000
FXUS65 KVEF 250957
AFDVEF

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
300 AM PDT THU SEP 25 2008

.SYNOPSIS...MOSTLY CLEAR SKIES WITH ABOVE NORMAL TEMPERATURES WILL
CONTINUE OVER THE AREA TODAY AND FRIDAY. AN INCREASE IN MOISTURE ON
SATURDAY WILL ALLOW FOR A SLIGHT CHANCE OF AFTERNOON THUNDERSTORMS
MAINLY ACROSS NORTHWEST ARIZONA.
&&

.SHORT TERM...HIGH PRESSURE OVER THE DESERT SOUTHWEST WILL CONTINUE
TO KEEP MOSTLY CLEAR SKIES ACROSS THE CWA TODAY. HOWEVER A TROUGH
MOVING THROUGH THE PACNW WILL PUSH THE RIDGE CENTER FURTHER EAST
ALLOWING FOR MORE SOUTH TO SOUTHEAST FLOW ALOFT TO FORM BY THIS
AFTERNOON. THIS SOUTHERLY FLOW TO CONTINUE INTO FRIDAY AND SATURDAY
AS A WEAK LOW FORMS OFF THE SOUTHERN CALIFORNIA COAST. THIS WILL
RESULT IN A SLIGHT INCREASE IN MOISTURE BOTH FRIDAY AND SATURDAY...
RESULTING IN AN INCREASE IN AFTERNOON CLOUDS ESPECIALLY OVER THE
MOUNTAINS BOTH DAYS. STABILITY SLOWLY DECREASES WITH LI VALUES
DROPPING TO NEAR ZERO ACROSS MAINLY MOHAVE COUNTY AND THE SOUTHERN
SIERRA ON SATURDAY AFTERNOON WHICH COMBINED WITH THE MOISTURE
INCREASE...PW VALUES NEARLY 1 INCH ACROSS MOHAVE COUNTY BY 00Z
SUN...HAVE INTRODUCED SLIGHT CHANCE OF AFTERNOON TSTORMS FOR THE
SOUTHERN SIERRA/NORTHWEST ARIZONA. TEMPERATURES TO REMAIN ABOVE
NORMAL THROUGH THE SHORT TERM. TROUGH PASSAGE TO THE NORTH TODAY TO
INCREASE GRADIENTS SLIGHTLY SO LOOK FOR A SLIGHT INCREASE IN WINDS
THIS AFTERNOON...WHICH WILL HELP RAISE TEMPS A FEW DEGREES FROM
WEDNESDAY...THUS MOST READINGS LIKELY 5-8 DEGREES ABOVE NORMAL
ACROSS THE CWA TODAY.

.LONG TERM...MODELS REMAIN IN GOOD AGREEMENT THROUGH THE EXTENDED
PERIOD AS HIGH PRESSURE HOLDS OVER THE GREAT BASIN AND INTERMOUNTAIN
WEST. WEAK LOW PRESSURE OFF THE CA COAST IS EXPECTED TO CONTINUE TO
WEAKEN...BUT ENOUGH MOISTURE COULD BE PULLED NORTHWARD TO BRING A
SLIGHT CHANCE OF SHOWERS TO THE EASTERN SIERRA MONDAY AS BETTER
DYNAMICS AND LIFT COME INTO PLAY. HAVE INCREASED POPS SLIGHTLY OVER
THE EASTERN SIERRA ZONE AND LEFT OTHER AREAS UNCHANGED. BY
TUESDAY...HIGH PRESSURE REMAINS FIRMLY IN PLACE...BUT A STRONG AREA
OF LOW PRESSURE APPROACHING THE PACIFIC NORTHWEST IS FORECAST TO
EVENTUALLY BREAK THE HIGH DOWN AND BRING A DEFINITE CHANGE TO THE
WEATHER PATTERN BY LATE WEDNESDAY AND THURSDAY. COOLER
TEMPERATURES...INCREASED WINDS...AND A CHANCE OF SHOWERS OVER MUCH
OF THE CWA WOULD BE POSSIBLE. TEMPERATURES ARE EXPECTED TO REMAIN
ABOVE NORMAL THROUGH WEDNESDAY...BUT FALL TO SLIGHTLY BELOW NORMAL
BY THURSDAY.
&&

.AVIATION...FOR MCCARRAN...NO SIGNIFICANT WEATHER EXPECTED OVER THE
NEXT COUPLE OF DAYS WITH GENERALLY LIGHT EAST WINDS DURING THE DAY
AND SOUTHWEST WINDS AT NIGHT. SOME INCREASE IN CLOUD COVER IS
EXPECTED TODAY AS MOISTURE INCREASES FROM THE SOUTHEAST.

FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA...A GENERAL INCREASE IN CLOUD COVER OVER THE NEXT COUPLE
OF DAYS BUT NO SIGNIFICANT WEATHER EXPECTED ACROSS THE REGION. WINDS
TO REMAIN GENERALLY LIGHT ACROSS THE SOUTHERN REGIONS WITH GUSTY
WINDS TO 25KTS DEVELOPING THIS AFTERNOON ACROSS THE NORTH.
&&

JENSEN/GORELOW

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