Alert archive / Texas / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 52, 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, 1:42 PM CDT for Val Verde County, Texas. It was in force for 63 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, 1:42 PM CDT (18:42 UTC)
Expired
May 4, 2001, 2:45 PM CDT
In force
63 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), 114 km from the middle of the area, began a volume at 18:45 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, 6.7 hours before the alert went out and 65 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°0°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.

773 
WUUS54 KEWX 041843
SVRSAT
TXC465-041945-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
142 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 245 PM CDT

* AT 142 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM FROM 32 MILES NORTH OF SEMINOLE CANYON STATE
  PARK TO 14 MILES WEST OF SEMINOLE CANYON STATE PARK...MOVING 
  SOUTHEAST AT 20 MPH.

* SEVERE THUNDERSTORMS WILL BE...
  OVER SEMINOLE CANYON STATE PARK AT 210 PM
  OVER COMSTOCK AT 240 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.

HEAVY RAINS MAY FLOOD LOW LYING AREAS SUCH AS LOW WATER CROSSINGS...
DITCHES AND UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED
ROADS AS THEY MAY BE WASHED OUT. WATER LEVELS OF SMALL STREAMS AND 
RIVERS MAY ALSO RISE. 

LAT...LON 3018 10139 2960 10164 2923 10115 2981 10091

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, 2 hours 42 minutes earlier.

Area forecast discussion, May 4, 11:00 AM CDT, 2 hours 42 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

The office that day

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

IssuedProductOfficeCountiesLasted
May 4, 1:45 PM CDTFlash Flood WarningEWXVal Verde2 hr
May 4, 2:43 PM CDTSevere Thunderstorm WarningEWXVal Verde62 min
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.