ALL COORDINATES ARE IN LAT-LON
ALL LATITUDES ARE FROM WEST OF GREENICH
ALL TIMES ARE YYMMDDHHMM IN UTC TIME
DATE AND TIME OF REQUEST: 9901111800
DATE AND TIME OF TAKE-OFF: Around 9901121900
COORDINATES OF TURNING POINTS ON FLIGHT: Use North Pacific Track #16
40N 164W Control time: 9901130000 (no later than: 9901130600)
DESIRED LEVEL OF DROPSONDE RELEASE: Highest level possible
TOTAL NUMBER OF DROPSONDES REQUESTED: Approximately 20
COORDINATES OF DROPSONDES:
At each turning point, plus, on average, one every half hour between turning points. If a sonde fails, please try to replace it immediately. The sensitive area is south of 47N; the frequency of sondes here could be increased to 20-25 mins (and decreased elsewhere, if necessary).
COMMENTS: We may request a flight centered around 00Z 98011500.
NATURE OF UNCERTAIN SYSTEM: Low pressure waves reaching the Washington, then the Oregon and Northern California coast, causing 2-3 inches of precipitation in the coastal areas.
TIME OF UNCERTAIN SYSTEM: 990114120000
LOCATION OF UNCERTAIN SYSTEM: 47.5N 125W
FLIGHT PLAN BASED ON SENSITIVITY RESULTS FROM:
Ensemble Transform technique, using NCEP ensemble from 99011100
(time window: 99011300-9901141200)
COMMENTS: The most sensitive area is further S of the requested track
(centered around 35N 165W). The sensitivity chart can be seen at: