A stagnant upper air pattern of a weak trough combined with deep subtropical moisture and a weak frontal boundary to cause thunderstorms for several days. These storms produced isolated areas of heavy rain leading to flash flooding along with some strong winds and large hail.
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 stagnant upper air pattern of a weak trough combined with deep subtropical moisture and a weak frontal boundary to cause thunderstorms for several days. These storms produced isolated areas of heavy rain leading to flash flooding along with some strong winds and large hail.
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 Jul 9, 4:41 PM CST, 24 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 541 PM CDT MON JUL 9 2012 .UPDATE... ONGOING CONVECTION. && .DISCUSSION... UPDATED SHORT TERM POPS AND WEATHER TO ACCOUNT FOR ONGOING CONVECTION. BETTER CHANCE FOR SHOWERS AND THUNDERSTORMS IN THE SOUTHWESTERN COUNTIES. LESS CHANCE IN THE SOUTHEASTERN COUNTIES IN THE NEXT COUPLE OF HOURS. && .PREV DISCUSSION... /ISSUED 300 PM CDT MON JUL 9 2012/ DISCUSSION... THIS AFTERNOON SCATTERED SHOWERS AND THUNDERSTORMS HAVE DEVELOPED ACROSS THE HILL COUNTRY AND EDWARDS PLATEAU. ISOLATED SHOWERS AND THUNDERSTORMS WERE ALSO DEVELOPING ACROSS THE REMAINDER OF SOUTH CENTRAL TEXAS. ONCE AGAIN THE HI-RES ARW WAS THE BEST AT FCSTING WHERE CONVECTION WOULD INITIATE. THUNDERSTORMS LATE THIS AFTERNOON THROUGH THIS EVENING WILL BE SLOW MOVING PRODUCING LOCALLY HEAVY RAINFALL AND WIND GUSTS OF 30 TO 40 MPH. HI-RES SOLUTIONS INDICATE THAT THE CONVECTION WILL DRIFT TO THE SSW AND DIMINISH IN INTENSITY AND AREAL COVERAGE AFTER MIDNIGHT. THIS AFTERNOON THE IR/WV SATELLITE LOOP DEPICTED A BROAD CYCLONIC CIRCULATION OVER ARKANSAS AND LOUISIANA WITH A SW TO NE SHEAR AXIS BISECTING SOUTH CENTRAL TEXAS. THIS UPPER LEVEL PATTERN WILL PERSIST ACROSS OUR CWFA TONIGHT THROUGH WEDNESDAY AND WILL BE THE TIME FRAME WHEN OUR CHANCES FOR SHOWERS AND THUNDERSTORMS PEAK. A WEAK SFC BOUNDARY WILL ALSO SINK SOUTHWARD INTO SOUTH CENTRAL TEXAS AND THIS BOUNDARY WILL PROVIDE A FOCUS FOR LOW LEVEL CONVERGENCE...HENCE THE HIGHER POPS FOR TUESDAY AND WEDNESDAY. PWS AROUND 2 INCHES WILL BE IN PLACE SO LOCALLY HEAVY RAINFALL WILL OCCUR. SOME LOCATIONS MAY RECEIVE 2 TO 3 INCHES OF RAINFALL OVER THE NEXT 36 TO 48 HOURS. RAIN CHANCES WILL BEGIN TO DIMINISH THURSDAY AND WILL BE CONFINED TO THE SOUTHEAST COUNTIES BY THE UPCOMING WEEKEND. THE UPPER LEVEL TROF AXIS OVER SOUTH CENTRAL TEXAS IS EXPECTED TO WEAKEN AND SHIFT EASTWARD AS THE UPPER LEVEL HIGH CENTERED OVER THE 4 CORNERS REGION EXPANDS EASTWARD. COOLER AFTERNOON TEMPERATURES ARE EXPECTED FOR MUCH OF THE REGION TUESDAY AND WEDNESDAY DUE TO CLOUD COVER AND PCPN. HIGHS WILL RANGE FROM THE MID TO UPPER 80S ACROSS THE HILL COUNTRY TO MID 90S EXTREME SOUTHWEST. && .PRELIMINARY POINT TEMPS/POPS... AUSTIN CAMP MABRY 75 90 75 90 74 / 40 70 60 50 30 AUSTIN BERGSTROM INTL AIRPORT 73 90 73 89 73 / 40 70 60 50 30 NEW BRAUNFELS MUNI AIRPORT 73 88 72 88 73 / 40 70 60 50 30 BURNET MUNI AIRPORT 74 89 74 87 73 / 50 70 60 50 30 DEL RIO INTL AIRPORT 76 94 76 90 76 / 40 50 50 50 30 GEORGETOWN MUNI AIRPORT 74 90 74 88 73 / 50 70 60 50 30 HONDO MUNI AIRPORT 73 91 74 90 74 / 40 70 60 50 30 SAN MARCOS MUNI AIRPORT 74 88 73 87 73 / 40 70 60 50 30 LA GRANGE - FAYETTE REGIONAL 75 88 74 89 74 / 40 70 50 50 30 SAN ANTONIO INTL AIRPORT 76 90 76 89 76 / 40 70 60 50 30 STINSON MUNI AIRPORT 75 90 76 90 75 / 40 70 60 50 30 && .EWX WATCHES/WARNINGS/ADVISORIES... NONE. && MESOSCALE/AVIATION...18 SYNOPTIC/GRIDS...05 PUBLIC SERVICE/DATA COLLECTION...30
