Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 133, NWS Fort Worth, TX

May 2, 2009Collin County, Denton County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at May 2, 2009, 2:57 PM CDT for Collin County, Denton County, Texas. It was in force for 63 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
May 2, 2009, 2:57 PM CDT (19:57 UTC)
Expired
May 2, 2009, 4:00 PM CDT
In force
63 min
Issued by
NWS Fort Worth, TX
Area
Storm-based polygon

Counties Collin County, TX, Denton County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 82 km from the middle of the area, began a volume at 19:57 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.

IssuedProductOfficeLasted
May 2, 12:17 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 8.0 hours before the alert went out and 58 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-pSkew-T log-p diagram, Fort Worth, TX at 12:00Z on 2009-05-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1140 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Worth, TX at 12:00Z on 2009-05-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 194 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1140 J/kg
Mixed-layer CIN
-217 J/kg
Mixed-layer LCL
504 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
194 m²/s²
0-3 km storm-relative helicity
214 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.6

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 May 2, 12:34 PM CDT, 2 hours 23 minutes earlier.

Area forecast discussion, May 2, 12:34 PM CDT, 2 hours 23 minutes before
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Hazardous weather outlook, May 2, 11:12 AM CDT, 3 hours 45 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE FORT WORTH TX
1112 AM CDT SAT MAY 2 2009

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-031100-
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-
1112 AM CDT SAT MAY 2 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH TEXAS.

.DAY ONE...TODAY AND TONIGHT.
STRONG TO SEVERE THUNDERSTORMS ARE POSSIBLE ACROSS NORTH TEXAS
THIS AFTERNOON AND EVENING. LARGE HAIL...DAMAGING WINDS...AND
HEAVY RAIN WILL BE THE PRIMARY HAZARDS. IN ADDITION...THERE IS
THE POTENTIAL FOR A STORM TO BECOME TORNADIC NEAR OR SOUTH OF A
SLOW-MOVING COLD FRONT.

THE GREATEST LIKELIHOOD OF HEAVY RAIN WILL BE NORTHEAST OF THE
DALLAS/FORT WORTH METROPLEX. A FLASH FLOOD WATCH REMAINS IN EFFECT
GENERALLY ALONG AND NORTH OF THE I-20 CORRIDOR.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.
THE THREAT FOR STRONG TO SEVERE THUNDERSTORMS AND HEAVY RAINFALL
WILL CONTINUE ON SUNDAY...WITH THE FLASH FLOOD WATCH REMAINING IN
EFFECT.

THUNDERSTORMS ARE POSSIBLE TUESDAY NIGHT THROUGH THURSDAY...AND
AGAIN FRIDAY NIGHT.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION WILL LIKELY BE REQUESTED THIS AFTERNOON AND
EVENING.

25

In the hours before

Local storm report, May 2, 2:40 PM CDT, 17 minutes before
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Local storm report, May 2, 2:41 PM CDT, 16 minutes before
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Local storm report, May 2, 2:47 PM CDT, 10 minutes before
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Local storm report, May 2, 2:48 PM CDT, 9 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
248 PM CDT SAT MAY 02 2009

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

0247 PM     HAIL             BENBROOK                32.68N  97.46W
05/02/2009  M0.88 INCH       TARRANT            TX   AMATEUR RADIO

            EAST BENBROOK
Local storm report, May 2, 2:49 PM CDT, 8 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
249 PM CDT SAT MAY 02 2009

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

0248 PM     HAIL             BENBROOK                32.68N  97.46W
05/02/2009  E1.00 INCH       TARRANT            TX   AMATEUR RADIO

            BENBROOK
Local storm report, May 2, 2:53 PM CDT, 4 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
253 PM CDT SAT MAY 02 2009

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

0247 PM     HAIL             10 SE CELINA            33.22N  96.66W
05/02/2009  E1.00 INCH       COLLIN             TX   LAW ENFORCEMENT

The office that day

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

IssuedProductOfficeCountiesLasted
May 1, 8:31 PM CDTRiver Flood WarningFWDJack12 hr
May 2, 1:07 PM CDTSpecial Weather StatementFWDWise23 min
May 2, 1:17 PM CDTSevere Thunderstorm WarningFWDWise43 min
May 2, 1:31 PM CDTSpecial Weather StatementFWDHood29 min
May 2, 1:44 PM CDTSevere Thunderstorm WarningFWDPalo Pinto, Parker61 min
May 2, 1:50 PM CDTSpecial Weather StatementFWDDenton25 min
May 2, 2:03 PM CDTSpecial Weather StatementFWDTarrant27 min
May 2, 2:19 PM CDTSevere Thunderstorm WarningFWDHood, Johnson, Tarrant56 min
May 2, 2:27 PM CDTSpecial Weather StatementFWDEllis33 min
May 2, 2:32 PM CDTSpecial Weather StatementFWDDenton, Wise58 min
May 2, 2:41 PM CDTSevere Thunderstorm WarningFWDEllis49 min
May 2, 2:50 PM CDTAreal Flood AdvisoryFWDDenton, Tarrant115 min
May 2, 2:53 PM CDTSevere Thunderstorm WarningFWDErath52 min
May 2, 3:06 PM CDTSpecial Weather StatementFWDMontague24 min
May 2, 3:06 PM CDTSevere Thunderstorm WarningFWDDallas39 min
May 2, 3:20 PM CDTAreal Flood AdvisoryFWDCollin, Dallas, Grayson3 hr
May 2, 3:22 PM CDTSevere Thunderstorm WarningFWDHood38 min
May 2, 3:40 PM CDTSevere Thunderstorm WarningFWDFannin, Hunt, Kaufman, Rains, Rockwall50 min
May 2, 3:44 PM CDTSevere Thunderstorm WarningFWDDallas14 min
May 2, 3:47 PM CDTTornado WarningFWDCollin, Hunt, Rockwall43 min
May 2, 4:00 PM CDTSevere Thunderstorm WarningFWDErath, Hood, Johnson, Parker45 min
May 2, 4:04 PM CDTAreal Flood AdvisoryFWDFannin, Hunt, Rockwall3 hr
May 2, 4:08 PM CDTSevere Thunderstorm WarningFWDDelta, Hopkins, Lamar, Rains52 min
May 2, 4:24 PM CDTTornado WarningFWDDelta, Hopkins, Lamar51 min
May 2, 4:38 PM CDTSevere Thunderstorm WarningFWDJohnson, Parker, Tarrant67 min
May 2, 4:39 PM CDTAreal Flood AdvisoryFWDDelta, Hopkins, Lamar, Rains3 hr
May 2, 4:53 PM CDTSevere Thunderstorm WarningFWDBosque, Erath, Hood, Somervell67 min
May 2, 4:59 PM CDTAreal Flood AdvisoryFWDTarrant2 hr
May 2, 5:18 PM CDTFlash Flood WarningFWDTarrant3 hr
May 2, 5:42 PM CDTSevere Thunderstorm WarningFWDDallas, Ellis, Hood, Johnson, Parker, Tarrant63 min
May 2, 5:52 PM CDTRiver Flood WarningFWDDallas5 hr
May 2, 6:02 PM CDTFlash Flood WarningFWDDallas3 hr
May 2, 6:06 PM CDTSevere Thunderstorm WarningFWDDenton54 min
May 2, 6:44 PM CDTSevere Thunderstorm WarningFWDCollin, Dallas, Hunt, Kaufman, Rockwall61 min
May 2, 6:58 PM CDTFlash Flood WarningFWDCollin, Hunt, Kaufman, Rockwall4 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2009Every 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.