PACJET Projects
HMT 2004
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
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2001 - Monterey, CA
July 13-14 2000 (Boulder, CO)
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Program Status for 21 February 2001

Status | Observations | Forecast Discussion | Flight Plan | Soundings Status

Status (Updated: 0700 PST Wednesday, 21 Feb)
Next Update: 22 Feb 1500 PST.
Wednesday, February 21 No weather briefing.
Flight completed for today.
Thursday, February 22 P3 hard down day.
Weather briefing 1000 PST.
Saturday, February 24 PACJET Open House: 12 - 4 near the Monterey, CA Airport.

Status | Observations | Forecast Discussion | Flight Plan | Soundings Status

2339 UTC at 35.93N, 122.02W (reached pt 5'):

   P(mb)  Ht(m)  T(C)   Td(C)  ff(kt)  dd(deg)
    800   2019    4.6   -32.0   20      228
    825   1764    6.1   -31.8   17      227
    850   1522    8.0   -31.6   15      237
    875   1284    7.5   -26.5   16      197
    900   1053    7.3    -1.6   19      184
    925    827    8.0     2.9   10      143
    950    604    8.9     7.0   13      153
    975    386    9.9     9.2   17      145
    985    297   10.4    10.1   16      143 (1000 ft)

Now heading to MRY at 1000 ft.

2323 UTC at 36.41N, 121.12W, 761 mb:

winds: 231 deg, 23kt
air temp: 1.9degC
dewpt temp: -32.6degC
mix rat: 0.3g/kg

2306 UTC at 36.70N, 120.57W, 761mb:

winds: 233deg, 26kt
air temp: 2.0degC
dewpt temp: -32.1degC
mix rat: 0.3g/kg

2306 UTC at 36.81N, 120.35W, 762 mb:
At porp bott ( 8000 ft):

winds: 230deg, 23kt
air temp: 1.3degC
dewpt temp: -37.5degC
mix rat: 0.2g/kg

Currently heading back to pt 5' at 8000 ft. After pt 5', head to MRY over ocean at 1000 ft.

2302 UTC at 36.68N, 120.62W, 578 mb:
At porp top ( 14000 ft)

winds: 244deg, 37kt
air temp: -12.8degC
dewpt temp: -38.2deg
mix rat: 0.2g/kg

2254 UTC at 36.39N, 121.19W, 758 mb:
At porp bottom ( 8000 ft)

winds: 230deg, 32kt
air temp: 1.5degC
dewpt temp: -36.6degC
mix rat: 0.2g/kg

2241 UTC at 36N, 121.99W, 577 mb:
making drop at pt 5' from 15000 ft.

winds: 248deg, 37kt air temp: -13.7degC
dewpt temp: -38.6degC
mix rat: 0.2g/kg

Drop winds look good.

2240 UTC at 35.95N, 121.96W

     P(mb)  Ht(m)  T(degC)  Td(degC)  ff(kt)  dd(deg)
     1019.3  -SFC   10.4      9.3       17      125
      925     840    7.2      5.9       16      190
      850    1531    5.4    -36.6       22      225
      700    3095   -3.3    -49.3       30      260

2222 UTC Spiral up at pt 14'.

     P(mb) Ht(m)  T(degC) Td(degC)  ff(kt)  dd(deg)
      850   1542   5.0      3.9       22      257
      800   2036   4.3    -18.9       15      246
      750   2550   1.8    -28.3       15      264
      700   3110  -1.6    -30.7       20      271

Have run into ATC problems. Could not spiral up to 15000 ft. Touched 10000 ft before exiting pt 14'.
2221 UTC at 35N, 121.5W (pt 14'), 986 mb (1000 ft)
spiralling up to 15000 ft, then moving to pt 5'

winds:205deg, 14 kt
air temp:10.8degC
dewpt temp: 10.6degC
mix rat: 8.2g/kg

Old remnants of "front" only evident in moisture gradient. Winds show no clear shift in direction or speed.

