A warm and humid atmosphere combined with a weakening upper ridge to allow scattered thunderstorms to form.
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 warm and humid atmosphere combined with a weakening upper ridge to allow scattered thunderstorms to form.
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 21, 11:30 AM CST, 1 hour 30 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 1230 PM CDT SAT JUN 21 2008 .AVIATION...VFR CONDITIONS WILL PREVAIL FOR THE NEXT 24 HOURS. SCATTERED MID AND HIGH LEVEL CLOUDS ARE ACROSS THE REGION THIS AFTERNOON. THERE IS A SLIGHT CHANCE FOR SHOWERS AND THUNDERSTORMS TO DEVELOP THIS AFTERNOON ACROSS SOUTH CENTRAL TEXAS...THUS HAVE INCLUDED VCTS/CB IN THE TAF FORECAST BEGINNING AT 20-21Z. && .PREV DISCUSSION... /ISSUED 1103 AM CDT SAT JUN 21 2008/ UPDATE... LATE MORNING TEMPERATURES RUNNING A CATEGORY WARMER THAN GRIDS SHOWED, SO HAVE RAISED AFTERNOON TEMPERATURES ACCORDINGLY. OTHERWISE, ONGOING SOUTH CENTRAL TEXAS FORECASTS ON TRACK WITH ONLY MINOR ADJUSTMENTS TO THE REMAINDER OF THE SENSIBLE WEATHER GRID TRENDS FOR THIS AFTERNOON. PREV DISCUSSION... /ISSUED 649 AM CDT SAT JUN 21 2008/ AVIATION... VFR THIS MORNING WITH SCT CLOUDS ABOVE 10 THSD FT BECOMING 5 THSD TO 10 THSD SCT WITH INCREASING CLOUDINESS ABOVE 10 THSD FT AFTER 18Z. WDLY SCT SHRA AND TSRA ARE EXPECTED TO FORM IN THE AFTERNOON THROUGH THE EVENING...WITH CIGS AROUND 3 THSD TO 5 THSD BKN TO OVC. SOME OF THE TSRA COULD POTENTIALLY BRING BRIEF WIND GUSTS OF 25 TO 35 KNOTS. AFTER 06Z TONIGHT... 8 THSD SCT WITH SCT TO BKN CLOUDS ABOVE 10 THSD FT...AND LIGHT EAST TO NORTHEAST WINDS ARE EXPECTED. PREV DISCUSSION... /ISSUED 434 AM CDT SAT JUN 21 2008/ DISCUSSION... NW FLOW PATTERN ALOFT WILL BRING ANOTHER CHANCE OF RAIN FOR MUCH OF THE AREA TODAY INTO SUNDAY MORNING AIDED BY A SURFACE RIDGE SPILLING IN FROM NORTH TX. A WEAK FRONTAL FEATURE IN THE DFW AREA IS ALREADY GENERATING A FEW THUNDERSTORMS, BUT SATELLITE WV IMAGERY AND RADAR DERIVED WINDS INDICATE A POCKET OF DRY AIR OVER CENTRAL TX SOUTH OF THIS FEATURE. MODEL TRENDS WERE SLIGHTLY MORE AGRESSIVE OVER THE PAST COUPLE RUNS INDICATING THIS DRIER AIR MAY AFFECT THE RAIN CHANCES TODAY. THUS AM EXPECTING MOST FOLKS TO SEE WIDELY SCATTERED SHOWERS AND THUNDERSTORMS LATE THIS AFTERNOON AND THIS EVENING, BUT WILL STAY CLOSE TO THE CONSERVATE POPS. THE DRIER AIR COULD ALSO SUPPORT STRONG WINDS FROM THE STORMS, BUT MOST CONVECTION IS EXPECTED LATE IN THE EVENING INTO THE OVERNIGHT HOURS. A HOT AND DRY PATTERN IS EXPECTED TO RESUME FROM THE SETTLING SURFACE RIDGE BY SUNDAY AFTERNOON AND A MID LEVEL RIDGE IS EXPECTED TO HOLD OFF ADDITIONAL NW FLOW ACTIVITY MONDAY. BY TUESDAY, A WEAK SHEAR AXIS IS EXPECTED TO DEVELOP WHICH COULD BRING A MORE PROMISING RAIN EVENT HOWEVER, THE FEATURE IS POORLY AGREED UPON BY MODELS, AND THE QPF FROM MODELS CONTINUES TO SHOW LOW AMOUNTS. THIS FEATURE MAY BE COMPLICATED BY THE DEVELOPMENT OF A TROPICAL WAVE OVER THE WESTERN GULF AS DEPICTED BY THE 00Z NAM/18Z DGEX. THUS WILL AGAIN STAY CONSERVATIVE WITH POPS. THE WEAKENED RIDGE ALOFT WILL MAKE FOR A VAGUE FORECAST IN THE EXTENDED WITH CONTINUED HOT DAYS AND SLIGHT CHANCE DIURNAL POPS MAINLY OVER THE COASTAL PRAIRIES. && .PRELIMINARY POINT TEMPS/POPS... AUSTIN CAMP MABRY 97 71 97 71 95 / 20 30 10 - - AUSTIN BERGSTROM INTL AIRPORT 96 68 96 67 96 / 20 30 10 - - DEL RIO INTL AIRPORT 100 75 98 74 99 / 10 20 20 - - SAN ANTONIO INTL AIRPORT 97 73 96 72 95 / 10 30 20 - - && .EWX WATCHES/WARNINGS/ADVISORIES... NONE. && 04/03
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 620 AM CDT SAT JUN 21 2008 TXZ171>173-183>194-202>209-217>225-228-221100- 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- 620 AM CDT SAT JUN 21 2008 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL TEXAS. .DAY ONE...TODAY AND TONIGHT... BRIEF STRONG WIND GUSTS ARE POSSIBLE FROM WIDELY SCATTERED AFTERNOON TO EVENING THUNDERSTORMS. NO HAZARDOUS WEATHER IS EXPECTED LATE TONIGHT OR TOWARD THE EARLY MORNING ON SUNDAY. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY... SCATTERED AFTERNOON TO EARLY EVENING SHOWERS OR THUNDERSTORMS ARE POSSIBLE OVER THE EAST PART OF SOUTH CENTRAL TEXAS ON TUESDAY AND WEDNESDAY...OTHERWISE NO HAZARDOUS WEATHER IS EXPECTED. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
The Austin/San Antonio radar (KEWX), 63 km away, was scanning. The volume nearest the first event began at 19:01 UTC.
2 thunderstorm wind, 2 hail. Local standard time, as filed.
Power lines and power poles were reported down in portions of South Austin near the Interstate 35 and Highway 71 interchange.
Hail fell for nearly 20 minutes. Fences were also reported down in the neighborhood.
Public reported nickel size hail at the Shadowglen golf course.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2008Every state in 2008This day in weather historyWarnings in Texas, June 2008
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: 96272, 96268, 96270, 96271.