Alert archive / Texas / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 43, NWS Austin/San Antonio, TX

April 23, 2001Edwards County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 23, 2001, 12:21 AM CDT for Edwards County, Texas. It was in force for 69 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, 12:21 AM CDT (05:21 UTC)
Expired
Apr 23, 2001, 1:30 AM CDT
In force
69 min
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Edwards County, TX

The radar

The Laughlin AFB radar (KDFX), 92 km from the middle of the area, began a volume at 05:22 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 22, 11:45 PM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Del Rio, TX (KDRT), launched 00:00Z, 5.4 hours before the alert went out and 88 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.

034 
WUUS54 KEWX 230521
SVRSAT
TXC137-230630-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1221 AM CDT MON APR 23 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

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

* UNTIL 130 AM CDT

* AT 1221 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 32 MILES WEST OF ROCKSPRINGS...OR ABOUT 7 MILES
  NORTH OF LOMA ALTA...MOVING EAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  NEAR ROCKSPRINGS AT 120 AM CDT

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING. PREPARE TO MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE
SUCH AS A BASEMENT OR SMALL INTERIOR ROOM IF A TORNADO IS SPOTTED.


LAT...LON 3021 10067 2985 10068 2991 10010 3026 10019

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 22, 9:15 PM CDT, 3 hours 6 minutes earlier.

Area forecast discussion, Apr 22, 9:15 PM CDT, 3 hours 6 minutes before
SOUTH CENTRAL TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
915 PM CDT SUN APR 22 2001

CONVECTION TO THE WEST AND NORTHWEST HAVING A DIFFICULT TIME
ENTERING THE CWA THIS EVENING.  THE CDFNT/DRY LINE BECOMES AN
INVERTED TROF NW OF THE CWA AND HENCE THE SLOW SEWD MOVEMENT.
THE CLUSTER OF STORMS JUST SW OF DRT HAVE RIGHT MOVEMENT BUT HAVE
WEAKENED SINCE COMING OFF THE MOUNTAINS...BUT CONT TO REDEVELOP.
CAP REMAINS FAIRLY STG ACROSS THE CWA THIS EVENING WITH A GOOD SLY
30-40 KT LLJ CONTG TO FEED THE STORMS.  NOT PLANNING ON MAKING ANY
CHANGES TO ZONES ATTM AS EXPECTED CONVECTION TO GET MORE ORGANIZED
AS FNTL BOUNDARY SLOWLY NEARS/AND BECOMES MORE E-W HWHILE CONVECTION
TAPS INTO BETTER MOISTURE FROM THE LLJ TOWARDS THE EAST.  MAIN SVR
THREAT WILL BE LARGE HAIL AND DAMAGING WINDS.

.EWX...NONE.

01/16

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 22, 11:15 PM CDTSevere Thunderstorm WarningEWXVal Verde60 min
Apr 23, 12:11 AM CDTSevere Thunderstorm WarningEWXVal Verde64 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.