A surface trough formed in the wake of Tropical Storm Isaac and moved across South Central Texas. This trough acted on deep low level moisture to cause scattered thunderstorms one of which produced damaging wind gusts.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS EWX wrote it up.
A surface trough formed in the wake of Tropical Storm Isaac and moved across South Central Texas. This trough acted on deep low level moisture to cause scattered thunderstorms one of which produced damaging wind gusts.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Austin/San Antonio, TX wrote its last area forecast discussion before the first event at Aug 31, 12:01 PM CST, 2 hours 14 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 101 PM CDT FRI AUG 31 2012 .UPDATE... ISOLATED SHOWERS AND THUNDERSTORMS HAVE DEVELOPED ALONG A KILLEEN TO ROCKSPRINGS LINE WHERE TEMPERATURES HAVE RISEN INTO THE MID TO UPPER 90S. HAVE UPDATED THE FORECAST TO INCLUDE ISOLATED SHOWERS AND THUNDERSTORMS OVER THE HILL COUNTRY. HAVE ALSO RE-ESTABLISHED TRENDS TO THE SENSIBLE WEATHER GRIDS. && .PREV DISCUSSION... /ISSUED 1230 PM CDT FRI AUG 31 2012/ AVIATION... VFR CONDITIONS WILL PREVAIL THROUGH THIS AFTERNOON AND EVENING WITH FEW-SCT CU AOA 4KFT. MOISTURE POOLING IN THE LOWER LEVELS AND WARM SFC TEMPS THIS AFTERNOON SHOULD GENERATE ISO SHRA/TSRA GENERALLY ALONG THE I-35 CORRIDOR...BUT LIKELIHOOD AND AREAL COVERAGE ARE TOO LOW TO WARRANT EXPLICIT MENTION IN TAFS. OUTFLOW WINDS OF 25 TO 30 KTS ARE POSSIBLE WITH ANY THUNDERSTORMS WHICH DEVELOP. OTHERWISE SFC WINDS WILL BE SE-SLY 8 TO 12 KTS THIS AFTERNOON DECREASING TO AOB 10 KTS OVERNIGHT. THE GULF MOISTURE ADVECTION SHOULD BE ENOUGH FOR STRATUS TO DEVELOP ALONG AND SOUTHEAST OF THE BALCONES ESCARPMENT OVERNIGHT SO HAVE KEPT MENTION OF MVFR CIGS AOB 2KFT AT KAUS/KSAT/KSSF AFTER 09-10Z/1ST. CURRENTLY ANTICIPATE A RETURN TO VFR CONDITIONS BY 15-16Z/1ST. PREV DISCUSSION... /ISSUED 1115 AM CDT FRI AUG 31 2012/ UPDATE... SMALL CLUSTER OF SHOWERS CONTINUED IN THE SAN ANTONIO TO SEGUIN AREAS WITHIN AN AREA OF THICKER CLOUDS FROM HONDO TO SAN ANTONIO TO AUSTIN. TEMPERATURES HAVE BEEN SLOWER TO WARM UNDER THE CLOUDS WHILE FASTER TO WARM OUTSIDE THE CLOUDS. HAVE ADJUSTED HIGH TEMPERATURES ACCORDINGLY. OTHERWISE...ONGOING SOUTH CENTRAL TEXAS FORECAST IS ON TRACK. PREV DISCUSSION... /ISSUED 706 AM CDT FRI AUG 31 2012/ UPDATE... WE HAVE UPDATED THE FORECAST TO ACCOUNT FOR THE LATEST RADAR TRENDS. DISCUSSION... AN AREA OF LIGHT SHOWERS ALONG THE I-35 CORRIDOR CONTINUES TO SLOWLY DEVELOP THIS MORNING. WE HAVE UPDATED TO FORECAST TO ACCOUNT FOR THE LATEST RADAR TRENDS. ADDITIONAL CONVECTION REMAINS POSSIBLE THIS AFTERNOON AS WELL. GIVEN STRONG HEATING AND HIGH- BASED NATURE OF STORMS...WIND GUSTS AND LIGHTNING STRIKES WILL BE THE MAIN CONCERNS. ALL FORECAST PRODUCTS HAVE BEEN SENT. && .PRELIMINARY POINT TEMPS/POPS... AUSTIN CAMP MABRY 100 76 98 76 98 / 10 10 10 10 - AUSTIN BERGSTROM INTL AIRPORT 97 74 97 74 97 / 10 10 10 10 - NEW BRAUNFELS MUNI AIRPORT 97 74 97 73 97 / 10 10 10 20 - BURNET MUNI AIRPORT 99 75 98 75 97 / 20 10 - - - DEL RIO INTL AIRPORT 103 79 101 79 101 / 10 10 - - - GEORGETOWN MUNI AIRPORT 101 75 96 75 96 / 10 10 10 - - HONDO MUNI AIRPORT 99 72 97 73 97 / 10 10 - 10 - SAN MARCOS MUNI AIRPORT 97 74 97 74 97 / 10 10 10 10 - LA GRANGE - FAYETTE REGIONAL 100 76 95 75 95 / 10 10 30 10 20 SAN ANTONIO INTL AIRPORT 98 77 97 77 98 / 10 10 10 20 - STINSON MUNI AIRPORT 98 75 97 75 98 / 10 10 10 20 - && .EWX WATCHES/WARNINGS/ADVISORIES... NONE. && MESOSCALE/AVIATION...25 SYNOPTIC/GRIDS...04 PUBLIC SERVICE/DATA COLLECTION...31
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 453 AM CDT FRI AUG 31 2012 TXZ171>173-183>194-202>209-217>225-228-011000- LLANO-BURNET-WILLIAMSON-VAL VERDE-EDWARDS-REAL-KERR-BANDERA- GILLESPIE-KENDALL-BLANCO-HAYS-TRAVIS-BASTROP-LEE-KINNEY-UVALDE- MEDINA-BEXAR-COMAL-GUADALUPE-CALDWELL-FAYETTE-MAVERICK-ZAVALA- FRIO-ATASCOSA-WILSON-KARNES-GONZALES-DE WITT-LAVACA-DIMMIT- 453 AM CDT FRI AUG 31 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL TEXAS. .DAY ONE...TODAY AND TONIGHT... ELEVATED FIRE WEATHER CONDITIONS ARE EXPECTED OVER THE SOUTHERN EDWARDS PLATEAU AND RIO GRANDE PLAINS THIS AFTERNOON DUE TO LOW RELATIVE HUMIDITIES. ISOLATED THUNDERSTORMS COULD PRODUCE STRONG WIND GUSTS OVER 40 MPH ACROSS PARTS OF SOUTH CENTRAL TEXAS LATE THIS AFTERNOON AND EARLY THIS EVENING. THE POTENTIAL FOR THE GUSTY THUNDERSTORM WINDS WILL BE GENERALLY SOUTHEAST OF A BURNET TO UVALDE LINE. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY... NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
The Ft Hood radar (KGRK), 75 km away, was scanning. The volume nearest the first event began at 20:15 UTC.
1 thunderstorm wind. Local standard time, as filed.
A thunderstorm produced wind gusts estimated at 58 mph that damaged the underpinning of a mobile home, a porch, a barn, a well house, a fence, and multiple trees.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2012Every state in 2012This day in weather historyWarnings in Texas, August 2012
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 398153.