A weak cold frontal boundary over the area WA with slow moving convection that was training and merging SE of San Antonio resulted in locallized heavy rains mainly over northern Wilson County where radar estimates were highest.
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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 frontal boundary over the area WA with slow moving convection that was training and merging SE of San Antonio resulted in locallized heavy rains mainly over northern Wilson County where radar estimates were highest.
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 May 27, 7:52 AM CST, 38 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 852 AM CDT WED MAY 27 2009 .UPDATE... HAVE DONE ANOTHER UPDATE TO ADD SEVERE TO THE FCST...PER LATEST SWOMCD FROM SPC. && .PREV DISCUSSION... /ISSUED 826 AM CDT WED MAY 27 2009/ UPDATE... SHOWERS AND THUNDERSTORMS CONTINUE TO ERUPT ON THE SLOW MOVING FRONTAL BOUNDARY. THESE STORMS ARE SLOW MOVERS AND ARE PRODUCING VERY HEAVY RAINFALL. HAVE UPDATED THE FIRST PERIOD GRIDS TO INCREASE POPS AND ADD LOCALLY HEAVY RAINFALL. PREV DISCUSSION... /ISSUED 645 AM CDT WED MAY 27 2009/ AVIATION... A WEAK SURFACE BOUNDARY AND AN UPPER LEVEL SHORTWAVE WILL INTERACT WITH A MOIST AIRMASS TO GENERATE ISOLATED TO SCATTERED SHRA/TSRA ACROSS SOUTH CENTRAL TEXAS TODAY AND TONIGHT. HAVE MENTIONED CB, VCTS, OR VCSH AT THE TAF SITES DUE UNCERTAINTY ON TIMING. VFR CIGS WILL PREVAIL WITH SCT-BKN STRATOCUMULUS/CUMULUS WITH LAYERS ABOVE TO CIRRUS, EXCEPT MVFR CIGS CAN BE EXPECTED ALONG AND SE OF A KCOT TO KUVA TO KSAT TO K3T5 LINE THROUGH 15Z. NELY WINDS 5 TO 10 KTS WILL PREVAIL, ALTHOUGH WIND DIRECTION MAY BE ERRATIC AT TIMES DUE TO A WEAK PRESSURE GRADIENT. WIND GUSTS TO 40 KTS IN AND NEAR SHRA/TSRA ARE POSSIBLE. PREV DISCUSSION... /ISSUED 359 AM CDT WED MAY 27 2009/ DISCUSSION... A WEAK FRONTAL BOUNDARY DRAPED ACROSS THE STATE HAS ENABLED SHOWERS AND THUNDERSTORMS TO PERSIST OVERNIGHT. THE MAJORITY OF THE ACTIVITY HAS REMAINED TO OUR NORTH SO FAR...WITH ONLY ISOLATED CONVECTION DEVELOPING ACROSS THE HILL COUNTRY. HOWEVER...THERE IS AN EXPECTATION THAT THE WEAK ENERGY FROM THIS SYSTEM WILL COMBINE WITH DIURNAL HEATING AND JUICY DEWPOINTS TO GENERATE MORE WIDESPREAD ACTIVITY THROUGHOUT THE DAY. RAIN CHANCES WILL END FROM NORTHWEST TO SOUTHEAST THIS AFTERNOON WITH WEAK CAA FILTERING IN AFTERWARDS. GFS CONTINUES TO DEPICT ACTIVITY DEVELOPING ACROSS NERN MEXICO THIS EVENING WITH AN MCS PUSHING EASTWARD INTO THE RIO GRANDE PLAINS OVERNIGHT. AGREE WITH THIS SOLUTION AND THUS HAVE POPS INCREASING ACROSS THE SOUTHWEST COUNTIES TONIGHT AND EXITING BY SUNRISE AS THE SYSTEM DISSIPATES. LINGERING MOISTURE AND INSTABILITIES JUSTIFY KEEPING IN A SLIGHT CHANCE MENTION FOR RAIN ACROSS SOUTH CENTRAL TEXAS THURSDAY AFTERNOON. UPPER LEVEL RIDGING THEN BEGINS TO BUILD ACROSS THE REGION SHUNTING ANY CHANCES FOR RAIN OVER THE WEEKEND. TEMPERATURES THIS AFTERNOON WILL BE HIGHLY DEPENDENT UPON THE TIMING AND LOCATION OF THE CONVECTION...BUT GENERALLY ANTICIPATE NEAR NORMAL HIGHS ACROSS THE