Alert archive / Texas / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 38, NWS Austin/San Antonio, TX

April 4, 1997DeWitt County, Karnes County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 4, 1997, 10:54 PM CST for DeWitt County, Karnes County, Texas. It was in force for 51 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Apr 4, 1997, 10:54 PM CST (04:54 UTC)
Expired
Apr 4, 1997, 11:45 PM CST
In force
51 min
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

Counties DeWitt County, TX, Karnes County, TX

The radar

The Austin/San Antonio radar (KEWX), 89 km from the middle of the area, began a volume at 04:54 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Apr 4, 11:15 PM CSTThunderstorm WindRunge, TXWidespread damage was reported to trees in the Runge area, with many trees blown over by the damaging winds.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 4, 7:15 PM CSTTornado WatchSPC6 hr

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 00:00Z, 4.9 hours before the alert went out and 143 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.

Skew-T log-pSkew-T log-p diagram, Corpus Christi, TX at 00:00Z on 1997-04-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3317 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Corpus Christi, TX at 00:00Z on 1997-04-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 126 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
3317 J/kg
Mixed-layer CIN
-46 J/kg
Mixed-layer LCL
663 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
126 m²/s²
0-3 km storm-relative helicity
107 m²/s²
Significant tornado parameter
2.1
Supercell composite
10.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KSAT 050456 RRA
SVRSAT
TXC123-255-050545-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1054 PM CST FRI APR 4 1997
 
THE NATIONAL WEATHER SERVICE IN AUSTIN/SAN ANTONIO HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1145 PM CST
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTH CENTRAL TEXAS
 
   ...DE WITT COUNTY...KARNES COUNTY
 
AT 1055 PM CST WEATHER RADAR INDICATED A SEVERE THUNDERSTORM APPROACHING
THE SOUTHERN PORTION OF KARNES COUNTY. THIS STORM WAS MOVING NORTHEAST
AT 50 MPH AND WILL RACE ACROSS SOUTHERN KARNES AND DEWITT COUNTIES.
 
ALTHOUGH NO TORNADOES HAVE BEEN DETECTED WITH THIS STORM...A
TORNADO WATCH REMAINS IN EFFECT.  SEVERE THUNDERSTORMS CAN AND
OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING
SO BE ON THE LOOKOUT.
 
SEVERE THUNDERSTORM WINDS CAN REACH SPEEDS OVER 60 MPH.  THESE WINDS
BLOW DOWN TREES...POWER LINES...AND SEVERELY DAMAGE MOBILE HOMES...
SOMETIMES BUILDINGS.  VERY LARGE HAIL CAN INJURE ANYONE CAUGHT
OUTSIDE.
 
IF YOU SEE SEVERE WEATHER TAKING PLACE...CALL YOUR REPORT TO
THE NEAREST LAW ENFORCEMENT AGENCY FOR IMMEDIATE RELAY TO THE
NATIONAL WEATHER SERVICE.

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 4, 6:19 PM CST, 4 hours 35 minutes before
TXZ171>173-183>194-202>209-217>225-228-051215-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
619 PM CST FRI APR 4 1997

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WATCH
FOR THE TEXAS HILL COUNTRY AND PORTIONS OF SOUTH CENTRAL TEXAS UNTIL
9 PM TONIGHT.

A SEVERE THUNDERSTORM WATCH MEANS THAT WEATHER CONDITIONS ARE
FAVORABLE FOR LARGE HAIL AND DAMAGING WINDS.

THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WATCH TONIGHT
FOR SOUTH CENTRAL TEXAS AND THE TEXAS HILL COUNTRY.

A FLASH FLOOD WATCH MEANS WEATHER CONDITIONS ARE FAVORABLE FOR HEAVY
RAIN... FLASH FLOODING... AND RIVER FLOODING IN OR NEAR THE WATCH
AREA.

A STRONG UPPER LEVEL STORM SYSTEM IS MOVING EAST LATE THIS AFTERNOON
AND IS LOCATED JUST WEST OF THE BIG BEND AREA.  THE ATMOSPHERE HAS
BECOME EXTREMELY UNSTABLE AS VERY COLD ALOFT IS APPROACHING SOUTH
TEXAS.  IN ADDITION...THE AIRMASS REMAINS VERY MOIST.

