Alert archive / Texas / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 494, NWS Fort Worth, TX
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.
- 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
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 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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</html>The office that day
Everything else NWS Fort Worth, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 8, 10:13 PM CDT | Special Weather Statement | FWD | Stephens, Young | 32 min |
| Oct 8, 10:30 PM CDT | Special Weather Statement | FWD | Jack, Palo Pinto | 30 min |
| Oct 8, 11:10 PM CDT | Special Weather Statement | FWD | Parker | 35 min |
| Oct 8, 11:57 PM CDT | Special Weather Statement | FWD | Young | 33 min |
| Oct 9, 3:05 AM CDT | Areal Flood Advisory | FWD | Denton | 85 min |
| Oct 9, 3:22 AM CDT | Areal Flood Advisory | FWD | Johnson, Tarrant | 113 min |
| Oct 9, 3:36 AM CDT | Areal Flood Advisory | FWD | Fannin | 3 hr |
| Oct 9, 3:41 AM CDT | Areal Flood Advisory | FWD | Dallas | 3 hr |
| Oct 9, 3:56 AM CDT | River Flood Warning | FWD | Dallas | 7 hr |
| Oct 9, 4:05 AM CDT | Special Weather Statement | FWD | Ellis, Navarro | 25 min |
| Oct 9, 4:11 AM CDT | River Flood Warning | FWD | Denton | 16 hr |
| Oct 9, 4:22 AM CDT | Special Weather Statement | FWD | Bell, McLennan | 23 min |
| Oct 9, 4:29 AM CDT | River Flood Warning | FWD | Dallas | 6 hr |
| Oct 9, 4:43 AM CDT | Special Weather Statement | FWD | Henderson, Kaufman, Rains, Van Zandt | 92 min |
| Oct 9, 4:49 AM CDT | Special Weather Statement | FWD | Ellis, Hill, Navarro | 26 min |
| Oct 9, 4:55 AM CDT | Special Weather Statement | FWD | Falls, Limestone | 35 min |
| Oct 9, 5:16 AM CDT | Special Weather Statement | FWD | Milam | 59 min |
| Oct 9, 5:17 AM CDT | Areal Flood Advisory | FWD | Hill | 118 min |
| Oct 9, 5:25 AM CDT | River Flood Warning | FWD | Collin | 34 hr |
| Oct 9, 5:26 AM CDT | Special Weather Statement | FWD | Anderson, Freestone | 64 min |
| Oct 9, 5:34 AM CDT | Special Weather Statement | FWD | Leon, Robertson | 56 min |
| Oct 9, 6:07 AM CDT | River Flood Warning | FWD | Dallas | 51 hr |
| Oct 9, 6:15 AM CDT | River Flood Warning | FWD | Hunt | 33 hr |
| Oct 9, 8:29 AM CDT | River Flood Warning | FWD | Hunt, Rockwall | 35 hr |
| Oct 9, 8:56 AM CDT | River Flood Warning | FWD | Collin | 25 hr |
| Oct 9, 9:53 AM CDT | River Flood Warning | FWD | Delta, Lamar | 3 hr |
| Oct 9, 9:53 AM CDT | River Flood Warning | FWD | Delta, Hopkins | 11 hr |
| Oct 9, 10:08 AM CDT | Areal Flood Advisory | FWD | Bell, Coryell, Falls, McLennan | 2 hr |
| Oct 9, 10:16 AM CDT | Areal Flood Advisory | FWD | Collin | 3 hr |
| Oct 9, 10:24 AM CDT | Flash Flood Warning | FWD | Bell | 105 min |
| Oct 9, 10:30 AM CDT | Areal Flood Advisory | FWD | Hopkins, Rains, Van Zandt | 2 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.