Alert archive / Texas / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 33, NWS Austin/San Antonio, TX

April 4, 1997Bexar County, Kendall County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 4, 1997, 5:11 PM CST for Bexar County, Kendall County, Texas. It was in force for 79 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, 5:11 PM CST (23:11 UTC)
Expired
Apr 4, 1997, 6:30 PM CST
In force
79 min
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

Counties Bexar County, TX, Kendall County, TX

The radar

The Austin/San Antonio radar (KEWX), 57 km from the middle of the area, began a volume at 23:10 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, 6:05 PM CSTHail 1San Antonio, TXHail was reported by Amateur Radio spotters in northwest San Antonio (near NW Military Drive and Lockhill Selma.)

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, 3:00 PM CSTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 11.2 hours before the alert went out and 218 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, Del Rio, TX at 12:00Z on 1997-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1922 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, Del Rio, TX at 12:00Z on 1997-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 213 square meters per square second.1939587897117136Sfc1 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
1922 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
580 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
213 m²/s²
0-3 km storm-relative helicity
198 m²/s²
Significant tornado parameter
2.5
Supercell composite
10.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSAT 042314 RRA
SVRSAT
TXC029-259-050030-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
511 PM CST FRI APR 4 1997
 
THE NATIONAL WEATHER SERVICE IN AUSTIN/SAN ANTONIO HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 630 PM CST
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTH CENTRAL TEXAS
 
   ...BEXAR COUNTY...KENDALL COUNTY
 
AT SEVERE THUNDERSTORM MOVING NEAR MICO ON MEDINA LAKE WAS MOVING INTO
NORTHWEST BEXAR COUNTY AND SOUTHERN KENDALL COUNTY BETWEEN HELOTES AND
BOERNE. THIS IS A DANGEROUS STORM WHICH LIKELY CONTAINS DAMAGING
WINDS...POSSIBLE LARGE HAIL...AND VERY HEAVY RAIN. RAINFALL RATES OF 1
TO 2 INCHES ARE INDICATED WITH THIS STORM.
 
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.
 
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.
 
IF YOU SEE SEVERE 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, 11:47 AM CST, 5 hours 24 minutes before
TXZ171>173-183>194-202>209-217>225-228-051200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1147 AM CST FRI APR 4 1997

...STORMY EARLY APRIL AFTERNOON OVER THE HILL COUNTRY AND SOUTH CENTRAL
TEXAS...

AN INTENSE SPRING WEATHER SYSTEM TO THE WEST OF THE AREA WILL MOVE
EAST CAUSING MORE DEVELOPMENT OF SHOWERS AND THUNDERSTORMS THIS
AFTERNOON AND THIS EVENING.  AT 1147 AM...STORMS ARE RAPIDLY FORMING
WEST AND NORTHWEST OF DEL RIO...BEGINNING TO DEVELOP A LINE OF
SHOWERS AND THUNDERSTORMS...WHICH WILL MOVE EAST AND AFFECT SOUTH
CENTRAL TEXAS AND THE HILL COUNTRY THIS AFTERNOON.  A SEVERE
THUNDERSTORM WARNING IS IN EFFECT FOR VAL VERDE COUNTY TIL 1230 PM.

SEVERE THUNDERSTORMS ARE POSSIBLE WITH THIS EARLY APRIL WEATHER
SYSTEM...CAUSING DAMAGING WINDS AND HAIL.  ADDITIONAL RAINFALL
AMOUNTS OF 2 TO 3 INCHES IN SOME AREAS IS POSSIBLE BY THE
TIME THE EVENT ENDS THIS EVENING.

AS THE WEATHER SYSTEMS SWEEPS EAST OF THE AREA...A MOSTLY SUNNY
DAY IS EXPECTED SATURDAY...FOLLOWED BY A SUNNY TO PARTLY CLOUDY
ON SUNDAY.
Special weather statement, Apr 4, 11:51 AM CST, 5 hours 20 minutes before
TXZ171>173-183>194-202>209-217>225-228-051200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1147 AM CST FRI APR 4 1997

...STORMY EARLY APRIL AFTERNOON OVER THE HILL COUNTRY AND SOUTH CENTRAL
TEXAS...

