Thunderstorms formed in the vicinity of a stationary front and moved toward the south southwest. When they interacted with the sea breeze, one storm became severe.
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.
Thunderstorms formed in the vicinity of a stationary front and moved toward the south southwest. When they interacted with the sea breeze, one storm became severe.
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 21, 5:41 PM CST, 1 hour 59 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 641 PM CDT FRI AUG 21 2009 .DISCUSSION... SEE AVIATION DISCUSSION BELOW. && .AVIATION... ISOLATED CONVECTION CENTERED ROUGHLY ALONG A SJT-AUS-GLS AXIS WILL MOVE TOWARD THE I-10 CORRIDOR THROUGH 03Z, BUT SHOULD BE WEAKENING BY THAT TIME. LATEST NAM/RUC RUNS KEEP ACTIVITY LINGERING LATER INTO THE EVENING, SO WILL INTRODUCE SOME A CB CLOUD GROUP FOR SAT/SSF TERMINALS. ABUNDANT DEBRIS CLOUDS FROM THIS CONVECTION WILL REMAIN OVER THE AREA AND SPILL IN FROM ADDITIONAL CONVECTION FROM THE WEST. THIS WILL AGAIN DISRUPT THE FORMATION OF LOW LEVEL CEILINGS THAT WILL TRY TO FORM IN THE 09Z-15Z WINDOW. WHILE RAIN CHANCES REMAIN VERY LOW FOR SATURDAY, SOME ISOLATED CB GROUPS WERE CONSIDERED FOR LATE IN THE DAY AS THE NAM MODEL FORECAST MOISTURE AXIS AND RIDGE POSITIONING LOOKS VERY COMPARABLE TO THAT OF THIS AFTERNOON. SATURDAY WINDS FORECAST FOR THE I-35 TERMINALS IS ALSO BIT LIGHTER AND MORE EASTERLY IN DIRECTION THAN SUGGESTED BY GUIDANCE NUMBERS. && .PREV DISCUSSION... /ISSUED 252 PM CDT FRI AUG 21 2009/ DISCUSSION... A WEAK BOUNDARY OVER CENTRAL TEXAS..A FOCUS OF THIS AFTERNOONS WITHERING CONVECTION, MAY PROPAGATE INTO NORTHERN CWA THIS EVENING BUT RIDGING ALOFT WILL LIMIT FUTURE DEVELOPMENT. ONLY ISOLATED EVENING STORMS FORECAST ROUGHLY NORTHEAST OF A LINE FROM MOUNTAIN HOME TO CUERO. HOT TOMORROW AND SUNDAY AS RIDGE ALOFT SETTLES IN. DEEP EASTERLIES WILL BEGIN ENTERING THE PICTURE MONDAY WITH HEIGHTS ALOFT LOWERING AND HIGH TEMPERATURES A LITTLE LOWER THAN WHAT THEY HAVE BEEN. BY WEDNESDAY, AN INVERTED TROUGH WILL PUSH ASHORE BUT INITIALLY MAY ONLY AFFECT COASTAL AREAS. SEA BREEZE CONVECTION MAY DEVELOP OVER THE EASTERN CWA THURSDAY AND FRIDAY AS A WEAK LOW ALOFT MEANDERS OVER THE CENTRAL TEXAS GULF COAST REGION. && .PRELIMINARY POINT TEMPS/POPS... AUSTIN CAMP MABRY 78 102 78 101 75 / 10 - 10 10 10 AUSTIN BERGSTROM INTL AIRPORT 76 103 74 102 74 / 10 - 10 10 10 NEW BRAUNFELS MUNI AIRPORT 75 101 73 100 72 / 10 - 10 - 10 BURNET MUNI AIRPORT 76 99 75 99 75 / 10 - 10 - 10 DEL RIO INTL AIRPORT 79 103 79 104 77 / - - - - - GEORGETOWN MUNI AIRPORT 78 100 76 101 74 / 10 - 10 10 10 HONDO MUNI AIRPORT 76 101 75 100 73 / - - - - - SAN MARCOS MUNI AIRPORT 76 102 74 100 73 / 10 - 10 - 10 LA GRANGE - FAYETTE REGIONAL 77 100 73 98 72 / 20 - 10 10 10 SAN ANTONIO INTL AIRPORT 78 101 78 101 77 / 10 - - - 10 STINSON MUNI AIRPORT 77 102 76 102 74 / - - - - 10 && .EWX WATCHES/WARNINGS/ADVISORIES... NONE. && 11/18
