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OPEN CLASS NATIONALS /Pre-World Gliding Championships
UVALDE, TX; USAContest Day 5: Wednesday, August 10, 2011
World Class Soaring!Fly Safe ... and Enjoy!
Uvalde Sky: SSE Aspect1800 CDT; Tuesday Afternoon
Del Rio:By Tuesday Afternoon
CCL higher than InversionBut Mid-level Moisture Increasing
South Texas at 1830 CDT
-Sea Breeze Diffuse-Note NE Mexico Convection
500 mb Wednesday Afternoon Forecast
High Pressure Aloft
H
Infrared Satellite
Water Vapor Satellite
Monday Morning
T
This Morning
Ceilings SimilarSlightly More Coverage
Visible Satellite – This Morning
SE Aspect: UvaldeWednesday 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 Southwest
Surface Plot – 12Z
Pressure Gradient:2.3 mb(+/-0.0)
Pressure Gradient:1.7 mb(-0.4)
Pressure Gradient:2.5(-0.4)
Del Rio Raob
Del Rio Raob24-Hr Comparison
Uvalde RASP Forecast Sounding
Increased Mid-Level Moisture
Corpus Christi Raob
Corpus Christi Raob24-Hour Comparison
BrownsvilleRaob
Forecast Del Rio Sounding (5 PM CDT)
Slightly Higher Inversion HeightMid-Level Moisture Increasing
T/DP Trends
Soaring Graphics
Note: Altitudes are AGL Uvalde
Lift Rates –BLIPMAP
Afternoon 21z(4 PM CDT)
Lift Rates Slightly Up
BoundaryLayer Top
Afternoon 21z(4 PM CDT)
Inversion Slightly Higher
Soaring Forecast
• Delta-T 850-500: 28(+0.5C)
• 850mb Temp: 23.5C(+0.5)
• K-Index, DRT: 34(+1)
• Launch Clouds: SCT-BKN 5000 Feet MSL
• Task: SCT055 to FEW065…then FEW075 late afternoon
• Maximum Temp 39.5C/103F .. (No Change but delayed)
• Lift Rates: 500-600 FPM (+100 fpm)
• Alt Max/Time: 7,500 Ft (FEW Cu) / 1700 CDT
• Trigger/Time: 35C(95F); 1330 CDT
• Winds: SE 8-15Kt (+/-0)
Wednesday Aug 10 2011- More extensive stratus coverage over the Gulf Coast Plain reflecting closer
to that more “normal” for Uvalde. 24-Hr comparisons of Temp/Dewpointshowed similar in Temperatures and slightly higher dew points (and more cloud cover). Note the included picture of the “morning overcast stratus” at Uvalde. Lower level dew points were up 2-4F and combined with similar temperature readings at or below 8000 feet…contest weather forecast included FEW-SCT cumulus for tasks. Widespread morning low cloudiness gave way to BKN037 at launch of 1315 CDT…by launch end at 1445 CDT clouds were BKN-SCT045. Very hazy conditions with the additional moisture with skies slowly raising to SCT050-060 over the task area during the mid to late afternoon. After 1800 CDT skies become SCT070-075 with active convection moving from the southwest over Del Rio. Convective outflow triggered secondary convection in a line that approached Uvalde by 2000 CDT.
- Time period to run the tasks was limited to the mid to very early evening hours due to the expected late start. Lift rates varied significantly from 3 to 10kts…with “average” reports of 5kts. Pilot skill and experience was demonstrated by their “shifting gears” around the task area as lift conditions varied. The variability of the lift was assisted by cumulus that provided consistent thermal markers. Reports of altitudes reached were 7000 to 7500 feet MSL…primarily around 7000 feet. The convection that fired off early in the evening was not a factor but will again occur for the Uvalde area tomorrow…a called rest day.
Wednesday Afternoon Sky, UvaldeEast Aspect: 1600 CDT
- Afternoon Thunderstorm at 1830CDT over Del Rio- Early Evening Cumulus Field from Cotulla (COT)NNW to Edwards County (ECU) over the Uvalde Task Area
Thunderstorm over Del Rio west of Uvalde(West Aspect 1900 CDT; Wed, Aug 10, 2011)
Outook:Thursday 1 PM CDT
H
700 mbHeight/Moisture
Moisture Increasing Over West Texas
FLIGHT RESTRICTIONS
Temporary Flight RestrictionsWednesday: August 10, 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!
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