Alert archive / Texas / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 114, NWS Austin/San Antonio, TX

June 21, 2001Lee County, Williamson County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Jun 21, 2001, 10:55 PM CDT for Lee County, Williamson County, Texas. It was in force for 65 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued
Jun 21, 2001, 10:55 PM CDT (03:55 UTC)
Expired
Jun 22, 2001, 12:00 AM CDT
In force
65 min
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Lee County, TX, Williamson County, TX

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 3.9 hours before the alert went out and 270 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, Fort Worth, TX at 00:00Z on 2001-06-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1175 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, Fort Worth, TX at 00:00Z on 2001-06-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 38 square meters per square second.193958Sfc1 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
1175 J/kg
Mixed-layer CIN
-116 J/kg
Mixed-layer LCL
1188 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
38 m²/s²
0-3 km storm-relative helicity
106 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.1

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KEWX 220356
SVRSAT

TXC287-491-220500-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1055 PM CDT THU JUN 21 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR THE FOLLOWING COUNTIES IN TEXAS...
  WILLIAMSON
  LEE

* UNTIL MIDNIGHT CDT

* AT 1055 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 15 MILES WEST OF LEXINGTON...OR ABOUT 10 MILES
  SOUTH OF THORNDALE...MOVING SOUTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  OVER LEXINGTON AT 1125 PM
  5 MILES NORTHEAST OF FEDOR AT 1130 PM

THIS STORM WAS LIKLEY PRODUCING WINDS IN EXCESS OF 50 MPH ALONG WITH 
THE POSSIBILITY OF LARGE HAIL AND DANGEROUS LIGHTNING.  

LAT...LON 3049 9738 3037 9723 3023 9694 3041 9685
          3047 9715 3055 9731

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.

NWS Austin/San Antonio, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 21, 8:40 PM CDT, 2 hours 15 minutes earlier.

Area forecast discussion, Jun 21, 8:40 PM CDT, 2 hours 15 minutes before
SOUTH CENTRAL TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
840 PM CDT THU JUN 21 2001

WILL MAKE QUICK UPDATE TO ZONES TO ADD MENTION OF PSBLY SVR OVR THE
NE/ERN CWA WHERE CAPES ABOVE 2000 J/KG AND COULD SEE ISOLD DOWNBURST
WINDS AS THE CDFNTL BOUNDARY PUSHES SLOWLY SWD TWD THE NWD MOVG SEA
BREEZE.  REST OF FORECAST LOOKS GOOD AND NO CHANGES PLANNED ATTM.

.EWX...NONE.

1/19



In the hours before

Special weather statement, Jun 21, 10:50 PM CDT, 5 minutes before
TXZ172-173-190>194-208-209-220450-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1050 PM CDT THU JUN 21 2001

A LINE OF SHOWERS AND STRONG THUNDERSTORMS WAS PUSHING SLOWLY
SOUTHWARD ACROSS THE NORTHEAST SECTIONS OF SOUTH CENTRAL TEXAS AND
THE HILL COUNTRY. THE STRONGEST STORMS WERE LOCATED JUST EAST OF
TAYLOR MOVING SOUTHEAST AT NEAR 25 MPH TOWARD FEDOR AND DIME BOX.
THIS LINE OF SHOWERS AND THUNDERSTORMS EXTENDS WESTWARD TOWARD
AUSTIN AND FREDERICKSBURG...AND IS CAPABLE OF PRODUCING GUSTY
WINDS OF 35 TO 45 MPH...BRIEF HEAVY RAIN AND DANGEROUS LIGHTNING.

CURRENT INDICATIONS ARE THE STRONGEST STORMS WILL REMAIN EAST OF
I35 FROM AUSTIN TO SAN ANTONIO WHERE THE GREATEST MOISTURE AND
INSTABILITY EXISTS.  THIS LINE OF STORMS IS BEING MONITORED FOR
STRENGTHENING.

WHEN THUNDERSTORMS ARE OCCURRING...MOVE INDOORS.  DO NOT STAND BY
WINDOWS.  UNLESS IT IS AN EMERGENCY...AVOID USING TELEPHONES AND
ELECTRICAL APPLIANCES UNTIL THE STORM HAS PASSED.

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 22, 1:59 PM CDTSevere Thunderstorm WarningEWXReal46 min

Nearby

Severe Thunderstorm Warnings in Texas, 2001Every severe thunderstorm warning in 2001

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.