Alert archive / Texas / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 53, NWS Austin/San Antonio, TX

May 4, 2001Val Verde County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 4, 2001, 2:43 PM CDT for Val Verde County, Texas. It was in force for 62 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 4, 2001, 2:43 PM CDT (19:43 UTC)
Expired
May 4, 2001, 3:45 PM CDT
In force
62 min
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Val Verde County, TX

The radar

The Laughlin AFB radar (KDFX), 108 km from the middle of the area, began a volume at 19:44 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 7.7 hours before the alert went out and 70 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, Del Rio, TX at 12:00Z on 2001-05-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 947 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Del Rio, TX at 12:00Z on 2001-05-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 232 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
947 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
590 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
232 m²/s²
0-3 km storm-relative helicity
318 m²/s²
Significant tornado parameter
1.3
Supercell composite
11.5

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KEWX 041943
SVRSAT
TXC465-042045-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
243 PM CDT FRI MAY 4 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR THE FOLLOWING COUNTIES IN TEXAS...
  VAL VERDE

* UNTIL 345 PM CDT

* AT 240 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 25 MILES WEST OF LOMA ALTA...OR ABOUT 10 MILES
  NORTH OF COMSTOCK...MOVING NORTHEAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL CROSS HIGHWAY 163 ABOUT 10 MILES 
NORTH OF COMSTOCK IN THE NEXT 5 MINUTES.  

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 2986 10131 2969 10127 2991 10074 3024 10073 3025 10097

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 4, 11:00 AM CDT, 3 hours 43 minutes earlier.

Area forecast discussion, May 4, 11:00 AM CDT, 3 hours 43 minutes before
SOUTH CENTRAL TEXAS FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
11 AM CDT FRI MAY 4 2001

NO BOUNDARIES INDICATED ON SURFACE ANALYSES FOR SOUTH CENTRAL TEXAS,
BUT MSAS MOISTURE CONVERGENCE CONTINUES TO FOCUS OVER THE WATCH AREA
WHILE RADARS ARE INDICATED MORE ORGANIZED CONVECTION FLARING UP OUT
WEST FROM FORT STOCKTON TO BIG SPRINGS. EXPECT CONTINUED LIGHT
SHOWERS AND ISOLATED THUNDERSTORMS IN THE FIRST PERIOD MAINLY WEST
OF THE I-35 CORRIDOR. AM RELUCTANT TO TAMPER WITH AFTERNOON RAIN
CHANCES OVER EASTERN SECTIONS WHERE LITTLE OR NO RAINFALL OCCURRING
SINCE CONVECTIVE TEMPERATURES IN THE LOW TO MID 80S WILL LIKELY BE
REACHED. THUS ONLY REASON TO UPDATE IS TO REFLECT THE EFFECTS OF
CLOUD COVER TRENDS ON TEMPERATURES.

.EWX...FLASH FLOOD WATCH THROUGH TONIGHT FOR THE TEXAS HILL COUNTRY
       AND WESTERN SOUTH CENTRAL TEXAS.

18

In the hours before

Special weather statement, May 4, 1:45 PM CDT, 58 minutes before
TXZ171-172-183>190-202>204-050200-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
145 PM CDT FRI MAY 4 2001

...SEVERE THUNDERSTORMS POSSIBLE IN THE HILL COUNTRY THIS AFTERNOON
AND TONIGHT...

A DEVELOPING LINE OF THUNDERSTORMS IS MOVING ACROSS VAL VERDE
COUNTY.  THIS LINE IS EXPECTED TO CONTINUE MOVING TOWARD THE EAST AT
20 MPH THIS AFTERNOON AND INCREASE IN AREAL COVERAGE AND INTENSITY.
SOME OF THE STORMS COULD APPROACH SEVERE LIMITS...WHICH MEANS THAT
LARGE HAIL...GUSTY DAMAGING WINDS...FREQUENT DEADLY LIGHTNING AND
LOCALLY HEAVY RAINFALL WHICH COULD PRODUCE FLASH FLOODING MAY OCCUR.

THE AREA WITH THE GREATEST RISK OF SEVERE THUNDERSTORMS IS THAT
PORTION OF THE TEXAS HILL COUNTRY WEST OF INTERSTATE 35 BETWEEN SAN
ANTONIO AND GEORGETOWN...AND ALONG AND NORTH OF U.S. HIGHWAY 90
BETWEEN SAN ANTONIO AND DEL RIO.

THIS OUTLOOK APPLIES TO THE FOLLOWING SPECIFIC COUNTIES...

GILLESPIE...MEDINA...KENDALL...REAL...BLANCO...KERR...BURNET...
BANDERA...LLANO...EDWARDS...KINNEY...UVALDE AND VAL VERDE.

ABUNDANT LOW-LEVEL MOISTURE OVER SOUTH TEXAS...COMBINED WITH AN
APPROACHING UPPER-LEVEL DISTURBANCE FROM MEXICO...WILL PRODUCE
WIDESPREAD SHOWER AND THUNDERSTORM ACTIVITY THIS AFTERNOON AND
TONIGHT.  SOME OF THE STORMS COULD BE SEVERE.  IN ADDITION...A FLASH
FLOOD WATCH IS IN EFFECT FOR MUCH OF THE HILL COUNTRY AND ADJACENT
SECTIONS OF THE EDWARDS PLATEAU THROUGH TONIGHT.

SPOTTER NETWORKS MAY NEED TO BE ACTIVATED AS THE THUNDERSTORMS
MOVE INTO THE THREATENED AREA.

FOR INFORMATION ON WEATHER THREATS IN SURROUNDING AREAS...REFER
TO OUTLOOKS FROM OFFICES IN MIDLAND...SAN ANGELO...FORT WORTH...
HOUSTON/GALVESTON AND CORPUS CHRISTI.

The office that day

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

IssuedProductOfficeCountiesLasted
May 4, 1:42 PM CDTSevere Thunderstorm WarningEWXVal Verde63 min
May 4, 1:45 PM CDTFlash Flood WarningEWXVal Verde2 hr
May 4, 3:45 PM CDTSevere Thunderstorm WarningEWXVal Verde60 min
May 4, 3:56 PM CDTTornado WarningEWXVal Verde34 min
May 4, 4:00 PM CDTFlash Flood WarningEWXVal Verde2 hr
May 4, 5:30 PM CDTFlash Flood WarningEWXEdwards3 hr
May 4, 5:55 PM CDTFlash Flood WarningEWXVal Verde2 hr
May 4, 5:58 PM CDTSevere Thunderstorm WarningEWXKinney, Val Verde62 min
May 4, 6:41 PM CDTTornado WarningEWXKinney64 min
May 4, 6:42 PM CDTFlash Flood WarningEWXKinney2 hr

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; radar from the NEXRAD Level II archive.