REQUEST FOR C-130 FLIGHT FROM NCEP

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
Anchorage
45N 166W
40N 164W Control time: 9901130000 (no later than: 9901130600)
40N 157W
48N 152W
Anchorage

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.

BACKGROUND INFORMATION

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:
http://wwwt.emc.ncep.noaa.gov/gmb/targobs/target/targetedobs.html

REQUEST FOR C-130 FLIGHT FROM NCEP

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: 9901141800

DATE AND TIME OF TAKE-OFF: Around 9901151900

COORDINATES OF TURNING POINTS ON FLIGHT: Use North Pacific Track #16
Anchorage
45N 166W
40N 164W Control time: 9901160000 (no later than: 9901160600)
40N 157W
48N 152W
Anchorage

DESIRED LEVEL OF DROPSONDE RELEASE: Highest level possible

TOTAL NUMBER OF DROPSONDES REQUESTED: Approximately 20

COMMENTS: We may request a flight centered around 98011700 or 99011800.

BACKGROUND INFORMATION

NATURE OF UNCERTAIN SYSTEM: Low pressure wave reaching the northern California - southern Oregon coast, producing up to 3 inches of precipitation.

TIME OF UNCERTAIN SYSTEM: 990117120000

LOCATION OF UNCERTAIN SYSTEM: 42.5N 125W

FLIGHT PLAN BASED ON SENSITIVITY RESULTS FROM:
Ensemble Transform technique, using NCEP ensemble from 99011400
Ensemble Transform technique, using ECMWF ensemble from 99011312
(time window for both calculations: 99011600-9901171200)

COMMENTS: The most sensitive area is further S of the requested track (centered around 35N 165W). The sensitivity charts and other pertinent information can be seen at:
http://wwwt.emc.ncep.noaa.gov/gmb/targobs/target/targetedobs.html

REQUEST FOR C-130 FLIGHT FROM NCEP

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: 9901151800

DATE AND TIME OF TAKE-OFF: Around 9901161900

COORDINATES OF TURNING POINTS ON FLIGHT: Use North Pacific Track #20
Anchorage
45N 149W
42N 148W Control time: 9901170000 (no later than: 9901170600)
45N 137W
50N 140W
Anchorage

DESIRED LEVEL OF DROPSONDE RELEASE: Highest level possible

TOTAL NUMBER OF DROPSONDES REQUESTED: Approximately 20

COMMENTS: At the same time, the G-lV will fly out of Honolulu, into the area around 32.5N, 162W. We may request a flight centered around 98011800.

BACKGROUND INFORMATION

NATURE OF UNCERTAIN SYSTEMS: (1) Low pressure wave (second in a row, associated with a cold front) reaching the northern California - southern Oregon coast, producing up to 3 inches of precipitation. (2) Closed low traveling to the northeast coast, producing up to 2 inches of precipitation.

TIME OF UNCERTAIN SYSTEMS: (1) 9901180000; (2) 99011912

LOCATION OF UNCERTAIN SYSTEMS: (1) 42.5N 125W; (2) 42.5N 75W

FLIGHT PLAN BASED ON SENSITIVITY RESULTS FROM:
Ensemble Transform technique, using NCEP ensemble from 99011400
(time windows for calculations: 99011700-9901180000 and 99011700-99011912)

COMMENTS: The latest NCEP and ECMWF ensembles, due to problems caused by power outages, were not available. The sensitivity charts and other pertinent information can be seen at:
http://wwwt.emc.ncep.noaa.gov/gmb/targobs/target/targetedobs.html

REQUEST FOR G-lV FLIGHT FROM NCEP

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: 9901151800

DATE AND TIME OF TAKE-OFF: Around 9901162100

COORDINATES OF TURNING POINTS ON FLIGHT:
Honolulu
30N 156.5W
35N 159W
36N 164.5W Control time: 9901170000 Z (no later than: 9901170600)
32N 168W
27.5N 166W
Honolulu

DESIRED LEVEL OF DROPSONDE RELEASE: Highest level possible

TOTAL NUMBER OF DROPSONDES REQUESTED: Approximately 16

COORDINATES OF DROPSONDES:
At each turning point, plus, on average, one every 15-20 mins between turning points. If a sonde fails, please try to replace it immediately. The most sensitive area is norht of 26N; the frequency of sondes here could be increased to 10-15 mins (and decreased elsewhere, if necessary).

COMMENTS: The track can be flown either clockwise or counter-clockwise. At the same time, a C-130 plane will fly out of Anchorage, into the area around 42N, 142W. We may request a flight centered around 98011800.

BACKGROUND INFORMATION

NATURE OF UNCERTAIN SYSTEM: Low pressure wave (second in a row, associated with a cold front) reaching the northern California - southern Oregon coast, producing up to 3 inches of precipitation.

TIME OF UNCERTAIN SYSTEM: 9901180000

LOCATION OF UNCERTAIN SYSTEM: 42.5N 125W

FLIGHT PLAN BASED ON SENSITIVITY RESULTS FROM:
Ensemble Transform technique, using NCEP ensemble from 99011400
(time window for calculations: 99011700-9901180000)

REQUEST FOR G-lV FLIGHT FROM NCEP

ALL COORDINATES ARE IN LAT-LON
ALL TIMES ARE YYMMDDHHMM IN UTC TIME

DATE AND TIME OF REQUEST: 9901171800

DATE AND TIME OF TAKE-OFF: Around 9901182000

COORDINATES OF TURNING POINTS ON FLIGHT:
Honolulu
40N 178E Control time: 9901182330 (no later than: 9901190530)
41N 179W
Honolulu

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 15-20 mins between turning points. If a sonde fails, please try to replace it immediately. The most sensitive area is west of 175W; the frequency of sondes here could be increased to 10-15 mins (and decreased elsewhere, if necessary).

