Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 474, NWS Fort Worth, TX

October 1, 2009Dallas County, Denton County, Tarrant County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Oct 1, 2009, 5:39 PM CDT for Dallas County, Denton County, Tarrant County, Texas. It was in force for 66 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: Oct 1, 2009, 5:39 PM CDT (22:39 UTC)
Expired: Oct 1, 2009, 6:45 PM CDT
In force: 66 min
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon

Counties Dallas County, TX, Denton County, TX, Tarrant County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 44 km from the middle of the area, began a volume at 22:40 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
Oct 1, 3:50 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 10.7 hours before the alert went out and 23 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: 1985 J/kg
Mixed-layer CIN: -89 J/kg
Mixed-layer LCL: 530 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 264 m²/s²
0-3 km storm-relative helicity: 410 m²/s²
Significant tornado parameter: 2.0
Supercell composite: 8.4

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 Fort Worth, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Oct 1, 2:51 PM CDT, 2 hours 48 minutes earlier.

Area forecast discussion, Oct 1, 2:51 PM CDT, 2 hours 48 minutes before

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Hazardous weather outlook, Oct 1, 2:53 PM CDT, 2 hours 46 minutes before

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In the hours before

Special weather statement, Oct 1, 4:36 PM CDT, 1 hour 3 minutes before

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Special weather statement, Oct 1, 4:49 PM CDT, 50 minutes before

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Local storm report, Oct 1, 4:56 PM CDT, 43 minutes before

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Local storm report, Oct 1, 4:57 PM CDT, 42 minutes before

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Local storm report, Oct 1, 5:11 PM CDT, 28 minutes before

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Special weather statement, Oct 1, 5:17 PM CDT, 22 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
Oct 1, 3:22 PM CDT	Special Weather Statement	FWD	Mills	23 min
Oct 1, 3:47 PM CDT	Special Weather Statement	FWD	Mills	28 min
Oct 1, 3:54 PM CDT	Special Weather Statement	FWD	Cooke	36 min
Oct 1, 4:08 PM CDT	Severe Thunderstorm Warning	FWD	Mills	52 min
Oct 1, 4:20 PM CDT	Severe Thunderstorm Warning	FWD	Erath	40 min
Oct 1, 4:22 PM CDT	Severe Thunderstorm Warning	FWD	Cooke	38 min
Oct 1, 4:27 PM CDT	Special Weather Statement	FWD	Parker	33 min
Oct 1, 4:36 PM CDT	Special Weather Statement	FWD	Parker	24 min
Oct 1, 4:36 PM CDT	Severe Thunderstorm Warning	FWD	Denton	39 min
Oct 1, 4:42 PM CDT	Severe Thunderstorm Warning	FWD	Grayson	48 min
Oct 1, 4:45 PM CDT	Severe Thunderstorm Warning	FWD	Bosque, Hamilton	31 min
Oct 1, 4:48 PM CDT	Severe Thunderstorm Warning	FWD	Coryell, Lampasas	57 min
Oct 1, 4:49 PM CDT	Special Weather Statement	FWD	Hood	26 min
Oct 1, 4:52 PM CDT	Severe Thunderstorm Warning	FWD	Denton, Wise	53 min
Oct 1, 4:56 PM CDT	Severe Thunderstorm Warning	FWD	Parker, Tarrant	64 min
Oct 1, 5:08 PM CDT	Severe Thunderstorm Warning	FWD	Hood, Johnson	67 min
Oct 1, 5:15 PM CDT	Severe Thunderstorm Warning	FWD	Denton	45 min
Oct 1, 5:17 PM CDT	Special Weather Statement	FWD	Collin	28 min
Oct 1, 6:00 PM CDT	Severe Thunderstorm Warning	FWD	Collin, Hunt	45 min
Oct 1, 6:14 PM CDT	Severe Thunderstorm Warning	FWD	Coryell, Lampasas	46 min
Oct 1, 6:30 PM CDT	Special Weather Statement	FWD	Rockwall	60 min
Oct 1, 6:43 PM CDT	Special Weather Statement	FWD	Ellis	32 min
Oct 1, 6:46 PM CDT	Special Weather Statement	FWD	Mills	29 min
Oct 1, 6:51 PM CDT	Severe Thunderstorm Warning	FWD	Coryell, Lampasas	39 min
Oct 1, 6:54 PM CDT	Special Weather Statement	FWD	Kaufman	66 min

Nearby

Severe Thunderstorm Warnings in Texas, 2009 Every severe thunderstorm warning in 2009

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.