A very hot day in South Central Texas made the atmosphere conditionally unstable and a weak moisture convergence boundary added enough lift to produce thunderstorms. Some of these storms 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 very hot day in South Central Texas made the atmosphere conditionally unstable and a weak moisture convergence boundary added enough lift to produce thunderstorms. Some of these storms 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 10, 3:48 PM CST, 2 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 448 PM CDT FRI AUG 10 2012 .UPDATE... TEXT PRODUCTS AND GRIDS UPDATED FOR SVR TSTM WATCH 572. PRIMARY THREAT WILL BE DAMAGING WIND GUSTS. $& .PREV DISCUSSION... /ISSUED 240 PM CDT FRI AUG 10 2012/ DISCUSSION... WITHIN THE PAST COUPLE OF HOURS...ISOLATED TO SCATTERED CU CLOUDS HAVE FORMED ACROSS THE HILL COUNTRY/ESCARPMENT AREA AND ALONG THE COASTAL PLAINS OF SOUTHEAST TEXAS. MAXIMUM TEMPERATURES ACROSS SOUTH CENTRAL TEXAS TO REACH THE LOWER TO MID 100S AND NEAR 100 OVER THE HILL COUNTRY. IT'S GOING TO FEEL EVEN HOTTER AROUND 3 PM TO 6 PM AS HEAT INDEX VALUES NEAR THE 105 MARK. AS THE AFTERNOON PROGRESSES...ISOLATED SHOWERS AND THUNDERSTORMS ARE POSSIBLE ACROSS THE HILL COUNTRY WHILE MOVING SOUTHWARD ACROSS TWO THIRDS OF SOUTH CENTRAL TEXAS LATE THIS AFTERNOON AND PART OF THE EVENING. IF THESE STORMS DO FORM...AS A CONVERGENCE ZONE SETS UP ACROSS THE HILL COUNTRY...COUPLED WITH HOT CONDITIONS...STRONG WINDS OF 40 TO 50 MPH ARE POSSIBLE AS THE STORM DOWNDRAFT RUSHES TO THE SURFACE. AFTER THIS EVENING...CHANCES FOR RAIN WILL BE LIMITED TO NIL AS UPPER LEVEL RIDGE REGAINS CONTROL OF SOUTH CENTRAL TEXAS WEATHER CONDITIONS FOR THE NEXT SEVERAL DAYS. THE UPCOMING WEEKEND IS GOING TO BE HOT AND DRY WITH SATURDAY AND SUNDAY HIGHS EXPECTED TO BE NEAR AND ABOVE TRIPLE DIGITS. DRY CONDITIONS ARE ANTICIPATED MONDAY AND TUESDAY AND NOT AS HOT. THE UPPER RIDGE IS PROGGED TO WEAKEN BY THE MIDDLE OF NEXT WEEK AS IT SHIFTS SOUTHEASTWARD AND OVER EAST TEXAS BY WEDNESDAY THROUGH FRIDAY. THIS WILL ALLOW TROPICAL MOISTURE TO MOVE ACROSS THE COASTAL PLAINS AND SOUTH CENTRAL TEXAS FOR A SLIGHT CHANCE OF SHOWERS OR THUNDERSTORMS FROM THE SECOND PART OF NEXT WEEK INTO NEXT SATURDAY. FIRE WEATHER... WITH HIGH TEMPERATURES TRENDING A FEW DEGREES HOTTER THAN EXPECTED... COUPLED WITH A CONVERGENCE ZONE ALONG THE ESCARPMENT...ISOLATED THUNDERSTORMS COULD PRODUCE STRONG WIND GUSTS AND OUTFLOWS LATE THIS AFTERNOON AND THIS EVENING. WITH LOW COVERAGE WILL CONSIDER THIS AS ELEVATED FIRE WEATHER CONDITIONS...ALONG WITH THE ONGOING TRENDS OF LATE AFTERNOON DRYNESS AND EARLY EVENING WIND MAXIMUMS. && .PRELIMINARY POINT TEMPS/POPS... AUSTIN CAMP MABRY 76 102 76 100 75 / 10 - - - 10 AUSTIN BERGSTROM INTL AIRPORT 73 102 73 100 73 / 10 - - - 10 NEW BRAUNFELS MUNI AIRPORT 73 102 73 99 72 / 20 - - - - BURNET MUNI AIRPORT 74 102 76 102 75 / - - - - - DEL RIO INTL AIRPORT 80 106 81 106 80 / 10 - - - - GEORGETOWN MUNI AIRPORT 74 101 76 100 75 / - - - - 10 HONDO MUNI AIRPORT 74 103 74 101 72 / 20 - - - - SAN MARCOS MUNI AIRPORT 74 103 73 100 73 / 10 - - - 10 LA GRANGE - FAYETTE REGIONAL 76 101 77 97 77 / 20 10 - 10 10 SAN ANTONIO INTL AIRPORT 77 103 77 100 76 / 10 - - - - STINSON MUNI AIRPORT 76 105 75 102 74 / 20 - - - - && .EWX WATCHES/WARNINGS/ADVISORIES... NONE. && MESOSCALE/AVIATION...04 SYNOPTIC/GRIDS...13 PUBLIC SERVICE/DATA COLLECTION...33
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 434 PM CDT FRI AUG 10 2012 TXZ171>173-183>194-202>209-217>225-228-111200- 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- 434 PM CDT FRI AUG 10 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL TEXAS. .DAY ONE...LATE THIS AFTERNOON AND TONIGHT... ISOLATED STRONG TO SEVERE THUNDERSTORMS ARE EXPECTED LATE THIS AFTERNOON INTO THIS EVENING...ACROSS ALL BUT EXTREME NORTHERN PARTS OF SOUTH CENTRAL TEXAS. THE MAIN THREAT WILL BE DAMAGING WIND GUSTS OF 40 TO 60 MPH. SMALL HAIL IS ALSO POSSIBLE. ISOLATED THUNDERSTORMS WITH BRIEF WIND GUSTS OF 4O TO 60 MPH COULD MAKE WILDFIRES DIFFICULT TO CONTROL. ELEVATED FIRE WEATHER CONDITIONS ARE EXPECTED THIS AFTERNOON INTO EARLY THIS EVENING ACROSS THE RIO GRANDE PLAINS AND SOUTHERN EDWARDS PLATEAU DUE TO LOW RELATIVE HUMIDITIES. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY... ELEVATED FIRE WEATHER CONDITIONS ARE EXPECTED SATURDAY THROUGH TUESDAY AFTERNOONS INTO EARLY EACH EVENING ACROSS THE RIO GRANDE PLAINS AND SOUTHERN EDWARDS PLATEAU DUE TO LOW RELATIVE HUMIDITIES. CONDITIONS MAY APPROACH HEAT ADVISORY CRITERIA BOTH SATURDAY AND SUNDAY AFTERNOONS ALONG THE RIO GRANDE PLAINS. .SPOTTER INFORMATION STATEMENT...
