Alert archive / Texas / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 50, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 25, 1997, 11:11 AM CDT for Blanco County, Texas. It was in force for 64 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Apr 25, 1997, 11:11 AM CDT (16:11 UTC)
- Expired
- Apr 25, 1997, 12:15 PM CDT
- In force
- 64 min
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Whole counties
County Blanco County, TX
The nearest sounding before it
Del Rio, TX (KDRT), launched 12:00Z, 4.2 hours before the alert went out and 256 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1194 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 558 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 236 m²/s²
- 0-3 km storm-relative helicity
- 249 m²/s²
- Significant tornado parameter
- 1.4
- Supercell composite
- 7.2
The text
As transmitted, in the capitals the NWS used until 2016.
502 WUUS1 KSAT 251613 RRA SVRSAT TXC031-251715- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 1111 AM CDT FRI APR 25 1997 THE NATIONAL WEATHER SERVICE IN AUSTIN/SAN ANTONIO HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1215 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTH CENTRAL TEXAS ...BLANCO COUNTY AT 1110 AM NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE THUNDERSTORM WEST OF ROUND MOUNTAIN MOVING TO THE NORTHEAST AT 20 TO 25 MPH. THIS STORM WILL PASS OVER OR JUST TO THE NORTH OF ROUND MOUNTAIN IN THE NEXT 20 MINUTES. WIND SPEEDS NEAR 50 MPH CAN BE EXPECTED WITH THIS STORM. PEOPLE IN THE PATH OF THIS STORM SHOULD BE ALERT TO THE POSSIBILITY OF LARGE HAIL AND DAMAGING WINDS. FREQUENT LIGHTNING AND LOCALLY HEAVY RAIN CAN ALSO OCCUR WITH SEVERE THUNDERSTORMS...FLOODING SMALL STREAMS...LOW AREAS...AND LOW WATER CROSSINGS. &
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Apr 25, 5:39 AM CDT, 5 hours 32 minutes before
TXZ171>173-183>194-202>209-217>225-228-252300- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 530 AM CDT FRI APR 25 1997 THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS PRODUCING LARGE HAIL... DAMAGING WINDS AND ISOLATED TORNADOES TODAY AND TONIGHT ACROSS ALL OF SOUTH CENTRAL TEXAS AND THE HILL COUNTRY. AS A MAJOR STORM SYSTEM CONTINUES TO ORGANIZE OVER WEST TEXAS AND MOVE SLOWLY SOUTH INTO MEXICO AND THE RIO GRANDE CONDITIONS WILL BECOME INCREASINGLY FAVORABLE FOR SEVERE WEATHER AND LOCALLY HEAVY RAINFALL TODAY AND TONIGHT. A NUMEROUS SHOWERS AND THUNDERSTORMS THROUGH THE PERIOD WILL PRODUCE A GENERAL 1 TO 2 INCH RAINFALL WITH STRONGEST STORMS PRODUCING 3 INCHES OF RAIN IN A SHORT PERIOD OF TIME. THIS MORNING...SEVERE WEATHER WAS ONGOING OVER SOUTHWEST TEXAS. AS THE DEEP LOW PRESSURE SYSTEM NEAR SANDERSON MOVES SOUTH INTO NORTHEAST MEXICO THIS MORNING...STRONG AND POSSIBLY SEVERE THUNDERSTORMS WILL EFFECT WESTERN PORTIONS OF THE EDWARDS