Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 494, NWS Fort Worth, TX

October 9, 2009Ellis County, Navarro County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Oct 9, 2009, 4:12 AM CDT for Ellis County, Navarro 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
Oct 9, 2009, 4:12 AM CDT (09:12 UTC)
Expired
Oct 9, 2009, 4:45 AM CDT
In force
33 min
Issued by
NWS Fort Worth, TX
Area
Storm-based polygon

Counties Ellis County, TX, Navarro County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 76 km from the middle of the area, began a volume at 09:15 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

Norman, OK (KOUN), launched 00:00Z, 9.2 hours before the alert went out and 343 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, Norman, OK at 00:00Z on 2009-10-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLEL10008507005003002001001 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, Norman, OK at 00:00Z on 2009-10-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -200 square meters per square second.1939587897Sfc1 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
1 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
453 m above ground
0-6 km bulk shear
71 kt
0-1 km storm-relative helicity
-200 m²/s²
0-3 km storm-relative helicity
44 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

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 Oct 9, 3:15 AM CDT, 57 minutes earlier.

Area forecast discussion, Oct 9, 3:15 AM CDT, 57 minutes before
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Hazardous weather outlook, Oct 8, 6:27 PM CDT, 9 hours 45 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE FORT WORTH TX
627 PM CDT THU OCT 8 2009

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-091145-
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-
627 PM CDT THU OCT 8 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH TEXAS.

.DAY ONE...TONIGHT.
NUMEROUS THUNDERSTORMS ARE EXPECTED TONIGHT AS A COLD FRONT AND
UPPER LEVEL DISTURBANCE MOVES INTO THE REGION. SOME STORMS MAY
BECOME SEVERE WITH DAMAGING WINDS AND LARGE HAIL. AN ISOLATED
TORNADO IS ALSO POSSIBLE. IN ADDITION TO THE SEVERE WEATHER
THREAT...HEAVY RAINFALL IS LIKELY TONIGHT...WHICH MAY LEAD TO
FLASH FLOODING. THEREFORE...A FLASH FLOOD WATCH IS IN EFFECT FOR
MUCH OF NORTH TEXAS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.
A COLD FRONT WILL PASS THROUGH THE AREA FROM NORTHWEST TO
SOUTHEAST DURING THE DAY ON FRIDAY. THUNDERSTORMS REMAIN LIKELY
NEAR AND AHEAD OF THE COLD FRONT. THESE STORMS ARE LIKELY TO
PRODUCE HEAVY RAINFALL WHICH MAY LEAD TO FLASH FLOODING. THE COLD
FRONT IS EXPECTED TO MOVE EAST OF NORTH TEXAS BY FRIDAY
AFTERNOON...BRINGING THUNDERSTORM CHANCES TO AN END.

THERE IS A SLIGHT CHANCE OF THUNDERSTORMS ACROSS MUCH OF NORTH
TEXAS SUNDAY THROUGH TUESDAY.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS LIKELY.

In the hours before

Special weather statement, Oct 8, 10:13 PM CDT, 5 hours 59 minutes before
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Local storm report, Oct 8, 10:15 PM CDT, 5 hours 57 minutes before
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Special weather statement, Oct 8, 10:30 PM CDT, 5 hours 42 minutes before
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Special weather statement, Oct 8, 11:10 PM CDT, 5 hours 2 minutes before
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Special weather statement, Oct 8, 11:57 PM CDT, 4 hours 15 minutes before
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Special weather statement, Oct 9, 4:05 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
Oct 8, 10:13 PM CDTSpecial Weather StatementFWDStephens, Young32 min
Oct 8, 10:30 PM CDTSpecial Weather StatementFWDJack, Palo Pinto30 min
Oct 8, 11:10 PM CDTSpecial Weather StatementFWDParker35 min
Oct 8, 11:57 PM CDTSpecial Weather StatementFWDYoung33 min
Oct 9, 3:05 AM CDTAreal Flood AdvisoryFWDDenton85 min
Oct 9, 3:22 AM CDTAreal Flood AdvisoryFWDJohnson, Tarrant113 min
Oct 9, 3:36 AM CDTAreal Flood AdvisoryFWDFannin3 hr
Oct 9, 3:41 AM CDTAreal Flood AdvisoryFWDDallas3 hr
Oct 9, 3:56 AM CDTRiver Flood WarningFWDDallas7 hr
Oct 9, 4:05 AM CDTSpecial Weather StatementFWDEllis, Navarro25 min
Oct 9, 4:11 AM CDTRiver Flood WarningFWDDenton16 hr
Oct 9, 4:22 AM CDTSpecial Weather StatementFWDBell, McLennan23 min
Oct 9, 4:29 AM CDTRiver Flood WarningFWDDallas6 hr
Oct 9, 4:43 AM CDTSpecial Weather StatementFWDHenderson, Kaufman, Rains, Van Zandt92 min
Oct 9, 4:49 AM CDTSpecial Weather StatementFWDEllis, Hill, Navarro26 min
Oct 9, 4:55 AM CDTSpecial Weather StatementFWDFalls, Limestone35 min
Oct 9, 5:16 AM CDTSpecial Weather StatementFWDMilam59 min
Oct 9, 5:17 AM CDTAreal Flood AdvisoryFWDHill118 min
Oct 9, 5:25 AM CDTRiver Flood WarningFWDCollin34 hr
Oct 9, 5:26 AM CDTSpecial Weather StatementFWDAnderson, Freestone64 min
Oct 9, 5:34 AM CDTSpecial Weather StatementFWDLeon, Robertson56 min
Oct 9, 6:07 AM CDTRiver Flood WarningFWDDallas51 hr
Oct 9, 6:15 AM CDTRiver Flood WarningFWDHunt33 hr
Oct 9, 8:29 AM CDTRiver Flood WarningFWDHunt, Rockwall35 hr
Oct 9, 8:56 AM CDTRiver Flood WarningFWDCollin25 hr
Oct 9, 9:53 AM CDTRiver Flood WarningFWDDelta, Lamar3 hr
Oct 9, 9:53 AM CDTRiver Flood WarningFWDDelta, Hopkins11 hr
Oct 9, 10:08 AM CDTAreal Flood AdvisoryFWDBell, Coryell, Falls, McLennan2 hr
Oct 9, 10:16 AM CDTAreal Flood AdvisoryFWDCollin3 hr
Oct 9, 10:24 AM CDTFlash Flood WarningFWDBell105 min
Oct 9, 10:30 AM CDTAreal Flood AdvisoryFWDHopkins, Rains, Van Zandt2 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.