PACJET Projects |
HMT 2004
PACJET 2003
PACJET 2002
PACJET 2001
CALJET 1998
|
PACJET 2001 IOPs |
IOP 1: 20 Jan 2001
IOP 2: 23 Jan 2001
IOP 3: 25 Jan 2001
IOP 4: 31 Jan 2001
IOP 5: 1 Feb 2001
IOP 6: 6 Feb 2001
IOP 7: 9 Feb 2001
IOP 8: 10 Feb 2001
IOP 9: 11 Feb 2001
IOP 10: 12 Feb 2001
IOP 11: 17 Feb 2001
IOP 12: 18 Feb 2001
IOP 13: 21 Feb 2001
IOP 14: 24 Feb 2001
IOP 15: 25 Feb 2001
IOP 16: 1 Mar 2001
|
Background |
About Pacjet
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Data Assimilation Implementation Plan
March 2001 Program Status Report
PACJET 2001 Poster
NSSL Briefing
|
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Overview Poster
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|
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Related Experiments |
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Workshops |
2001 - Monterey, CA
July 13-14 2000 (Boulder, CO)
July Workshop Agenda
September 1999 - Monterey, CA
1999 Planning Workshop Figures
June 1998 - CALJET
|
|
Program Status for 17 February 2001: IOP 11
Status |
Observations |
Forecast Discussion |
Flight Plan |
Aircraft Status |
Soundings Status
Status |
Saturday, February 17 |
P-3 flight, 1430 UTC take off.
|
Sunday, February 18 |
1600 PST flight.
Weather briefing at 1000 PST.
|
Monday, February 19 |
Possible P-3 flight.
|
Status |
Observations |
Forecast Discussion |
Flight Plan |
Aircraft Status |
Soundings Status
Observations |
2327 UTC
|
At 35.49N, 123.04, 946 mb:
heading: 43deg , have descended to alt= 2000 ft
winds:195deg, 13kt
air temp: 9.1degC ,dewpt temp: 7.9degC
|
2253 UTC
|
Sounding from 35.3N, 122.0W
Press(mb) ht(m) T(degC) Td(degC) ff(kt) dd(deg)
1002.1 -SFC 12.0 10.5 - -
1000 173 11.0 9.1 23 155
925 821 7.6 6.0 22 180
850 1514 4.0 2.4 21 190
700 3070 -3.7 -8.7 32 195
500 5564 -20.3 -23.0 42 215
|
2243 UTC
|
at 34.43N, 121.91W, 465mb:
heading: 348deg at 20000ft
winds: 203deg, 41kt
air temp: -22.5degC, dewpt temp: -26.2degC
|
2242 UTC
|
Sounding from 34.4N, 122.0W
Press(mb) ht(m) T(degC) Td(degC) ff(kt) dd(deg)
1001.7 -SFC 12.8 11.1 21 145
1000 145 11.6 10.5 25 150
925 794 8.4 6.5 23 180
850 1488 3.6 2.7 24 195
700 3048 -2.7 -8.5 31 185
500 5562 -19.9 -22.1 45 205
|
2230 UTC
|
Sounding from 33.9N, 123.2W
Press(mb) ht(m) T(degC) Td(degC) ff(kt) dd(deg)
1001.7 -SFC 11.0 9.0 5 205
1000 141 10.2 7.9 6 225
925 786 7.6 2.6 22 270
850 1478 2.4 -0.2 21 250
700 3030 -3.9 -5.2 33 180
500 5561 -20.3 -22.3 39 190
|
2212 UTC
|
Sounding from 33.4N, 124.5W
Press(mb) ht(m) T(degC) Td(degC) ff(kt) dd(deg)
1001.6 -SFC 11.8 8.3 14 175
1000 135 10.6 7.8 15 175
925 781 7.0 3.9 14 255
850 1472 3.0 -2.4 12 270
700 3020 -5.3 -8.7 18 210
500 5559 -20.7 -24.1 48 195
|
2128 UTC
|
Sounding from 35deg30minN, 123degW
Press(mb) ht(m) T(degC) Td(degC) ff(kt) dd(deg)
1001.6 -SFC 10.6 9.0 3 150
1000 132 10.4 8.5 8 235
925 778 7.8 7.6 14 185
850 1472 4.2 4.0 30 185
700 3026 -4.3 -4.9 33 190
500 5560 -21.1 -23.6 40 200
|
2121 UTC
|
Sounding from 34deg54minN, 123degW
Press(mb) ht(m) T(degC) Td(degC) ff(kt) dd(deg)
1001.7 -SFC 10.8 9.2 9 270
1000 137 10.0 8.5 13 265
925 783 7.6 6.7 12 175
850 1477 4.4 3.4 25 180
700 3034 -4.1 -5.5 33 200
500 5561 -20.5 -23.6 40 200
|
2116 UTC
|
Drop#2 made at 34.3N, 123W
from 465mb (20000 ft) at 2115 UTC.
