A weak cold front interacted with deep boundary layer moisture to cause isolated thunderstorms which produced heavy rainfall and flash flooding in Bexar and Travis counties. 15 inches in Sunset Valley in the southwest Austin area.
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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 weak cold front interacted with deep boundary layer moisture to cause isolated thunderstorms which produced heavy rainfall and flash flooding in Bexar and Travis counties. CoCoRAHs observers reported 24 hour rainfall totals of 4.30 inches in Tanglewood Forest and 4.15 inches in Sunset Valley in the southwest Austin area.
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 Jun 28, 6:05 PM CST, 1 hour 33 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 705 PM CDT MON JUN 28 2010 .AVIATION... A COUPLE OF OUTFLOW BOUNDARIES MAINLY WEST OF I 35 WILL CONTINUE TO PRODUCE SHOWERS AND ISOLATED THUNDERSTORMS FOR THE NEXT SEVERAL HOURS NEAR SAT...SSF AND AUS AIRPORTS. MOST OF THIS ACTIVITY SHOULD BE DIMINISHING WITHIN THE NEXT HOUR OR TWO AS THE EVENING PROGRESSES. ACROSS DRT...A SHOWER OR AN ISOLATED THUNDERSTORM COULD BE ON THE VICINITY WITHIN THE NEXT FEW HOURS. AFTERWARD...SHOWERS SHOULD REMAIN AWAY FROM THE STATION. FOR THE REST OF THIS EVENING INTO TUESDAY CONTINUING THROUGH LATE TUESDAY...VFR/MVFR CONDITIONS ARE EXPECTED TO PREVAIL ACROSS THE I 35 CORRIDOR SITES WITH MVFR CIGS DURING THE MORNING HOURS AND ONCE AGAIN DURING THE LATE AFTERNOON MAINLY WEST OF I 35 AS CONVECTIVE ACTIVITY IS EXPECTED. .PREV DISCUSSION... /ISSUED 325 PM CDT MON JUN 28 2010/ ..AREAS OF HEAVY RAIN POSSIBLE TONIGHT...THEN A CONTINUING WET PATTERN IS EXPECTED THROUGH THE REST OF THE WEEK... DISCUSSION... A LOT TO DISCUSS WITH THIS FORECAST PACKAGE. SHOWERS AND THUNDERSTORMS WILL CONTINUE THROUGH THIS EVENING ACROSS THE COASTAL PLAINS WITH ACTIVITY GRADUALLY DIMINISHING AFTER SUNSET. MEANWHILE...CONVECTIVE ACTIVITY WILL INCREASE ACROSS THE EDWARDS PLATEAU/WESTERN HILL COUNTRY/RIO GRANDE PLAINS THIS EVENING AND OVERNIGHT WITH THE PASSAGE OF THE POORLY DEFINED FRONT. EXPECTING THE BULK OF STORMS TO SHIFT TO THE NORTHEASTERN PORTION OF THE CWA BY TUESDAY MORNING. MODELS ARE IN DECENT AGREEMENT THAT THE HEAVIEST RAINS WILL BE ALONG AND NORTH OF THE HILL COUNTRY...BUT HAVE EXPANDED THE PREVIOUS FLASH FLOOD WATCH TO INCLUDE THE I-35 CORRIDOR COUNTIES AS THIS AREA IS HIGHLY URBANIZED AND THUS REQUIRES MUCH LESS RAINFALL FOR RUN-OFF FLASH FLOODING. A BRIEF PERIOD OF (RELATIVE) DRYNESS IS EXPECTED LATE TUESDAY/EARLY WEDNESDAY. THE FORECAST FOR THE MIDDLE OF THE WEEK IS HIGHLY DEPENDENT UPON TROPICAL CYCLONE ALEX AND IS A BLEND OF GFS/GUIDANCE FROM NHC. THE CURRENT TRACK KEEPS ALEX'S LANDFALL WELL TO OUR SOUTH WHICH MEANS SOUTH CENTRAL TEXAS WILL BE ON THE WETTER SIDE OF THE SYSTEM AS IT MAKES LANDFALL. THE OUTER FRINGES OF ALEX WILL CAUSE RAIN CHANCES TO INCREASE ACROSS OUR AREA ON WEDNESDAY AND STAY IN THE FORECAST THROUGH THE REST OF THE WORKWEEK. REGARDLESS OF THE EVENTUAL TRACK OF ALEX...GIVEN THE ANTECEDENT RAIN EVENT THROUGH THE NEXT 24 HOURS...SATURATED OR NEAR SATURATED SOILS ARE EXPECTED IN ADVANCE OF THE RAINFALL FROM TROUBLESOME ALEX. THEREFORE...A RENEWED CHANCE FOR FLASH FLOODING AND RIVER FLOODING IS EXPECTED THROUGH THE END OF THE WORKWEEK AND POSSIBLY INTO THE WEEKEND AS ALEX SLOWS DOWN AND SHEARS APART. GIVEN THE WET AND CLOUDY PATTERN THROUGH THE WEEK...AFTERNOON TEMPERATURES WILL BE SUBDUED AND OVERNIGHT CONDITIONS WILL BE MUGGY AND MILD. HAVE GONE WITH A BLEND OF MET AND MEX TEMPERATURES FOR THE NEAR TERM. STAYED CLOSE TO GFS ENSEMBLE TEMPERATURES THROUGH THE MIDDLE OF THE WEEK AS NUMBERS SEEM REASONABLE GIVEN THE ANTICIPATED ARRIVAL OF ALEX. && .PRELIMINARY POINT TEMPS/POPS... AUSTIN CAMP MABRY 75 93 75 90 75 / 50 50 20 50 30 AUSTIN BERGSTROM INTL AIRPORT 75 92 74 89 74 / 50 50 20 50 30 NEW BRAUNFELS MUNI AIRPORT 74 93 75 90 76 / 50 50 20 50 40 BURNET MUNI AIRPORT 73 87 72 87 73 / 60 50 20 30 20 DEL RIO INTL AIRPORT 74 91 74 92 74 / 