Program Status for Thursday, 1 March 2001

Status Updated: 1130 PST Thursday, March 1 Next Update: 1500 PST Friday, March 2.
Thursday, March 1	No weather briefing. P3 flight canceled due to mechanical problems.
Friday, March 2	Final program weather briefing at 1000 PST. G-IV flight scheduled for 1200 PST (2000 UTC) take off. P3 down for maintenance.

Dropsondes from the NOAA G-IV aircraft and their apparent impact on Aviation (AVN) model analysis 0000 UTC 1 March 20001 during PACJET IOP 16. The 12-h forecast low center was 989 mb, while the observations indicated a central pressure <978 mb, likely 974-976 mb. The AVN analysis, which included the dropsonde data, produced a 979 mb low and nearby winds much closer to reality than the previous 12-h forecast valid at that time.

(A) Aviation model 12-h forecat of mean sea level pressure and 1000 mb winds initialized at 1200 UTC 28 Feb 2001, valid at 0000 UTC 1 March 2001. The track of the NOAA G-IV and approximate locations of dropsondes launched and transmitted between 2200 UTC 28 Feb and 0245 UTC 1 Mar for assimilation into the operational models are also shown. Selected dropsonde observations of surface wind and pressure are shown for comparison.

(B) As in (A), but the AVN model output shown is the analysis valid at the same time as in (A) (0000 UTC 1 Mar 2001), after assimilation of PACJET G-IV dropsonde observations.

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

Observations
1730 UTC	IOP 16 has been canceled due to mechanical problems. The P3 is due in Monterey at 1100 PST.
1707 UTC	at 40.0N, 124.74W heading: 326deg at 18000 ft (32 min to pt 1) At 505mb: winds: 307deg, 43kt air temp: -14.4degC dewpt temp: -16.0degC
1646 UTC	at 38.78N, 123.72W heading: 325deg, at 18000 ft (1h to pt 1) at 506mb: winds: 301deg, 32kt air temp: -15.6degC dewpt temp: -17.5degC mix rat: 1.9g/kg
1626 UTC	at 37.67N, 122.83W heading: 329deg at 18000 ft (1h 10 min to pt 1) at 505mb: winds: 337deg, 34kt air temp: -16.2degC dewpt temp: -19.4degC mix rat: 1.6g/kg
1605 UTC	Out of MRY: at 850mb level winds: 189deg, 13kt air temp: 2.4degC dewpt temp: -7.1degC

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

Forecast Discussion

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

Flight Plan
MRY - 1 80 - FL200 Transit 1 Spiral descent to 1000 ft. 1-2 Flux stack; four 15 minute legs 500 to 3,800 ft. 2-3 1,000 ft. 3 Spiral ascent to FL200. 3-4 FL200 4 Spiral descent to 1,000 ft. 4-5-6-7 1,000 ft. 7-6-7 Repeat 1,000 ft. legs. 7-8 1,000 ft. 8 - MRY Transit

Status | Observations | Forecast Discussion | Soundings Status

Sounding Status
1 March
Bodega Bay	No soundings.
Cazadero	No soundings.
Oakland	No special soundings requested.
Reno	No special soundings requested.
2 March
Bodega Bay	No soundings.
Cazadero	No soundings.
Oakland	No special soundings requested.
Reno	No special soundings requested.