Heading for drop#3 at 35N, 123W
Drop#4 will be at 35.5N, 123W
Cutting through what looks to be the
storm triple point.
|
2115 UTC
|
Sounding from 34deg24minN, 123degW
Press(mb) ht(m) T(degC) Td(degC) ff(kt) dd(deg)
1001.7 -SFC 11.0 10.3 9 315
1000 141 10.0 9.3 10 295
925 789 8.2 8.0 17 180
850 1484 4.4 3.6 22 195
700 3041 -3.7 -4.9 30 195
500 5562 -19.5 -25.2 41 205
|
2109 UTC
|
at 34.3N, 123.1W, 465mb:
heading to pt at 34.3N, 123W to make drop.
winds: 209deg, 50kt
air temp: -23.9degC, dewpt temp: -26.3degC
|
2101 UTC
|
Sounding from 34deg24minN, 124degW
Press(mb) ht(m) T(degC) Td(degC) ff(kt) dd(deg)
1001.6 -SFC 11.2 8.6
1000 135 10.2 7.7 11 150
925 781 6.8 2.1 13 240
850 1473 5.8 -0.2 24 215
700 3024 -5.7 -7.5 31 220
500 5590 -20.3 -23.8 57 205
|
2056 UTC
|
At 34.4N, 124.4W, 465mb:
heading: 126deg at 20000 ft
winds: 201deg, 54kt
air temp: -24.3degC, dewpt temp: -27.4degC
Have climbed to 20000 ft to make drops.
|
2040 UTC
|
Sounding from 34deg21minN, 124deg58minW
Press(mb) T(degC) Td(degC) ff(kt) dd(deg)
925 7.6 - 17 220
850 3.7 -4.5 20 246
700 -4.1 -17.4 27 224
500 -20.5 -23.2 51 190
|
2040 UTC
|
Flying a "figure 4" around precip band
centered on 34.5N, 123.5W, close to
developing low. Will get some dropsondes
into system.
|
2036 UTC
|
Doppler Radar on P-3 showing band of
50 dBz max w/ tops at 6 km (20k ft).
This band is embedded in the lighter precip is
about 60 miles wide. Low level jet info below.
The south of Santa Cruz and Santa Cruz mntns
will probably be most impacted by LLJ.
LLJ:
45kt at 180deg at 2000ft, mix rat.= 8g/kg
at 925 mb; 41kt, 191deg, air temp: 8.5degC, dewpt t: 8.5degC
at 900 mb; 40kt, 189deg, air temp: 7.2degC, dewpt t: 7.1degC
|
2000 - 1700 UTC
|
Here are s-band images during the cold rain. I think we had a frontal
occlusion passage near 1830Z, after which the melting level has come
down >300 m, the precip decreased in intensity briefly, the cloud layer
briefly became more shallow, and the winds briefly decreased. During
the last few minutes, the winds are picking up again, the rain is
heavier, and the sfc temp continues to rise (i.e., static
destabilization given decrease in melting level aloft). I suspect the
warm rain is done for awhile,. In any event, the hour ending 19Z we had
0.36, and the hour ending 20Z had about .2 - .25" (haven't added it up
yet).
|
1941 UTC
|
|
1905 UTC
|
|
1857 UTC
|
|
1851 UTC
|
at 38.34N, 123.62W, 980mb:
heading: 233deg at 1000 ft
winds: 175deg, 23kt
air temp: 9.6degC, dewpt temp: 8.1degC
Planning to head south to
sample rainband offshore in vicinity of
Big Sur coast.
|
1806 UTC
|
LLJ:
at 38.38N, 123.21W
winds: 165deg, 53kt at 930mb (~2200 ft)
mixing ratio: 7g/kg, air temp: 7.0degC
|
1750 UTC
|
|
1739 UTC
|
at 38.74N, 123.57W, 988 mb
heading: 142deg at 700 ft
winds: 141deg, 42kt
air temp: 9.1degC ,dewpt temp: 8.1degC
AXBT dropped at 1738UTC at 38.8N,123.6W
|
1733 UTC
|
at 38.97N, 123.80W, 987 mb:
heading: 146deg at 700 ft
winds: 143deg, 44kt
air temp: 9.0degC ,dewpt temp: 8.3degC
|
1729 UTC
|
LLJ:
At 39.05N, 123.96W
winds: 153deg, 50kt,at 940mb
mixing ratio: 6.8g/kg
|
1716 UTC
|
at 38.59N, 123.42W, 814 mb:
heading: 329deg at 6000 ft
winds: 184deg, 31kt
air temp: 0.5degC ,dewpt temp: -0.1degC
About to make AXBT drop.
|
1704 UTC
|
at 38.45N, 123.55W, 985 mb:
heading: 88deg at 800ft
winds:148deg, 43kt
air temp: 8.6degC ,dewpt temp: 8.2degC
Mixing ratios at/near
8 g/kg within the low level jet.