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 336 PM CDT FRI AUG 10 2012 TXZ193-194-102100- BASTROP-LEE- 336 PM CDT FRI AUG 10 2012 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN BASTROP AND WESTERN LEE COUNTIES UNTIL 400 PM CDT... AT 329 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM 9 MILES WEST OF FEDOR...OR 11 MILES EAST OF ELGIN...MOVING SOUTH AT 15 MPH. WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... PAIGE... CIRCLE D-KC ESTATE... CAMP SWIFT... MCDADE... IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 418 PM CDT FRI AUG 10 2012 TXZ191-206-102145- COMAL-HAYS- 418 PM CDT FRI AUG 10 2012 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN COMAL AND WESTERN HAYS COUNTIES UNTIL 445 PM CDT... AT 413 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM 5 MILES NORTHEAST OF FISCHER...OR 7 MILES WEST OF WIMBERLEY...MOVING SOUTH AT 20 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... WIMBERLEY... CANYON LAKE DAM... FISCHER... CANYON CITY... SATTLER... STARTZVILLE... THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS... FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE. THE HEAVY RAIN MAY FLOOD LOW LYING AREAS SUCH AS DITCHES...LOW WATER CROSSINGS AND UNDERPASSES. DO NOT DRIVE YOUR VEHICLE ACROSS FLOODED ROADWAYS.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 441 PM CDT FRI AUG 10 2012 TXZ189-190-206-102230- BLANCO-COMAL-KENDALL- 441 PM CDT FRI AUG 10 2012 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN COMAL...SOUTHWESTERN BLANCO AND EASTERN KENDALL COUNTIES UNTIL 530 PM CDT... AT 438 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM 5 MILES SOUTHWEST OF BLANCO...MOVING SOUTH AT 10 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... TWIN SISTERS... KENDALIA... GUADALUPE RIVER STATE PARK... SPRING BRANCH... BERGHEIM... ANHALT... THIS STORM MAY INTENSIFY...AND A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR THIS AREA. BE CERTAIN TO MONITOR LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE. THE HEAVY RAIN MAY FLOOD LOW LYING AREAS SUCH AS DITCHES...LOW WATER CROSSINGS AND UNDERPASSES. DO NOT DRIVE YOUR VEHICLE ACROSS FLOODED ROADWAYS.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 445 PM CDT FRI AUG 10 2012 TXZ186-189-102215- KENDALL-KERR- 445 PM CDT FRI AUG 10 2012 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN KERR AND NORTHWESTERN KENDALL COUNTIES UNTIL 515 PM CDT... AT 443 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM 6 MILES NORTH OF CYPRESS CREEK...OR 8 MILES NORTHEAST OF KERRVILLE...MOVING SOUTH AT 15 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... KERRVILLE... COMFORT... CYPRESS CREEK... KERRVILLE STATE PARK... CENTER POINT... THIS STORM MAY INTENSIFY. BE CERTAIN TO MONITOR LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE. THE HEAVY RAIN MAY FLOOD LOW LYING AREAS SUCH AS DITCHES...LOW WATER CROSSINGS AND UNDERPASSES. DO NOT DRIVE YOUR VEHICLE ACROSS FLOODED ROADWAYS.
The Austin/San Antonio radar (KEWX), 36 km away, was scanning. The volume nearest the first event began at 21:47 UTC.
7 thunderstorm wind. Local standard time, as filed.
A thunderstorm produced wind gusts estimated at 58 mph that blew over several large Oak trees.
A thunderstorm produced wind gusts estimated at 60 mph.
A thunderstorm produced wind gusts estimated at 75 mph near the Medical Center in San Antonio. The wind blew down large tree limbs and power lines.
A thunderstorm produced wind gusts estimated at 60 mph near the Medical Center and I-10 in San Antonio. The wind blew roofing material off an office building that broke some windows.
A thunderstorm produced wind gusts estimated at 58 mph that blew a three foot diameter tree onto a house in New Braunfels.
A thunderstorm produced wind gusts estimated at 58 mph three miles south of the San Antonio International Airport.
A thunderstorm produced wind gusts estimated at 58 mph that damaged or destroyed several outbuildings.
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: 397822, 397824, 397826, 397830, 397831, 397833, 397835.