1. 24 May 2002 WCR & KA data VPDD: Low SSP up:
19: m AGL: dryline below
19:14 Z descending from 2000 m to 1500 m AGL: intercept the cold front in a 180 degree turn. Cold front is 16 km to the WNW of dryline
19: m AGL: dryline below
19: m AGL: dryline below
19: m AGL: cold front, 14 km to the WNW of dryline
Low SSP up:
19: m AGL: cold front and dryline, separated some 11 km (10 km at corrspndg angle)
19: m AGL: cold front and dryline, separated by 3-4 km
20: m AGL: cold front and dryline, separated by 1-2 km
20: m AGL: cold front and dryline collapsed (wind synthesized)
20: m AGL
20: m AGL: cold front has surged under the dryline
20: m AGL; cold front has surged under the dryline
20: m AGL
21: m AGL: cold front, about 9 km behind deep-convective initiation
(estimated frontal speed relative to dryline : 6-7 m/s)

2. 19:10 Z
Moist side sounding:
cold front
16 km
dryline
Ground ~650 m high
Clouds between m AGL

3. nadir beam
ESE
110
19:10:09-
19:11:20
WSW
290
dryline
Time match correct

4. 19:14 Z
cold front
Cold front
Cold front SE NW SE NW
19:13: :15:22
nadir beam

5. 19:18 Z
Flight level: ~1500 m AGL
Wind shift

6. Ahead of cold front, in the dry sector??
Dryline?
Moist air
nadir beam
WSW
290
Dryline?
Time match correct
ESE
110
cold
front?

7. 19:29-19:32 Z
cold front
dryline

8. cold frontal surface @900 m
dry sector thermal ??
dryline
cold frontal m
foreward beam!!!
WSW
290
14 km
ESE
110
Moist air
Cold air

9. Low SSP up 360 m 360 m 170 m cold front @ 360m 170 m @ 19:35
@ 19:49
dryline
@ 170m
@ 19:48
cold front
cold front
dryline
dryline

10. UWKA
19:33
19:52
19:43

11. cold front q q NW 315 SE 135 Height above frontal motion flight level
flight level: 360 m AGL
total length: 11.2 km
aspect ratio: 1:1
Relative humidity
cold front
Mixing ratio
superplot,193320,193530,xvars=['mrlaf','rh','thetad','thetae'],radarch='hh',ngraphs=3,/timeax,/transpose,/landsc,/timein,color=41 q q e

12. cold front SE NW NW 315 SE 135 frontal motion kft km
Height above flt level
total length: 5.9 km
flight level: 360 m AGL NW SE
convergence!
ascent

13. cold frontal surface @360 m
frontal motion SE
135 NW
315
cold frontal m u
m/s v
m/s

14. cold frontal surface @360 m dryline 11 km Time matched OK v m/s
westerly
southerly
northerly u
m/s

15. Attenuated??

16. superplot_old,194600,195030,xvars=['mrlaf','trf','thetad','thetae'],radarch='hh',ngraphs=3,/timeax,/transpose,/landsc,/timein,color=41,wcr_avg=9,/no_AR

17. 20:00 Z
VPDD
Flight level: ~2300 m AGL

18. WNW 290 ESE 110 frontal motion 19:59:08-20:02:38 front Dryline?
Moist air
WNW
290
ESE
110

19. 20:10 Z
VPDD
Flight level: ~2300 m AGL
cold front below
@ 20:09 Z

20. SSE 164 NNW 344 frontal motion front & dryline moist air cold air
Time match OK

21. dBZ Height below flight level (m) Time (UTC) WCR nadir antenna
reflectivity
Flight level: 2300 m AGL
dBZ
Aspect ratio : 2:1

23. 20:25 Z VPDD Flight level: ~1200 m AGL cold front below @ 20:25 Z
descending to 170 m

24. WNW 344 ESE 164 km possibly stratus clouds frontal motion
20:21:50-20:25:40
WNW
344
front
ESE
164

25. cold front
@ 170m
@ 20:46
cold front
@ 170m
@ 20:28

26. -5
SSE
164
frontal motion
NNW
344 km
dBZ 6 8
-45
Total length: 11.7 km, flight level: 170 m

27. km vertical velocity NW 300 SE 120
frontal motion SE
120
Total length: 11.7 km, flight level: 170 m
vertical velocity

28. 20:54 Z VPDD Flight level: ~1200 m AGL cold front below around 20:54 Z
ascending from 170 m

29. ESE 110 WNW 290 frontal motion 20:51:58-20:56:28
Embryo of a Cb cell that develops here in the next 15 min?
WNW
290
Dry air above the cold front
Not sure about time match
Moist air ahead of dryline
If the air ahead of the sharp gradient is drier and warmer, why does it seem to have a cloud at flight level?

30. 21:11 Z VPDD Flight level: ~2400 m AGL Last leg
First cumulonimbus formation (~21:12:30)
cold front below
around 21:11 Z
(ascending after this time)

31. 21:06:36-21:13:20
WNW
290
Gravity waves in the cold-frontal stratus?
Questionable (dixit Sam)
frontal motion
ESE
110
This is a cloud whose towering tops had grown well above 4 km AGL, part of a line of storm cells aligned with the cold front
9 km
Deep convection develops 9 km ahead of sfc cold front

32. UWKA
AMA
21:05
21:15