THE STORM SYSTEM WILL PASS OVER SOUTH CENTRAL TEXAS AND THE TEXAS
HILL COUNTRY TONIGHT.  SHOWERS AND THUNDERSTORMS WILL CONTINUE
THROUGH THE EVENING AND INTO THE EARLY NIGHTTIME HOURS.  SEVERE
THUNDERSTORMS WITH LARGE HAIL AND DAMAGING WINDS ARE POSSIBLE.
RAINFALL TOTALS WILL AVERAGE 1 TO 2 INCHES WITH ISOLATED TOTALS
APPROACHING 4 INCHES.

AREAS WET FROM RECENT HEAVY RAINS ARE AT PRIME RISK OF FLOODING IF
HEAVY RAIN DEVELOPS.

THE HAZARDOUS WEATHER OUTLOOK NORMALLY WILL BE UPDATED BY MEANS OF
THE ZONE FORECASTS...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 NO LONGER IS EXPECTED.
Special weather statement, Apr 4, 6:20 PM CST, 4 hours 34 minutes before
TXZ171>173-183>194-202>209-217>225-228-051215-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
619 PM CST FRI APR 4 1997

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WATCH
FOR THE TEXAS HILL COUNTRY AND PORTIONS OF SOUTH CENTRAL TEXAS UNTIL
9 PM TONIGHT.

A SEVERE THUNDERSTORM WATCH MEANS THAT WEATHER CONDITIONS ARE
FAVORABLE FOR LARGE HAIL AND DAMAGING WINDS.

THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WATCH TONIGHT
FOR SOUTH CENTRAL TEXAS AND THE TEXAS HILL COUNTRY.

A FLASH FLOOD WATCH MEANS WEATHER CONDITIONS ARE FAVORABLE FOR HEAVY
RAIN... FLASH FLOODING... AND RIVER FLOODING IN OR NEAR THE WATCH
AREA.

A STRONG UPPER LEVEL STORM SYSTEM IS MOVING EAST LATE THIS AFTERNOON
AND IS LOCATED JUST WEST OF THE BIG BEND AREA.  THE ATMOSPHERE HAS
BECOME EXTREMELY UNSTABLE AS VERY COLD ALOFT IS APPROACHING SOUTH
TEXAS.  IN ADDITION...THE AIRMASS REMAINS VERY MOIST.

THE STORM SYSTEM WILL PASS OVER SOUTH CENTRAL TEXAS AND THE TEXAS
HILL COUNTRY TONIGHT.  SHOWERS AND THUNDERSTORMS WILL CONTINUE
THROUGH THE EVENING AND INTO THE EARLY NIGHTTIME HOURS.  SEVERE
THUNDERSTORMS WITH LARGE HAIL AND DAMAGING WINDS ARE POSSIBLE.
RAINFALL TOTALS WILL AVERAGE 1 TO 2 INCHES WITH ISOLATED TOTALS
APPROACHING 4 INCHES.

AREAS WET FROM RECENT HEAVY RAINS ARE AT PRIME RISK OF FLOODING IF
HEAVY RAIN DEVELOPS.

THE HAZARDOUS WEATHER OUTLOOK NORMALLY WILL BE UPDATED BY MEANS OF
THE ZONE FORECASTS...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 NO LONGER IS EXPECTED.

The office that day

Everything else NWS Austin/San Antonio, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 4, 6:09 PM CSTSevere Thunderstorm WarningEWXTravis, Williamson66 min
Apr 4, 7:26 PM CSTSevere Thunderstorm WarningEWXBastrop64 min
Apr 4, 7:33 PM CSTSevere Thunderstorm WarningEWXLee57 min
Apr 4, 8:10 PM CSTSevere Thunderstorm WarningEWXWilson65 min
Apr 4, 11:46 PM CSTSevere Thunderstorm WarningEWXLavaca29 min

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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.