Alert archive / Texas / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 78, NWS Austin/San Antonio, TX

May 20, 20014 counties in Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 20, 2001, 9:47 PM CDT for 4 counties in Texas. It was in force for 43 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: May 20, 2001, 9:47 PM CDT (02:47 UTC)
Expired: May 20, 2001, 10:30 PM CDT
In force: 43 min
Issued by: NWS Austin/San Antonio, TX
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Bastrop County, TX, Lee County, TX, Travis County, TX, Williamson County, TX

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 2.8 hours before the alert went out and 275 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1060 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 2345 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 134 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

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

353 
WUUS54 KEWX 210251
SVRSAT
TXC021-287-453-491-210330-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
947 PM CDT SUN MAY 20 2001

THE NATIONAL WEATHER SERVICE IN AUSTIN/SAN ANTONIO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR THE FOLLOWING COUNTIES IN          
  TEXAS...
  NORTHERN BASTROP
  EASTERN TRAVIS
  EASTERN WILLIAMSON
  LEE

* UNTIL 1030 PM CDT

* AT 947 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A     
  SEVERE THUNDERSTORM OVER PFLUGERVILLE MOVING TOWARD THE EAST AT 20 
  MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  IN THE ELGIN-COUPLAND AREA AT 10 PM
  PAIGE AT 1015 PM
  LEXINGTON AT 1030 PM
  LINCOLN-GIDDINGS AT 1045 PM

VERY LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU ARE
IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A
SUBSTANTIAL SHELTER.

INTENSE LIGHTNING IS OCCURRING WITH THIS STORM. IF OUTDOORS...STAY
AWAY FROM HIGH AREAS...METAL OBJECTS...AND TALL ISOLATED TREES. MOVE
INDOORS IF POSSIBLE BUT STAY AWAY FROM WINDOWS AND DOORS AND AVOID
USING THE TELEPHONE UNLESS IT IS AN EMERGENCY.


LAT...LON 3043 9771 3031 9756 3018 9695 3044 9694

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 May 20, 9:35 PM CDT, 12 minutes earlier.

Area forecast discussion, May 20, 9:35 PM CDT, 12 minutes before

SOUTH CENTRAL TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
935 PM CDT SUN MAY 20 2001

MAIN CONCERN THIS EVENING HAS BEEN SEVERE THUNDERSTORMS IN THE SOUTH
AND NORTH COUNTIES OF OUR CWA.  ACTIVITY ONGOING STILL IN TRAVIS AND
WILLIAMSON COUNTIES ATTM...WITH MORE CONVECTION HEADING TOWARD
SOUTHERN ATASCOSA AND KARNES COUNTIES IN THE SOUTH.

PREVIOUS ZONES COVER THE FORECAST SITUATION QUITE NICELY SO DON'T 0
PLAN ON ANY CHANGES.  SOME REVISIONS MAY BE NEEDED IF CONVECTION
EVENTUALLY ENDS BEFORE MIDNIGHT.

.EWX...NONE.

In the hours before

Local storm report, May 20, 8:25 PM CDT, 1 hour 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO, TX
825 PM CDT SUN MAY 20 2001

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0610 PM    DEWEES                    TX   1.75 INCH HAIL
05/20/01   WILSON                         REPORTED BY LAW
                                          ENFORCEMENT

0615 PM    5S FLORESVILLE            TX   WIND DAMAGE
05/20/01   WILSON                         HOUSE DESTROYED AND CAR
                                          WINDOWS DAMAGED REPORTED
                                          BY LAW ENFORCEMENT

0625 PM    STOCKDALE                 TX   4.00 INCH HAIL
05/20/01   WILSON                         REPORTED BY CO-OP
                                          OBSERVER

0715 PM    MCCOY                     TX   WIND DAMAGE
05/20/01   ATASCOSA                       ROOF TORN OFF HOUSE
                                          REPORTED BY LAW ENFORCEMENT

0745 PM    LULING                    TX   WIND DAMAGE
05/20/01   CALDWELL                       TREES AND POWER LINES DOWN
                                          REPORTED BY LAW ENFORCEMENT

815 PM     LLANO                     TX   WIND DAMAGE
0/20/01    LLANO                          TREES AND POWER LINES DOWN
                                          REPORTED BY LAW ENFORCEMENT

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 7:09 PM CDT	Severe Thunderstorm Warning	EWX	Llano	66 min
May 20, 7:10 PM CDT	Severe Thunderstorm Warning	EWX	Caldwell	65 min
May 20, 7:28 PM CDT	Severe Thunderstorm Warning	EWX	Karnes, Wilson	62 min
May 20, 7:51 PM CDT	Severe Thunderstorm Warning	EWX	Burnet	69 min
May 20, 8:29 PM CDT	Tornado Warning	EWX	Burnet	31 min
May 20, 8:45 PM CDT	Tornado Warning	EWX	Travis, Williamson	60 min
May 21, 6:39 AM CDT	Flash Flood Warning	EWX	Guadalupe	2 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2001 Every 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.