Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 413, NWS Fort Worth, TX

August 5, 2009Denton County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Aug 5, 2009, 5:12 PM CDT for Denton County, Texas. It was in force for 33 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: Aug 5, 2009, 5:12 PM CDT (22:12 UTC)
Expired: Aug 5, 2009, 5:45 PM CDT
In force: 33 min
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon

County Denton County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 72 km from the middle of the area, began a volume at 22:14 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
Aug 5, 3:21 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 10.2 hours before the alert went out and 45 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: 1896 J/kg
Mixed-layer CIN: -237 J/kg
Mixed-layer LCL: 1450 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.1

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 Aug 5, 5:07 PM CDT, 5 minutes earlier.

Area forecast discussion, Aug 5, 5:07 PM CDT, 5 minutes before

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Hazardous weather outlook, Aug 5, 2:25 PM CDT, 2 hours 47 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE FORT WORTH TX
225 PM CDT WED AUG 5 2009

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-061200-
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-
225 PM CDT WED AUG 5 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH TEXAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT.
A HEAT ADVISORY IS IN EFFECT FOR THE METROPLEX AND ALSO LOCATIONS
ALONG AND SOUTH OF A LINE FROM WACO TO PALESTINE FOR AFTERNOON HEAT
INDICES NEAR 105 DEGREES AND OVERNIGHT LOWS IN THE UPPER 70S.

THUNDERSTORMS ARE POSSIBLE GENERALLY ALONG AND NORTH OF INTERSTATE
20 THROUGH THIS EVENING...WITH THE HIGHEST CHANCES ALONG THE RED
RIVER. FREQUENT CLOUD TO GROUND LIGHTNING...QUARTER SIZE
HAIL...AND WIND GUSTS IN EXCESS OF 60 MPH MAY ACCOMPANY THE
STRONGEST STORMS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.
THE HEAT ADVISORY CONTINUES THROUGH THURSDAY AFTERNOON FOR THE
METROPLEX AND ALSO LOCATIONS ALONG AND SOUTH OF A LINE FROM WACO
TO PALESTINE.

THUNDERSTORMS WILL BE POSSIBLE ACROSS NORTHEAST SECTIONS OF NORTH
TEXAS ON THURSDAY...AND OVER AREAS GENERALLY EAST OF INTERSTATE 35
SATURDAY THROUGH TUESDAY.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION MAY BE REQUESTED NORTH OF INTERSTATE 20 THROUGH
THIS EVENING.

SCHULTZ

In the hours before

Special weather statement, Aug 5, 4:43 PM CDT, 29 minutes before

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Special weather statement, Aug 5, 4:48 PM CDT, 24 minutes before

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Local storm report, Aug 5, 4:52 PM CDT, 20 minutes before

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Local storm report, Aug 5, 4:55 PM CDT, 17 minutes before

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Local storm report, Aug 5, 5:00 PM CDT, 12 minutes before

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Special weather statement, Aug 5, 5:09 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
Aug 5, 10:27 AM CDT	Special Weather Statement	FWD	Delta, Lamar	33 min
Aug 5, 2:38 PM CDT	Special Weather Statement	FWD	Lamar	22 min
Aug 5, 3:11 PM CDT	Severe Thunderstorm Warning	FWD	Fannin	64 min
Aug 5, 3:18 PM CDT	Special Weather Statement	FWD	Lamar	27 min
Aug 5, 3:45 PM CDT	Severe Thunderstorm Warning	FWD	Fannin, Grayson	60 min
Aug 5, 3:56 PM CDT	Severe Thunderstorm Warning	FWD	Grayson	64 min
Aug 5, 4:02 PM CDT	Areal Flood Advisory	FWD	Fannin	118 min
Aug 5, 4:06 PM CDT	Severe Thunderstorm Warning	FWD	Cooke	54 min
Aug 5, 4:25 PM CDT	Severe Thunderstorm Warning	FWD	Grayson	35 min
Aug 5, 4:31 PM CDT	Areal Flood Advisory	FWD	Grayson	3 hr
Aug 5, 4:43 PM CDT	Special Weather Statement	FWD	Montague	32 min
Aug 5, 4:45 PM CDT	Severe Thunderstorm Warning	FWD	Grayson	15 min
Aug 5, 4:48 PM CDT	Special Weather Statement	FWD	Collin, Denton	27 min
Aug 5, 4:53 PM CDT	Severe Thunderstorm Warning	FWD	Cooke	49 min
Aug 5, 4:55 PM CDT	Severe Thunderstorm Warning	FWD	Grayson	34 min
Aug 5, 5:06 PM CDT	Severe Thunderstorm Warning	FWD	Montague	54 min
Aug 5, 5:09 PM CDT	Special Weather Statement	FWD	Collin, Denton, Wise	21 min
Aug 5, 5:19 PM CDT	Severe Thunderstorm Warning	FWD	Collin	17 min
Aug 5, 5:26 PM CDT	Severe Thunderstorm Warning	FWD	Wise	38 min
Aug 5, 5:42 PM CDT	Special Weather Statement	FWD	Dallas, Rockwall, Tarrant, Wise	33 min
Aug 5, 5:47 PM CDT	Severe Thunderstorm Warning	FWD	Cooke	31 min
Aug 5, 6:02 PM CDT	Severe Thunderstorm Warning	FWD	Montague	40 min
Aug 5, 6:16 PM CDT	Special Weather Statement	FWD	Dallas, Parker, Tarrant	29 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.