Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 71, NWS Fort Worth, TX

March 31, 2009Ellis County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Mar 31, 2009, 12:28 AM CDT for Ellis County, Texas. It was in force for 62 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: Mar 31, 2009, 12:28 AM CDT (05:28 UTC)
Expired: Mar 31, 2009, 1:30 AM CDT
In force: 62 min
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon

County Ellis County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 54 km from the middle of the area, began a volume at 05:28 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
Mar 30, 8:49 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 5.5 hours before the alert went out and 71 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: 650 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 1357 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 216 m²/s²
0-3 km storm-relative helicity: 415 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 12.5

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 Fort Worth, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Mar 31, 12:21 AM CDT, 7 minutes earlier.

Area forecast discussion, Mar 31, 12:21 AM CDT, 7 minutes before

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Hazardous weather outlook, Mar 31, 12:28 AM CDT, 0 minutes before

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In the hours before

Local storm report, Mar 30, 11:06 PM CDT, 1 hour 22 minutes before

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Local storm report, Mar 30, 11:13 PM CDT, 1 hour 15 minutes before

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Local storm report, Mar 30, 11:23 PM CDT, 1 hour 5 minutes before

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Local storm report, Mar 30, 11:37 PM CDT, 51 minutes before

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Special weather statement, Mar 31, 12:26 AM CDT, 2 minutes before

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Special weather statement, Mar 31, 12:27 AM CDT, 1 minute 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
Mar 30, 8:38 PM CDT	Special Weather Statement	FWD	Montague	37 min
Mar 30, 8:52 PM CDT	Severe Thunderstorm Warning	FWD	Montague	38 min
Mar 30, 9:02 PM CDT	Special Weather Statement	FWD	Jack	18 min
Mar 30, 9:23 PM CDT	Severe Thunderstorm Warning	FWD	Jack, Wise	52 min
Mar 30, 9:31 PM CDT	Severe Thunderstorm Warning	FWD	Parker	59 min
Mar 30, 9:33 PM CDT	Severe Thunderstorm Warning	FWD	Cooke, Montague	57 min
Mar 30, 10:09 PM CDT	Severe Thunderstorm Warning	FWD	Denton, Tarrant, Wise	66 min
Mar 30, 10:26 PM CDT	Severe Thunderstorm Warning	FWD	Parker, Tarrant	64 min
Mar 30, 10:29 PM CDT	Severe Thunderstorm Warning	FWD	Cooke	46 min
Mar 30, 10:49 PM CDT	Severe Thunderstorm Warning	FWD	Dallas	56 min
Mar 30, 10:55 PM CDT	Special Weather Statement	FWD	Hood, Johnson, Somervell	65 min
Mar 30, 11:00 PM CDT	Special Weather Statement	FWD	Bosque	90 min
Mar 30, 11:15 PM CDT	Severe Thunderstorm Warning	FWD	Johnson, Somervell	60 min
Mar 30, 11:25 PM CDT	Severe Thunderstorm Warning	FWD	Ellis	65 min
Mar 30, 11:41 PM CDT	Severe Thunderstorm Warning	FWD	Collin, Dallas, Rockwall	50 min
Mar 30, 11:52 PM CDT	Severe Thunderstorm Warning	FWD	Hill	53 min
Mar 31, 12:06 AM CDT	Severe Thunderstorm Warning	FWD	Kaufman	54 min
Mar 31, 12:26 AM CDT	Special Weather Statement	FWD	Bosque	34 min
Mar 31, 12:27 AM CDT	Special Weather Statement	FWD	Hunt	33 min
Mar 31, 12:52 AM CDT	Special Weather Statement	FWD	Hill	23 min
Mar 31, 12:54 AM CDT	Special Weather Statement	FWD	Navarro	36 min
Mar 31, 1:15 AM CDT	Special Weather Statement	FWD	Henderson	30 min
Mar 31, 1:26 AM CDT	Special Weather Statement	FWD	Navarro	34 min
Mar 31, 1:47 AM CDT	Special Weather Statement	FWD	Van Zandt	28 min
Mar 31, 2:12 AM CDT	Special Weather Statement	FWD	Henderson	33 min
Mar 31, 5:21 AM CDT	Special Weather Statement	FWD	Robertson	24 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.