COMMENTS: If the track is too long, please eliminate the second turning point and fly back directly to Hawaii from the control point. The track can be flown either clockwise or counter-clockwise. Mel Shapiro may insert additional high resolution sondes along the track which sondes will not be transmitted in real time. Also, he may lower the flight level to 35000 feet for a period of less than an hour. We may request a flight centered around 98012000, with either the G-lV or a C-130.

BACKGROUND INFORMATION

NATURE OF UNCERTAIN SYSTEMS: (1) Low pressure wave reaching the northern California - southern Oregon coast, producing up to 3 inches of precipitation. (2) Closed surface low, producing up to 4 inches of precipitation over the plains and possibly frozen and/or mixed precipitation east of the Appalachian.

TIME OF UNCERTAIN SYSTEMS: (1) 9901201200
(2) 99012212-99012300

LOCATION OF UNCERTAIN SYSTEMS: (1) 40N 122.55W
(2) 40N 75W (99012212)
37.5N 90W (99012300)

FLIGHT PLAN BASED ON SENSITIVITY RESULTS FROM:
Ensemble Transform technique, using NCEP ensemble from 99011700
(time windows for calculations: 99011900-9901201200, 99011900-99012212, 99011900-99012300)

REQUEST FOR G-lV FLIGHT FROM NCEP

ALL COORDINATES ARE IN LAT-LON
ALL TIMES ARE YYMMDDHHMM IN UTC TIME

DATE AND TIME OF REQUEST: 9901181800

DATE AND TIME OF TAKE-OFF: Around 9901192000

COORDINATES OF TURNING POINTS ON FLIGHT:
Honolulu
29N 178E
Control point is halfway between two turning points
Control time: 9901200000 Z (no later than: 9901200600)
34N 179W
Honolulu

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 15-20 mins between turning points. If a sonde fails, please try to replace it immediately. The most sensitive area is west of 170W; the frequency of sondes here could be increased to 10-15 mins (and decreased elsewhere, if necessary).

COMMENTS: The track can be flown either clockwise or counter-clockwise. Mel Shapiro may insert additional high resolution sondes along the track which sondes will not be transmitted in real time. Also, he may lower the flight level to 35000 feet for a period of less than an hour. We requested that a C-130 plane fly a dropsonde mission centered at 99012000 along North Pacific track #19 (in the area of 42.5N, 147.5W). We may request a flight centered around 98012100, with either the G-lV or a C-130.

BACKGROUND INFORMATION

NATURE OF UNCERTAIN SYSTEMS: (1) Low pressure wave reaching the northern California - Oregon coast, producing more than 2 inches of precipitation. (2) Closed surface low, producing up to 2 inches of precipitation over the southeast, deepening further later on, threatening with more heavy precipitation.

TIME OF UNCERTAIN SYSTEMS: (1) 99012100
(2) 99012300

LOCATION OF UNCERTAIN SYSTEMS: (1) 42.5N 125W
(2) 35N 90W

FLIGHT PLAN BASED ON SENSITIVITY RESULTS FROM:
Ensemble Transform technique, using NCEP ensemble from 99011800, and ECMWF ensemble from 99011712
(time windows for calculations: 99012000-99012100, 99012000-99012300

COMMENTS: This flight is more relevant to the southeast weather system. Sensitivity charts and other related information will be available at:
http://wwwt.emc.ncep.noaa.gov/gmb/targobs/target/targetedobs.html

REQUEST FOR C-130 FLIGHT FROM NCEP

ALL COORDINATES ARE IN LAT-LON
ALL TIMES ARE YYMMDDHHMM IN UTC TIME

DATE AND TIME OF REQUEST: 9901181800

DATE AND TIME OF TAKE-OFF: Around 9901191900

COORDINATES OF TURNING POINTS ON FLIGHT:
Anchorage
47N 154W
42N 153W
40N 147W Control time: 99012000 (no later than: 9901200600)
43N 142W
48N 143W
Anchorage

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 15-20 mins between turning points. If a sonde fails, please try to replace it immediately. The most sensitive area is south of 50N; the frequency of sondes here could be increased to 20 mins (and decreased elsewhere, if necessary).

COMMENTS: The track can be flown either clockwise or counter-clockwise. We requested that the G-lV fly a dropsonde mission centered at 99012000 into the area around 32.5N, 180W. We may request a flight centered around 98012100, with either the G-lV or a C-130.

BACKGROUND INFORMATION

TIME OF UNCERTAIN SYSTEMS: (1) 99012100
(2) 99012300

LOCATION OF UNCERTAIN SYSTEMS: (1) 42.5N 125W
(2) 35N 90W

COMMENTS: This flight is more relevant to the west coast weather system. Note that this flight will also provide data for a weather system verifying around 99012212, around 42.5N, 75W. Sensitivity charts and other related information will be available at:
http://wwwt.emc.ncep.noaa.gov/gmb/targobs/target/targetedobs.html

REQUEST FOR C-130 FLIGHT FROM NCEP

ALL COORDINATES ARE IN LAT-LON
ALL TIMES ARE YYMMDDHHMM IN UTC TIME

DATE AND TIME OF REQUEST: 9901191800

DATE AND TIME OF TAKE-OFF: Around 9901201900

COORDINATES OF TURNING POINTS ON FLIGHT: North Pacific track #19
Anchorage
47N 154W
42N 153W
40N 147W Control time: 99012100 (no later than: 9901210600)
43N 142W
48N 143W
Anchorage

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 15-20 mins between turning points. If a sonde fails, please try to replace it immediately. The most sensitive area is south of 50N; the frequency of sondes here could be increased to 20 mins (and decreased elsewhere, if necessary).

COMMENTS: The track can be flown either clockwise or counter-clockwise. No flight is requested for the G-lV. We may request a flight centered around 98012200, with either the G-lV or a C-130.

