Alert archive / Texas / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 74, NWS Austin/San Antonio, TX

May 10, 2012Val Verde County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 10, 2012, 5:21 AM CDT for Val Verde County, Texas. It was in force for 54 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 10, 2012, 5:21 AM CDT (10:21 UTC)
Expired: May 10, 2012, 6:15 AM CDT
In force: 54 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon

County Val Verde County, TX

The radar

The Laughlin AFB radar (KDFX), 110 km from the middle of the area, began a volume at 10:21 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.

What was reported inside it

Time	Report	Where	Remark
May 10, 6:05 AM CDT	TSTM WND GST 60	5 Nnw Comstock, TX
May 10, 6:05 AM CDT	HAIL 1	5 Nnw Comstock, TX
May 10, 6:20 AM CDT	HAIL 1	1 N Comstock, TX	LARGE HAIL COVERED THE GROUND

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Del Rio, TX (KDRT), launched 00:00Z, 10.4 hours before the alert went out and 59 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: 474 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 1152 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -47 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.5

Open this sounding in Storm Lab

The text

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

598 
WUUS54 KEWX 101021
SVREWX
TXC465-101115-
/O.NEW.KEWX.SV.W.0074.120510T1021Z-120510T1115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
521 AM CDT THU MAY 10 2012

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  VAL VERDE COUNTY...

* UNTIL 615 AM CDT.

* AT 516 AM 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 8 MILES
  SOUTHWEST OF SEMINOLE CANYON STATE PARK...OR 15 MILES SOUTHWEST OF
  COMSTOCK...AND MOVING NORTHEAST AT 30 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE SHUMLA.

LAT...LON 3004 10129 2986 10097 2958 10125 2959 10126
      2957 10130 2959 10133 2964 10131 2965 10133
      2964 10136 2973 10141 2974 10145
TIME...MOT...LOC 1021Z 216DEG 24KT 2962 10138

$$

1 follow-up statement

654 
WWUS54 KEWX 101049
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
549 AM CDT THU MAY 10 2012

TXC465-101115-
/O.CON.KEWX.SV.W.0074.000000T0000Z-120510T1115Z/
VAL VERDE TX-
549 AM CDT THU MAY 10 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 AM CDT
FOR VAL VERDE COUNTY...

AT 545 AM CDT...NWS METEOROLOGISTS CONTINUED TO DETECT A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND DAMAGING
WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR SEMINOLE
CANYON STATE PARK...OR 7 MILES WEST OF COMSTOCK...MOVING NORTHEAST AT
30 MPH.

SOME LOCATIONS IN THE WARNING AREA INCLUDE BAKERS CROSSING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 100 PM CDT
THURSDAY AFTERNOON FOR SOUTH CENTRAL TEXAS.

&&

LAT...LON 3004 10129 2986 10097 2958 10125 2959 10126
      2957 10130 2959 10133 2964 10131 2965 10133
      2964 10136 2973 10141 2974 10145
TIME...MOT...LOC 1050Z 215DEG 27KT 2974 10125

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 10, 6:12 AM CDT	Severe Thunderstorm Warning	EWX	Val Verde	63 min
May 10, 7:19 AM CDT	Severe Thunderstorm Warning	EWX	Edwards, Val Verde	44 min
May 10, 9:29 AM CDT	Severe Thunderstorm Warning	EWX	Dimmit, Frio, Zavala	61 min
May 10, 10:30 AM CDT	Severe Thunderstorm Warning	EWX	Frio	60 min
May 10, 10:33 AM CDT	Areal Flood Advisory	EWX	Frio	117 min
May 10, 11:17 AM CDT	Severe Thunderstorm Warning	EWX	Atascosa, Frio	58 min
May 10, 11:32 AM CDT	Severe Thunderstorm Warning	EWX	Atascosa, Wilson	58 min
May 10, 12:02 PM CDT	Flash Flood Warning	EWX	Val Verde	3 hr
May 10, 12:14 PM CDT	Severe Thunderstorm Warning	EWX	Atascosa, Frio	31 min
May 10, 12:20 PM CDT	Areal Flood Advisory	EWX	Atascosa, Frio	2 hr
May 10, 12:40 PM CDT	Areal Flood Advisory	EWX	Bandera, Edwards, Kerr, Kinney, Real, Uvalde	110 min
May 10, 1:04 PM CDT	Severe Thunderstorm Warning	EWX	Karnes, Wilson	56 min
May 10, 1:15 PM CDT	Tornado Warning	EWX	Gonzales, Karnes, Wilson	45 min
May 10, 1:42 PM CDT	Tornado Warning	EWX	Atascosa	33 min
May 10, 1:57 PM CDT	Tornado Warning	EWX	DeWitt, Gonzales, Karnes, Wilson	33 min
May 10, 2:19 PM CDT	Flash Flood Warning	EWX	Atascosa, DeWitt, Gonzales, Karnes, Wilson	3 hr
May 10, 2:24 PM CDT	Severe Thunderstorm Warning	EWX	Karnes	51 min
May 10, 2:42 PM CDT	Tornado Warning	EWX	Karnes	48 min
May 10, 2:49 PM CDT	Flash Flood Warning	EWX	Bandera, Edwards, Kerr, Real, Uvalde	3 hr
May 10, 3:05 PM CDT	Tornado Warning	EWX	Wilson	40 min
May 10, 3:31 PM CDT	Tornado Warning	EWX	Karnes	29 min
May 10, 3:40 PM CDT	River Flood Warning	EWX	Val Verde	31 hr
May 10, 3:45 PM CDT	Areal Flood Advisory	EWX	DeWitt, Fayette, Gonzales, Lavaca	105 min
May 10, 3:57 PM CDT	Tornado Warning	EWX	DeWitt, Karnes, Wilson	33 min
May 10, 4:39 PM CDT	Flash Flood Warning	EWX	Bandera, Gillespie, Kerr	81 min
May 10, 4:52 PM CDT	Severe Thunderstorm Warning	EWX	DeWitt, Gonzales, Karnes	29 min
May 10, 5:58 PM CDT	Flash Flood Warning	EWX	Bandera, Blanco, Burnet, Edwards, Gillespie, Kendall and 4 more	3 hr
May 10, 5:58 PM CDT	Severe Thunderstorm Warning	EWX	Dimmit, Maverick, Uvalde, Zavala	47 min
May 10, 6:11 PM CDT	Areal Flood Advisory	EWX	DeWitt, Fayette, Karnes, Lavaca	109 min
May 10, 6:41 PM CDT	Severe Thunderstorm Warning	EWX	Dimmit, Frio, Zavala	49 min

Nearby

Severe Thunderstorm Warnings in Texas, 2012 Every severe thunderstorm warning in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.