Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 74, NWS Fort Worth, TX

April 11, 2009Fannin County, Lamar County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Apr 11, 2009, 10:21 PM CDT for Fannin County, Lamar County, Texas. It was in force for 24 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
Apr 11, 2009, 10:21 PM CDT (03:21 UTC)
Expired
Apr 11, 2009, 10:45 PM CDT
In force
24 min
Issued by
NWS Fort Worth, TX
Area
Storm-based polygon

Counties Fannin County, TX, Lamar County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 180 km from the middle of the area, began a volume at 03:24 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 nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 3.4 hours before the alert went out and 162 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 00:00Z on 2009-04-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 00:00Z on 2009-04-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 158 square meters per square second.1939587897117Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1736 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
158 m²/s²
0-3 km storm-relative helicity
304 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

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 Apr 11, 8:01 PM CDT, 2 hours 20 minutes earlier.

Area forecast discussion, Apr 11, 8:01 PM CDT, 2 hours 20 minutes before
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Hazardous weather outlook, Apr 11, 3:22 PM CDT, 6 hours 59 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE FORT WORTH TX
322 PM CDT SAT APR 11 2009

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-121145-
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-
322 PM CDT SAT APR 11 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH TEXAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

THUNDERSTORMS WILL DEVELOP AND BECOME WIDESPREAD LATE TONIGHT AS
A STRONG UPPER LEVEL STORM SYSTEM APPROACHES THE AREA. SOME OF
THESE STORMS COULD BECOME SEVERE WITH LARGE HAIL THE PRIMARY THREAT. IN
ADDITION... LOCALLY HEAVY RAINFALL WILL BE POSSIBLE ACROSS NORTH
TEXAS LATE TONIGHT WITH AMOUNTS OF 1 TO 2 INCHES WILL BE POSSIBLE
THROUGH EARLY SUNDAY...WITH LOCALIZED HIGHER AMOUNTS POSSIBLE.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH SATURDAY.

THUNDERSTORMS WILL BE ONGOING SUNDAY MORNING ACROSS MOST OF NORTH
TEXAS AND WILL END FROM WEST TO EAST DURING THE DAY. SOME SEVERE
THUNDERSTORMS WILL REMAIN POSSIBLE SUNDAY WITH LARGE HAIL AND
STRONG WINDS BEING THE MAIN THREATS. LOCALLY HEAVY RAINFALL AND
FLOODING OF LOW LYING AREAS WILL BE POSSIBLE.

THERE IS A CHANCE OF THUNDERSTORMS ACROSS ALL OF NORTH TEXAS
THURSDAY THROUGH SATURDAY. SEVERE THUNDERSTORMS WILL BE POSSIBLE.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION WILL LIKELY BE NEEDED TONIGHT AND SUNDAY.

07/BB

In the hours before

Special weather statement, Apr 11, 7:00 PM CDT, 3 hours 21 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
700 PM CDT SAT APR 11 2009

TXZ117-120030-
PARKER TX-
700 PM CDT SAT APR 11 2009

...SIGNIFICANT WEATHER ADVISORY FOR...
  PARKER COUNTY

AT 700 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
STRONG THUNDERSTORM 7 MILES SOUTH OF WEATHERFORD...MOVING NORTHEAST
AT 45 MPH.

CITIES IN THE PATH OF THIS STORM INCLUDE ALEDO...ANNETTA...COOL...
HUDSON OAKS...RENO...SPRINGTOWN...WEATHERFORD...WILLOW PARK...
POOLVILLE AND MINERAL WELLS STATE PARK.

PEA TO HALF INCH SIZED HAIL AND WIND GUSTS TO 40 MPH CAN BE EXPECTED
FROM THIS STORM.

IF THIS STORM CONTINUES ON ITS PRESENT COURSE...A SEVERE WEATHER
WARNING MAY BE NEEDED.

LAT...LON 3300 9801 3298 9757 3297 9756 3294 9756
      3282 9754 3256 9767 3258 9775 3269 9806
      3291 9806
TIME...MOT...LOC 0000Z 205DEG 40KT 3268 9773
Local storm report, Apr 11, 7:07 PM CDT, 3 hours 14 minutes before
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Local storm report, Apr 11, 7:31 PM CDT, 2 hours 50 minutes before
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Local storm report, Apr 11, 7:37 PM CDT, 2 hours 44 minutes before
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Special weather statement, Apr 11, 7:52 PM CDT, 2 hours 29 minutes before
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Special weather statement, Apr 11, 10:16 PM CDT, 5 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Apr 11, 7:00 PM CDTSpecial Weather StatementFWDParker30 min
Apr 11, 7:03 PM CDTSevere Thunderstorm WarningFWDParker26 min
Apr 11, 7:19 PM CDTSevere Thunderstorm WarningFWDTarrant, Wise26 min
Apr 11, 7:52 PM CDTSpecial Weather StatementFWDDallas38 min
Apr 11, 10:16 PM CDTSpecial Weather StatementFWDFannin29 min
Apr 11, 11:18 PM CDTSpecial Weather StatementFWDLamar27 min
Apr 12, 2:59 AM CDTSpecial Weather StatementFWDEastland31 min
Apr 12, 3:25 AM CDTSpecial Weather StatementFWDComanche, Erath35 min
Apr 12, 5:15 AM CDTAreal Flood AdvisoryFWDTarrant2 hr
Apr 12, 5:18 AM CDTAreal Flood AdvisoryFWDTarrant117 min
Apr 12, 5:39 AM CDTAreal Flood AdvisoryFWDDallas, Ellis3 hr
Apr 12, 6:44 AM CDTSpecial Weather StatementFWDKaufman31 min
Apr 12, 7:21 AM CDTSpecial Weather StatementFWDAnderson, Freestone24 min
Apr 12, 7:43 AM CDTRiver Flood WarningFWDDallas9 hr
Apr 12, 8:03 AM CDTSpecial Weather StatementFWDAnderson, Henderson27 min
Apr 12, 8:38 AM CDTSpecial Weather StatementFWDAnderson37 min
Apr 12, 4:36 PM CDTSpecial Weather StatementFWDWise24 min
Apr 12, 4:39 PM CDTSpecial Weather StatementFWDWise36 min
Apr 12, 4:44 PM CDTSevere Thunderstorm WarningFWDJack, Parker, Tarrant, Wise61 min
Apr 12, 5:50 PM CDTSpecial Weather StatementFWDDenton25 min
Apr 12, 6:08 PM CDTSevere Thunderstorm WarningFWDMontague52 min
Apr 12, 6:31 PM CDTSevere Thunderstorm WarningFWDMontague59 min

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.