An outflow boundary from convection across North Texas produced heavy rain as it moved south across the Big Country during the night time. During the morning hours on August 13, the outflow boundary went stationary around San Angelo.
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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 SJT wrote it up.
An outflow boundary from convection across North Texas produced heavy rain as it moved south across the Big Country during the night time. During the morning hours on August 13, the outflow boundary went stationary around San Angelo. As a weaker boundary from the south collided with the aforementioned boundary in a very moist atmosphere, extremely heavy rainfall of 3 to 8 inches fell across the City of San Angelo and resulted in flash flooding. On the morning of the 14th, more heavy rain formed and caused some flash flooding just north of San Angelo.
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 San Angelo, TX wrote its last area forecast discussion before the first event at Aug 13, 6:20 AM CST, 2 hours 32 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN ANGELO TX 720 AM CDT SAT AUG 13 2011 .DISCUSSION... SEE 12Z AVIATION DISCUSSION BELOW. && .AVIATION... A LARGE AREA OF SHOWERS AND THUNDERSTORMS WILL AFFECT MAINLY THE KABI AND KSJT TERMINAL THROUGH 15Z...WITH MVFR/OCCASIONAL IFR CONDITIONS POSSIBLE. VFR CONDITIONS EXPECTED ACROSS REMAINING TERMINALS TODAY BUT SCATTERED CONVECTION MAY DEVELOP OVER THE AREA THIS AFTERNOON. CB GROUPS SEEM REASONABLE FOR NOW DUE TO LOW CONFIDENCE. COULD SEE SOME STRATUS DEVELOP OVER SOUTHERN TERMINALS EARLY SUNDAY BUT CONFIDENCE TOO LOW TO MENTION AT THIS TIME. && .PREV DISCUSSION... /ISSUED 444 AM CDT SAT AUG 13 2011/ SHORT TERM... AN OUTFLOW BOUNDARY FROM PREVIOUS CONVECTION ALONG THE RED RIVER CONTINUES TO MOVE SLOWLY SOUTH ACROSS THE BIG COUNTRY EARLY THIS MORNING. SHOWERS AND THUNDERSTORMS HAVE BEEN INCREASING IN AREAL COVERAGE IN ASSOCIATION WITH THIS FEATURE OVER THE NORTHERN BIG COUNTRY...WITH ADDITIONAL DEVELOPMENT OCCURRING OVER FAR WESTERN PORTIONS OF THE CONCHO VALLEY. LATEST NAM MODEL GUIDANCE EXPANDS CONVECTION FARTHER SOUTH INTO THE CONCHO VALLEY AND HEARTLAND THIS MORNING...WHILE THE RUC KEEPS THE BULK OF PRECIPITATION OVER THE BIG COUNTRY. LATEST RADAR TRENDS SHOW VERY LITTLE SOUTHWARD PROGRESSION AT THIS TIME...HOWEVER ADDITIONAL OUTFLOW BOUNDARIES AHEAD OF THE CURRENT CONVECTION MAY RESULT IN A SOUTHWARD EXPANSION INTO THE CONCHO VALLEY AND HEARTLAND THROUGH THE MORNING HOURS. FOLLOWED CLOSER TO THE RUC WITH HIGHEST POPS ALIGNED NORTH OF A SAN ANGELO TO BROWNWOOD LINE THIS MORNING. WILL CONTINUE TO MONITOR AND MAKE NECESSARY REFINEMENTS IF NEEDED THROUGH THE MORNING HOURS. ABUNDANT CLOUD COVER THIS MORNING SHOULD GIVE WAY TO PARTLY CLOUDY SKIES BY AFTERNOON WITH HIGHS MAINLY IN THE MID AND UPPER 90S. ADDITIONAL SHOWERS AND STORMS MAY DEVELOP THIS AFTERNOON DURING PEAK HEATING SO KEPT SLIGHT POPS GOING INTO THE EARLY EVENING HOURS. LOWS