2153 UTC 36.06N, 123.13W (pt 13), 986 mb (1000 ft):
heading to pt 14' at 1000ft (reach 14' in ~27 min.)

winds: 177deg, 4kt
air temp: 10.4degC
dewpt temp: 4.0degC
mix rat: 5.2g/kg

2135 UTC at 36.54N, 122.36W, 925mb:

winds: 184deg, 15kt
air temp: 6.7degC
dewpt temp: 4.7degC
mix rat: 5.9g/kg

Currently spiralling down to 1000 ft at pt 11, will move to pt 13, then to pt 14' (35N, 121.5W) at 1000 ft, spiral up to 15000 ft at pt 14', move to pt 5' at 15000 ft, drop a sonde, then porpoise from 5' to 6', then head back to pt 5' at MVA.

2130 UTC Got clearance to 14' (35N, 121.5W)

Will travel from 11 to 13 to 14' at 1000 ft spiral up to 15000 ft at 14', travel over to 5', drop a dropsonde at 5', porpoise in from 5' to 6', transit back from 6' to 5' at MVA, then home.

2059 UTC at 37.01N, 121.47W, 602 mb ( 14000 ft):
Running porpoise between pts 11 and 12

winds: 256deg, 42kt
air temp: -11.8degC
dewpt temp: -37.3degC
mix ratio: 0.3g/kg

2015 UTC At pt 8', downward spiral:
(completed at 2015 UTC):

     P(mb) Ht(m)   T(degC) Td(degC) ff(kt) dd(deg)
     650     -      -7.5     -39.2    36     246
     700     -      -3.0     -39.5    26     247
     750   2545      0.5     -38.3    24     221
     800   2028      3.8     -36.2    27     213
     850   1529      4.8     -31.4    25     214
     900   1061      5.1       4.9    20     201
     925    762      7.0       5.4    18     196
     950    622      8.4       7.2    20     200
     975    404      9.6       9.5    20     167
    1000    197     10.9      10.5    16     167

Heading to pt 11 at 1000 ft

2001 UTC at 36.24N, 122.23W, 601 mb (14000ft)

winds: 255deg, 42kt
air temp: -11.6degC
dewpt temp:-37.8degC
mixing ratio: 0.2g/kg

1954 UTC 36.51N, 121.73W, 736 mb (9000 ft)
heading: 240deg to pt 8'

winds: 243deg, 24kt
air temp: -0.4degC
dewpt temp: -38.7degC
mix rat: 0.2g/kg

1947 UTC at 36.76N, 121.28W, 730 mb
porp bottom ( 9000 ft)

winds: 243deg, 26kt
air temp: -1.2degC
dewpt temp: -38.4degC
mix rat: 0.2g/kg

1942 UTC at 36.91N, 121.01W, 601 mb
porp top ( 14000 ft)

winds: 259deg, 38kt
air temp: -11.0degC
dewpt temp: -39.0degC
mix rat: 0.2g/kg

1918 UTC 37.02N, 120.77W, 776mb:
At pt 9' beginning porpoise between 8' and 9'

winds: 230deg, 20kt
air temp: 1.7degC
dewpt temp: -34.7degC
mix rat: 0.3g/kg

1910 UTC at 36.32N, 122.15W, 790 mb:
heading: 68deg at 7000 ft

winds: 218deg, 27kt
air temp: 2.0degC
dewpt temp: -32.4degC
mix rat: 0.3g/kg

Just touched pt 8'. Cruising at 7000 ft from pt 8' to 9'

1900 UTC At 36degN, 121deg59minW, 1000 ft

winds: 155deg, 27kt
air temp: 9.6degC
dewpt temp: 9.5degC
mix rat: 7.5g/kg

Observed wind speeds drop to below 10kt during descent from 8500 to 1000 ft at pt 5'.

