Alert archive / Texas / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 101, NWS Austin/San Antonio, TX

May 4, 1991Llano County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 4, 1991, 3:08 PM CDT for Llano County, Texas. It was in force for 67 min.

The area

The counties it named.

The facts

Issued
May 4, 1991, 3:08 PM CDT (20:08 UTC)
Expired
May 4, 1991, 4:15 PM CDT
In force
67 min
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

County Llano County, TX

The nearest sounding before it

Stephenville/Cla, TX (KSEP), launched 12:00Z, 8.1 hours before the alert went out and 177 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, Stephenville/Cla, TX at 12:00Z on 1991-05-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1326 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, Stephenville/Cla, TX at 12:00Z on 1991-05-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 64 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
1326 J/kg
Mixed-layer CIN
-216 J/kg
Mixed-layer LCL
898 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
64 m²/s²
0-3 km storm-relative helicity
81 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KAUS 042010
SVRAUS
TXC299-042115-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN TX
308 PM CDT SAT MAY 4 1991
 
THE NATIONAL WEATHER SERVICE IN AUSTIN HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  415 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTH CENTRAL TEXAS
 
   ...LLANO COUNTY
 
AT 306 PM CDT RADAR SHOWED A SEVERE THUNDERSTORM NEAR OXFORD MOVING
TOWARD THE EAST AT 20 MPH. THIS STORM WILL LIKELY CONTAIN 3/4 INCH
HAIL AND VERY STRONG SURFACE WINDS.
 
A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA.  REMEMBER
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCE WARNING.  REMAIN CALM BUT BE ALERT TO
RAPIDLY CHANGING WEATHER CONDITIONS.

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, May 4, 1:11 PM CDT, 1 hour 57 minutes before
TXZ034-035-038-039-040-054-042000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN ANTONIO TX
110 PM CDT SAT MAY 4 1991

...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR TEXAS HILL COUNTRY AND
   THE EDWARDS PLATEAU THROUGH 3 PM THIS AFTERNOON...
...A FLOOD AND FLASH FLOOD WATCH IS IN EFFECT FOR MOST OF SOUTH CENTRAL
   AND SOUTHEAST TEXAS THROUGH TONIGHT...

SCATTERED SHOWERS AND THUNDERSTORMS CONTINUED AT 105 PM IN AN AREA NORTH
OF DEL RIO TO ROCKSPRINGS TO AUSTIN LINE.  LITTLE CHANGE IN MOVEMENT HAD
OCCURRED IN THE PAST HOUR.  THE AREA WAS STILL MOVING TO THE EAST AT 15
MPH WHILE THE INDIVIDUAL STORMS WERE MOVING TO THE NORTHEAST AT 20 MPH.

HEAVY RAIN WAS REPORTED BETWEEN JUNCTION AND ROCKSPRINGS AND FROM
ROCKSPRINGS SOUTHWARD TO NEAR BRACKETTVILLE.  THESE STORMS HAD FORMED
ALONG THE EDGE OF A TROUGH OF LOW PRESSURE AND MUCH DRIER AIR MOVING IN
FROM THE WEST.  RAINFALL AVERAGES ACROSS EDWARDS COUNTY ARE ESTIMATED AT
1/2 TO 3/4 INCH WITH ISOLATED LOCATIONS HAVING RECEIVED NEARLY 2 INCHES.
RAINFALL FROM 10 AM TO NOON HAD BEEN OVER THE WESTERN THIRD OF THE
COUNTY...WELL WEST OF THE CITY OF ROCKSPRINGS.  RAINFALL SINCE NOON HAS
BEEN IN THE CENTRAL AND EASTERN SECTIONS OF THE COUNTY...INCLUDING THE
CITY OF ROCKSPRINGS.  SMALL HAIL WAS REPORTED IN THIS AREA OF STRONG
THUNDERSTORMS JUST SOUTH OF SONORA AROUND 1230 PM.  PEA-SIZED TO
MARBLE-SIZED HAIL WAS REPORTED AT JUNCTION NEAR 100 PM.

AN UPPER LEVEL DISTURBANCE NEAR THE TEXAS BIG BEND THIS AFTERNOON HAS
CONTINUED TO MOVE NORTHEASTWARD.  IT WILL BE IN A POSITION TO HELP
PRODUCE SEVERE WEATHER OVER THE HILL COUNTRY AND EDWARDS PLATEAU THIS
AFTERNOON.
Special weather statement, May 4, 1:41 PM CDT, 1 hour 27 minutes before
TXZ054-042000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DEL RIO TX
142 PM CDT SAT MAY 4 1991

...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR VAL VERDE COUNTY
UNTIL 300 PM...