TONIGHT WILL BE MAINLY IN THE MID AND UPPER 70S. LONG TERM... A RETURN TO HOT AND DRY CONDITIONS CONTINUES TO BE INDICATED FOR NEXT WEEK. THE UPPER HIGH WILL START BUILDING INTO TEXAS FROM NEW MEXICO ON SUNDAY. DEPENDING ON HOW MUCH RAINFALL OCCURS TODAY AND HOW EXTENSIVE IS THE COVERAGE...MAX TEMPERATURES ON SUNDAY MAY BE HELD DOWN BY A FEW DEGREES...DUE TO EVAPOTRANSPIRATIVE EFFECTS. THIS CAN BE EXAMINED LATER TODAY. THE UPPER LEVEL HIGH WILL EXPAND EARLY NEXT WEEK AND BE POSITIONED DIRECTLY OVER TEXAS. FOR THE MIDDLE TO LATE PART OF TEH WEEK...UPPER HIGH WILL BECOME CENTERED OVER WESTERN NEW MEXICO...BUT WILL STILL REMAIN IN CLOSE ENOUGH PROXIMITY TO BE OUR DOMINANT WEATHER INFLUENCE. SOME STRENGTHENING OF THE 850 MB THERMAL RIDGE IS INDICATED FOR OUR AREA WEDNESDAY-FRIDAY. THIS SHOULD RESULT IN TEMPERATURES A COUPLE OF DEGREES HOTTER THAN IN THE FIRST PART OF THE WEEK. OVERALL...EXPECT HIGHS TO BE MOSTLY IN THE RANGE OF 100-105 DEGREES...WITH OVERNIGHT LOWS 75-80. && .PRELIMINARY POINT TEMPS/POPS... ABILENE 95 75 101 77 101 / 50 20 10 10 0 SAN ANGELO 95 74 101 76 102 / 30 20 0 0 0 JUNCTION 96 74 100 75 100 / 20 20 0 10 0 && .SJT WATCHES/WARNINGS/ADVISORIES... NONE. && 99/99/24
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN ANGELO TX 622 AM CDT SAT AUG 13 2011 TXZ049-054-064>066-071>073-076>078-098-099-113-114-127-128-139- 140-154-155-168>170-141130- FISHER-NOLAN-STERLING-COKE-RUNNELS-IRION-TOM GREEN-CONCHO- CROCKETT-SCHLEICHER-SUTTON-HASKELL-THROCKMORTON-JONES-SHACKELFORD- TAYLOR-CALLAHAN-COLEMAN-BROWN-MCCULLOCH-SAN SABA-MENARD-KIMBLE- MASON- 622 AM CDT SAT AUG 13 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WEST CENTRAL TEXAS. .DAY ONE...TODAY AND TONIGHT SCATTERED TO NUMEROUS THUNDERSTORMS WILL OCCUR THIS MORNING... POSSIBLY LINGERING INTO THIS AFTERNOON. THE STORMS WILL CONTAIN FREQUENT LIGHTNING...VERY HEAVY RAIN...AND WIND GUSTS OF 35 TO 40 MPH. LOCALLY HEAVY RAINFALL COULD CAUSE PONDING OF WATER ON ROADS AND MAY RESULT IN MINOR FLOODING. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY THE PROBABILITY OF WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
The San Angelo radar (KSJT), 5 km away, was scanning. The volume nearest the first event began at 14:53 UTC.
5 flash flood. Local standard time, as filed.
Flooding was reported at Pierce and Colorado Streets in San Angelo. The water had risen above the tires of the vehicles.
Two cars were stranded in water on Foster road which is located on the east side of San Angelo near the Department of Public Safety Office.
More cars were reportedly stranded in deep water at College Hills and Sunset Avenue.
The flooded roads across the City of San Angelo resulted in several water rescues.
Flooded roads were reported in Quail Valley with two streets barricaded.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2011Every state in 2011This day in weather historyWarnings in Texas, August 2011
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: 342234, 342236, 342238, 342239, 342240.