Alert archive / Texas / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 138, NWS San Angelo, TX

May 7, 2015Callahan County, Shackelford County, Texas

NWS San Angelo, TX issued this severe thunderstorm warning at May 7, 2015, 7:42 PM CDT for Callahan County, Shackelford County, Texas. It was in force for 48 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: May 7, 2015, 7:42 PM CDT (00:42 UTC)
Expired: May 7, 2015, 8:30 PM CDT
In force: 48 min
Issued by: NWS San Angelo, TX
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Callahan County, TX, Shackelford County, TX

The radar

The Dyess AFB radar (KDYX), 11 km from the middle of the area, began a volume at 00:44 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, 0.7 hours before the alert went out and 197 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: 1673 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 942 m above ground
0-6 km bulk shear: 75 kt
0-1 km storm-relative helicity: 249 m²/s²
0-3 km storm-relative helicity: 380 m²/s²
Significant tornado parameter: 4.1
Supercell composite: 18.6

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 May 7, 6:34 PM CDT, 1 hour 8 minutes earlier.

Area forecast discussion, May 7, 6:34 PM CDT, 1 hour 8 minutes before

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Hazardous weather outlook, May 7, 3:36 PM CDT, 4 hours 6 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN ANGELO TX
336 PM CDT THU MAY 7 2015

TXZ049-054-064>066-071>073-076>078-098-099-113-114-127-128-139-
140-154-155-168>170-082045-
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-
336 PM CDT THU MAY 7 2015

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

ISOLATED TO SCATTERED SEVERE THUNDERSTORMS WILL BE POSSIBLE THIS
AFTERNOON AND EVENING ACROSS WEST CENTRAL TEXAS. THE GREATEST
THREAT FOR SEVERE STORMS WILL EXIST NORTH OF A STERLING CITY
TO SAN ANGELO TO BRADY LINE. SEVERE WEATHER THREATS INCLUDE HAIL
LARGER THAN GOLF BALLS...DAMAGING WINDS AND ISOLATED TORNADOES.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

ORGANIZED SEVERE WEATHER IS POSSIBLE FRIDAY AND AGAIN ON SATURDAY.
SEVERE WEATHER THREATS INCLUDE DAMAGING WINDS...VERY LARGE
HAIL...TORNADOES AND LOCALIZED FLOODING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED LATE THIS AFTERNOON
AND EVENING. SPOTTER ACTIVATION IS LIKELY FRIDAY AND SATURDAY.

24

In the hours before

Local storm report, May 7, 6:55 PM CDT, 47 minutes before

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Local storm report, May 7, 6:56 PM CDT, 46 minutes before

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Local storm report, May 7, 7:03 PM CDT, 39 minutes before

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Special weather statement, May 7, 7:15 PM CDT, 27 minutes before

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Local storm report, May 7, 7:31 PM CDT, 11 minutes before

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Special weather statement, May 7, 7:32 PM CDT, 10 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
May 7, 7:15 PM CDT	Special Weather Statement	SJT	Callahan	30 min
May 7, 7:32 PM CDT	Special Weather Statement	SJT	Callahan, Shackelford	28 min
May 7, 8:18 PM CDT	Severe Thunderstorm Warning	SJT	Callahan, Coleman	42 min
May 7, 8:48 PM CDT	Severe Thunderstorm Warning	SJT	Brown, Callahan, Coleman	57 min
May 7, 9:37 PM CDT	Severe Thunderstorm Warning	SJT	Brown	53 min
May 7, 10:30 PM CDT	Special Weather Statement	SJT	Coleman	30 min
May 7, 10:34 PM CDT	Areal Flood Advisory	SJT	Brown	116 min
May 7, 10:37 PM CDT	Severe Thunderstorm Warning	SJT	Brown, Coleman	38 min
May 7, 11:11 PM CDT	Severe Thunderstorm Warning	SJT	Brown, Coleman	64 min
May 7, 11:30 PM CDT	Flash Flood Warning	SJT	Brown, Coleman	3 hr
May 8, 12:11 AM CDT	Severe Thunderstorm Warning	SJT	Brown	44 min
May 8, 12:40 AM CDT	Areal Flood Advisory	SJT	Brown	95 min
May 8, 3:09 PM CDT	Special Weather Statement	SJT	Upton	36 min
May 8, 5:08 PM CDT	Tornado Warning	SJT	Haskell	52 min
May 8, 5:55 PM CDT	Tornado Warning Tornado observed	SJT	Haskell, Throckmorton	50 min
May 8, 6:19 PM CDT	Tornado Warning	SJT	Haskell, Throckmorton	41 min
May 8, 6:29 PM CDT	Areal Flood Advisory	SJT	Haskell, Throckmorton	2 hr
May 8, 6:53 PM CDT	Tornado Warning Tornado observed	SJT	Throckmorton	52 min

Nearby

Severe Thunderstorm Warnings in Texas, 2015 Every severe thunderstorm warning in 2015

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.