AT 135 PM CDT RADAR INDICATED NO PRECIPITATION IN VAL VERDE COUNTY. THE
THUNDERSTORMS REPORTED EARLIER HAVE MOVED EAST OF THE COUNTY AND WERE
LOCATED FROM BRACKETVILLE TO ROCKSPRINGS AND FURTHER NORTH. MOVEMENT WAS
TO THE EAST AT 15 MPH.

LARGE HAIL...DANGEROUS LIGHTNING AND DAMAGING THUNDERSTORM WINDS ARE
POSSIBLE WITH THESE STORMS.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE
FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. PERSONS IN
THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS
AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS.

STAY TUNED TO NOAA WEATHER RADIO...LOCAL RADIO AND TV STATIONS FOR
FURTHER INFORMATION.
Special weather statement, May 4, 1:44 PM CDT, 1 hour 24 minutes before
TXZ030-034>037-042030

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN TX
132 PM CDT SAT MAY 04 1991

...SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 4 PM CDT FOR ALL OF
   CENTRAL TEXAS...
...FLASH FLOOD WATCH IN EFFECT THROUGH TONIGHT...

AT 129 PM CDT...RADAR SHOWED A LINE OF STRONG THUNDERSTORMS FROM DEL RIO TO
EAST OF JUNCTION CITY TO EAST OF ABILENE.  THIS LINE OF STORMS WAS MOVING TOWARDTHE EAST AT 15 MPH AND WILL BE AFFECTING MILLS...LAMPASAS...LLANO..AND
GILLESPIE COUNTIES DURING THE NEXT SEVERAL HOURS.

OTHER SHOWERS AND THUNDERSTORMS STRETCHED ACROSS CENTRAL TEXAS FROM MARBLE
FALLS EASTWARD THROUGH BARTLETT TO COLLEGE STATION.  MOVEMENT WAS TOWARD THE
NORTHEAST AT 25 MPH.

PEA TO MARBLE SIZED HAIL HAS BEEN REPORTED AT JUNCTION WITH THE THUNDERSTORMS
TO THE WEST.  HEAVY RAINFALL WILL ALSO POSE A THREAT DUE TO THE SLOW MOVEMENT
OF THE LINE OF THUNDERSTORMS.  A FLASH FLOOD WATCH REMAINS IN EFFECT FOR ALL
OF CENTRAL TEXAS AND THE HILL COUNTRY...SO STAY TUNED TO THE LATEST
UPDATES ON THIS DANGEROUS WEATHER SITUATION.
Special weather statement, May 4, 1:59 PM CDT, 1 hour 9 minutes before
TXZ054-042000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DEL RIO TX
200 PM CDT SAT MAY 4 1991

...THE SEVERE THUNDERSTORM WATCH FOR VAL VERDE COUNTY HAS BEEN
CANCELED...

AT 158 PM CDT RADAR INDICATED NO PRECIPITATION IN VAL VERDE COUNTY. THE
THUNDERSTORMS REPORTED EARLIER HAVE MOVED EAST OF THE COUNTY AND WERE
LOCATED FROM BRACKETVILLE TO ROCKSPRINGS AND FURTHER NORTH. MOVEMENT WAS
TO THE EAST AT 15 MPH.
Special weather statement, May 4, 2:51 PM CDT, 17 minutes before
TXZ030-034>036-042045

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN TX
243 PM CDT SAT MAY 04 1991

...TORNADO WATCH HAS BEEN ISSUED MILLS...SAN SABA...LAMPASAS...LLANO...
   BURNET...WILLIAMSON...GILLESPIE...BLANCO...HAYS...CALDWELL...BASTROP...
   AND TRAVIS...UNTIL 9PM CDT...
...SEVERE THUNDERSTORM WATCH FOR CENTRAL TEXAS HAS BEEN CANCELLED...
...FLASH FLOOD WATCH FOR SOUTH CENTRAL TEXAS AND ADJACENT HILL COUNTRY
   THROUGH TONIGHT...

