOG WILL LIKELY INCREASE AGAIN TUESDAY AND WEDNESDAY.
THE DRY OFFSHORE FLOW IN THE HIGHER TERRAIN AND ALONG THE COAST IS
CAUSING UNSEASONABLY WARM AND DRY CONDITIONS THAT WILL ALSO CONTINUE
INTO EARLY NEXT WEEK. MEANWHILE...THE CENTRAL AND SOUTHERN WILLAMETTE
VALLEY WILL LIKELY REMAIN UNDER A STRONG INVERSION...WITH MUCH COOLER
TEMPERATURES.
&&
.SHORT TERM...GRADIENTS THROUGH THE GORGE HAVE BEEN HOLDING STEADY
AROUND 12 MB THIS AFTERNOON AND EVENING...AND TROUTDALE AIRPORT HAS
HAD A PEAK WIND GUSTS 55 MPH. CORBETT REACHED 71 MPH BEFORE IT
STOPPED REPORTING...WITH ROOSTER ROCK TO 64 MPH. WITH REPORTS OF SOME
TREE DAMAGE IN THE GRESHAM AREA...AND THE NAM MODEL SHOWING GRADIENTS
OF 12 TO 13 MB OVERNIGHT AND INTO EARLY SUNDAY...DECIDED TO UPGRADE
TO A HIGH WIND WARNING IMMEDIATELY ADJACENT TO GORGE IN THE PORTLAND
AND VANCOUVER METRO AREAS. THE GRADIENT THEN EASES SLIGHTLY TO ABOUT
10 MB THROUGH THE GORGE SUNDAY AFTERNOON AND SUNDAY NIGHT... AND THIS
COULD STILL PRODUCE WIND ADVISORY GUSTS NEAR THE GORGE. THE GRADIENT
EASES MORE MONDAY AFTERNOON AND TUESDAY AND SHOULD GET BELOW ANY
HIGHLIGHTS AT THAT POINT.
THE WIND DRIED OUT THE FOG EVEN IN THE SOUTH VALLEY THIS AFTERNOON
AND EVENING...BUT DEW POINT SPREAD WERE NOT TOO GREAT IN THE SOUTH SO
EXPECT FOG TO RETURN RATHER QUICKLY THERE THIS EVENING. IN FACT
EUGENE AIRPORT INDICATED FOG HAD RETURNED AS OF 8 PM. DEW POINTS ARE
A LOT LOWER IN THE CENTRAL VALLEY...BUT EXPECT FOG TO EVENTUALLY
REACH THERE OVERNIGHT...PROBABLY RATHER LATE. THE PORTLAND AND
VANCOUVER AREA WILL HAVE A TOUGHER TIME...THOUGH SOME PATCHY FOG
COULD DEVELOP OUT NEAR HILLSBORO AND NORTH OF BATTLE GROUND. WE ARE
ALSO SEEING SOME LOW CLOUDS AND FOG WORKING ITS WAY DOWN INTERSTATE 5
THROUGH CASTLE ROCK TOWARD KELSO. WITH THE STRONG OFFSHORE FLOW ON
SUNDAY CONTINUING...EXPECT A SIMILAR CLEARING PATTERN. FOG SHOULD
SLOWLY BEGIN TO INCREASE IN AREA AND DEVELOP A BIT EARLY THE NEXT FEW
NIGHTS AFTER THAT.
ALL OF THIS BEING DRIVEN BY THE UPPER RIDGE THAT SLOWLY EASE EAST
SUNDAY AND MONDAY. THE NEXT SYSTEM FALLS APART AS IT APPROACHES THE
COAST WEDNESDAY. SUSPECT THE ECMWF IS BETTER ON THE COUPLE OF SYSTEMS
WEAKENING AND SPLITTING NEXT WEEK THAN THE GFS. TOLLESON
&&
.LONG TERM...NO CHANGES. PREVIOUS DISCUSSION FOLLOWS...