SOUTHERN HALF OF THE CWA AND SLIGHTLY COOLER THAN NORMAL TEMPS ACROSS THE HILL COUNTRY AND ADJACENT AREAS. A GRADUAL WARMING TREND WILL ENSUE FOR THE REST OF THE WORK WEEK WITH AFTERNOON TEMPERATURES REACHING INTO THE 90S. SEASONABLE TEMPERATURES FOR LATE MAY/EARLY JUNE ARE EXPECTED FOR THE REST OF THE FORECAST PERIOD. && .PRELIMINARY POINT TEMPS/POPS... AUSTIN CAMP MABRY 85 67 90 64 91 / 40 20 20 10 10 AUSTIN BERGSTROM INTL AIRPORT 84 65 89 62 91 / 70 20 20 10 10 NEW BRAUNFELS MUNI AIRPORT 86 66 89 61 91 / 70 20 20 10 10 BURNET MUNI AIRPORT 83 65 88 62 89 / 10 10 20 10 10 DEL RIO INTL AIRPORT 90 71 91 69 89 / 30 30 20 20 10 GEORGETOWN MUNI AIRPORT 84 66 88 64 90 / 40 10 20 10 10 HONDO MUNI AIRPORT 89 66 90 64 88 / 30 30 20 20 10 SAN MARCOS MUNI AIRPORT 85 66 89 62 90 / 70 20 20 10 10 LA GRANGE - FAYETTE REGIONAL 87 69 87 65 89 / 70 20 20 10 - SAN ANTONIO INTL AIRPORT 88 68 89 64 89 / 40 20 20 10 10 STINSON MUNI AIRPORT 89 69 90 65 92 / 70 30 20 20 10 && .EWX WATCHES/WARNINGS/ADVISORIES... NONE. && 13/01
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 916 AM CDT WED MAY 27 2009 TXZ171>173-183>194-202>209-217>225-228-281115- 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- 916 AM CDT WED MAY 27 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL TEXAS. .DAY ONE...TODAY AND TONIGHT... SLOW MOVING SHOWERS AND THUNDERSTORMS WITH HEAVY RAIN WILL CAUSE FLASH FLOODING OVER THE COASTAL PLAINS GENERALLY SOUTH OF I10 AND EAST OF I35 THIS MORNING AND INTO THE EARLY AFTERNOON. A FEW OF THE THUNDERSTORMS MAY CONTAIN SMALL HAIL AND WIND GUSTS TO 40 MPH. HAZARDOUS WEATHER IS NOT EXPECTED TONIGHT. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY... 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 617 AM CDT WED MAY 27 2009 TXZ193-271215- BASTROP- 617 AM CDT WED MAY 27 2009 ...A STRONG THUNDERSTORM WAS AFFECTING BASTROP COUNTY... AT 617 AM CDT...NWS METEOROLOGISTS ARE TRACKING A STRONG THUNDERSTORM NEAR ROSANKY...OR 12 MILES SOUTHWEST OF SMITHVILLE...MOVING EAST AT 10 MPH. PEOPLE IN SOUTHERN BASTROP COUNTY...INCLUDING THE FOLLOWING LOCATIONS...ROSANKY AND SMITHVILLE...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 30 TO 40 MPH ARE EXPECTED WITH THIS STORM.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 711 AM CDT WED MAY 27 2009 TXZ205-207-221-271315- BEXAR-GUADALUPE-WILSON- 711 AM CDT WED MAY 27 2009 ...STRONG THUNDERSTORMS WERE AFFECTING BEXAR...GUADALUPE AND WILSON COUNTIES... AT 711 AM CDT...NWS METEOROLOGISTS ARE TRACKING STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM LA VERNIA TO CALAVERAS LAKE...OR ALONG A LINE EXTENDING FROM 14 MILES SOUTHWEST OF SEGUIN TO 13 MILES SOUTHEAST OF SAN ANTONIO...MOVING EAST AT 5 MPH. PEOPLE IN NORTHERN WILSON...SOUTHEASTERN BEXAR AND SOUTHERN GUADALUPE COUNTIES...INCLUDING THE FOLLOWING LOCATIONS...ST. HEDWIG... ELMENDORF...CHINA GROVE...NEW BERLIN...CALAVERAS LAKE AND LA VERNIA...SHOULD MONITOR THE WEATHER SITUATION CLOSELY. LISTEN FOR POSSIBLE WARNINGS AND BE PREPARED TO TAKE APPROPRIATE ACTION SHOULD SEVERE WEATHER THREATEN. DIME SIZE HAIL...AND WINDS 30 TO 40 MPH ARE EXPECTED WITH THESE STORMS.