BACKGROUND INFORMATION

NATURE OF UNCERTAIN SYSTEM: Closed surface low, producing more than 2 inches of precipitation west of the Appalachian, deepening further later on, threatening with more heavy precipitation, inlcuding up to a foot of snow on its northwest side.

TIME OF UNCERTAIN SYSTEM: 99012300

LOCATION OF UNCERTAIN SYSTEM: 37.5N 87.5W

FLIGHT PLAN BASED ON SENSITIVITY RESULTS FROM:
Ensemble Transform technique, using NCEP ensemble from 99011900, and ECMWF ensemble from 99011812
(time windows for calculations: 990121-99012300

COMMENTS: Note that this flight will also provide data for improving the forecast of the same weather system at later times (99012400, 37.5N, 77.5W). Sensitivity charts and other related information will be available at:
http://wwwt.emc.ncep.noaa.gov/gmb/targobs/target/targetedobs.html

REQUEST FOR C-130 FLIGHT FROM NCEP

ALL COORDINATES ARE IN LAT-LON
ALL TIMES ARE YYMMDDHHMM IN UTC TIME

DATE AND TIME OF REQUEST: 9901201800

DATE AND TIME OF TAKE-OFF: Around 9901211900

COORDINATES OF TURNING POINTS ON FLIGHT:
Extended version of North Pacific flight track #1
Anchorage
54.5N 160W
57N 173W
52.5N 177W Control time: 9901220000 (no later than: 9901220600)
48N 173W
51N 157W
Anchorage

DESIRED LEVEL OF DROPSONDE RELEASE: Highest level possible

TOTAL NUMBER OF DROPSONDES REQUESTED: Approximately 20

COMMENTS: We requested that the G-lV plane fly a dropsonde mission centered at 99012200, recovering on the west coast. We expect the G-lV to return to Honolulu with a flight centered around 99012300. No C-130 flight is requested for 99012300.

BACKGROUND INFORMATION

NATURE OF UNCERTAIN SYSTEMS: (1) Low pressure waves reaching the northern California coast, producing more than 3 inches of precipitation. (2) Closed surface low, producing up to 3 inches of precipitation over the plains, with potential for flooding. Snow is expected on the northwest side of the low. (3) Low pressure wave reaching the Alaska coast, producing more than an inch of precipitation in the form of snow.

TIME OF UNCERTAIN SYSTEMS: (1) 99012400 (2) 99012312 (3)99012412

LOCATION OF UNCERTAIN SYSTEMS: (1) 37.5N 77.5W (2) 40N 122.5W (3) 60N 147.5W

FLIGHT PLAN BASED ON SENSITIVITY RESULTS FROM: Ensemble Transform technique, using NCEP ensemble from 99012000, and ECMWF ensemble from 99011912 (time windows for calculations: 99012200-99012400, 99012200-99012312, 99012200-99012412

COMMENTS: This flight will sample sensitive areas for the west coast and Alaska weather events. Sensitivity charts and other related information will be available at:
http://wwwt.emc.ncep.noaa.gov/gmb/targobs/target/targetedobs.html

REQUEST FOR G-lV FLIGHT FROM NCEP

ALL COORDINATES ARE IN LAT-LON
ALL TIMES ARE YYMMDDHHMM IN UTC TIME

DATE AND TIME OF REQUEST: 9901201800

DATE AND TIME OF TAKE-OFF: Around 9901212000

COORDINATES OF TURNING POINTS ON FLIGHT:
Honolulu
35N 165W
45N 155W Control time: 9901220045 Z (no later than: 9901220645)
37N 135W
41N 132W
36N 130W
Long Beach, CA (or other airport on the west coast)

DESIRED LEVEL OF DROPSONDE RELEASE: Highest level possible

TOTAL NUMBER OF DROPSONDES REQUESTED: Approximately 25

COORDINATES OF DROPSONDES: At each turning point, plus, on average, one every 15-20 mins between turning points. If a sonde fails, please try to replace it immediately. The most sensitive areas are around 40N 160W and 42N 140W; the frequency of sondes there could be increased to 10-15 mins (and decreased elsewhere, if necessary).

COMMENTS: Mel Shapiro may insert additional high resolution sondes along the track which sondes will not be transmitted in real time. We requested that a C-130 plane fly a dropsonde mission centered at 99012200 along an extended version of North Pacific track #1 (in the area of 52.5N, 173W). We expect the G-lV to return to Honolulu with a flight centered around 99012300. No C-130 flight is requested for 99012300.

BACKGROUND INFORMATION

TIME OF UNCERTAIN SYSTEMS: (1) 99012400 (2) 99012312 (3)99012412

LOCATION OF UNCERTAIN SYSTEMS: (1) 37.5N 77.5W (2) 40N 122.5W (3) 60N 147.5W

COMMENTS: This is a flight jointly planned with Mel Shapiro who takes synopticly oriented observations in the area of the last 3 turning points. Note that the largest sensitivity to the low pressure system over the plain is around 42N, 140W, which is not reached by the flight. Sensitivity charts and other related information will be available at:
http://wwwt.emc.ncep.noaa.gov/gmb/targobs/target/targetedobs.html

REQUEST FOR C-130 FLIGHT FROM NCEP

ALL COORDINATES ARE IN LAT-LON
ALL TIMES ARE YYMMDDHHMM IN UTC TIME

DATE AND TIME OF REQUEST: 9901211800

DATE AND TIME OF TAKE-OFF: Around 9901221900

COORDINATES OF TURNING POINTS ON FLIGHT:
This new track should be considered as North Pacific track #22
Anchorage
53N 172W
57N 178W Control time: 9901230000 (no later than: 9901230600)
62N 175W
57.5N 163W
Anchorage

DESIRED LEVEL OF DROPSONDE RELEASE: Highest level possible

TOTAL NUMBER OF DROPSONDES REQUESTED: Approximately 20

COMMENTS: We requested that the G-lV plane fly a dropsonde mission centered at 99012300, from Long Beach, CA to Honolulu. A flight with one C-130 plane is possible around 99012400. A flight with the G-lV around 99012400 is not likely but possible.

