OPEN CLASS NATIONALS /Pre-World Gliding Championships

UVALDE, TX; USAContest Day 4: Tuesday, August 9, 2011

World Class Soaring!Fly Safe ... and Enjoy!

Uvalde Sky: SSE Aspect1800 CDT; Monday Afternoon

Del Rio:By Monday Afternoon

Del Rio Raob24-Hr Comparison

South Texas Gulf Coast Sea Breezeat 1800 CDT

500 mb Tuesday Afternoon Forecast

High Pressure AloftH

Water Vapor Satellite

Monday Morning

T

This Morning

Infrared Satellite

Low Cloud BaseDown 100-200 FeetAnd More Extensive

SE Aspect: UvaldeTuesday Morning

Visible Satellite – This Morning

850 mbModel Temp/Moisture

- 30 deg C Area Expanding- Sub-Tropical Moisture West More Extensive

Thunderstorm Outlook(To Right of Lines)

IncreasingThunderstormThreat Area

To West

Surface Plot – 12Z

Pressure Gradient:2.3 mb(-0.4)

Pressure Gradient:2.1 mb(-0.2)

Pressure Gradient:2.9(+0.8)

Del Rio Raob

Del Rio Raob24-Hr Comparison

Corpus Christi Raob

Corpus Christi Raob24-Hour Comparison

BrownsvilleRaob

Forecast Del Rio Sounding (5 PM CDT)

T/DP Trends

Soaring Graphics

Note: Altitudes are AGL Uvalde

Lift Rates –BLIPMAP

Afternoon 21z(4 PM)

Boundary Layer Top

Afternoon 21z(4 PM)

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)

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.

Outook:Wednesday 1 PM CDT

H

Outlook: Height of Boundary Layer

Uvalde

Junction

Laredo

Outlook: Updraft Velocity Wednesday Afternoon

Uvalde

Junction

Laredo

FLIGHT RESTRICTIONS

Temporary Flight RestrictionsTuesday: August 9, 2011

--- No V.I.P.s in Task Area (150mi radius)

--- No other unpublished restrictions (Could be “pop-up” Fire-Fight Restrictions)

OPEN CLASS NATIONALS /Pre-World Gliding Championships

UVALDE, TX; USA

World Class Soaring!Fly Safe ... and Enjoy!