1 thunderstorm wind, as filed by the National Weather Service.
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 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 Aug 21, 2:30 PM CST, 1 hour earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 330 PM CDT SAT AUG 21 2004 .DISCUSSION... CONVECTION ON ALL FRONTS THIS AFTN AS S TX SITS ON THE NW PERIPHERY OF THE GULF RDG. THE AREA OF MOST CONCERN CONTS BE THE PERSISTENT ORGANIZED CONVECTION OVR CENTRAL TX/NRN HILL COUNTRY...WHERE DISTURBANCES IN THE WEAK WESTERLY FLOW INTERACT WITH SFC BOUNDARIES FROM THE MCS. WITH PWS NR 2 INCHES THIS MORNING...GOOD SLY LOW LVL INFLOW...AND A BOUNDARY NEARLY PARALLEL TO THE MID LEVEL WINDS...AM CONCERNED ABOUT THE HEAVY RAIN POTENTIAL OVERNIGHT. NEITHER THE GFS OR ETA SHOW ANY SIGNIFICANT QPF THAT WOULD WARRANT AN FFA ATTM... HOWEVER THE 18Z MESO-ETA SHOWS SOME PERSISTENT QPF DEVELOPING OVER THE RIO GRANDE PLAINS TONIGHT INVOF A WEAK UPR TROF THAT TRACKS NEWD ACRS THE CWA SUNDAY. WILL GO WITH GOOD CHC POPS ACRS THE HILL COUNTRY/WRN CWA TONIGHT WITH THE MENTION OF LOCALLY HEAVY RAIN...AND CHC POPS ACRS THE REST OF THE AREA...THEN CONT CHC POPS AREAWIDE SUNDAY...TAPERING POPS TO ISOLD/SLGT CHC BY MONDAY-TUESDAY AS S TX COMES MORE UNDER THE INFLUENCE OF THE UPR RDG. ANOTHER CHC OF STORMS BY WEDNESDAY WITH A S/W TROF KICKING OUT ACRS W TX. WILL LEAVE LOW SEASONAL POPS IN MAINLY FOR THE ERN COUNTIES LATE NEXT WEEK AS RIDGING WILL PREVAIL...WITH A TROF SLIDING NORTH OF THE AREA SATURDAY. && .PRELIMINARY POINT TEMPS/POPS... AUSTIN CAMP MABRY 73 93 75 95 / 40 30 20 5 AUSTIN BERGSTROM INTL AIRPORT 72 92 73 95 / 40 30 20 5 DEL RIO INTL AIRPORT 77 95 76 97 / 40 20 10 5 SAN ANTONIO INTL AIRPORT 76 93 77 94 / 40 30 20 5 && .EWX WATCHES/WARNINGS/ADVISORIES...NONE. && 01/11
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 546 AM CDT SAT AUG 21 2004 TXZ171>173-183>194-202>209-217>225-228-221046- ATASCOSA-BANDERA-BASTROP-BEXAR-BLANCO-BURNET-CALDWELL-COMAL-DEWITT- DIMMIT-EDWARDS-FAYETTE-FRIO-GILLESPIE-GONZALES-GUADALUPE-HAYS-KARNES- KENDALL-KERR-KINNEY-LAVACA-LEE-LLANO-MAVERICK-MEDINA-REAL-TRAVIS- UVALDE-VAL VERDE-WILLIAMSON-WILSON-ZAVALA- 546 AM CDT SAT AUG 21 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL TEXAS. .DAY ONE...TODAY. SCATTERED THUNDERSTORMS CAN BE EXPECTED ACROSS THE HILL COUNTRY AND SOUTH CENTRAL TEXAS. THE PRIMARY THREATS ARE LOCALLY HEAVY RAINFALL AND DEADLY LIGHTNING. THE SECONDARY THREATS ARE ISOLATED STRONG WIND GUSTS TO 50 MPH. OTHERWISE...NO HAZARDOUS WEATHER IS EXPECTED. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. CHANCES OF THUNDERSTORMS WILL SLOWLY DECREASE. OTHERWISE...NO HAZARDOUS WEATHER IS EXPECTED. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED.
The Austin/San Antonio radar (KEWX), 16 km away, was scanning. The volume nearest the first event began at 21:27 UTC.
1 thunderstorm wind. Local standard time, as filed.
Downburst winds blew down trees and tree limbs that knocked out power lines in Seguin.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2004Every state in 2004This day in weather historyWarnings in Texas, August 2004
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: 5420604.