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 450 AM CDT MON JUL 9 2012 TXZ171>173-183>194-202>209-217>225-228-101000- 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- 450 AM CDT MON JUL 9 2012 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...TUESDAY THROUGH SUNDAY... SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS TUESDAY COULD PRODUCE LOCALLY HEAVY RAINFALL. LOCALLY HEAVY RAINFALL AMOUNTS OF 2 TO 3 INCHES WILL PRODUCE URBAN AND SMALL STREAM FLOODING. OTHERWISE 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 552 PM CDT MON JUL 9 2012 TXZ173-192-092345- TRAVIS-WILLIAMSON- 552 PM CDT MON JUL 9 2012 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL WILLIAMSON AND NORTHEASTERN TRAVIS COUNTIES UNTIL 645 PM CDT... AT 549 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM NEAR HUTTO...OR 7 MILES NORTHEAST OF ROUND ROCK...MOVING SOUTH AT 10 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... ROUND ROCK... PFLUGERVILLE... WINDEMERE... HUTTO... RICES CROSSING... WELLS BRANCH... IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING.
The Ft Hood radar (KGRK), 38 km away, was scanning. The volume nearest the first event began at 23:07 UTC.
8 flash flood, 4 thunderstorm wind, 1 hail. Local standard time, as filed.
A thunderstorm produced wind gusts estimated at 52 kts.
A thunderstorm produced wind gusts estimated at 45 mph that broke 2-3 inch diameter branches off several trees.
A thunderstorm produced wind gusts estimated at 50 kts and pea size hail.
A thunderstorm produced one and half inch hail and wind gusts estimated between 60 and 70 mph.
A thunderstorm produced wind gusts estimated at 58 mph that downed several trees.
Thunderstorms produced heavy rain that caused flash flooding closing FM 969 from Webberville to Upper Elgin Road.
Thunderstorms produced heavy rain that caused flash flooding closing FM 969 one half mile north of Utley.
Thunderstorms produced heavy rain that caused flash flooding in Leakey where two feet of water covered the intersection of Ranch Road 337 and Hwy. 83.
Thunderstorms produced heavy rain that caused flash flooding covering Hwy. 55 with 18 inches of water.
Thunderstorms produced heavy rain that caused flash flooding and closed several roads in and around San Antonio.
Thunderstorms produced heavy rain that caused flash flooding and closed Old Bee Caves Rd at Hwy 71.
Thunderstorms produced heavy rain that caused flash flooding closing numerous secondary roads around Cuero.
Thunderstorms produced heavy rain that caused flash flooding closing FM 766 northwest of Cuero.
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, July 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: 394105, 394110, 394111, 394112, 394114, 394116, 394119, 394120, 394123, 396552, 396561, 396563, 396564.