Alert archive / Texas / Severe Thunderstorm Watches in 2009
Severe Thunderstorm Watch 556
The Storm Prediction Center issued this severe thunderstorm watch at Jul 6, 2009, 5:21 PM CDT for Beaver County, Cimarron County, Texas County, Oklahoma; 40 counties in Texas. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 6, 2009, 5:21 PM CDT (22:21 UTC)
- Expired
- Jul 7, 2009, 1:00 AM CDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 43 counties
Beaver County, OK, Cimarron County, OK, Texas County, OK, Armstrong County, TX, Bailey County, TX, Briscoe County, TX, Carson County, TX, Castro County, TX, Cochran County, TX, Collingsworth County, TX, Crosby County, TX, Dallam County, TX, Deaf Smith County, TX, Dickens County, TX, Donley County, TX, Floyd County, TX, Garza County, TX, Gray County, TX, Hale County, TX, Hall County, TX, Hansford County, TX, Hartley County, TX, Hemphill County, TX, Hockley County, TX, Hutchinson County, TX, Kent County, TX, Lamb County, TX, Lipscomb County, TX, Lubbock County, TX, Lynn County, TX, Moore County, TX, Motley County, TX, Ochiltree County, TX, Oldham County, TX, Parmer County, TX, Potter County, TX, Randall County, TX, Roberts County, TX, Sherman County, TX, Swisher County, TX, Terry County, TX, Wheeler County, TX, Yoakum County, TX
The radar
The Amarillo radar (KAMA), 44 km from the middle of the area, began a volume at 22:21 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 8:26 PM CDT | Severe Thunderstorm Warning | AMA | Cimarron, Texas | 64 min |
| Jul 6, 9:29 PM CDT | Severe Thunderstorm Warning | AMA | Texas | 61 min |
| Jul 6, 10:13 PM CDT | Severe Thunderstorm Warning | LUB | Hale, Hockley, Lamb | 47 min |
| Jul 6, 10:18 PM CDT | Severe Thunderstorm Warning | AMA | Armstrong | 57 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Amarillo Airport, TX (KAMA), launched 12:00Z, 10.4 hours before the alert went out and 45 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
- 352 J/kg
- Mixed-layer CIN
- -26 J/kg
- Mixed-layer LCL
- 595 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 74 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 5:08 PM CDT | Mesoscale Discussion | SPC | Cimarron, Texas | 37 min |
| Jul 6, 5:19 PM CDT | Mesoscale Discussion | SPC | Cimarron | 56 min |
| Jul 5, 7:15 PM CDT | Mesoscale Discussion | SPC | Bailey, Cochran, Dallam, Deaf Smith, Hartley, Oldham and 1 more | 60 min |
| Jul 5, 7:22 PM CDT | Mesoscale Discussion | SPC | Angelina, Cherokee, Harrison, Marion, Nacogdoches, Panola and 4 more | 53 min |
| Jul 5, 9:12 PM CDT | Mesoscale Discussion | SPC | Jasper, Newton, Polk, Sabine, Tyler | 33 min |
Nearby
Severe Thunderstorm Watches in Texas, 2009Severe Thunderstorm Watches in Oklahoma, 2009Every severe thunderstorm watch 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.