60 40 30 20 20 GEORGETOWN MUNI AIRPORT 74 89 73 90 73 / 50 50 20 40 20 HONDO MUNI AIRPORT 73 93 74 91 75 / 50 40 20 30 30 SAN MARCOS MUNI AIRPORT 74 94 75 90 75 / 50 50 20 50 40 LA GRANGE - FAYETTE REGIONAL 76 94 74 89 76 / 30 50 30 50 50 SAN ANTONIO INTL AIRPORT 75 94 77 89 76 / 50 40 20 40 40 STINSON MUNI AIRPORT 76 94 76 90 75 / 40 40 20 40 40 && .EWX WATCHES/WARNINGS/ADVISORIES... FLASH FLOOD WATCH THROUGH TUESDAY MORNING FOR THE FOLLOWING COUNTIES: BANDERA...BEXAR...BLANCO...BURNET...COMAL...EDWARDS... GILLESPIE...HAYS...KENDALL...KERR...KINNEY...LLANO...MAVERICK... MEDINA...REAL...TRAVIS...UVALDE...VAL VERDE...WILLIAMSON. && 11/17
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 333 PM CDT MON JUN 28 2010 TXZ171>173-183>194-202>209-217>225-228-291100- 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- 333 PM CDT MON JUN 28 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL TEXAS. .DAY ONE...THIS AFTERNOON AND TONIGHT... A FLASH FLOOD WATCH IS IN EFFECT FOR THE HILL COUNTRY...EDWARDS PLATEAU AND ADJACENT AREAS ACROSS THE ESCARPMENT THROUGH NOON ON TUESDAY. A WEAK UPPER LEVEL DISTURBANCE OVER WESTERN TEXAS AND A WEAK COLD FRONT DRIFTING SOUTH ACROSS THE ESCARPMENT WILL INTERACT WITH A VERY MOIST AIRMASS TO GENERATE SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS THIS AFTERNOON AND TONIGHT. LOCALLY HEAVY RAINFALL AMOUNTS OF 2 TO 4 INCHES ARE POSSIBLE...ESPECIALLY ACROSS THE WATCH AREA. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY... A FLASH FLOOD WATCH IS IN EFFECT FOR THE HILL COUNTRY...EDWARDS PLATEAU AND ADJACENT AREAS ACROSS THE ESCARPMENT THROUGH NOON ON TUESDAY. A WEAK UPPER LEVEL DISTURBANCE OVER WESTERN TEXAS AND A WEAK COLD FRONT DRIFTING SOUTH ACROSS SOUTH CENTRAL TEXAS WILL INTERACT WITH A VERY MOIST AIRMASS TO GENERATE SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS TUESDAY. LOCALLY HEAVY RAINFALL AMOUNTS OF 2 TO 4 INCHES ARE POSSIBLE...ESPECIALLY ACROSS THE WATCH AREA. TROPICAL STORM ALEX IS FORECAST TO BECOME A HURRICANE IN THE WESTERN GULF OF MEXICO ON TUESDAY...MOVE INLAND NEAR BROWNSVILLE EARLY THURSDAY AND CONTINUE UP THE RIO GRANDE REGION FRIDAY INTO SATURDAY. RAINFALL ASSOCIATED WITH ALEX WILL BEGIN TO IMPACT SOUTH CENTRAL TEXAS WEDNESDAY AND PERSIST THROUGH FRIDAY INTO SATURDAY. THE MAIN THREAT WILL BE LOCALLY HEAVY RAINS AND ISOLATED FLOODING. HOWEVER...IF ALEX MOVES INLAND FURTHER NORTH ALONG THE TEXAS COAST AND TAKES A TRACK FURTHER NORTH...HEAVY RAINFALL AND FLOODING WOULD BECOME MORE WIDESPREAD. THERE WOULD ALSO BE A THREAT FOR STRONGER AND GUSTY WINDS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEED OVER THE NEXT FEW DAYS.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 743 PM CDT MON JUN 28 2010 TXZ205-290130- BEXAR- 743 PM CDT MON JUN 28 2010 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL BEXAR COUNTY UNTIL 830 PM CDT... AT 736 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM NEAR ALAMO HEIGHTS...OR NEAR SAN ANTONIO...MOVING SOUTH AT 5 MPH. 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... SHAVANO PARK... HILL COUNTRY VILLA... HOLLYWOOD PARK... WINDCREST... LIVE OAK... FIESTA TEXAS... SAN ANTONIO INT AP... CONVERSE... IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. 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), 45 km away, was scanning. The volume nearest the first event began at 01:38 UTC.
2 flash flood. Local standard time, as filed.
Thunderstorms produced heavy rain which caused flooding in the San Antonio area. Parts of Bitters Road, Starcrest Drive, North Park Drive, West Avenue, and George Road were closed due to flooding.
Thunderstorms produced heavy rain which caused flooding in the Austin area. A number of vehicles were stranded in flood waters and their occupants needed help escaping. Numerous roads were closed around the city.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2010Every state in 2010This day in weather historyWarnings in Texas, June 2010
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: 240879, 240884.