EXTENDED MODELS CONTINUE TO SUGGEST A SPLIT FLOW DEVELOPING OVER THE
PACIFIC NORTHWEST DURING THE SECOND HALF OF THE WEEK. ALTHOUGH
UNLIKELY...AN OCCASIONAL RUN SUCH AS 12Z OPERATIONS GFS SEEMS TO WANT
TO PUSH A SYSTEM THROUGH THE LONGWAVE RIDGE...WHICH MAKES IT
DIFFICULT TO TOTALLY RULE OUT ANY CHANCE OF RAIN. WILL HANG ONTO
MINIMAL POPS WED THROUGH FRI. BY THE WEEKEND GFS AND ECMWF SEEM TO
AGREE ON DEVELOPING A WESTERLY FLOW OVER THE NE PAC THAT APPROACHES
THE REGION BY SAT...SO WILL SHOW AN INCREASING CHANCE FOR RAIN THEN.
&&
.AVIATION...MODELS INDICATE PRESSURE GRADIENTS THROUGH THE GORGE AT
THEIR PEAK TONIGHT THROUGH SUN AFTERNOON...THEN SLOWLY EASING THROUGH
MONDAY. EXPECT STRONG EAST WIND NEAR GORGE (KPDX AND KTTD) THROUGH
20Z MON, BUT OTHERWISE VFR THOSE SITES. EXPECT LIFR CONDITIONS TO
RETURN TO CENTRAL AND SOUTH WILLAMETTE VALLEY TONIGHT. NIL TAF AT
KHIO CONTINUES OVERNIGHT DUE TO COMMS ISSUES...HOPEFULLY DATA WILL BE
RESTORED SUNDAY.
KPDX AND APPROACHES...EAST WIND SHOULD CONTINUE THROUGH SUN WITH
GUSTS 25 TO 35 KT ELIMINATING THREAT OF FOG. APPROACHES TO THE WEST
WILL STILL HAVE A THREAT OF LIFR DUE TO FOG...BUT AREAL COVERAGE
LIKELY TO BE RATHER SPOTTY. VERY STRONG EAST WIND WILL CONTINUE NEAR
APPROACHES TO THE EAST.
&&
.MARINE...OFFSHORE FLOW CONTINUES THROUGH THE WEEKEND. SMALL CRAFT
FOR WIND THIS EVENING CONTINUES THROUGH SUN MORNING IN THE N WATERS
DUE TO GAP WINDS WITH GUSTS TO 25 KT. SEAS 9 FT OVERNIGHT AND SUN.
LONG PERIOD SWELL WILL RESULT IN ROUGH COLUMBIA RIVER BAR CONDITIONS
THIS EVENING AND SUN MORNING...THOUGH BREAKERS ARE NOT EXPECTED.
&&
.PQR WATCHES/WARNINGS/ADVISORIES...
OR/WA...SMALL CRAFT ADVISORY FOR WIND CAPE SHOALWATER TO CASCADE HEAD
THIS EVENING THROUGH SUN MORNING.
SMALL CRAFT ADVISORY FOR ROUGH BAR THIS EVENING AND SUNDAY
MORNING.
AIR STAGNATION ADVISORY THROUGH TUE FOR THE LOWER INTERIOR
VALLEYS OF NW OREGON AND SW WA.
HIGH WIND WARNING GREATER PORTLAND/VANCOUVER AREA NEAR THE
GORGE THROUGH NOON SUNDAY.
HIGH WIND WARNING WESTERN COLUMBIA RIVER GORGE THROUGH NOON
SUNDAY.
&&
$$
MORE WEATHER INFORMATION ONLINE AT...
HTTP://WEATHER.GOV/PORTLAND
THIS DISCUSSION IS FOR NORTHWEST OREGON AND SOUTHWEST WASHINGTON FROM
THE CASCADE CREST TO 60 NAUTICAL MILES OFFSHORE. THE AREA IS COMMONLY
REFERRED TO AS THE FORECAST AREA.