1851 UTC At 36degN, 121deg59minW, 745 mb
will now head to pt 8'

winds:239deg, 24kt
air temp:0.5degC
dewpt temp:-34.1degC
mix rat: 0.3g/kg

1839 UTC at 36.40N, 121.21W, 745mb:

winds: 253deg, 29kt
air temp: 0.1degC
dewpt temp: -35.1degC
mix rat: 0.3g/kg

1833 UTC On track between pts 5' and 6', mountain wave clouds are evident outside P-3.

Had to change to 8500 ft at 1833UTC, 36.57N, 120.8W due to ATC on leg outbound to pt5'.

1818 UTC at 36.78N, 120.46W, at 753 mb (8000ft)
During porpoise between pts 5' and 6'

winds: 246deg, 25kt
air temp: -0.2degC
dewpt temp: -12.4degC
mix rat: 2.6g/kg

Got only one porpoise in between pts 5' and 6' due to air traffic conflicts. Will now head to porpoise between points 7' and 8' after heading out to point 5' at 8000 ft.

1810 UTC at 36.28N, 121.42W, 759 mb (porp bottom)

winds: 247deg, 30kt
air temp: 1.4degC
dewpt temp: -35.5degC
mix rat: 0.3g/kg

During porpoise between pts 5' and 6'.

1805 UTC at 36.49N, 121.05W, 595 mb (porp top)

winds: 249deg, 36kt
air temp: -13.3degC
dewpt temp:-30.0degC
mix rat: 0.6g/kg

During porpoise between pts 5' and 6'.

1751 UTC at 36.07N, 121.89W,
at 580 mb ( 15000 ft)

winds: 255deg, 37kt
air temp: -14.2degC
dewpt temp:-29.8degC
mix rat: 0.5g/kg

Modified pts 8 and 9 (pt 8' and pt 9')

pt 8' 36deg15minN, 122deg12minW

pt 9' 37deg7minN, 120deg41minW

1749 UTC at 36.07N, 121.89W,
at 750 mb ( 8000 ft)

winds: 246deg, 21kt
air temp: 0.2degC
dewpt temp: -29.6degC
mix rat: 0.4g/kg

1747 UTC at 36.07N, 121.89W,
at 800 mb ( 6000 ft)

winds: 217deg, 25kt
air temp: 1.6degC
dewpt temp:-0.7degC
mix rat:3.2g/kg

1745 UTC at 36.07N, 121.89W,
At 925 mb:

winds: 184deg, 22kt
air temp: 7.1degC
dewpt temp: 6.8degC
mix rat:6.8g/kg

1744 UTC at 36.07N, 121.89W,
at 500 ft (1006mb)

winds: 141deg, 27kt
air temp:10.1degC
dewpt temp: 9.7degC
mix rat: 7.5g/kg

Spiral up at pt5'.

1731 UTC at 35.62N, 121.78W, 763mb

winds: 241deg, 27kt
air temp: 0.6degC
dewpt temp: -29.0degC
mix rat: 0.4g/kg

Air space between pts 3 and 4 has been closed. Air space is also closed between points 5 and 6. Will move section 5-6 NW to 5'-6' where pt 5' is 36degN, 121deg59minW and pt 6' is 36degN51minN, 120deg22minW.

Will also move pts 8 and 9 to make spacing more even between 3 NW-most sections. Will then return to section pts5'-6' for second sampling late in flight, since airspace between points 3 and 4 will remain hot all day.

1715 UTC at 35.93N, 120.84W, 762 mb
At porp bottom (8000 ft)

winds: 251deg, 28kt
air temp: 0.2
dewpt temp: -3.2
mix rat: 3.8g/kg

1707 UTC at 36.26N, 120.25W, 578 mb:
At porp top (15000 ft)

winds:254deg, 34kt
air temp: -13.9degC
dewpt temp: -23.3degC
mix rat:1.1g/kg

1643 UTC at 36.02N, 120.70W, 760mb:
heading to pt 4 at 8000 ft

winds: 259deg, 25kt
air temp: -0.1degC
dewpt temp:-2.4degC
mix rat: 4.1g/kg

MVA has been changed on first cross-coast leg to 8000 ft MSL.

