Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 370, NWS Fort Worth, TX

July 19, 2009Denton County, Tarrant County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Jul 19, 2009, 3:26 PM CDT for Denton County, Tarrant County, Texas. It was in force for 52 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 19, 2009, 3:26 PM CDT (20:26 UTC)
Expired: Jul 19, 2009, 4:18 PM CDT
In force: 52 min
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon

Counties Denton County, TX, Tarrant County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 47 km from the middle of the area, began a volume at 20:27 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
Jul 19, 2:36 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 8.4 hours before the alert went out and 328 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: 457 J/kg
Mixed-layer CIN: -171 J/kg
Mixed-layer LCL: 1343 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.8

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 19, 3:20 PM CDT, 6 minutes earlier.

Area forecast discussion, Jul 19, 3:20 PM CDT, 6 minutes before

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Hazardous weather outlook, Jul 19, 1:53 PM CDT, 1 hour 33 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE FORT WORTH TX
153 PM CDT SUN JUL 19 2009

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-201200-
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-
153 PM CDT SUN JUL 19 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH TEXAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT.
ISOLATED SEVERE THUNDERSTORMS WITH DAMAGING MICROBURST WINDS TO 60 MPH...
LOCALLY HEAVY RAINFALL IN EXCESS OF ONE INCH...AND POSSIBLY SMALL HAIL
ARE POSSIBLE THROUGH EARLY EVENING.

WIDELY SCATTERED STORMS ARE EXPECTED ACROSS ALL OF NORTH TEXAS TODAY...WITH
BEST CHANCES OVER EAST OF INTERSTATE 35 THIS AFTERNOON. OVERNIGHT...LOW
CHANCES WILL PERSIST WEST OF INTERSTATE 35 CORRIDOR.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.
SCATTERED THUNDERSTORMS WILL BE POSSIBLE ACROSS NORTH TEXAS THROUGH
WEDNESDAY. AN ISOLATED SEVERE STORM WILL BE POSSIBLE...ESPECIALLY
ON TUESDAY.

.SPOTTER INFORMATION STATEMENT...
LIMITED SPOTTER ACTIVATION MAY BE REQUESTED...MAINLY ACROSS THE
EASTERN HALF OF NORTH TEXAS THROUGH EARLY EVENING.

05/

In the hours before

Special weather statement, Jul 19, 2:51 PM CDT, 35 minutes before

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Local storm report, Jul 19, 2:54 PM CDT, 32 minutes before

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Special weather statement, Jul 19, 3:01 PM CDT, 25 minutes before

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Local storm report, Jul 19, 3:03 PM CDT, 23 minutes before

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Special weather statement, Jul 19, 3:14 PM CDT, 12 minutes before

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Special weather statement, Jul 19, 3:15 PM CDT, 11 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 19, 1:38 PM CDT	Special Weather Statement	FWD	Denton	37 min
Jul 19, 1:45 PM CDT	Special Weather Statement	FWD	Collin	30 min
Jul 19, 2:02 PM CDT	Severe Thunderstorm Warning	FWD	Denton	44 min
Jul 19, 2:11 PM CDT	Severe Thunderstorm Warning	FWD	Collin, Dallas, Rockwall	64 min
Jul 19, 2:40 PM CDT	Severe Thunderstorm Warning	FWD	Dallas, Kaufman, Rockwall	65 min
Jul 19, 2:51 PM CDT	Special Weather Statement	FWD	Freestone	24 min
Jul 19, 3:01 PM CDT	Special Weather Statement	FWD	Collin	29 min
Jul 19, 3:09 PM CDT	Severe Thunderstorm Warning	FWD	Collin	66 min
Jul 19, 3:14 PM CDT	Special Weather Statement	FWD	Tarrant	31 min
Jul 19, 3:15 PM CDT	Special Weather Statement	FWD	Navarro	30 min
Jul 19, 3:48 PM CDT	Severe Thunderstorm Warning	FWD	Freestone	35 min
Jul 19, 3:53 PM CDT	Severe Thunderstorm Warning	FWD	Leon	67 min
Jul 19, 4:22 PM CDT	Special Weather Statement	FWD	Parker	23 min
Jul 19, 4:37 PM CDT	Special Weather Statement	FWD	Parker	38 min
Jul 19, 4:47 PM CDT	Severe Thunderstorm Warning	FWD	Parker, Tarrant	58 min
Jul 19, 4:56 PM CDT	Special Weather Statement	FWD	Robertson	34 min
Jul 19, 5:31 PM CDT	Special Weather Statement	FWD	Robertson	29 min
Jul 19, 5:47 PM CDT	Special Weather Statement	FWD	Tarrant	28 min
Jul 19, 5:55 PM CDT	Special Weather Statement	FWD	Anderson	35 min
Jul 19, 5:59 PM CDT	Severe Thunderstorm Warning	FWD	Anderson, Henderson	31 min
Jul 19, 6:22 PM CDT	Special Weather Statement	FWD	Hill	23 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.