AT 240 PM CDT...RADAR SHOWED A LINE OF THUNDERSTORMS FROM NORTHEAST OF DEL
RIO TO HARPER TO LLANO CITY TO STAR.  THIS LINE OF THUNDERSTORMS WAS MOVING
TOWARD THE EAST AT 20 MPH.  A THUNDERSTORM PRODUCING SMALL HAIL...VERY GUSTY
SURFACE WINDS...AND VERY HEAVY RAINFALL WAS LOCATED OVER NORTH CENTRAL
GILLESPIE COUNTY AND LLANO COUNTY.
.
.
.
THESE THUNDERSTORMS WILL BE MOVING OVER THE LAKE BUCHANAN VICINITY
BETWEEN 2 PM AMD 230 PM CDT.  PERSONS ON THE LAKE SHOULD IMMEDIATELY
RETURN TO SHOlRE AND SEEK A PLACE OF SHELTER.

STAY TUNED FOR LATER STATEMENTS AND POSSIBLE WARNINGS.
Special weather statement, May 4, 2:58 PM CDT, 10 minutes before
TXZ030-034>036-042045

SPECIAL WEATHER STATEMENT...CORRECTION FOR TIME
NATIONAL WEATHER SERVICE AUSTIN TX
243 PM CDT SAT MAY 04 1991

...TORNADO WATCH HAS BEEN ISSUED MILLS...SAN SABA...LAMPASAS...LLANO...
   BURNET...WILLIAMSON...GILLESPIE...BLANCO...HAYS...CALDWELL...BASTROP...
   AND TRAVIS...UNTIL 9PM CDT...
...SEVERE THUNDERSTORM WATCH FOR CENTRAL TEXAS HAS BEEN CANCELLED...
...FLASH FLOOD WATCH FOR SOUTH CENTRAL TEXAS AND ADJACENT HILL COUNTRY
   THROUGH TONIGHT...

AT 240 PM CDT...RADAR SHOWED A LINE OF THUNDERSTORMS FROM NORTHEAST OF DEL
RIO TO HARPER TO LLANO CITY TO STAR.  THIS LINE OF THUNDERSTORMS WAS MOVING
TOWARD THE EAST AT 20 MPH.  A THUNDERSTORM PRODUCING SMALL HAIL...VERY GUSTY
SURFACE WINDS...AND VERY HEAVY RAINFALL WAS LOCATED OVER NORTH CENTRAL
GILLESPIE COUNTY AND LLANO COUNTY.
.
.
.
THESE THUNDERSTORMS WILL BE MOVING OVER THE LAKE BUCHANAN VICINITY
BETWEEN 3 PM AMD 330 PM CDT.  PERSONS ON THE LAKE SHOULD IMMEDIATELY
RETURN TO SHORE AND SEEK A PLACE OF SHELTER.

STAY TUNED FOR LATER STATEMENTS AND POSSIBLE WARNINGS.

The office that day

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

IssuedProductOfficeCountiesLasted
May 3, 7:08 PM CDTSevere Thunderstorm WarningEWXBurnet, Llano, San Saba67 min
May 3, 8:49 PM CDTSevere Thunderstorm WarningEWXWilliamson56 min
May 3, 11:45 PM CDTSevere Thunderstorm WarningEWXLee45 min
May 4, 4:09 PM CDTSevere Thunderstorm WarningEWXBexar66 min
May 4, 4:12 PM CDTSevere Thunderstorm WarningEWXBlanco48 min
May 4, 4:40 PM CDTSevere Thunderstorm WarningEWXHays50 min
May 4, 4:46 PM CDTSevere Thunderstorm WarningEWXComal59 min
May 4, 4:49 PM CDTSevere Thunderstorm WarningEWXTravis, Williamson41 min
May 4, 4:55 PM CDTSevere Thunderstorm WarningEWXGuadalupe65 min
May 4, 5:13 PM CDTSevere Thunderstorm WarningEWXTravis62 min
May 4, 6:15 PM CDTSevere Thunderstorm WarningEWXGonzales60 min
May 4, 6:25 PM CDTSevere Thunderstorm WarningEWXBastrop50 min
May 4, 6:42 PM CDTTornado WarningEWXGonzales33 min
May 4, 6:58 PM CDTTornado WarningEWXDeWitt, Lavaca62 min

Nearby

Severe Thunderstorm Warnings in Texas, 1991Every severe thunderstorm warning in 1991

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.