1630 UTC AT 35.52N, 121.59W, 821mb:
at pt 3 (MVA is 6000 ft on leg1)

winds: 260deg, 24kt
air temp: 3.3degC
dewpt temp: 2.8degC
mix rat: 5.7g/kg

Evidence of shallow blocking west of coast. winds at 1000 ft: 160-170deg, as high as 20kt before spiral at pt 3.

1611 UTC at 35.38N, 122.52W, 987mb:
heading: 149deg at 1000 ft (2min from pt 2)

winds: 209deg, 19kt
air temp: 11.4degC
dewpt temp: 10.7degC
mix rat: 8.3g/kg

Winds back to Southwesterly.

Just passed through distinct moisture boundary. Turbulence has picked up from non-existent to some chop. ThetaE changed from 304K to 308K within 10min of latitude.

1542 UTC at 36.6N, 123.41W, 987mb:
heading to pt 1 at 1000 ft

winds: 310deg, 7kt
air temp: 10.5degC
dewpt temp: 3.2degC
mix rat: 4.9g/kg

Winds have become Northwesterly.

1533 UTC at 36.69N, 122.78W, 987mb:
heading to pt 1 at 1000 ft

winds: 250deg, 11kt
air temp: 10.3degC
dewpt temp: 9.9degC
mix rat: 7.7g/kg

Winds have slacked and become Southwesterly.

1522 UTC 36.71N, 122.01W, 937mb:

winds: 186deg, 29kt
air temp: 8.1degC
dewpt temp: N/A

Status | Observations | Forecast Discussion | Flight Plan | Soundings Status

Forecast Discussion
Shortwave moving into the northern California coast is still producing some isolated lightning strikes. Visible imagery is showing a farily vigorous band of showers extending from 39N to 43N along 125W poised to hit the northern California and southern Oregon coastlines. Visible imagery is also indicating signs of weakening in this shortwave south of 39N. Checking rainfall data west of current flight path...reports of only .04" at Chews Ridge, Three Peaks, and Mining Ridge in the Santa Lucia range over the pase 3 hrs. What is left of this mornings front is now pushing south near 34.43N and 121.65W.

1340 PST
The upper level low off the coast of northern California circulating near 40N/130W will gradually move towards the California/Oregon border by Thursday morning. A rotating shortwave around this low will bring a band of showers and isolated thunderstorms to northern California through this evening. A stronger vort max will then reach the California coast early Thursday morning associated with the upper level low. The upper level low is then expected to track inland over Eureka Thursday afternoon before heading south and digging a trough over southern California by Friday morning. In the meantime expect showery conditions to continue over northern California with sufficient instability and moisture in place over the area.

In the extended...Weak ridging is expected to build over the area by Friday afternoon. This ridging will be very short lived as another system approaches the area on Saturday. The AVN is slightly quiker than the MRF in the progression of this system...but this seems reasonable considering the progressive flow of a zonal patter. Consequently expect light over-running precip to reach the coast by early Saturday afternoon with the associated cold front reaching the central California coast sometime Saturday night. The upper level low with this system will eventually move into southern Oregon by early Monday morning before yet another storm drops south along the coast on Tuesday.

Lightning returns have been spotted off the coast of Eureka at 40.82N/125.74W associated with a strengthening shortwave rotating around the approaching upper level low. 3 - strikes have been detected in the last 30 min.

1140 PST
A weak shortwave rotating around the upper level low is begining to produce some precip off the northern California coast. Radar out of Eureka is begining to show a broad area of light to moderate showers at 40N/125W moving towards the west at approximately 20 KT/hr. The southern extend of this shortwave extends down to 37.35N/125.75W and this band appears to be about 60 KM wide. Radar returns around the bay area at this time have quited down with no significant returns found anywhere. Latest hourly rainfall reports continue to confirm this with only a few hundreths of an inch found anywhere.

