Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 210, NWS Fort Worth, TX

May 9, 2009Collin County, Grayson County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at May 9, 2009, 12:44 AM CDT for Collin County, Grayson County, Texas. It was in force for 61 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 9, 2009, 12:44 AM CDT (05:44 UTC)
Expired
May 9, 2009, 1:45 AM CDT
In force
61 min
Issued by
NWS Fort Worth, TX
Area
Storm-based polygon

Counties Collin County, TX, Grayson County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 112 km from the middle of the area, began a volume at 05:46 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 8, 11:48 PM CDTTornado WatchSPC5 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 5.7 hours before the alert went out and 89 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 2009-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4727 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 00:00Z on 2009-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 139 square meters per square second.19395878Sfc1 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
4727 J/kg
Mixed-layer CIN
-57 J/kg
Mixed-layer LCL
993 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
139 m²/s²
0-3 km storm-relative helicity
189 m²/s²
Significant tornado parameter
3.5
Supercell composite
16.7

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 9, 12:06 AM CDT, 38 minutes earlier.

Area forecast discussion, May 9, 12:06 AM CDT, 38 minutes before
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Hazardous weather outlook, May 8, 8:00 PM CDT, 4 hours 44 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE FORT WORTH TX
800 PM CDT FRI MAY 8 2009

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-100100-
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-
800 PM CDT FRI MAY 8 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH TEXAS.

.DAY ONE...TONIGHT.
THERE IS A CHANCE OF SEVERE THUNDERSTORMS THIS EVENING AND OVERNIGHT...
ESPECIALLY OVER THE NORTHWEST HALF OF NORTH TEXAS. LARGE HAIL AND
VERY HEAVY RAINFALL WILL BE THE PRIMARY HAZARDS. LOCALIZED FLASH
FLOODING IN ALSO POSSIBLE.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.
THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS THIS WEEKEND AND
INTO MONDAY...MAINLY OVER THE NORTHERN HALF...AS THE COLD FRONT
FLUCTUATES AROUND NORTH TEXAS. THE MAIN SEVERE WEATHER THREATS
WILL BE LARGE HAIL...DAMAGING WINDS...AND LOCALLY HEAVY RAINFALL.
THERE WILL BE ANOTHER CHANCE OF THUNDERSTORMS WEDNESDAY THROUGH
THURSDAY.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS LIKELY TONIGHT...ESPECIALLY WEST OF THE
INTERSTATE 35 CORRIDOR.

In the hours before

Local storm report, May 9, 12:07 AM CDT, 37 minutes before
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Local storm report, May 9, 12:08 AM CDT, 36 minutes before
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Local storm report, May 9, 12:11 AM CDT, 33 minutes before
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Local storm report, May 9, 12:24 AM CDT, 20 minutes before
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Local storm report, May 9, 12:28 AM CDT, 16 minutes before
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Local storm report, May 9, 12:37 AM CDT, 7 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
May 8, 7:10 PM CDTSevere Thunderstorm WarningFWDJack55 min
May 8, 7:12 PM CDTSevere Thunderstorm WarningFWDComanche63 min
May 8, 7:16 PM CDTSevere Thunderstorm WarningFWDMontague59 min
May 8, 7:43 PM CDTSevere Thunderstorm WarningFWDComanche, Eastland23 min
May 8, 8:02 PM CDTAreal Flood AdvisoryFWDComanche118 min
May 8, 8:14 PM CDTSevere Thunderstorm WarningFWDMontague61 min
May 8, 8:22 PM CDTSevere Thunderstorm WarningFWDStephens38 min
May 8, 8:32 PM CDTSevere Thunderstorm WarningFWDMills58 min
May 8, 8:45 PM CDTTornado WarningFWDMontague30 min
May 8, 8:54 PM CDTSevere Thunderstorm WarningFWDPalo Pinto, Stephens66 min
May 8, 9:14 PM CDTSevere Thunderstorm WarningFWDMontague61 min
May 8, 9:18 PM CDTAreal Flood AdvisoryFWDMontague117 min
May 8, 9:33 PM CDTSevere Thunderstorm WarningFWDJack, Palo Pinto27 min
May 8, 9:34 PM CDTSpecial Weather StatementFWDCooke26 min
May 8, 10:02 PM CDTTornado WarningFWDMontague28 min
May 8, 10:05 PM CDTSevere Thunderstorm WarningFWDCooke, Grayson55 min
May 8, 10:14 PM CDTSevere Thunderstorm WarningFWDCooke, Montague61 min
May 8, 10:31 PM CDTSevere Thunderstorm WarningFWDGrayson29 min
May 8, 10:38 PM CDTAreal Flood AdvisoryFWDCooke, Grayson3 hr
May 8, 10:47 PM CDTSevere Thunderstorm WarningFWDFannin, Grayson58 min
May 8, 10:59 PM CDTSevere Thunderstorm WarningFWDCooke, Grayson61 min
May 8, 11:11 PM CDTFlash Flood WarningFWDGrayson3 hr
May 8, 11:15 PM CDTSevere Thunderstorm WarningFWDCooke41 min
May 8, 11:45 PM CDTSevere Thunderstorm WarningFWDCollin, Fannin, Grayson, Hunt60 min
May 9, 12:00 AM CDTSevere Thunderstorm WarningFWDCooke60 min
May 9, 12:34 AM CDTSevere Thunderstorm WarningFWDDenton26 min
May 9, 12:43 AM CDTSevere Thunderstorm WarningFWDFannin, Hunt62 min
May 9, 1:05 AM CDTSpecial Weather StatementFWDDelta25 min
May 9, 1:44 AM CDTSevere Thunderstorm WarningFWDFannin, Grayson61 min
May 9, 2:03 AM CDTSpecial Weather StatementFWDDelta, Lamar27 min
May 9, 2:22 AM CDTSevere Thunderstorm WarningFWDDelta, Lamar53 min
May 9, 2:45 AM CDTSevere Thunderstorm WarningFWDFannin, Hunt18 min
May 9, 12:16 PM CDTSpecial Weather StatementFWDLamar59 min
May 9, 12:26 PM CDTSpecial Weather StatementFWDFannin34 min
May 9, 12:57 PM CDTSpecial Weather StatementFWDLamar33 min
May 9, 1:02 PM CDTSevere Thunderstorm WarningFWDLamar58 min
May 9, 1:25 PM CDTSpecial Weather StatementFWDHopkins35 min
May 9, 1:41 PM CDTSpecial Weather StatementFWDFannin, Grayson34 min
May 9, 2:19 PM CDTSpecial Weather StatementFWDFannin, Grayson26 min
May 9, 2:43 PM CDTSpecial Weather StatementFWDLamar32 min
May 9, 2:46 PM CDTSpecial Weather StatementFWDFannin59 min
May 9, 3:16 PM CDTSpecial Weather StatementFWDLamar59 min
May 9, 3:17 PM CDTFlash Flood WatchFWDCollin, Cooke, Delta, Fannin, Grayson, Hopkins and 3 more47 hr
May 9, 3:42 PM CDTSevere Thunderstorm WarningFWDFannin, Lamar48 min
May 9, 4:06 PM CDTSevere Thunderstorm WarningFWDLamar54 min
May 9, 5:05 PM CDTAreal Flood AdvisoryFWDLamar85 min
May 9, 5:22 PM CDTSpecial Weather StatementFWDLamar23 min
May 9, 6:31 PM CDTAreal Flood AdvisoryFWDLamar119 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.