Flight Number: 970110H1 Page of
Date: Jan 10 1997 Aircraft ID: 42 Scientist: Jorgensen
Event Log
Time Position (Lat, Event & Comments
(UTC) Lon)
02:05 SHANNON BLOCKOUT
02:11 SHANNON Take off
2:19:33 52.977 -9.448 Climb out
2:22:18 Metman and 308D contact
2:25:33 Metman extimates their IP at 3:20 UTC, about 10 min
ahead
2:41:57 53.818 -11.773 308D TO at 2:14
2:43:21 53.869 -11.922 LF radar being worked on
2:55:11 54.430 -13.108 LF radar back up
3:03:28 55.052 -13.531 No return on TA, ETA to Buoy 0315
3:16:11 55.976 -14.179 Over buoy - turn to track to pt 1
3:22:59 56.012 -14.990 Entered NOTAM area turning to pt 1
3:26:19 Appears to be a tilt bias in LF 0 to left, +5 to
right
3:30:14 308D estimates their point 1 at 0402 ours is 0346
3:32:57 308D entered Ops area at 0331
3:38:44 55.129 -15.884 Begin descent to point 1
3:45:09 54.775 -16.248 Precip bands 20 miles ahead 30 dBZ max
3:47:21 54.662 -16.373 At IP pearl in good precip until 308D gets to their
IP
3:53:09 54.720 -16.389 Having to correct back to the south due to 40 knot S
wind
4:04:55 54.706 -16.450 At Pt. 1 track to point 2 on leg 1
4:06:37 LF tilt appears more stable
4:13:52 55.060 -17.406 Appear to be tracking between two bands of precip
4:17:20 55.187 -17.788 Entering pearl
4:20:05 55.230 -17.793 End pearl
4:25:21 55.386 -18.371 Precip intensity increasing
4:33:53 55.687 -19.341 Start pearl precip only about 25 dBZ
4:36:25 Still leading 308 by several minutes
4:37:19 55.725 -19.426 End of pearl
4:45:29 308D climbing to 15kft to see if static charging
reduces and improves data system problems
4:49:22 56.142 -20.797 Precip intensity increasing - specks of 40 dBZ on LF
4:50:30 56.181 -20.921 Start pearl wind speed decreasiing as we go west.
4:54:45 56.232 -21.078 End pearl
4:58:59 56.354 -21.557 Radar data system down for a minute or so
5:02:25 56.462 -21.943 Convective looking cells to our south 10-20 km
5:07:27 56.612 -22.499 End of leg - start pearl
5:12:18 56.532 -22.612 End of pearl - track to point 3
5:33:00 55.314 -23.370 At point 3 - pearl - apparent dry slot 20 miles ahead
5:35:19 Slight fore/aft bias in LF tilt?
5:37:40 55.290 -23.208 End of pearl - track 095 to point 4
5:51:48 55.141 -21.588 Start pearl - precip fairly heavy (25-30 dBZ) and
very stratiform
5:55:44 55.127 -21.493 End of pearl
6:05:49 54.991 -20.400 winds picking back up again 112/27 knts - sfc
pressure dropped 2-3 mb during this leg - echo tops
4-5 km above
6:12:15 54.918 -19.768 Begin pearly - sfc press now 985 mb
6:16:16 54.935 -19.716 End of the pearl
6:18:22 54.901 -19.522 penetratiing 45 dBZ cells
6:27:23 54.767 -18.652 now in very light precip - no pearl due to lack of
echo
6:34:50 playing with the LF tilt to figure out biases
6:39:09 54.593 -17.469 small shallow (1-2 km tops) convective looking cells
across track - temps higher by 2-3 degrees during
this run
6:41:27 54.555 -17.241 sfc press now rising again to 988 mb
6:47:04 308D end of pattern - return to base
6:48:03 54.447 -16.568 end of leg-At point 4 - no pearl tracking 203 toward
pt 5
7:11:32 tinkering with LF
7:14:07 Coordinating run with METMAN
7:16:47 53.064 -17.485 At point 5 turn to track east to point 6
7:27:37 53.348 -18.311 Precip ~30 miles ahead - good coordination with
METMAN
7:36:32 53.596 -19.027 Not much precip - apparently echo seen earlier was
sea clutter- about a 40 knot headwind
7:46:47 53.847 -19.812 Passing to the left of some small shallow convection
7:54:32 54.054 -20.404 Passing just to the west of a small, intense
convective line. Max dBZ is 35-39
8:02:22 METMAN reports repidly decreasing winds
8:09:40 METMAN reports very dry conditions at end of leg -
probably will have GPS sondes by end of next week
8:22:59 Scatterometry seems to have a heat related problem,
bad data when it gets hot.
8:28:51 54.968 -23.523 End of leg, at pt 6 turning to track to pt 7.
8:38:29 54.411 -23.877 dawn breaking to east
8:39:24 54.348 -23.914 At point 7, turn to track to point 8
9:33:43 53.499 -17.185 At point 8, end of pattern climb to cruise altitude
for ferry back to Shannon.
9:39:00 53.656 -16.454 At 584 mb winds 258 at 84 knots
10:25:27 52.848 -10.132 Start descent into Sannon
10:40 SHANNON Land
10:46:21 Shannon BLOCK IN