BACKGROUND INFORMATION

NATURE OF UNCERTAIN SYSTEMS: (1) Low pressure wave reaching the northern California coast, producing more than 2 inches of precipitation. (2) Low pressure wave reaching the Alaska coast, producing more than an inch of precipitation in the form of snow. (3) Another precipitation producing low pressure wave hitting the northern California coast, with large forecast uncertainty.

TIME OF UNCERTAIN SYSTEMS: (1) 99012400 (2) 99012400 (3) 99012512

LOCATION OF UNCERTAIN SYSTEMS: (1) 37.5N 122.5W (2) 60N 142.5W (3) 37.5N 122.5W

FLIGHT PLAN BASED ON SENSITIVITY RESULTS FROM: Ensemble Transform technique, using NCEP ensemble from 99012100, and ECMWF ensemble from 99012012 (time windows for calculations: 99012300-99012512, 99012300-99012400, 990112300-99012512

COMMENTS: This flight samples the second and third weather events. Sensitivity charts and other related information will be available at:
http://wwwt.emc.ncep.noaa.gov/gmb/targobs/target/targetedobs.html

REQUEST FOR G-lV FLIGHT FROM NCEP

ALL COORDINATES ARE IN LAT-LON
ALL TIMES ARE YYMMDDHHMM IN UTC TIME

DATE AND TIME OF REQUEST: 9901211800

DATE AND TIME OF TAKE-OFF: Around 9901222000

COORDINATES OF TURNING POINTS ON FLIGHT:
Long Beach
45N 142.5W Control time: 9901230000 Z (no later than: 9901230600)
35N 155W
Honolulu

DESIRED LEVEL OF DROPSONDE RELEASE: Highest level possible

TOTAL NUMBER OF DROPSONDES REQUESTED: Approximately 20-25

COMMENTS: We would like to have the flight centered around 00 Z. If the flight is too long, please move the second turning point toward the southeast. We requested that a C-130 plane fly a dropsonde mission centered at 99012300, in the area of 57N, 172W. A flight with one C-130 plane is possible around 99012400. A flight with the G-lV around 99012400 is not likely but possible.

BACKGROUND INFORMATION

TIME OF UNCERTAIN SYSTEMS: (1) 99012400 (2) 99012400 (3) 99012512

LOCATION OF UNCERTAIN SYSTEMS: (1) 37.5N 122.5W (2) 60N 142.5W (3) 37.5N 122.5W

COMMENTS: This flight samples sensitive areas for all three weather events. Sensitivity charts and other related information will be available at:
http://wwwt.emc.ncep.noaa.gov/gmb/targobs/target/targetedobs.html

REQUEST FOR C-130 FLIGHT FROM NCEP

ALL COORDINATES ARE IN LAT-LON
ALL TIMES ARE YYMMDDHHMM IN UTC TIME

DATE AND TIME OF REQUEST: 9901241800

DATE AND TIME OF TAKE-OFF: Around 9901251900

COORDINATES OF TURNING POINTS ON FLIGHT: North Pacific track #1
Anchorage
54.5N 160W
57N 168W
52.5N 172W Control time: 9901260000 (no later than: 9901260600)
48N 168W
51N 157W
Anchorage

DESIRED LEVEL OF DROPSONDE RELEASE: Highest level possible

TOTAL NUMBER OF DROPSONDES REQUESTED: Approximately 20

COMMENTS: No G-lV flight is requested for 99012600. Either a C-130, or a G-lV flight is possible around 99012700.

BACKGROUND INFORMATION

NATURE OF UNCERTAIN SYSTEMS: (1) Low pressure wave reaching the Alaska coast, producing more than an inch of precipitation in the form of snow. (2) Low pressure wave reaching the northern Washington coast, producing more than 3 inches of precipitation. (3) A possible precipitation producing low pressure wave developing over New Mexico; (4) Low pressure system, with up to 3 inches of precipitation east of the Appalachian

TIME OF UNCERTAIN SYSTEMS: (1) 99012700 (2) 99012812 (3) 99012812 (4) 99012900

LOCATION OF UNCERTAIN SYSTEMS: (1) 60N 140W (2) 50N 125W (3) 35N 110W 40N 87.5W

FLIGHT PLAN BASED ON SENSITIVITY RESULTS FROM: Ensemble Transform technique, using NCEP ensemble from 99012400, and ECMWF ensemble from 99012312 (time windows for calculations: 99012600-99012700, 99012600-99012812, 990112600-99012900

COMMENTS: For longer than 24-hour time windows, the sensitivity results based on the NCEP and ECMWF ensembles differ. The flight plan is based more on guidance using the ECMWF ensemble. Objective sensitivity calculations have been performed on 20 predesigned flight tracks. Sensitivity charts and other related information will be available at:
http://wwwt.emc.ncep.noaa.gov/gmb/targobs/target/targetedobs.html

Please pass to Jon Talbot

REQUEST FOR C-130 FLIGHT FROM NCEP

ALL COORDINATES ARE IN LAT-LON
ALL TIMES ARE YYMMDDHHMM IN UTC TIME

DATE AND TIME OF REQUEST: 9901251800

DATE AND TIME OF TAKE-OFF: Around 9901261800

COORDINATES OF TURNING POINTS ON FLIGHT: Please save this flight track as North Pacific track #23
Anchorage
53N 160W
52N 172W
47N 175W Control time: 9901270000 (no later than: 9901270600)
42.5N 170W
47N 158W
Anchorage

DESIRED LEVEL OF DROPSONDE RELEASE: Highest level possible

TOTAL NUMBER OF DROPSONDES REQUESTED: Approximately 20-25

COORDINATES OF DROPSONDES: At each turning point, plus, on average, one every 30 mins between turning points. If a sonde fails, please try to replace it immediately. The most sensitive area is around the control point; the frequency of sondes there could be increased to 20-25 mins (and decreased elsewhere, if necessary). We ask that if there are enough dropsondes, additional dropsondes be released on the two legs around the control point (for a frequency of every 10-15 mins), but transmit only every second drop (at a frequency of 20-25 mins) from that area in real time.