000
FXUS66 KPQR 172243
AFDPQR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
242 PM PST SAT JAN 17 2009
.SYNOPSIS...STRONG HIGH PRESSURE ALOFT AND AT THE SURFACE WILL
PERSIST INTO EARLY NEXT WEEK. OFFSHORE FLOW ALSO CONTINUES...WITH THE
MAIN EFFECTS BEING GUSTY WINDS THROUGH THE COLUMBIA GORGE AND DRYING
OF THE AIR MASS. THE DRY OFFSHORE FLOW IN THE HIGHER TERRAIN AND
ALONG THE COAST IS CAUSING UNSEASONABLY WARM AND DRY CONDITIONS THAT
WILL CONTINUE INTO EARLY NEXT WEEK. MEANWHILE...THE CENTRAL AND
SOUTHERN WILLAMETTE VALLEY WILL LIKELY REMAIN UNDER A STRONG
INVERSION...WITH MUCH COOLER TEMPERATURES.
&&
.SHORT TERM...MODELS CONTINUE WITH THE SAME BASIC FORECAST THROUGH
THE NEXT FEW DAYS...THE UPPER RIDGE BEGINNING TO MOVE SLOWLY E SUN...
WHILE SURFACE HIGH PRESSURE E OF THE CASCADES MAINTAINS A
STRONG...BUT EVENTUALLY WEAKENING OFFSHORE FLOW THROUGH THE GORGE.
ISSUED A HIGH WIND WARNING FOR THE W END OF THE GORGE EARLIER
TODAY...AS WELL AS A WIND ADVISORY OVER THE E PORTLAND METRO AREA
THROUGH TONIGHT AND INTO SUN MORNING. CROSS CASCADE PRESSURE
GRADIENTS HAVE CONTINUED TO SLOWLY STRENGTHEN TODAY...AND NAM
CONTINUES TO SHOW GRADIENTS PEAKING TONIGHT...SO NO REASON TO EXPECT
WINDS TO DIE DOWN FROM PRESENT LEVELS UNTIL LATER IN THE DAY SUNDAY.
THE LOW LEVEL SUBSIDENCE INVERSION IS EXPECTED TO REMAIN BELOW PASS
LEVELS...WHICH SUGGESTS THAT THE HIGH WINDS SHOULD REMAIN RESTRICTED
TO THE COLUMBIA GORGE AND WOULD NOT BE ABLE TO PUSH THROUGH ANY OF
THE HIGHER PASSES.
AS THE UPPER RIDGE SHIFTS E MON AND TUE...SHOULD SEE A GRADUAL
WEAKENING OF THE INVERSION. EXPECT THIS TO RESULT IN SLOWLY COOLING
TEMPS IN THE MOUNTAINS ABOVE THE INVERSION. LOWER ELEVATIONS THOUGH
SHOULD REMAIN COOL...ALTHOUGH THE INFILTRATION OF DRIER AIR FROM THE
EASTSIDE IS SLOWLY PUSHING BACK THE EXTENT OF THE LOW CLOUDS AND FOG.
EAST OF CASCADE LOCKS THOUGH LOW CLOUDS SHOULD REMAIN LOCKED IN FOR
SEVERAL MORE DAYS UNTIL INVERSION BREAKS. ALTHOUGH THE HEIGHT OF THE
INVERSION IS UP TO AROUND 2000 FT ON THE 12Z SLE SOUNDING...AND A
LIGHT NORTH BREEZE HAS DEVELOPED IN THE WILLAMETTE VALLEY TODAY...DO
NOT SEE ANY WHOLESALE MIXING OF THE LOWER ATMOSPHERE THROUGH TUE...SO
WILL HANG ONTO THE AIR STAGNATION ADVISORY THROUGH THEN.
&&
.LONG TERM...EXTENDED MODELS CONTINUE TO SUGGEST A SPLIT FLOW
DEVELOPING OVER THE PACIFIC NORTHWEST DURING THE SECOND HALF OF THE
WEEK. ALTHOUGH UNLIKELY...AN OCCASIONAL RUN SUCH AS 12Z OPERATIONS
GFS SEEMS TO WANT TO PUSH A SYSTEM THROUGH THE LONGWAVE RIDGE...WHICH
MAKES IT DIFFICULT TO TOTALLY RULE OUT ANY CHANCE OF RAIN. WILL HANG
ONTO MINIMAL POPS WED THROUGH FRI. BY THE WEEKEND GFS AND ECMWF SEEM
TO AGREE ON DEVELOPING A WESTERLY FLOW OVER THE NE PAC THAT
APPROACHES THE REGION BY SAT...SO WILL SHOW AN INCREASING CHANCE FOR
RAIN THEN.
