Alert archive / Texas / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 47, NWS Austin/San Antonio, TX

April 23, 2001Medina County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 23, 2001, 12:49 PM CDT for Medina County, Texas. It was in force for 41 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: Apr 23, 2001, 12:49 PM CDT (17:49 UTC)
Expired: Apr 23, 2001, 1:30 PM CDT
In force: 41 min
Issued by: NWS Austin/San Antonio, TX
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Medina County, TX

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 5.8 hours before the alert went out and 184 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2237 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: -67 m²/s²
0-3 km storm-relative helicity: 260 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KEWX 231750
SVRSAT
TXC325-231830-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1249 PM CDT MON APR 23 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR THE FOLLOWING COUNTIES IN TEXAS...
  MEDINA COUNTY

* UNTIL 130 PM CDT

* AT 1249 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 7 MILES SOUTHWEST OF CASTROVILLE...MOVING EAST
  AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  6 MILES NORTH OF NATALIA AT 1255 PM CDT
  4 MILES SOUTH OF CASTROVILLE AT 200 PM EDT

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.


LAT...LON 2928 9908 2915 9893 2914 9883 2952 9882

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 Apr 23, 11:02 AM CDT, 1 hour 47 minutes earlier.

Area forecast discussion, Apr 23, 11:02 AM CDT, 1 hour 47 minutes before

SOUTH CENTRAL TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1102 AM CDT MON APR 23 2001

SMALL CLUSTER OF VERY HEAVY RAINFALL CONTINUES IN THE SAN ANTONIO
AREA WITH A FEW REPORTS OF 3 TO 3.5 INCHES OF RAIN.  CLUSTER HAS
SHOWN SIGNS OF WEAKENING IN INTENSITY AS REDEVELOPMENT TAKES PLACE
JUST WEST.  THESE THE RESULT OF SHORT-WAVE AHEAD OF COLD FRONT.
MODELS INDICATE SHORT-WAVE WILL MOVE EAST BY EVENING.  SO...WILL
MAINTAIN HIGH POPS AND SEVERE/HEAVY RAINFALL MENTIONS...ESPECIALLY
SOUTH AND EAST FOR THIS AFTERNOON.  HOWEVER...FLASH FLOOD WATCH
CONTINUES TO BE NOT NEEDED AS WIDESPREAD FLOODING NOT EXPECTED.  WILL
MAKE SOME ADJUSTMENTS TO WINDS AND TEMPERATURES BASED ON ONGOING
TRENDS.  ANY CHANGES TO REMAINING PERIODS WILL WAIT UNTIL AFTERNOON
PACKAGE.  04/06.

.EWX...NONE.

In the hours before

Special weather statement, Apr 23, 7:06 AM CDT, 5 hours 43 minutes before

TXZ171>173-183>194-202>209-217>225-228-231400-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
706 AM CDT MON APR 23 2001

AT 706 AM...AN AREA OF SHOWERS AND THUNDERSTORMS WAS FROM
THE GEORGETOWN AND AUSTIN AREAS TO THE SAN ANTONIO AREA...
THEN WEST TO NEAR HONDO.  AN AREA OF SCATTERED SHOWERS AND
THUNDERSTORMS WAS ALSO INDICATED BETWEEN UVALDE AND EAGLE PASS.

AN UPPER LEVEL WEATHER SYSTEM AND ITS ASSOCIATED COOL FRONT MOVING
ACROSS CENTRAL AND SOUTH CENTRAL TEXAS WAS PRODUCING THESE
SHOWERS AND THUNDERSTORMS.  THIS PATTERN WILL BODE WELL FOR MOSTLY
CLOUDY SKIES...ALONG WITH A CHANCE OF RAIN...SHOWERS AND
THUNDERSTORMS THIS MORNING.  SOME OF THE THUNDERSTORMS MAY BECOME
SEVERE WITH LOCALLY HEAVY RAIN POSSIBLE AND OCCASIONAL LIGHTNING.

TO THE NORTH...A SURGE OF COOLER AIR IS EXPECTED TO MOVE THROUGH THE
AREA TODAY...KEEPING DAYTIME TEMPERATURES BELOW NORMAL.  COOLER
TEMPERATURES ARE EXPECTED TONIGHT.

ANOTHER WEATHER SYSTEM ALOFT WILL MOVE OVER THE AREA TONIGHT...AND
MAY CAUSE A CHANCE OF RAIN OR SHOWERS OVER THE EAST AND SOUTHEAT
PARTS OF SOUTH CENTRAL TEXAS.

ON TUESDAY SKIES ARE EXPECTED TO BECOME PARTL?Y CLOUDY AND THEN
MOSTLY SUNNY.  MOSTLY CLEAR SKIES ARE EXPECTED TUESDAY NIGHT.

ADDITIONAL STATEMENTS WILL BE ISSUED AS CONDITIONS WARRANT.

Local storm report, Apr 23, 10:03 AM CDT, 2 hours 46 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO, TX
1003 AM CDT MON APR 23 2001

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

0400 AM    13 N VANDERPOOL           TX   TORNADO
04/23/01   BANDERA                        TORNADO REPORTED BY CO-OP
                                          OBSERVERS

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 22, 11:15 PM CDT	Severe Thunderstorm Warning	EWX	Val Verde	60 min
Apr 23, 12:11 AM CDT	Severe Thunderstorm Warning	EWX	Val Verde	64 min
Apr 23, 12:21 AM CDT	Severe Thunderstorm Warning	EWX	Edwards	69 min
Apr 23, 12:54 AM CDT	Flash Flood Warning	EWX	Val Verde	3 hr
Apr 23, 1:18 AM CDT	Severe Thunderstorm Warning	EWX	Val Verde	42 min
Apr 23, 2:02 AM CDT	Flash Flood Warning	EWX	Edwards	118 min
Apr 23, 3:24 AM CDT	Severe Thunderstorm Warning	EWX	Bandera, Kerr	66 min
Apr 23, 7:50 AM CDT	Flash Flood Warning	EWX	Bexar, Comal	115 min
Apr 23, 9:20 AM CDT	Flash Flood Warning	EWX	Bexar, Comal	3 hr
Apr 23, 9:39 AM CDT	Flash Flood Warning	EWX	Guadalupe	3 hr
Apr 23, 12:07 PM CDT	Flash Flood Warning	EWX	Bexar, Medina	4 hr
Apr 23, 12:16 PM CDT	Severe Thunderstorm Warning	EWX	Bexar	59 min
Apr 23, 1:31 PM CDT	Severe Thunderstorm Warning	EWX	Gonzales, Guadalupe	59 min
Apr 23, 2:05 PM CDT	Severe Thunderstorm Warning	EWX	Bexar	55 min
Apr 23, 2:18 PM CDT	Severe Thunderstorm Warning	EWX	Wilson	57 min
Apr 23, 3:10 PM CDT	Flash Flood Warning	EWX	Bexar	5 hr
Apr 23, 4:10 PM CDT	Severe Thunderstorm Warning	EWX	Wilson	50 min

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.