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 754 AM CDT WED MAY 27 2009 TXZ205-207-221-271400- BEXAR-GUADALUPE-WILSON- 754 AM CDT WED MAY 27 2009 ...STRONG THUNDERSTORMS WERE AFFECTING BEXAR...GUADALUPE AND WILSON COUNTIES... AT 752 AM CDT...NWS METEOROLOGISTS ARE TRACKING STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM LA VERNIA TO ELMENDORF...OR ALONG A LINE EXTENDING FROM 11 MILES NORTHWEST OF STOCKDALE TO 15 MILES SOUTHEAST OF SAN ANTONIO...MOVING EAST AT 5 MPH. PEOPLE IN NORTHERN WILSON...SOUTHEASTERN BEXAR AND SOUTHERN GUADALUPE COUNTIES...INCLUDING THE FOLLOWING LOCATIONS...LA VERNIA...CALAVERAS LAKE...ELMENDORF AND SUTHERLAND SPRINGS...SHOULD MONITOR THE WEATHER SITUATION CLOSELY. LISTEN FOR POSSIBLE WARNINGS AND BE PREPARED TO TAKE APPROPRIATE ACTION SHOULD SEVERE WEATHER THREATEN. DIME SIZE HAIL...AND WINDS 30 TO 40 MPH ARE EXPECTED WITH THESE STORMS.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 833 AM CDT WED MAY 27 2009 TXZ221-271430- WILSON- 833 AM CDT WED MAY 27 2009 ...A STRONG THUNDERSTORM WAS AFFECTING WILSON COUNTY... AT 831 AM CDT...NWS METEOROLOGISTS ARE TRACKING A STRONG THUNDERSTORM NEAR SUTHERLAND SPRINGS...OR 6 MILES WEST OF STOCKDALE...MOVING SLOWLY EAST AND SOUTHEAST AT 10 MPH. PEOPLE IN EASTERN WILSON COUNTY...INCLUDING THE FOLLOWING LOCATIONS...SUTHERLAND SPRINGS AND STOCKDALE...SHOULD MONITOR THE WEATHER SITUATION CLOSELY. LISTEN FOR POSSIBLE WARNINGS AND BE PREPARED TO TAKE APPROPRIATE ACTION SHOULD SEVERE WEATHER THREATEN. DIME SIZE HAIL...AND WINDS 30 TO 40 MPH ARE EXPECTED WITH THIS STORM.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
912 AM CDT WED MAY 27 2009
..TIME.. ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE.. ....MAG.... ..COUNTY LOCATION.. ST.. ...SOURCE....
..REMARKS..
0911 AM HEAVY RAIN 5 S ST. HEDWIG 29.35N 98.21W
05/27/2009 M4.10 INCH WILSON TX COCORAHS
SINCE 7 AM
&&
EVENT NUMBER 00608
JPBSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 923 AM CDT WED MAY 27 2009 TXZ221-222-271530- KARNES-WILSON- 923 AM CDT WED MAY 27 2009 ...A STRONG THUNDERSTORM WAS AFFECTING KARNES AND WILSON COUNTIES... AT 922 AM CDT...NWS METEOROLOGISTS ARE TRACKING A STRONG THUNDERSTORM NEAR GILLETT...OR 6 MILES NORTHEAST OF KOSCIUSKO...MOVING SOUTHEAST AT 5 MPH. PEOPLE IN EASTERN WILSON AND NORTHEASTERN KARNES COUNTIES...INCLUDING THE FOLLOWING LOCATIONS...GILLETT...SHOULD MONITOR THE WEATHER SITUATION CLOSELY. LISTEN FOR POSSIBLE WARNINGS AND BE PREPARED TO TAKE APPROPRIATE ACTION SHOULD SEVERE WEATHER THREATEN. DIME SIZE HAIL...AND WINDS AROUND 40 MPH ARE EXPECTED WITH THIS STORM.
The Austin/San Antonio radar (KEWX), 46 km away, was scanning. The volume nearest the first event began at 14:29 UTC.
2 flash flood. Local standard time, as filed.
FM 3432 was reported closed due to high water in western Wilson County.
Portion of FM 539 was closed due to high water.
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, May 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: 163696, 163697.