PLATEAU. DURING THE AFTERNOON...TEMPERATURES WILL CLIMB INTO THE 70S AND GULF MOISTURE WILL INCREASE AREA-WIDE IMPROVING THE RISK OF SEVERE WEATHER ACROSS ALL OF SOUTH CENTRAL TEXAS AND THE HILL COUNTRY. STORMS WILL LIKELY DEVELOP OVER THE SIERRA MADRE IN MEXICO... RIO GRANDE PLAINS OR THE HILL COUNTRY AND MOVE RAPIDLY NORTHEAST ACROSS THE AREA. TONIGHT...THE SEVERE WEATHER PATTERN MAY EVOLVE INTO A HEAVY RAIN EVENT. A SLOW MOVING COLD FRONT WILL BE APPROACHING THE HILL COUNTRY AND COULD ACT AS A FOCUS FOR ADDITIONAL HEAVY RAIN. A FLASH FLOOD WATCH MAY BE REQUIRED ACROSS SOME AREAS OF SOUTH TEXAS AND THE HILL COUNTRY TONIGHT. THE DANGER OF NIGHTTIME HEAVY RAIN EVENTS CANNOT BE OVERSTATED. SINCE OCTOBER 1996...4 SOUTH TEXANS HAVE PERISHED IN AUTOMOBILES DIRECTLY RELATED TO FLASH FLOODING. ALL OF THE FATALITIES OCCURRED WHEN AUTOMOBILES WERE SWEPT FROM THE ROADWAY BY RAGING FLOOD WATERS IN THE DARKNESS OF NIGHT. RESIDENTS OF SOUTH CENTRAL TEXAS...INCLUDING THE EDWARDS PLATEAU AND HILL COUNTRY...SHOULD MONITOR THE LATEST FORECASTS AND ADVISORIES. THIS IS A POWERFUL STORM SYSTEM PRODUCING RAPID CHANGES IN THE WEATHER. BE PREPARED TO MOVE TO A PLACE OF SAFETY IF SEVERE WEATHER IS SIGHTED OR A WATCH OR WARNING IS ISSUED. THE NATIONAL WEATHER SERVICE WILL ADVISE YOU OF THE VERY LATEST DEVELOPING SEVERE WEATHER POTENTIAL VIA NOAA WEATHER RADIO... LOCAL TV... CABLE TV... RADIO... AND OUR INTERNET WEBSITE LOCATED AT WWW.SRH.NOAA.GOV.EWX THE HAZARDOUS WEATHER OUTLOOK WILL NORMALLY BE UPDATED BY MEANS OF THE ZONE FORECAST...SHORT TERM FORECASTS...WATCHES...WARNINGS AND ADVISORIES. THE HAZARDOUS WEATHER OUTLOOK ITSELF WILL BE UPDATED ONLY IF UNFORECAST HAZARDOUS WEATHER DEVELOPS OR IF FORECAST HAZARDOUS WEATHER IS NO LONGER EXPECTED.
The office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 25, 8:33 AM CDT | Flash Flood Warning | EWX | Val Verde | 117 min |
| Apr 25, 10:20 AM CDT | Flash Flood Warning | EWX | Edwards | 115 min |
| Apr 25, 11:17 AM CDT | Severe Thunderstorm Warning | EWX | Burnet | 58 min |
| Apr 25, 11:52 AM CDT | Flash Flood Warning | EWX | Blanco, Burnet, Llano | 4 hr |
| Apr 25, 1:10 PM CDT | Flash Flood Warning | EWX | Gillespie | 6 hr |
| Apr 25, 1:53 PM CDT | Severe Thunderstorm Warning | EWX | Caldwell | 67 min |
| Apr 25, 2:30 PM CDT | Severe Thunderstorm Warning | EWX | Bexar | 60 min |
| Apr 25, 2:41 PM CDT | Flash Flood Warning | EWX | Bastrop, Caldwell | 4 hr |
| Apr 25, 2:47 PM CDT | Flash Flood Warning | EWX | Travis, Williamson | 4 hr |
| Apr 25, 3:24 PM CDT | Flash Flood Warning | EWX | Fayette | 4 hr |
| Apr 25, 3:59 PM CDT | Flash Flood Warning | EWX | Gonzales | 3 hr |
| Apr 25, 5:16 PM CDT | Flash Flood Warning | EWX | Lavaca | 3 hr |
Nearby
Severe Thunderstorm Warnings in Texas, 1997Every severe thunderstorm warning in 1997
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.