Alert archive / Texas / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 281, NWS Amarillo, TX
NWS Amarillo, TX issued this severe thunderstorm warning at Aug 18, 2009, 8:12 PM CDT for 4 counties in Texas. It was in force for 63 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 18, 2009, 8:12 PM CDT (01:12 UTC)
- Expired
- Aug 18, 2009, 9:15 PM CDT
- In force
- 63 min
- Issued by
- NWS Amarillo, TX
- Area
- Storm-based polygon
Counties Dallam County, TX, Moore County, TX, Potter County, TX, Sherman County, TX
The radar
The Amarillo radar (KAMA), 86 km from the middle of the area, began a volume at 01:14 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 18, 5:00 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Dodge City, (KDDC), launched 00:00Z, 1.2 hours before the alert went out and 280 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
- 1096 J/kg
- Mixed-layer CIN
- -39 J/kg
- Mixed-layer LCL
- 1442 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 23 m²/s²
- 0-3 km storm-relative helicity
- 115 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 2.0
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 Amarillo, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 18, 6:40 PM CDT, 1 hour 32 minutes earlier.
Area forecast discussion, Aug 18, 6:40 PM CDT, 1 hour 32 minutes before
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</html>Hazardous weather outlook, Aug 18, 5:08 PM CDT, 3 hours 4 minutes before
TEXAS/OKLAHOMA PANHANDLES HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE AMARILLO TX 508 PM CDT TUE AUG 18 2009 OKZ001>003-TXZ001>020-191100- ARMSTRONG-BEAVER-CARSON-CIMARRON-COLLINGSWORTH-DALLAM-DEAF SMITH- DONLEY-GRAY-HANSFORD-HARTLEY-HEMPHILL-HUTCHINSON-LIPSCOMB-MOORE- OCHILTREE-OLDHAM-POTTER-RANDALL-ROBERTS-SHERMAN-TEXAS-WHEELER- 508 PM CDT TUE AUG 18 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE TEXAS AND OKLAHOMA PANHANDLES. .DAY ONE... THUNDERSTORMS ARE EXPECTED ACROSS ALL OF THE TEXAS AND OKLAHOMA PANHANDLES THROUGH TONIGHT WITH SOME THUNDERSTORMS LIKELY BECOMING SEVERE. THE PRIMARY THREATS WILL BE LARGE HAIL AND DAMAGING WINDS... ALTHOUGH A FEW TORNADOES WILL BE POSSIBLE GIVEN THE STRONGLY SHEARED ENVIRONMENT. THEREFORE...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR THE OKLAHOMA PANHANDLE AND ALL BUT THE EXTREME EASTERN TEXAS PANHANDLE UNTIL MIDNIGHT. HEAVY RAINFALL WILL ALSO BE POSSIBLE WITH THESE THUNDERSTORMS. WITH MANY AREAS HAVING EXPERIENCED LOCALLY HEAVY RAINFALL OVER THE PAST FEW DAYS...THE THREAT FOR FLASH FLOODING WILL EXIST. A FLASH FLOOD WATCH IS IN EFFECT FOR ALL BUT THE FAR WESTERN THIRD OF THE TEXAS AND OKLAHOMA PANHANDLES UNTIL WEDNESDAY MORNING. .DAYS TWO THROUGH SEVEN... THUNDERSTORMS WILL BE POSSIBLE ACROSS MUCH OF THE TEXAS AND OKLAHOMA PANHANDLES THROUGH WEDNESDAY NIGHT. HEAVY RAINFALL WILL BE POSSIBLE WITH THE STRONGEST STORMS...WHICH MAY LEAD TO LOCALIZED FLOODING OR FLASH FLOODING. .SPOTTER INFORMATION STATEMENT... SPOTTERS AND EMERGENCY MANAGEMENT GROUPS SHOULD PREPARE FOR SEVERE WEATHER OPERATIONS. SPOTTERS AND RAINFALL OBSERVERS ARE REQUESTED TO RELAY THEIR SEVERE WEATHER INFORMATION AND RAINFALL REPORTS TO THE NATIONAL WEATHER SERVICE IN AMARILLO. JOHNSON
In the hours before
Local storm report, Aug 18, 6:53 PM CDT, 1 hour 19 minutes before
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</html>The office that day
Everything else NWS Amarillo, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 7:09 PM CDT | Severe Thunderstorm Warning | AMA | Deaf Smith | 66 min |
| Aug 18, 7:25 PM CDT | Severe Thunderstorm Warning | AMA | Deaf Smith, Oldham | 65 min |
| Aug 18, 7:32 PM CDT | Severe Thunderstorm Warning | AMA | Hartley, Moore, Oldham, Potter | 43 min |
| Aug 18, 7:47 PM CDT | Severe Thunderstorm Warning | AMA | Deaf Smith | 58 min |
| Aug 18, 8:03 PM CDT | Severe Thunderstorm Warning | AMA | Potter, Randall | 57 min |
| Aug 18, 8:17 PM CDT | Areal Flood Advisory | AMA | Potter, Randall | 3 hr |
| Aug 18, 8:53 PM CDT | Severe Thunderstorm Warning | AMA | Hansford, Hutchinson, Ochiltree, Roberts | 67 min |
| Aug 18, 9:49 PM CDT | Severe Thunderstorm Warning | AMA | Armstrong, Carson, Donley, Gray, Roberts | 56 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.