During spiral down: saw 45kt jet at 940mb level
from the south, mixing ratios up to 8 g/kg.
|
1700 - 1100 UTC
|
|
1659 UTC
|
Sounding from CZD:
T(C) Alt (m) p(mb)
0 1908 804
-3 2488 748
-8 3386 667
-13 4204 599
-22 5568 500
|
1642 UTC
|
at 38.2N, 123.96W, 987mb:
heading: 82 deg at 750 ft
winds: 163deg, 42kt
air temp: 10.2degC, dewpt temp: 9.6degC
|
1632 UTC
|
At 38.1N, 124.2W, 877 mb:
heading: 349deg at 4000 ft
winds:190deg, 22kt
air temp: 4.6degC , dewpt temp: 1.3degC
|
1610 UTC
|
|
1608 UTC
|
at 38deg17minN, 123deg47min, 988 mb:
heading: 222deg , at 700 ft
winds: 148deg, 39kt
air temp: 9.9degC ,dewpt temp: 9.7degC
|
1545 UTC
|
at 38deg44minN, 123deg7minW, 678mb:
heading: 178deg at 10000ft moving to pt 11
winds 181deg, 42kt
air temp: -7.1degC, dewpt temp: -9.7degC
|
1500 UTC
|
at 38deg14minN, 123deg12minW, 989mb:
(heading:346deg, moving to pt 4 at 750ft)
winds: 141deg, 36kt
air temp:8.4degC, dewpt temp: 8.1degC
LLJ: max 40kt at 2000ft 6.6g/kg
|
1450 UTC
|
|
1450 UTC
|
Sounding from BBY:
T(C) Alt (m) p(mb)
0 2052 790
-3 2647 733
-8 3197 683
-13 3838 629
-21.6 5561 500
|
1430 UTC
|
at 36deg0minN, 122deg26minW, 991 mb (1000 ft):
winds: 152deg, 39kt
air temp: 11.2degC, dewpt temp:3.5degC
|
1352 UTC
|
Sounding from BBY:
T(C) Alt (m) p(mb)
0 2052 790
-3 2647 733
-8 3305 674
-13 3928 622
500mb -21.9 C 5567 m
|
1234 UTC
| Sounding from CZD:
T(C) Alt (m) p(mb)
0 2012 795
-3 2389 758
-8 3280 676
-13 4054 611
500 mb -21 C 5565 m
|
---|
Status |
Observations |
Forecast Discussion |
Flight Plan |
Aircraft Status |
Soundings Status |
Forecast Discussion |
Forecast discussion for 17 February 2001
1445 PST:
IR satellite imagery depicts N30.06/W123.73 north to SFO Bay. Lower temp
cloud top area continues to shrink with lowest readings in the -35/-38C
range. Cloud top temps of -43C west of Santa Cruz and into North SFO
Bay. While flow is south-to-north, eastward progression of the system
reamins quite slow and averaging only 25Kts over the last 8 hours. Some
orographic enhancement of cloud cover now showing up over the Southern
sierra Nevada and light shower activity into the South SAC Valley.
Gudgel
1415 PST:
IR
Satellite imagery at 22Z shows dimishing area of lower temps at cloud
top from N29.45/W123.87 north to N39.0/W123.2. Still some readings at
-45C, especially west of Golden Gate and southwest of Monterey Bay, but
generally warming elsewhere. Very little activity west of W124.5.
Strongest radar returns over the Santa Cruz Mountains at 38dbz otherwise
generally 20dbz along depicted line 60 south of Santa Cruz northward
into N-Central California.
Rain reports: Yorkville 1.22"/Venado 1.04"/Cazadero 1.63"
Gudgel
1320 PST:
IR Satellite imagery depicting the area of lowered temps at cloud top
from N35/W124.0 south to N30.2/W124.2 beginning to show signs of
stretching out and no longer blossoming. Rain echoes in the flow pattern
pretty much parallel to CA coast flowing northward with only a slight
eastward movement of the band (approx 10Kts). Acknowledge reports from
PACJET P3 about 50dbz echoes southwest of Santa Cruz in the just
offshore band. No apparent development behind the slowly eastward
moving band with the back edge from N30/W126 north to N44/W126.
