Alert archive / Texas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 129, NWS San Angelo, TX

June 20, 2011Shackelford County, Texas

NWS San Angelo, TX issued this severe thunderstorm warning at Jun 20, 2011, 11:44 PM CDT for Shackelford County, Texas. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 20, 2011, 11:44 PM CDT (04:44 UTC)
Expired: Jun 21, 2011, 12:15 AM CDT
In force: 31 min
Issued by: NWS San Angelo, TX
Area: Storm-based polygon

County Shackelford County, TX

The radar

The Dyess AFB radar (KDYX), 24 km from the middle of the area, began a volume at 04:44 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

Fort Worth, TX (KFWD), launched 00:00Z, 4.7 hours before the alert went out and 193 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: 1045 J/kg
Mixed-layer CIN: -288 J/kg
Mixed-layer LCL: 2415 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 157 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

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 San Angelo, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 20, 10:27 PM CDT, 1 hour 17 minutes earlier.

Area forecast discussion, Jun 20, 10:27 PM CDT, 1 hour 17 minutes before

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Hazardous weather outlook, Jun 20, 3:14 PM CDT, 8 hours 30 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN ANGELO TX
314 PM CDT MON JUN 20 2011

TXZ049-054-064>066-071>073-076>078-098-099-113-114-127-128-139-
140-154-155-168>170-212015-
FISHER-NOLAN-STERLING-COKE-RUNNELS-IRION-TOM GREEN-CONCHO-
CROCKETT-SCHLEICHER-SUTTON-HASKELL-THROCKMORTON-JONES-SHACKELFORD-
TAYLOR-CALLAHAN-COLEMAN-BROWN-MCCULLOCH-SAN SABA-MENARD-KIMBLE-
MASON-
314 PM CDT MON JUN 20 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WEST CENTRAL
TEXAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT

A RED FLAG WARNING FOR CRITICAL FIRE DANGER IS IN EFFECT FOR MUCH
OF WEST CENTRAL TEXAS UNTIL 10 PM THIS EVENING. STRONG SOUTH
WINDS...VERY DRY AIR AND HOT TEMPERATURES WILL BRING DANGEROUS
FIRE WEATHER CONDITIONS. AVOID OUTSIDE ACTIVITIES THAT MAY PRODUCE
SPARKS AND DISPOSE OF CIGARETTES CAREFULLY.

ISOLATED TO SCATTERED THUNDERSTORMS ARE POSSIBLE OVERNIGHT...MAINLY
ALONG AND NORTH OF A STERLING CITY TO BROWNWOOD LINE. THE MAIN
THREAT WILL BE DAMAGING WINDS. HAIL WILL ALSO BE POSSIBLE.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THERE IS A CHANCE OF THUNDERSTORMS ACROSS WEST CENTRAL TEXAS
TUESDAY AND WEDNESDAY. A FEW STORMS COULD BECOME SEVERE. THE MAIN
THREATS WILL BE DAMAGING WINDS AND LARGE HAIL.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING IN THE BIG COUNTRY.

In the hours before

Local storm report, Jun 20, 5:50 PM CDT, 5 hours 54 minutes before

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Local storm report, Jun 20, 6:21 PM CDT, 5 hours 23 minutes before

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Local storm report, Jun 20, 6:37 PM CDT, 5 hours 7 minutes before

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Special weather statement, Jun 20, 6:42 PM CDT, 5 hours 2 minutes before

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Special weather statement, Jun 20, 11:28 PM CDT, 16 minutes before

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The office that day

Everything else NWS San Angelo, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 20, 11:57 PM CDT	Severe Thunderstorm Warning	SJT	Callahan, Jones, Shackelford, Taylor	63 min
Jun 21, 12:50 AM CDT	Severe Thunderstorm Warning	SJT	Callahan, Taylor	40 min
Jun 21, 1:00 AM CDT	Severe Thunderstorm Warning	SJT	Callahan, Shackelford, Taylor	45 min
Jun 21, 1:31 AM CDT	Severe Thunderstorm Warning	SJT	Callahan, Coleman, Taylor	29 min
Jun 21, 2:14 AM CDT	Severe Thunderstorm Warning	SJT	Brown, Callahan, Coleman, Runnels	61 min
Jun 21, 2:47 AM CDT	Tornado Warning	SJT	Coleman	41 min
Jun 21, 4:49 PM CDT	Severe Thunderstorm Warning	SJT	Brown, Coleman	56 min
Jun 21, 5:06 PM CDT	Severe Thunderstorm Warning	SJT	Coke	39 min
Jun 21, 5:16 PM CDT	Severe Thunderstorm Warning	SJT	Callahan, Coleman	44 min
Jun 21, 5:46 PM CDT	Severe Thunderstorm Warning	SJT	Brown, Coleman	44 min
Jun 21, 6:10 PM CDT	Severe Thunderstorm Warning	SJT	Runnels	20 min
Jun 21, 6:25 PM CDT	Severe Thunderstorm Warning	SJT	Coke, Nolan	50 min
Jun 21, 6:29 PM CDT	Severe Thunderstorm Warning	SJT	Brown, Coleman	46 min
Jun 21, 6:33 PM CDT	Severe Thunderstorm Warning	SJT	Coleman	42 min
Jun 21, 6:37 PM CDT	Severe Thunderstorm Warning	SJT	Sterling	38 min
Jun 21, 6:59 PM CDT	Severe Thunderstorm Warning	SJT	Tom Green	46 min

Nearby

Severe Thunderstorm Warnings in Texas, 2011 Every 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.