COMMENTS: No G-lV flight is requested for 99012700. We will likely request a C-130 flight centered around 99012800; a G-lV flight is also possible around 99012800.

BACKGROUND INFORMATION

NATURE OF UNCERTAIN SYSTEMS: (1) The first low pressure wave in a series reaching the Washington-Oregon coast, producing at least 2-3 inches of precipitation within 24 hrs. (2) Low pressure system over the eastern US, with more than 2 inches of precipitation.

TIME OF UNCERTAIN SYSTEMS: (1) 99012900 (2) 99013000, 99013012

LOCATION OF UNCERTAIN SYSTEMS: (1) 47.5N 125W (2) 37.5N 85W, 35N 75W

FLIGHT PLAN BASED ON SENSITIVITY RESULTS FROM: Ensemble Transform technique, using NCEP ensemble from 99012500, and ECMWF ensemble from 99012412 (time windows for calculations: 99012700-99012900, 99012700-99013000, 990112700-99013012

COMMENTS: Objective sensitivity calculations have been performed on 23 predesigned flight tracks. Also, the impact of the data on the forecasts have been estimated. Sensitivity charts and other related information will be available at:
http://wwwt.emc.ncep.noaa.gov/gmb/targobs/target/targetedobs.html

Please pass to Jon Talbot

REQUEST FOR C-130 FLIGHT FROM NCEP

ALL COORDINATES ARE IN LAT-LON
ALL TIMES ARE YYMMDDHHMM IN UTC TIME

DATE AND TIME OF REQUEST: 9901261800

DATE AND TIME OF TAKE-OFF: Around 9901271800

COORDINATES OF TURNING POINTS ON FLIGHT: North Pacific track #23
Anchorage
53N 160W
52N 172W
47N 175W Control time: 9901280000 (no later than: 9901280600)
42.5N 170W
47N 158W
Anchorage

DESIRED LEVEL OF DROPSONDE RELEASE: Highest level possible

TOTAL NUMBER OF DROPSONDES REQUESTED: Approximately 20-25

COORDINATES OF DROPSONDES: At each turning point, plus, on average, one every 30 mins between turning points. If a sonde fails, please try to replace it immediately. The most sensitive area is around the control point; the frequency of sondes there could be increased to 20-25 mins (and decreased elsewhere, if necessary). We ask that if there are enough dropsondes, 6 additional dropsondes be released on the southern leg, between 166W and 160W (for a frequency of every 10-15 mins), but transmit only every second drop (at a frequency of 25 mins or so) from that area in real time.

COMMENTS: No G-lV flight is requested for 99012800. We will likely request a C-130 flight centered around 99012900; a G-lV flight is also possible around 99012900.

BACKGROUND INFORMATION

NATURE OF UNCERTAIN SYSTEMS: (1) Low pressure waves reaching the Washington-Oregon coast, producing 5-7 inches of precipitation. (2) Low pressure wave reaching the northern California coast, producing 2 inches of precipitation.

TIME OF UNCERTAIN SYSTEMS: (1) 99012912-99013012 (2) 99013012

LOCATION OF UNCERTAIN SYSTEMS: (1) 50N 125W (2) 40N 125W

FLIGHT PLAN BASED ON SENSITIVITY RESULTS FROM: Ensemble Transform technique, using NCEP ensemble from 99012600, and ECMWF ensemble from 99012512 (time windows for calculations: 99012800-99012912, -99013000, -99013012; 99012800-99013012)

REQUEST FOR C-130 FLIGHT FROM NCEP

ALL COORDINATES ARE IN LAT-LON
ALL TIMES ARE YYMMDDHHMM IN UTC TIME

DATE AND TIME OF REQUEST: 9901271800

DATE AND TIME OF TAKE-OFF: Around 9901281800

COORDINATES OF TURNING POINTS ON FLIGHT: North Pacific track #18
Anchorage
50N 156W
43N 157W
40N 152W Control time: 9901290000 (no later than: 9901290600)
42N 147W
50N 146W
Anchorage

DESIRED LEVEL OF DROPSONDE RELEASE: Highest level possible

TOTAL NUMBER OF DROPSONDES REQUESTED: Approximately 20-25

COORDINATES OF DROPSONDES: At each turning point, plus, on average, one every 30 mins between turning points. If a sonde fails, please try to replace it immediately. The most sensitive area is south of 52N; the frequency of sondes there could be increased to 20-25 mins (and decreased elsewhere, if necessary). We ask that if there are enough dropsondes, 6-8 additional dropsondes be released on the two legs between 50N 156W and 40N 152W (for a frequency of every 10-15 mins), but transmit only every second drop (at a frequency of 25 mins or so) from that area in real time.

COMMENTS: No G-lV flight is requested for 99012900. We will likely request a C-130 flight centered around 99013000; possible flight track #20. A G-lV flight is also possible around 99013000.