Precip totals as of 1300 PST: SFO Trace / Crescent City 6-hr 0.22" /
Arcata 6-Hr 0.13". Venado storm total as of 1300 PST at 0.92".
Gudgel
1245 PST:
Satellite imagery as of 2030Z (1230 PST) depicting lowering temps at
cloud tops in areas centered around N34.7/W123.38 and N32.99/W124.12
embedded in line from N39.14/W121.86 SSW to N30.0/W124.97 and apparently
associated with frontal position. Widespread area of low temps along
California coast north of Point Reyes from N37.62/W124.51 N to N45.07/
W124.73. Onshore radar showing area of 30dbz about 30NM SW of SFO in
N-S band of rain.
Rain reports indicate over 0.68" at Venado in the last 12 hours with
Yorkville getting 0.88". Ukiah has had 0.14" in the last hour.
Gudgel
1215 PST:
Heavy Rain reported at Santa Rosa with 40dbz echo in the area. Higher
reflectivity line from ground radar N39.1/W122.82 extending SSW to
N36.4/W122.92 with general dbz values of 20-25...areas of 30-40dbz.
Gusts here at Monterey 14-21knots from 180 degs. IR imagery at 1952Z
depicting low temps at cloud top from N38.63/W120.09 SSW to
N30.1/W122.89: another at N38.44?W122.51 SSW to N30.2/W124.78 with the
aforementioned area of enhancement in this line around N32.34/W124.53
and extending NNE to N35.83/W123.22.
Rain at Cazadero now over 1" storm total. Santa Rosa rain 0.06" in the
last hour Wind 26008KT / Ukiah 0.16" Wind 19015KT / Arcata 0.03" Wind
14011KT.
Gudgel
1150 PST:
Satellite Imagery at 1930Z depicts quickly expanding area of cold cloud
tops (-44C) centered at N32.20/W124.68 and moving NNE (15 deg T.N.)
approximately 30knots. Most notable in just the last 2 hours. This
area acts as south anchor of a line beginning to show lowering cloud top
temps extending northward to N35.75/W123.1.
Gudgel
1140 PST:
Buoy #59 at 19Z: Wind 260/18G26 Air Temp 51F/Sea Temp 54F Press 1007.5
Wave 13 Feet, Data 14 Seconds
IR Satellite showing at area of weak PVA enhancing southern end of line
centered N31.35/W125.03 streaming NNE at 25kts up the existing of
current front/rain location off California Coast.
Gudgel
1100 PST:
Morning Brief just concluded.
Precip reports as of 1000 AM PST: Crescent City 0.06" / Arcata 0.07" /
Ukiah 0.03" / and Santa Rosa 0.04". Cazadero 0.22" in the last 2-hours
(16-18z).
Radar depicting band of precip centered N41.72/W124.07 south to N39.3/
W123.77 with strongest echoes around N40 at 40dbz but echoes generally
in the 20-25dbz range. Another band of echoes extending just offshore
centered N38.08/W123.29 south to N36.57/W123.33 with echoes 20-25dbz.
Gudgel
0930 PST:
Last Hourly Rain Reports: Crescent City 0.07" / Arcata 0.05" / Ukiah
0.08" / Santa Rosa Trace / Cazadero 0.30" (2-hour 14-16Z) with a surface
temp of 6.2C and wind southeast at 10-12Kts.
Area of brightest echoes (values 45-50dbz) on coast in N-S line from
N40.76/ W124.39 south to N39.94/W124.26; and aligning with colder cloud
tops at 1715Z (0915 PST). Another N-S line of instability enhancement
beginning to show up on IR satellite imagery along W127.40 at N40.
Eastward movement about 15-20kts.
Gudgel
0845 PST
A line of narrow and currently weak instablity behind onshore band
beginning to show up on satellite IR imagery as of 1630Z orientated
along N-S line at W127.7 (between Lightning strike depicted at
N40.9/W127.71W (and also the farthest south point of lower cloud top
temp at -32.5C).
Gudgel
0830 PST:
Southern extent of cold air appears to be around N39.3 with the leading
edge reaching W132.0. Back edge of surface coldfront continuing to slow
with latest 6-hour average around 17knots east component. At 1600Z,
back edge from N40.0/W126.38 southward to N34.19/W126.91 and then
southwest...highest echoes around 40 maybe 45dbz at coast at N40.