&&
.AVIATION...OFFSHORE SURFACE GRADIENT CONTINUING TO INCREASE AS COLD
AIR DEEPENS EAST OF THE CASCADES. AT 21Z KTTD-KDLS GRADIENT -12.4
MB. THIS HAS RESULTED IN BETTER PENETRATION OF DRIER AIR INTO THE
WILLAMETTE VALLEY. MUCH LESS FOG AND STRATUS TODAY COMPARED TO
YESTERDAY. ALL SITES VFR THIS AFTERNOON. EXPECT LIFR CONDITIONS TO
RETURN TO CENTRAL AND SOUTH WILLAMETTE VALLEY THIS EVENING AND
TONIGHT. NIL TAF AT KHIO CONTINUES BUT TECHNICIANS WORKING ON THE
PROBLEM AND HOPEFULLY DATA WILL BE RESTORED LATER TODAY.
KPDX AND APPROACHES...THE LIGHT ONSHORE GRADIENT KPDX-KTTD FINALLY
DROPPED TO 0.0 MB AT 21Z. WIND ABRUPTLY SWITCHED FROM LIGHT NW TO SE
AT 15 TO 20 KT. WIND SHOULD CONTINUE THROUGH SUN ELIMINATING ANY
THREAT OF FOG. APPROACHES TO THE WEST WILL STILL HAVE A THREAT OF
LIFR DUE TO FOG...BUT IF IT OCCURS AREAL COVERAGE WILL BE RATHER
SPOTTY. VERY STRONG EAST WIND WILL CONTINUE NEAR APPROACHES TO THE
EAST. WEISHAAR
&&
.MARINE...OFFSHORE FLOW CONTINUES THROUGH THE WEEKEND. BOUNDARY
LAYER MODEL PROGS SUGGEST OFFSHORE FLOW WILL BE A LITTLE STRONGER
TONIGHT. DECIDED TO GO AHEAD AND PUT UP A SMALL CRAFT FOR WIND THIS
EVENING THROUGH SUN MORNING IN THE N WATERS. EXPECT FREQUENT GUSTS
TO 25 KT NEAR THE COASTAL TERRAIN GAPS. WAVE WATCH MODEL CONTINUES
TO RUN ABOUT A FOOT TOO HIGH. LOOKS LIKE SEAS WILL EASE UP TO 9 FT
OVERNIGHT AND HOVER THERE THROUGH SUN. LONG PERIOD SWELL WILL RESULT
IN ROUGH COLUMBIA RIVER BAR CONDITIONS THIS EVENING AND SUN
MORNING...THOUGH BREAKERS ARE NOT EXPECTED. WEISHAAR
&&
.PQR WATCHES/WARNINGS/ADVISORIES...
OR/WA...SMALL CRAFT ADVISORY FOR WIND CAPE SHOALWATER TO CASCADE HEAD
THIS EVENING THROUGH SUN MORNING.
SMALL CRAFT ADVISORY FOR ROUGH BAR THIS EVENING AND SUNDAY
MORNING.
AIR STAGNATION ADVISORY THROUGH TUE FOR THE LOWER INTERIOR
VALLEYS OF NW OREGON AND SW WA.
WIND ADVISORY NORTH WILLAMETTE VALLEY EAST OF PORTLAND
NEAR THE COLUMBIA GORGE THROUGH NOON SUNDAY.
HIGH WIND WARNING WESTERN COLUMBIA RIVER GORGE THROUGH NOON
SUNDAY.
&&
$$
MORE WEATHER INFORMATION ONLINE AT...
HTTP://WEATHER.GOV/PORTLAND
THIS DISCUSSION IS FOR NORTHWEST OREGON AND SOUTHWEST WASHINGTON FROM
THE CASCADE CREST TO 60 NAUTICAL MILES OFFSHORE. THE AREA IS COMMONLY
REFERRED TO AS THE FORECAST AREA.
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