BACKGROUND INFORMATION

TIME OF UNCERTAIN SYSTEMS: (1) 99013000 (2) 99013100

LOCATION OF UNCERTAIN SYSTEMS: (1) 50N 125W (2) 40N 125W

FLIGHT PLAN BASED ON SENSITIVITY RESULTS FROM: Ensemble Transform technique, using NCEP ensemble from 99012700, and ECMWF ensemble from 99012612 (time windows for calculations: 99012900-99013000; 99012900-99013100)

COMMENTS: This flight should also have an impact on a low pressure system developing around 27.5N 80W, around 99013100. Sensitivity charts and other related information will be available at:
http://wwwt.emc.ncep.noaa.gov/gmb/targobs/target/targetedobs.html

REQUEST FOR C-130 FLIGHT FROM NCEP

ALL COORDINATES ARE IN LAT-LON
ALL TIMES ARE YYMMDDHHMM IN UTC TIME

DATE AND TIME OF REQUEST: 9901281800

DATE AND TIME OF TAKE-OFF: Around 9901291800

COORDINATES OF TURNING POINTS ON FLIGHT: North Pacific track #20
Anchorage
45N 149W
42N 148W
40N 141W Control time: 9901300000 (no later than: 9901300600)
45N 137W
50N 140W
Anchorage

DESIRED LEVEL OF DROPSONDE RELEASE: Highest level possible

TOTAL NUMBER OF DROPSONDES REQUESTED: Approximately 20-25

COORDINATES OF DROPSONDES: At each turning point, plus, on average, one every 30 mins between turning points. If a sonde fails, please try to replace it immediately. The most sensitive area is south of 47N; the frequency of sondes there could be increased to 20-25 mins (and decreased elsewhere, if necessary). We ask that if there are enough dropsondes, 8-10 additional dropsondes be released on the two legs between 45N 149W and 40N 141W (for a frequency of every 10-15 mins), but transmit only every second drop (at a frequency of 25 mins or so) from that area in real time.

COMMENTS: This is the last C-130 mission in the Pacific in the 1999 Winter Storm Reconnaissance program. A G-lV flight is also requested for 99013000 into the area of 37N 146W. It is likely we will not request a G-lV flight centered around 99013100.

BACKGROUND INFORMATION

NATURE OF UNCERTAIN SYSTEM: Low pressure wave reaching the northern California coast, producing 2 inches of precipitation.

TIME OF UNCERTAIN SYSTEM: 99013100

LOCATION OF UNCERTAIN SYSTEM: 40N 122.5W

FLIGHT PLAN BASED ON SENSITIVITY RESULTS FROM: Ensemble Transform technique, using NCEP ensemble from 99012800, and ECMWF ensemble from 99012712 (time windows for calculations: 99013000-99013100; 99013000-99020112; 99013000-99020300)

COMMENTS: This flight should also have an impact on a low pressure system developing around 32.5N 80W, around 99020112, and later around 40N 77.5W, at 99020300. Sensitivity charts and other related information will be available at:
http://wwwt.emc.ncep.noaa.gov/gmb/targobs/target/targetedobs.html

REQUEST FOR G-lV FLIGHT FROM NCEP

ALL COORDINATES ARE IN LAT-LON
ALL TIMES ARE YYMMDDHHMM IN UTC TIME

DATE AND TIME OF REQUEST: 9901281800

DATE AND TIME OF TAKE-OFF: Around 9901292000

COORDINATES OF TURNING POINTS ON FLIGHT:
Honolulu
32N 142W
42N 150 Control time: 9901300000 Z (no later than: 9901300600)
Honolulu

DESIRED LEVEL OF DROPSONDE RELEASE: Highest level possible

TOTAL NUMBER OF DROPSONDES REQUESTED: Approximately 20-25

COORDINATES OF DROPSONDES: At each turning point, plus, on average, one every 20 mins between turning points. If a sonde fails, please try to replace it immediately. Additional dropsondes will be released by SCATCAT, but will not be transmitted in real time.

COMMENTS: A C-130 flight is also requested to the area of 42.5N 142.5W. It is likely we will not request a G-lV flight centered around 99013100.

BACKGROUND INFORMATION

NATURE OF UNCERTAIN SYSTEM: Low pressure wave reaching the northern California coast, producing 2 inches of precipitation.

TIME OF UNCERTAIN SYSTEM: 99013100

LOCATION OF UNCERTAIN SYSTEM: 40N 122.5W

FLIGHT PLAN BASED ON: SCATCAT request.

COMMENTS: This flight was designed by SCATCAT and will be charged against SCATCAT hours. The flight goes through an area which is weakly sensitive to the weather feature described above. The strongly sensitive area is to the east of the flight track.

REQUEST FOR G-lV FLIGHT FROM NCEP

ALL COORDINATES ARE IN LAT-LON
ALL TIMES ARE YYMMDDHHMM IN UTC TIME

DATE AND TIME OF REQUEST: 9902011800

DATE AND TIME OF TAKE-OFF: Around 9902022000

COORDINATES OF TURNING POINTS ON FLIGHT:
Honolulu
43N 162W
51N 145W Control time: 9902030100 (no later than: 9902030600)
Seattle

DESIRED LEVEL OF DROPSONDE RELEASE: Highest level possible

TOTAL NUMBER OF DROPSONDES REQUESTED: Approximately 20-25

COORDINATES OF DROPSONDES: At each turning point, plus, on average, one every 20 mins between turning points. If a sonde fails, please try to replace it immediately. The most sensitive area is north of 38N, and east of 130W; the frequency of sondes there could be increased to 15 mins (and decreased elsewhere, if necessary). Mel Shapiro may insert additional dropsondes that will not be transmitted in real time.

COMMENTS: We would like to have the flight centered around 00 Z. We expect that the next flight with the G-lV will be centered around 99020500, and will recover in Anchorage. A flight around 99020600 is also likely; this flight may recover either in Anchorage or Honolulu. In case of an Anchorage recovery, we would fly back the G-lV to Honolulu around 99020700.

