Alert archive / Texas / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 422, NWS Fort Worth, TX
NWS Fort Worth, TX issued this severe thunderstorm warning at Aug 20, 2009, 9:34 PM CDT for Lamar County, Texas. It was in force for 41 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
- Aug 20, 2009, 9:34 PM CDT (02:34 UTC)
- Expired
- Aug 20, 2009, 10:15 PM CDT
- In force
- 41 min
- Issued by
- NWS Fort Worth, TX
- Area
- Storm-based polygon
County Lamar County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 202 km from the middle of the area, began a volume at 02:34 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.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 20, 3:08 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Fort Worth, TX (KFWD), launched 00:00Z, 2.6 hours before the alert went out and 185 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
- 2085 J/kg
- Mixed-layer CIN
- -48 J/kg
- Mixed-layer LCL
- 2065 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 44 m²/s²
- 0-3 km storm-relative helicity
- 120 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.6
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 Aug 20, 8:30 PM CDT, 1 hour 4 minutes earlier.
Area forecast discussion, Aug 20, 8:30 PM CDT, 1 hour 4 minutes before
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</html>Hazardous weather outlook, Aug 20, 8:38 PM CDT, 56 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE FORT WORTH TX 838 PM CDT THU AUG 20 2009 TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-211200- 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- 838 PM CDT THU AUG 20 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH TEXAS. .DAY ONE...TONIGHT. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS EAST OF A SHERMAN... DALLAS...HILLSBORO...FAIRFIELD AND PALESTINE LINE OVERNIGHT. DAMAGING WINDS...LARGE HAIL...BRIEF HEAVY RAINFALL...AND POSSIBLY A BRIEF TORNADO WILL BE THE MAIN THREATS...AS SCATTERED STORMS MOVE THROUGH THE SLIGHT RISK AREA. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. THUNDERSTORMS REMAIN POSSIBLE FRIDAY SOUTHEAST OF A TEMPLE...CORSICANA... SULPHUR SPRINGS LINE. CLOUD TO GROUND LIGHTNING AND BRIEF HEAVY RAIN MAY ACCOMPANY THE STORMS. .SPOTTER INFORMATION STATEMENT... LIMITED SPOTTER ACTIVATION MAY BE REQUESTED ACROSS EASTERN NORTH TEXAS. 05/
The office that day
Everything else NWS Fort Worth, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 10:29 PM CDT | Special Weather Statement | FWD | Lamar | 31 min |
| Aug 20, 10:37 PM CDT | Areal Flood Advisory | FWD | Lamar | 113 min |
| Aug 20, 10:49 PM CDT | Severe Thunderstorm Warning | FWD | Lamar | 56 min |
| Aug 20, 10:51 PM CDT | Flash Flood Warning | FWD | Lamar | 114 min |
| Aug 20, 11:35 PM CDT | Areal Flood Advisory | FWD | Fannin | 115 min |
| Aug 20, 11:48 PM CDT | Special Weather Statement | FWD | Delta, Fannin, Lamar | 27 min |
| Aug 21, 12:47 AM CDT | Flash Flood Warning | FWD | Fannin, Lamar | 4 hr |
| Aug 21, 12:57 AM CDT | Severe Thunderstorm Warning | FWD | Fannin | 36 min |
| Aug 21, 2:36 AM CDT | Special Weather Statement | FWD | Dallas | 24 min |
| Aug 21, 2:55 AM CDT | Severe Thunderstorm Warning | FWD | Hopkins, Hunt, Rains | 36 min |
| Aug 21, 3:46 AM CDT | Special Weather Statement | FWD | Van Zandt | 29 min |
| Aug 21, 5:07 AM CDT | Special Weather Statement | FWD | Henderson | 23 min |
| Aug 21, 5:46 AM CDT | Special Weather Statement | FWD | Navarro | 29 min |
| Aug 21, 5:59 AM CDT | Severe Thunderstorm Warning | FWD | Henderson, Navarro | 42 min |
| Aug 21, 6:16 AM CDT | Special Weather Statement | FWD | Ellis | 29 min |
| Aug 21, 6:41 AM CDT | Areal Flood Advisory | FWD | Dallas, Tarrant | 109 min |
| Aug 21, 6:42 AM CDT | Special Weather Statement | FWD | Ellis | 33 min |
| Aug 21, 6:44 AM CDT | Special Weather Statement | FWD | Tarrant | 31 min |
| Aug 21, 6:59 AM CDT | Special Weather Statement | FWD | Navarro | 31 min |
| Aug 21, 7:11 AM CDT | Special Weather Statement | FWD | Dallas | 34 min |
| Aug 21, 7:29 AM CDT | Special Weather Statement | FWD | Navarro | 31 min |
| Aug 21, 7:37 AM CDT | River Flood Warning | FWD | Dallas | 3 hr |
| Aug 21, 8:32 AM CDT | Special Weather Statement | FWD | Palo Pinto | 28 min |
| Aug 21, 8:45 AM CDT | Severe Thunderstorm Warning | FWD | Palo Pinto | 45 min |
| Aug 21, 8:54 AM CDT | Special Weather Statement | FWD | Parker | 36 min |
| Aug 21, 8:58 AM CDT | Severe Thunderstorm Warning | FWD | Hood, Johnson, Parker | 47 min |
| Aug 21, 9:26 AM CDT | Severe Thunderstorm Warning | FWD | Erath, Palo Pinto | 64 min |
| Aug 21, 10:49 AM CDT | Special Weather Statement | FWD | Eastland | 26 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.