Morning weather forecast and afternoon report by Dan Gudgel for the 2011 Pre-World Gliding Championship in Uvalde, TX

1. OPEN CLASS NATIONALS /
Pre-World Gliding Championships
UVALDE, TX; USA
Contest Day 4: Tuesday, August 9, 2011
World Class Soaring!
Fly Safe ... and Enjoy!

2. Uvalde Sky: SSE Aspect
1800 CDT; Monday Afternoon

3. Del Rio:
By Monday
Afternoon

4. Del Rio Raob 24-Hr Comparison

5. South Texas Gulf Coast Sea Breeze
at 1800 CDT

6. 500 mb Tuesday Afternoon Forecast
H
High Pressure Aloft

7. Water
Vapor
Satellite T
Monday Morning
This Morning

8. Infrared
Satellite

9. Low Cloud Base
Down 100-200 Feet
And More Extensive

10. SE Aspect: Uvalde
Tuesday Morning

11. Visible Satellite – This Morning

12. 850 mb Model Temp/Moisture
- 30 deg C Area Expanding
- Sub-Tropical Moisture West More Extensive

13. Thunderstorm Outlook
(To Right of Lines)
Increasing
Thunderstorm
Threat Area
To West

14. Surface Plot – 12Z
Pressure Gradient:
2.1 mb(-0.2)
Pressure Gradient:
2.3 mb(-0.4)
Pressure Gradient:
2.9(+0.8)

15. Del Rio
Raob

16. Del Rio Raob 24-Hr Comparison

17. Corpus
Christi
Raob

18. Corpus Christi Raob 24-Hour Comparison

19. Brownsville
Raob

20. Forecast Del Rio Sounding (5 PM CDT)

21. T/DP
Trends

22. Soaring
Graphics
Note: Altitudes are
AGL Uvalde

23. Lift Rates –
BLIPMAP
Afternoon
21z(4 PM)

24. Boundary
Layer Top
Afternoon
21z(4 PM)

25. Soaring Forecast (at pilot brief)
• Delta-T 850-500: 28(+1C) 850mb Temp:
23C(+1C)
• K-Index, DRT: 33(No Chg)
• Launch Clouds: SCT-FEW 4000 Feet MSL
• Task: FEW050 to Clear MSL…Becoming
FEW075 last of the afternoon.
• Maximum Temp 39.5C/103F .. (Up 1 deg C)
• Lift Rates: 400-500 FPM (500-600 Better)
• Alt Max/Time: 7,200 Ft (blue) / 1700 CDT
• Trigger/Time: 35C(95F); 1300 CDT
• Winds: SE 8-15Kt (-2)

26. Tuesday Aug 9 2011
- The Experimental Low Clouds/Fog Product this morning showing more extensive
coverage over the Gulf Coast Plain than yesterday but still not filled in per
“normal” Uvalde conditions. 24-Hr T/DP similar with minor variations in DP.
Note the included picture of the “morning stratus” at Uvalde. While the cloud field
and low-level moisture looked promising…the upper air is drying under subsidence
as the Southwest U.S. High Pressure moves back eastward. By launch at 12:45 PM
CDT, the cloud field had lifted to SCT035 and does appear to be drying.
- Soaring forecasts for the day seem to indicate “blue” soaring with only moderate
heights and lift. Racing tasks are assigned for 3 to 4 hours flying.

27. H
Outook:
Wednesday 1 PM CDT

28. Outlook:
Height of
Boundary
Layer Junction
Uvalde
Laredo

29. Outlook:
Updraft
Velocity
Wednesday Junction
Afternoon
Uvalde
Laredo

30. FLIGHT RESTRICTIONS
Temporary Flight Restrictions
Tuesday: August 9, 2011
--- No V.I.P.s in Task Area (150mi radius)
--- No other unpublished restrictions (Could
be “pop-up” Fire-Fight Restrictions)

31. OPEN CLASS NATIONALS /
Pre-World Gliding Championships
UVALDE, TX; USA
World Class Soaring!
Fly Safe ... and Enjoy!