BACKGROUND INFORMATION

NATURE OF UNCERTAIN SYSTEMS: (1) Closed surface low reaching the Oregon coast, producing up to 2 inches of precipitation. (2) Low pressure wave reaching the eastern US, possibly developing a snow storm in the northeast.

TIME OF UNCERTAIN SYSTEMS: (1) 99020412 (2) 99020500

LOCATION OF UNCERTAIN SYSTEMS: (1) 42.5N 122.5W (2) 42.5N 80W

FLIGHT PLAN BASED ON SENSITIVITY RESULTS FROM: Ensemble Transform technique, using NCEP ensemble from 99020100, and ECMWF ensemble from 99013112 (time windows for calculations: 99020300-99020400, 99020300-99020412, 99020300-99020500

COMMENTS: Sensitivity charts and other related information will be available at:
http://wwwt.emc.ncep.noaa.gov/gmb/targobs/target/targetedobs.html

Please pass to Sean White

REQUEST FOR G-lV FLIGHT FROM NCEP

ALL COORDINATES ARE IN LAT-LON
ALL TIMES ARE YYMMDDHHMM IN UTC TIME

DATE AND TIME OF REQUEST: 9902031800

DATE AND TIME OF TAKE-OFF: Around 9902041900

COORDINATES OF TURNING POINTS ON FLIGHT:
Spokane
50N 165W Control time: 9902050000 (no later than: 9902050600)
Anchorage

DESIRED LEVEL OF DROPSONDE RELEASE: Highest level possible

TOTAL NUMBER OF DROPSONDES REQUESTED: Approximately 20-25

COORDINATES OF DROPSONDES: At each turning point, plus, on average, one every 20 mins between turning points. If a sonde fails, please try to replace it immediately. The most sensitive area is west of 140W; the frequency of sondes there could be increased to 15 mins (and decreased elsewhere, if necessary). Mel Shapiro may insert additional dropsondes that will not be transmitted in real time.

COMMENTS: We would like to have the flight centered around 00 Z. We expect that the next flight with the G-lV will be centered around 99020600, and will likely recover in Anchorage, though a Honolulu recovery cannot be ruled out. A flight around 99020700 is also likely; this flight would recover in Honolulu.

BACKGROUND INFORMATION

NATURE OF UNCERTAIN SYSTEM: (1) First wave of large-scale low pressure system reaching the Washington-Oregon-northern California coast, producing a total of more than 10 inches of precipitation. This may be the most significant weather event so far this winter.

TIME OF UNCERTAIN SYSTEM: 99020612(-99020700)

LOCATION OF UNCERTAIN SYSTEM: 42.5N 125W

FLIGHT PLAN BASED ON SENSITIVITY RESULTS FROM: Ensemble Transform technique, using ECMWF ensemble from 99020112 (time windows for calculations: 99020500-99020612, 99020500-99020700

COMMENTS: Sensitivity charts and other related information will be available at:
http://wwwt.emc.ncep.noaa.gov/gmb/targobs/target/targetedobs.html

Please pass to Sean White

REQUEST FOR G-lV FLIGHT FROM NCEP

ALL COORDINATES ARE IN LAT-LON
ALL TIMES ARE YYMMDDHHMM IN UTC TIME

DATE AND TIME OF REQUEST: 9902041800

DATE AND TIME OF TAKE-OFF: Around 9902052000

COORDINATES OF TURNING POINTS ON FLIGHT:
Anchorage
44N 165W
38N 152W Control time: 9902060100 (no later than: 9902060600)
Honolulu

DESIRED LEVEL OF DROPSONDE RELEASE: Highest level possible

TOTAL NUMBER OF DROPSONDES REQUESTED: Approximately 20-25

COORDINATES OF DROPSONDES: At each turning point, plus, on average, one every 20 mins between turning points. If a sonde fails, please try to replace it immediately. The most sensitive area is between 55N and 35N latitudes; the frequency of sondes there could be increased to 15 mins (and decreased elsewhere, if necessary). Mel Shapiro will insert additional dropsondes between 45N and 35N that will not be transmitted in real time.

COMMENTS: We would like to have the flight centered around 00 Z. We expect that the next flight with the G-lV will be centered around 99020700, recovering in Honolulu. There can be no flight around 99020800 (hard down day). The following flight may take place around 99021000.

BACKGROUND INFORMATION

NATURE OF UNCERTAIN SYSTEM: A large-scale low pressure system reaching the Washington-Oregon-northern California coast, producing a total of more than 8 inches of precipitation in northern California. This may be one of the most significant weather events so far this winter on the west coast.

TIME OF UNCERTAIN SYSTEM: 99020700

LOCATION OF UNCERTAIN SYSTEM: 42.5N 125W

FLIGHT PLAN BASED ON SENSITIVITY RESULTS FROM: Ensemble Transform technique, using ECMWF ensemble from 99020312 (time window for calculations: 99020600-99020700

COMMENTS: This is a joint flight with SCATCAT. Sensitivity charts and other related information will be available at:
http://wwwt.emc.ncep.noaa.gov/gmb/targobs/target/targetedobs.html

Please pass to Sean White

REQUEST FOR G-lV FLIGHT FROM NCEP

ALL COORDINATES ARE IN LAT-LON
ALL TIMES ARE YYMMDDHHMM IN UTC TIME

DATE AND TIME OF REQUEST: 9902051800

DATE AND TIME OF TAKE-OFF: Around 9902062000

COORDINATES OF TURNING POINTS ON FLIGHT:
Honolulu
38N 160W
45N 168W Control time: 9902070000 (no later than: 9902070600)
37N 172W
Honolulu

DESIRED LEVEL OF DROPSONDE RELEASE: Highest level possible

TOTAL NUMBER OF DROPSONDES REQUESTED: Approximately 20-25

COORDINATES OF DROPSONDES: At each turning point, plus, on average, one every 20 mins between turning points. If a sonde fails, please try to replace it immediately. The most sensitive area is north of 30N; the frequency of sondes there could be increased to 15 mins (and decreased elsewhere, if necessary). Mel Shapiro may insert additional dropsondes that will not be transmitted in real time.

