Alert archive / Texas / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 21, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 21, 2011, 7:54 PM CDT for Val Verde County, Texas. It was in force for 36 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Apr 21, 2011, 7:54 PM CDT (00:54 UTC)
- Expired
- Apr 21, 2011, 8:30 PM CDT
- In force
- 36 min
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Storm-based polygon
County Val Verde County, TX
The radar
The Laughlin AFB radar (KDFX), 156 km from the middle of the area, began a volume at 00:58 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 21, 3:03 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Del Rio, TX (KDRT), launched 00:00Z, 0.9 hours before the alert went out and 109 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.
- Mixed-layer CAPE
- 2280 J/kg
- Mixed-layer CIN
- -76 J/kg
- Mixed-layer LCL
- 2009 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 36 m²/s²
- 0-3 km storm-relative helicity
- 155 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
844
WUUS54 KEWX 220054
SVREWX
TXC465-220130-
/O.NEW.KEWX.SV.W.0021.110422T0054Z-110422T0130Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
754 PM CDT THU APR 21 2011
THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
VAL VERDE COUNTY...
* UNTIL 830 PM CDT.
* AT 754 PM CDT...NWS METEOROLOGISTS HAVE DETECTED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING
WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 21 MILES WEST OF
PANDALE...OR 27 MILES NORTHWEST OF LANGTRY...AND MOVING EAST
AT 30 MPH. THIS STORM PRODUCED A WIND GUST OF 58 MPH IN DRYDEN.
* SOME LOCATIONS IN THE WARNING INCLUDE HACKBERRY CROSSING AND
PANDALE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT
THURSDAY EVENING FOR SOUTH CENTRAL TEXAS.
&&
LAT...LON 3027 10177 3028 10175 3029 10132 3002 10129
3001 10131 2998 10130 2998 10176 3000 10177
TIME...MOT...LOC 0051Z 268DEG 26KT 3010 10187
$$1 follow-up statement
384
WWUS54 KEWX 220112
SVSEWX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
812 PM CDT THU APR 21 2011
TXC465-220130-
/O.CON.KEWX.SV.W.0021.000000T0000Z-110422T0130Z/
VAL VERDE TX-
812 PM CDT THU APR 21 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM CDT
FOR VAL VERDE COUNTY...
AT 812 PM CDT...NWS METEOROLOGISTS CONTINUED TO DETECT A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING
WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 9 MILES SOUTHWEST
OF HACKBERRY CROSSING...OR 22 MILES NORTHWEST OF LANGTRY...MOVING
EAST AT 30 MPH. THIS STORM HAS HAD A HISTORY OF PRODUCING WIND GUSTS
UP TO 60 MPH AND NICKEL SIZE HAIL.
SOME LOCATIONS IN THE WARNING AREA INCLUDE PANDALE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT
THURSDAY EVENING FOR SOUTH CENTRAL TEXAS.
&&
LAT...LON 3027 10177 3028 10175 3029 10132 3002 10129
3001 10131 2998 10130 2998 10176 3000 10177
TIME...MOT...LOC 0108Z 268DEG 26KT 3010 10173
$$The office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 10:46 PM CDT | Severe Thunderstorm Warning | EWX | Val Verde | 59 min |
| Apr 21, 11:42 PM CDT | Severe Thunderstorm Warning | EWX | Val Verde | 37 min |
| Apr 21, 11:50 PM CDT | Tornado Warning | EWX | Val Verde | 26 min |
Nearby
Severe Thunderstorm Warnings in Texas, 2011Every severe thunderstorm warning in 2011
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.