1050 PST
Satellite imagery continuing to indicate a large section of the moisture plume thinning out as it approaches the California coast. Best enhancement and organization continues to occur further west near 34N/128W south of the upper level low near 40N/133W. Diffuse frontal boundary is currently tracking south through Monterey but few significant rainfall reports can be found. A few hundreths to .10" of rain have fallen in isolated locations in the Santa Cruz mountains the past hour. The Santa Lucia mountains have been mostly dry for the past 2 hours.

A thinning out of the moisture plume in IR and WV imagery is now evident over a large area between 33.5N/122.5W and 35.27N/124.4W extending out to 30.9N/127.57W and 33.16N/128.33W streaming rapidly towards the west. Some enhancement in IR is now occuring farther offshore near 31N/132W where -46C tops are now visible on IR imagery. Current profiler data at GLA showing light (10kt or less) winds up to 1300m from the west. No new rainfall data to report. ROSSI

0830 PST
Latest Imagery clearly showing moisture plume begining to slowly sag southward as a result of upper level low near 39.82N/133.15W. Hourly rainfall reports ending at 1600Z indicating an additional .24" rain fell at Chews ridge (36.45N/121.30W) last hour and an additional .12" at Mining Ridge (36.35N/121.30W). Radar out of MTR is continuing to show widely scattered light returns this morning and no significant enhancement or organization of of moisture plume is evident.

0749 PST
Moisture plume exending from approximately 37.10N down to 34.02N and out past 140W will stream across the area today. Presently MTR radar is indicating a few light showers embedded in this mass of clouds, but large scale organized areas of precip. Isolated cloud tops in this plume can be located in the -35C to -39C range...with the most widespread cold cloud tops out near 31.5N and 133W. Precip reports last hour from RAWS sites in the Santa Lucia Range indicate .20" rain fell at Chews Ridge (5040FT) and .08" at Mining Ridge (4710 FT). 15Z sounding at OAK indicating winds increasing to 40KT from the SW by 3500 FT.

Status | Observations | Forecast Discussion | Flight Plan | Soundings Status

Flight Plan
The emphasis of the flight plan for 21 Feb 2001 (IOP-13) will be to sample atmospheric flow along the Santa Lucia coastal mountain range both before and after frontal passage. There will also be legs of the flight track dedicated to frontal surveillance offshore and to downslope frontal precipitation processes in the lee of the Santa Lucia range, provided there is significant precipitation associated with this frontal passage. The computer models have been poorly initialized for this case, so the certainty of having the right conditions at the right time is not high.

MRY - 1 - 2 -3 1,000 ft
3 spiral up to MVA
3 - 4 Level MVA
4 - 3 Propoise MVA + 7,000 ft
3 Spiral down to 1,000 ft.
3 - 5 1,000 ft.
5 spiral up to MVA
5 - 6 Level MVA
6 - 7 Porpoise MVA + 7,000 ft.
7 spiral down to 1,000 ft.
7 - 8 1,000 ft.
8 spiral up to MVA
8 - 9 Level MVA
9 - 10 Porpoise MVA + 7,000 ft.
10 spiral down to 1,000 ft.
10 - 11 1,000 ft.
11 spiral up to MVA
11 - 12 Level MVA
12 - 13 Porpoise MVA + 7,000 ft.
13 spiral down to 1,000 ft.
13 - 14 - 3 1,000 ft.
3 spiral up to MVA
3 - 15 - 16 Level MVA
16 - MRY Return to MRY

Status | Observations | Forecast Discussion | Soundings Status

Sounding Status
21 February
Bodega BaySoundings as event develops.
CazaderoSoundings as event develops.
Oakland3 hourly soundings requested from 12 Z 21 Feb to 0Z 22 Feb.
RenoNo special soundings requested.
22 February
Bodega BaySoundings as event develops.
CazaderoSoundings as event develops.
Oakland3 hourly soundings from 21 Feb completed at 0Z 22 Feb.
RenoNo special soundings requested.