Alert archive / Texas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 473, NWS Fort Worth, TX

July 2, 2011Collin County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Jul 2, 2011, 6:18 PM CDT for Collin 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: Jul 2, 2011, 6:18 PM CDT (23:18 UTC)
Expired: Jul 2, 2011, 6:49 PM CDT
In force: 31 min
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon

County Collin County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 97 km from the middle of the area, began a volume at 23:17 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 12:00Z, 11.3 hours before the alert went out and 78 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: 897 J/kg
Mixed-layer CIN: -101 J/kg
Mixed-layer LCL: 1666 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -47 m²/s²
0-3 km storm-relative helicity: -39 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Fort Worth, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 2, 5:53 PM CDT, 25 minutes earlier.

Area forecast discussion, Jul 2, 5:53 PM CDT, 25 minutes before

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Hazardous weather outlook, Jul 2, 3:37 PM CDT, 2 hours 41 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE FORT WORTH TX
337 PM CDT SAT JUL 2 2011

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-031200-
MONTAGUE-COOKE-GRAYSON-FANNIN-LAMAR-YOUNG-JACK-WISE-DENTON-COLLIN-
HUNT-DELTA-HOPKINS-STEPHENS-PALO PINTO-PARKER-TARRANT-DALLAS-
ROCKWALL-KAUFMAN-VAN ZANDT-RAINS-EASTLAND-ERATH-HOOD-SOMERVELL-
JOHNSON-ELLIS-HENDERSON-COMANCHE-MILLS-HAMILTON-BOSQUE-HILL-NAVARRO-
FREESTONE-ANDERSON-LAMPASAS-CORYELL-BELL-MCLENNAN-FALLS-LIMESTONE-
LEON-MILAM-ROBERTSON-
337 PM CDT SAT JUL 2 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH TEXAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT.
ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED EAST OF THE I-35
CORRIDOR THIS AFTERNOON THROUGH MID EVENING. ANY STORM THAT
DEVELOPS WILL BE CAPABLE OF PRODUCING FREQUENT CLOUD TO GROUND
LIGHTNING AND GUSTY OUTFLOW WINDS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.
A SLIGHT CHANCE OF THUNDERSTORMS WILL CONTINUE THROUGHOUT THE
HOLIDAY WEEKEND....MAINLY EAST OF I-35.

.SPOTTER INFORMATION STATEMENT...
LIMITED SPOTTER ACTIVATION MAY BE REQUESTED THIS AFTERNOON AND
EVENING IN AREAS EAST OF I-35.

In the hours before

Local storm report, Jul 2, 4:54 PM CDT, 1 hour 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
454 PM CDT SAT JUL 02 2011

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

0439 PM     TSTM WND DMG     2 W TENNESSEE COLONY    31.83N  95.88W
07/02/2011                   ANDERSON           TX   TRAINED SPOTTER

            ROOF BLOWN OFF A MOBILE HOME WEST OF TENNESSEE COLONY

Special weather statement, Jul 2, 5:39 PM CDT, 39 minutes before

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Local storm report, Jul 2, 5:44 PM CDT, 34 minutes before

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Special weather statement, Jul 2, 6:01 PM CDT, 17 minutes before

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Special weather statement, Jul 2, 6:08 PM CDT, 10 minutes before

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Special weather statement, Jul 2, 6:15 PM CDT, 3 minutes before

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The office that day

Everything else NWS Fort Worth, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 1, 7:56 PM CDT	Special Weather Statement	FWD	Van Zandt	34 min
Jul 2, 2:50 PM CDT	Special Weather Statement	FWD	Van Zandt	25 min
Jul 2, 3:18 PM CDT	Special Weather Statement	FWD	Van Zandt	57 min
Jul 2, 3:30 PM CDT	Severe Thunderstorm Warning	FWD	Van Zandt	45 min
Jul 2, 3:45 PM CDT	Special Weather Statement	FWD	Anderson	30 min
Jul 2, 3:56 PM CDT	Severe Thunderstorm Warning	FWD	Anderson	34 min
Jul 2, 4:30 PM CDT	Severe Thunderstorm Warning	FWD	Anderson	45 min
Jul 2, 4:52 PM CDT	Special Weather Statement	FWD	Freestone	38 min
Jul 2, 4:55 PM CDT	Severe Thunderstorm Warning	FWD	Freestone	35 min
Jul 2, 5:39 PM CDT	Special Weather Statement	FWD	Freestone	36 min
Jul 2, 6:01 PM CDT	Special Weather Statement	FWD	Collin	29 min
Jul 2, 6:08 PM CDT	Special Weather Statement	FWD	Jack, Palo Pinto, Stephens, Young	52 min
Jul 2, 6:15 PM CDT	Special Weather Statement	FWD	Collin	30 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.