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 526 AM CDT FRI AUG 21 2009 TXZ171>173-183>194-202>209-217>225-228-221030- 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- 526 AM CDT FRI AUG 21 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL TEXAS. .DAY ONE...TODAY AND TONIGHT... NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY... NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 758 PM CDT FRI AUG 21 2009 TXZ225-220200- LAVACA- 758 PM CDT FRI AUG 21 2009 ...A STRONG THUNDERSTORM WAS AFFECTING LAVACA COUNTY... AT 758 PM CDT...NWS METEOROLOGISTS ARE TRACKING A STRONG THUNDERSTORM 6 MILES EAST OF SUBLIME...OR 14 MILES EAST OF HALLETTSVILLE...MOVING SOUTHWEST AT 10 MPH. PEOPLE IN LAVACA COUNTY...INCLUDING THE FOLLOWING LOCATIONS... EZZELL...SHOULD MONITOR THE WEATHER SITUATION CLOSELY. LISTEN FOR POSSIBLE WARNINGS AND BE PREPARED TO TAKE APPROPRIATE ACTION SHOULD SEVERE WEATHER THREATEN. SMALL HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS STORM.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 759 PM CDT FRI AUG 21 2009 TXZ208-209-223-220200- CALDWELL-FAYETTE-GONZALES- 759 PM CDT FRI AUG 21 2009 ...A STRONG THUNDERSTORM WAS AFFECTING CALDWELL...FAYETTE AND GONZALES COUNTIES... AT 758 PM CDT...NWS METEOROLOGISTS ARE TRACKING A STRONG THUNDERSTORM 8 MILES WEST OF WAELDER...OR 13 MILES NORTH OF GONZALES...MOVING SOUTHWEST AT 10 MPH. PEOPLE IN NORTHERN GONZALES...SOUTHEASTERN CALDWELL AND SOUTHWESTERN FAYETTE COUNTIES...SHOULD MONITOR THE WEATHER SITUATION CLOSELY. LISTEN FOR POSSIBLE WARNINGS AND BE PREPARED TO TAKE APPROPRIATE ACTION SHOULD SEVERE WEATHER THREATEN. SMALL HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS STORM.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 834 PM CDT FRI AUG 21 2009 TXZ209-220230- FAYETTE- 834 PM CDT FRI AUG 21 2009 ...A STRONG THUNDERSTORM WAS AFFECTING FAYETTE COUNTY... AT 834 PM CDT...NWS METEOROLOGISTS ARE TRACKING A STRONG THUNDERSTORM NEAR ROUND TOP...OR 16 MILES EAST OF GIDDINGS...MOVING SOUTHWEST AT 5 MPH. PEOPLE IN NORTHEASTERN FAYETTE COUNTY...INCLUDING THE FOLLOWING LOCATIONS...ROUND TOP...SHOULD MONITOR THE WEATHER SITUATION CLOSELY. LISTEN FOR POSSIBLE WARNINGS AND BE PREPARED TO TAKE APPROPRIATE ACTION SHOULD SEVERE WEATHER THREATEN. SMALL HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS STORM.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 838 PM CDT FRI AUG 21 2009 TXZ208-223>225-220230- CALDWELL-DEWITT-GONZALES-LAVACA- 838 PM CDT FRI AUG 21 2009 ...STRONG THUNDERSTORMS WERE AFFECTING CALDWELL...DEWITT...GONZALES AND LAVACA COUNTIES... AT 837 PM CDT...NWS METEOROLOGISTS ARE TRACKING STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 6 MILES NORTHEAST OF LULING TO 5 MILES EAST OF YOAKUM...MOVING SOUTH AT 10 MPH. PEOPLE IN GONZALES...NORTHEASTERN DEWITT...SOUTHERN CALDWELL AND SOUTHWESTERN LAVACA COUNTIES...SHOULD MONITOR THE WEATHER SITUATION CLOSELY. LISTEN FOR POSSIBLE WARNINGS AND BE PREPARED TO TAKE APPROPRIATE ACTION SHOULD SEVERE WEATHER THREATEN. SMALL HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THESE STORMS.
The Austin/San Antonio radar (KEWX), 116 km away, was scanning. The volume nearest the first event began at 01:40 UTC.
1 thunderstorm wind. Local standard time, as filed.
An isolated severe thunderstorm produced wind gusts, estimated at 45 knots, that damaged the roofs of several homes near FM 530.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2009Every state in 2009This day in weather historyWarnings in Texas, August 2009
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: 188892.