Alert archive / Texas / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 41, NWS Austin/San Antonio, TX

April 22, 2001Val Verde County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 22, 2001, 11:15 PM CDT for Val Verde County, Texas. It was in force for 60 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 22, 2001, 11:15 PM CDT (04:15 UTC)
Expired
Apr 23, 2001, 12:15 AM CDT
In force
60 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), 131 km from the middle of the area, began a volume at 04:19 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 00:00Z, 4.3 hours before the alert went out and 94 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 00:00Z on 2001-04-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1796 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, Del Rio, TX at 00:00Z on 2001-04-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 6 square meters per square second.193958Sfc1 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
1796 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
2172 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
6 m²/s²
0-3 km storm-relative helicity
66 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.7

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KEWX 230417
SVRSAT
TXC465-230515-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1115 PM CDT SUN APR 22 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

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

* UNTIL 1215 AM CDT

* AT 1115 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 14 MILES WEST OF JUNO...MOVING EAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  4 MILES NORTH OF JUNO AT 1130 PM CDT

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. SEEK HIGHER GROUND IF THREATENED BY FLOOD
WATERS.

LAT...LON 3026 10144 3005 10141 3002 10071 3027 10075

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 23, 12:11 AM CDTSevere Thunderstorm WarningEWXVal Verde64 min
Apr 23, 12:21 AM CDTSevere Thunderstorm WarningEWXEdwards69 min
Apr 23, 12:54 AM CDTFlash Flood WarningEWXVal Verde3 hr
Apr 23, 1:18 AM CDTSevere Thunderstorm WarningEWXVal Verde42 min
Apr 23, 2:02 AM CDTFlash Flood WarningEWXEdwards118 min
Apr 23, 3:24 AM CDTSevere Thunderstorm WarningEWXBandera, Kerr66 min
Apr 23, 7:50 AM CDTFlash Flood WarningEWXBexar, Comal115 min
Apr 23, 9:20 AM CDTFlash Flood WarningEWXBexar, Comal3 hr
Apr 23, 9:39 AM CDTFlash Flood WarningEWXGuadalupe3 hr
Apr 23, 12:07 PM CDTFlash Flood WarningEWXBexar, Medina4 hr
Apr 23, 12:16 PM CDTSevere Thunderstorm WarningEWXBexar59 min
Apr 23, 12:49 PM CDTSevere Thunderstorm WarningEWXMedina41 min
Apr 23, 1:31 PM CDTSevere Thunderstorm WarningEWXGonzales, Guadalupe59 min
Apr 23, 2:05 PM CDTSevere Thunderstorm WarningEWXBexar55 min
Apr 23, 2:18 PM CDTSevere Thunderstorm WarningEWXWilson57 min
Apr 23, 3:10 PM CDTFlash Flood WarningEWXBexar5 hr
Apr 23, 4:10 PM CDTSevere Thunderstorm WarningEWXWilson50 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.