Alert archive / Texas / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 71, NWS Austin/San Antonio, TX

May 20, 2001Atascosa County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 20, 2001, 5:07 PM CDT for Atascosa County, Texas. It was in force for 53 min. 2 reports 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
May 20, 2001, 5:07 PM CDT (22:07 UTC)
Expired
May 20, 2001, 6:00 PM CDT
In force
53 min
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

County Atascosa County, TX

What was reported inside it

TimeReportWhereRemark
May 20, 5:15 PM CDTThunderstorm WindCampbellton, TXSevere thunderstorm winds blew the roof off several houses and blew down numerous trees.
May 20, 5:45 PM CDTHail 1.75Campbellton, TX

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 nearest sounding before it

Corpus Christi, TX (KCRP), launched 12:00Z, 10.1 hours before the alert went out and 174 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 12:00Z on 2001-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 195 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 12:00Z on 2001-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 108 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
195 J/kg
Mixed-layer CIN
-489 J/kg
Mixed-layer LCL
1288 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
108 m²/s²
0-3 km storm-relative helicity
168 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KEWX 202210
SVRSAT
TXC013-202300-

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

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR THE FOLLOWING COUNTIES IN TEXAS...
  ATASCOSA

* UNTIL 600 PM CDT

* AT 507 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A   
SEVERE THUNDERSTORM 15 MILES SOUTHWEST OF CAMPBELLTON...MOVING 
NORTHEAST AT 20 MPH.  THE STORM SHOULD EFFECT CAMPBELLTON AROUND 530 
PM.

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.


LAT.|..LON 2866 9858 2866 9831 2881 9816 2902 9837

The office that day

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

IssuedProductOfficeCountiesLasted
May 20, 5:44 PM CDTSevere Thunderstorm WarningEWXKarnes, Wilson61 min
May 20, 6:05 PM CDTTornado WarningEWXWilson25 min
May 20, 6:44 PM CDTSevere Thunderstorm WarningEWXGonzales, Guadalupe61 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.