Alert archive / Texas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 42, NWS San Angelo, TX

April 21, 2011Fisher County, Texas

NWS San Angelo, TX issued this severe thunderstorm warning at Apr 21, 2011, 6:06 PM CDT for Fisher County, Texas. It was in force for 54 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: Apr 21, 2011, 6:06 PM CDT (23:06 UTC)
Expired: Apr 21, 2011, 7:00 PM CDT
In force: 54 min
Issued by: NWS San Angelo, TX
Area: Storm-based polygon

County Fisher County, TX

The radar

The Dyess AFB radar (KDYX), 110 km from the middle of the area, began a volume at 23:09 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

Midland Regional, TX (KMAF), launched 12:00Z, 11.1 hours before the alert went out and 191 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: 695 J/kg
Mixed-layer CIN: -359 J/kg
Mixed-layer LCL: 968 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 240 m²/s²
0-3 km storm-relative helicity: 283 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.4

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 Apr 21, 3:37 PM CDT, 2 hours 29 minutes earlier.

Area forecast discussion, Apr 21, 3:37 PM CDT, 2 hours 29 minutes before

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Hazardous weather outlook, Apr 21, 3:43 PM CDT, 2 hours 23 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE SAN ANGELO TX
343 PM CDT THU APR 21 2011

TXZ049-054-064>066-071>073-076>078-098-099-113-114-127-128-139-
140-154-155-168>170-222045-
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-
343 PM CDT THU APR 21 2011

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS MUCH OF WEST CENTRAL
TEXAS THIS AFTERNOON AND EVENING...AS A WARM FRONT MOVES NORTH
THROUGH THE BIG COUNTRY...BRINGING BRINGING IN MOIST AND UNSTABLE
AIR BEHIND IT. THE MAIN THREATS ARE LARGE HAIL AND DAMAGING WINDS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

ISOLATED TO SCATTERED THUNDERSTORMS ARE POSSIBLE FRIDAY INTO SUNDAY
NIGHT. WHILE WIDESPREAD SEVERE WEATHER IS NOT EXPECTED...SOME STORMS MAY
APPROACH SEVERE LEVELS...WITH THE PRIMARY THREATS BEING LARGE
HAIL...DAMAGING WINDS AND DEADLY LIGHTNING. THUNDERSTORMS WILL ALSO
INCREASE THE THREAT OF WILDFIRES IN AREAS WITH LITTLE RAINFALL.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

In the hours before

Local storm report, Apr 21, 1:46 PM CDT, 4 hours 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN ANGELO TX
146 PM CDT THU APR 21 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0144 PM     HAIL             5 SE MORAN              32.49N  99.11W
04/21/2011  E1.50 INCH       CALLAHAN           TX   PUBLIC

            COCORAHS REPORT INDICATED PING PONG SIZE HAIL

&&

EVENT NUMBER SJT1100100

CD

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 20, 7:14 PM CDT	Severe Thunderstorm Warning	SJT	Callahan, Shackelford	61 min
Apr 20, 8:00 PM CDT	Severe Thunderstorm Warning	SJT	Crockett, Irion	60 min
Apr 20, 8:23 PM CDT	Severe Thunderstorm Warning	SJT	Schleicher	67 min
Apr 20, 8:58 PM CDT	Severe Thunderstorm Warning	SJT	Crockett	62 min
Apr 20, 9:28 PM CDT	Severe Thunderstorm Warning	SJT	Schleicher, Sutton	47 min
Apr 20, 10:03 PM CDT	Severe Thunderstorm Warning	SJT	Crockett, Schleicher, Sutton	57 min
Apr 21, 6:57 PM CDT	Severe Thunderstorm Warning	SJT	Fisher	48 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.