AN INTENSE SPRING WEATHER SYSTEM TO THE WEST OF THE AREA WILL MOVE
EAST CAUSING MORE DEVELOPMENT OF SHOWERS AND THUNDERSTORMS THIS
AFTERNOON AND THIS EVENING.  AT 1147 AM...STORMS ARE RAPIDLY FORMING
WEST AND NORTHWEST OF DEL RIO...BEGINNING TO DEVELOP A LINE OF
SHOWERS AND THUNDERSTORMS...WHICH WILL MOVE EAST AND AFFECT SOUTH
CENTRAL TEXAS AND THE HILL COUNTRY THIS AFTERNOON.  A SEVERE
THUNDERSTORM WARNING IS IN EFFECT FOR VAL VERDE COUNTY TIL 1230 PM.

SEVERE THUNDERSTORMS ARE POSSIBLE WITH THIS EARLY APRIL WEATHER
SYSTEM...CAUSING DAMAGING WINDS AND HAIL.  ADDITIONAL RAINFALL
AMOUNTS OF 2 TO 3 INCHES IN SOME AREAS IS POSSIBLE BY THE
TIME THE EVENT ENDS THIS EVENING.

AS THE WEATHER SYSTEMS SWEEPS EAS~T OF THE AREA...A MOSTLY SUNNY
DAY IS EXPECTED SATURDAY...FOLLOWED BY A SUNNY TO PARTLY CLOUDY
ON SUNDAY.

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 3, 8:33 PM CSTFlash Flood WarningEWXDimmit42 min
Apr 3, 8:33 PM CSTSevere Thunderstorm WarningEWXDimmit42 min
Apr 3, 9:18 PM CSTSevere Thunderstorm WarningEWXMedina, Zavala57 min
Apr 3, 10:36 PM CSTFlash Flood WarningEWXGillespie69 min
Apr 3, 10:47 PM CSTFlash Flood WarningEWXKerr58 min
Apr 3, 11:10 PM CSTSevere Thunderstorm WarningEWXBexar65 min
Apr 3, 11:32 PM CSTSevere Thunderstorm WarningEWXComal58 min
Apr 3, 11:55 PM CSTSevere Thunderstorm WarningEWXHays65 min
Apr 4, 12:25 AM CSTFlash Flood WarningEWXWilliamson65 min
Apr 4, 12:25 AM CSTSevere Thunderstorm WarningEWXWilliamson65 min
Apr 4, 12:43 AM CSTSevere Thunderstorm WarningEWXHays62 min
Apr 4, 1:17 AM CSTFlash Flood WarningEWXDeWitt, Lavaca3 hr
Apr 4, 1:34 AM CSTFlash Flood WarningEWXTravis, Williamson116 min
Apr 4, 5:36 AM CSTFlash Flood WarningEWXLavaca3 hr
Apr 4, 6:23 AM CSTFlash Flood WarningEWXTravis, Williamson3 hr
Apr 4, 6:31 AM CSTFlash Flood WarningEWXBlanco3 hr
Apr 4, 6:43 AM CSTFlash Flood WarningEWXKendall3 hr
Apr 4, 9:24 AM CSTFlash Flood WarningEWXTravis, Williamson3 hr
Apr 4, 10:12 AM CSTFlash Flood WarningEWXDeWitt2 hr
Apr 4, 11:30 AM CSTSevere Thunderstorm WarningEWXVal Verde60 min
Apr 4, 2:34 PM CSTSevere Thunderstorm WarningEWXUvalde56 min
Apr 4, 2:40 PM CSTSevere Thunderstorm WarningEWXReal65 min
Apr 4, 3:00 PM CSTFlash Flood WarningEWXReal2 hr
Apr 4, 3:25 PM CSTFlash Flood WarningEWXBandera65 min
Apr 4, 3:25 PM CSTSevere Thunderstorm WarningEWXBandera65 min
Apr 4, 3:32 PM CSTFlash Flood WarningEWXUvalde58 min
Apr 4, 3:32 PM CSTSevere Thunderstorm WarningEWXUvalde58 min
Apr 4, 3:53 PM CSTFlash Flood WarningEWXKerr2 hr
Apr 4, 4:24 PM CSTFlash Flood WarningEWXBandera2 hr
Apr 4, 4:34 PM CSTSevere Thunderstorm WarningEWXMedina56 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.