COMMENTS: No flight around 99020800. It is likely we will request the next flight with the G-lV for 99021000 (though a flight around 99020900 cannot be ruled out yet). This flight would recover in Honolulu. The following (and last) flight with the G-lV may be around 99021200 (or 99021300); we may request that this last flight be recovered on the west coast.

BACKGROUND INFORMATION

NATURE OF UNCERTAIN SYSTEM: A low pressure wave reaching the Oregon-California coast, traveling on a large-scale low pressure system, producing a total of 4-5 inches of precipitation in northern California, on top of 5 inches expected from earlier waves. The flight is in support of forecasts for this very significant weather system.

TIME OF UNCERTAIN SYSTEM: 99020800

LOCATION OF UNCERTAIN SYSTEM: 40N 122.5W

FLIGHT PLAN BASED ON SENSITIVITY RESULTS FROM: Ensemble Transform technique, using NCEP ensemble from 99020500 and ECMWF ensemble from 99020312 and 99020412 (time window for calculations: 99020700-99020800

COMMENTS: Sensitivity charts and other related information will be available at:
http://wwwt.emc.ncep.noaa.gov/gmb/targobs/target/targetedobs.html

REQUEST FOR G-lV FLIGHT FROM NCEP

ALL COORDINATES ARE IN LAT-LON
ALL TIMES ARE YYMMDDHHMM IN UTC TIME

DATE AND TIME OF REQUEST: 9902071800

DATE AND TIME OF TAKE-OFF: Around 9902082000

COORDINATES OF TURNING POINTS ON FLIGHT:
Honolulu
40N 161W
45N 152W Control time: 9902090000 (no later than: 9902090600)
38N 148W
Honolulu

DESIRED LEVEL OF DROPSONDE RELEASE: Highest level possible

TOTAL NUMBER OF DROPSONDES REQUESTED: Approximately 20-25

COORDINATES OF DROPSONDES: At each turning point, plus, on average, one every 20 mins between turning points. If a sonde fails, please try to replace it immediately. The most sensitive area is north of 35N; the frequency of sondes there could be increased to 15 mins (and decreased elsewhere, if necessary). Mel Shapiro may insert additional dropsondes that will not be transmitted in real time.

COMMENTS: It is likely we will request the next (and last) flight with the G-lV for 99021000 (though a flight around 99021100 cannot be ruled out yet). This flight would recover in Honolulu.

BACKGROUND INFORMATION

NATURE OF UNCERTAIN SYSTEM: A deep low pressure system over the eastern US producing up to 2 inches of precipitation, potentially leading to severe weather events.

TIME OF UNCERTAIN SYSTEM: 99021200

LOCATION OF UNCERTAIN SYSTEM: 40N 85W

FLIGHT PLAN BASED ON SENSITIVITY RESULTS FROM: Ensemble Transform technique, using NCEP ensemble from 99020700 and ECMWF ensemble from 99020612 (time window for calculations: 99020900-99021200

COMMENTS: This is the first time that no west coast verification region is identified for a flight. For this reason, and also because the time window is relatively long (72 hours) we consider this mission as experimental (despite the fact that it was requested by HPC). Sensitivity charts and other related information will be available at:
http://wwwt.emc.ncep.noaa.gov/gmb/targobs/target/targetedobs.html

REQUEST FOR G-lV FLIGHT FROM NCEP

ALL COORDINATES ARE IN LAT-LON
ALL TIMES ARE YYMMDDHHMM IN UTC TIME

DATE AND TIME OF REQUEST: 9902081800

DATE AND TIME OF TAKE-OFF: Around 9902092000

COORDINATES OF TURNING POINTS ON FLIGHT:
Honolulu
47N 160W
42.5N 147.5W Control time: 9902100100 (no later than: 9902100600)
Honolulu

DESIRED LEVEL OF DROPSONDE RELEASE: Highest level possible

TOTAL NUMBER OF DROPSONDES REQUESTED: Approximately 20-25

COORDINATES OF DROPSONDES: At each turning point, plus, on average, one every 20 mins between turning points. If a sonde fails, please try to replace it immediately. The most sensitive area is north of 36N on all legs; the frequency of sondes there could be increased to 15 mins (and decreased elsewhere, if necessary). Mel Shapiro will insert additional dropsondes that will not be transmitted in real time.

COMMENTS: If the flight is too long, move the first turning point south along 160W. This is a combined flight with SCATCAT. Flight hours for one additional flight may become available in which case we may request a last flight centered around 99021200, recovering on the west coast.

BACKGROUND INFORMATION

NATURE OF UNCERTAIN SYSTEM: Large scale low pressure system bringing heavy precipitation into British Columbia and northwest Washington.A deep low pressure system over the eastern US producing up to 2 inches of precipitation, potentially leading to severe weather events.

TIME OF UNCERTAIN SYSTEM: 99021200

LOCATION OF UNCERTAIN SYSTEM: 50N 125W

FLIGHT PLAN BASED ON SENSITIVITY RESULTS FROM: Ensemble Transform technique, using NCEP ensemble from 99020800 and ECMWF ensemble from 99020712 (time window for calculations: 99021000-99021200

COMMENTS: This flight also covers an area that is moderately sensitive to a deep forecast low over the eastern US around 99021200 (42.5N 85W). Sensitivity charts and other related information will be available at:
http://wwwt.emc.ncep.noaa.gov/gmb/targobs/target/targetedobs.html