Alert archive / Texas / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 45, NWS Austin/San Antonio, TX

April 23, 2001Bandera County, Kerr County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 23, 2001, 3:24 AM CDT for Bandera County, Kerr County, Texas. It was in force for 66 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, 3:24 AM CDT (08:24 UTC)
Expired: Apr 23, 2001, 4:30 AM CDT
In force: 66 min
Issued by: NWS Austin/San Antonio, TX
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Bandera County, TX, Kerr County, TX

The radar

The Laughlin AFB radar (KDFX), 114 km from the middle of the area, began a volume at 08:24 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.

Issued	Product	Office	Lasted
Apr 22, 11:45 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Del Rio, TX (KDRT), launched 00:00Z, 8.4 hours before the alert went out and 153 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: 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 230824
SVRSAT
TXC019-265-230930-

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

THE NATIONAL WEATHER SERVICE HAS ISSUED A

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

* UNTIL 430 AM CDT

* AT 324 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 13 MILES SOUTHWEST OF HUNT...OR ABOUT 13 MILES
  NORTHWEST OF MEDINA...MOVING EAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  7 MILES NORTH OF MEDINA AT 335 AM CDT
  2 MILES NORTH OF CAMP VERDE AT 350 AM CDT

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD PREPARE
FOR DAMAGING WINDS IN EXCESS OF 55 MPH...LARGE HAIL...AND DEADLY
LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY
INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.


LAT...LON 3005 9966 2979 9957 2980 9906 3009 9906

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, 6 hours 9 minutes earlier.

Area forecast discussion, Apr 22, 9:15 PM CDT, 6 hours 9 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.

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, 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, 12:49 PM CDT	Severe Thunderstorm Warning	EWX	Medina	41 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; radar from the NEXRAD Level II archive.