Another high cloud band (cloud top temps -32C in the north to -47C over
SFO Bay) back edge line from N40.38/W122.5 south to West SFO Bay to
N36.64/ W122.65 at 1600Z...Highest radar echoes with this band appear to
be 30dbz at N38.84/W122.52.
Precipitation totals last hour: Crescent City 0.05" / Arcata 0.01" /
Ukiah 0.08" / Santa Rosa 0.02" / No Rain at SFO but a trace at Oakland.
Cazadera precip 0.17" in the last hour (14-15Z).
Gudgel
0730 PST:
Precipitation at Cazadero started accumulating at about 0340 PST. Total
as of 0700 PST was 0.26"...Crescent City 0.03" last hour/ Arcata Trace/
Ukiah 0.07" / Santa Rosa 0.02" / Shelter Cove had 0.42" in last 15 hours
(once/day report) / No Rain yet at SFO.
Composite Radar Reflectivity showing two bands along coast north of SFO
Bay. First band centered along N41.0/W124.63 to N38.88/W124.40 with
echoes primarily in the 20-25dbz range...one area of 40dbz at N40.3/
W124.47. The other band onshore roughly entered at N41.04/W124.13 south
to N39.31/W123.85 with echoes 40dbz elongated along N40.82/W124.16 to
N40.14/W123.84.
Gudgel
0630 PST Report:
1330Z IR satellite imagery depicts back edge of surface frontal band
north-south alignment along W127.5 and separated from large area of
upper cloud shield that has moved ahead with back edge along W126.0.
Some upper cloud top temps of -38.0C over surface edge farthest north at
N39.0 and extending southward with enhancement south of N35.0. Some
Farallon Islands light drizzle/light rain as of 0600 AM PST. Surface
front appears to have slowed significantly based on back edge movement
of 20 knots over the last 7 hours. Light rain reported at Crescent City
with 0.01"; Arcata not raining but trace of rain last hour; Ukiah light
rain and 0.01"; Santa Rosa not raining but trace in the last hour.
Gudgel
|
Status |
Observations |
Forecast Discussion |
Flight Plan |
Aircraft Status |
Soundings Status
Flight Plan |
|
Monterey - Pt. 1
|
3,000 ft w/ porpoises 500-5,000 ft.
|
Pt. 1-2-3
|
Frontal module 500 - 18,000 ft.
|
Pt. 3-4-5
|
Full blocking stack 500 - 5,000 ft.
|
Pt. 5-6
|
5,000 ft.
|
Pt. 6-7
|
Partial blocking stack 500 - 5,000 ft.
|
Pt. 7-8-10-7
|
Blocking stack along coast 500-5,000 ft.
|
Pt. 7-11
|
Fly MVA to pt. 11 and spiral up to 12,000 ft.
|
Pt. 11-7
|
Fly 12,000 ft to Pt. 7 and spiral down to 500 ft.
|
Pt. 7-12
|
3,000 ft with porpoises 500-5,000 ft.
|
Pt. 12-13-14-15
|
Frontal module 500-20,000 ft.
|
Pt. 15-16
|
750 ft.
|
Pt. 16,17,18
|
Spiral to MVA and then go to Pt. 18
|
Pt. 18-19
|
MVA + 5,000-7,000 ft
|
Pt. 19-20
|
750 ft. with porpoises 500-6,000 ft.
|
Pt. 20-21
|
750 ft. with porpoises 500-6,000 ft.
|
Pt. 21 - Monterey
|
Return to Monterey.
|
|
Status |
Observations |
Forecast Discussion |
Flight Plan |
Aircraft Status |
Soundings Status |
Aircraft Status |
Saturday, February 17 |
0600 PST take off.
|
Sunday, February 18 |
1600 PST flight.
|
Monday, February 19 |
Possible flight.
|
Status |
Observations |
Forecast Discussion |
Aircraft Status |
Soundings Status |
Sounding Status |
17 February |
Bodega Bay | Soundings starting at 12Z continuing with event. |
Cazadero | Soundings as event develops. |
Oakland | Soundings requested at 15, 18 and 21Z. |
Reno | No special soundings requested. |
18 February |
Bodega Bay | Soundings as event develops. |
Cazadero | Soundings as event develops. |
Oakland | Soundings requested at 3Z. |
Reno | No special soundings requested. |
19 February |
Bodega Bay | Soundings as event develops. |
Cazadero | Soundings as event develops. |
Oakland | Soundings requested at 9, 15, 18 and 21Z. |
Reno | No special soundings requested. |
|
|