Alert archive / Texas / Severe Thunderstorm Watches in 2007
Severe Thunderstorm Watch 285
The Storm Prediction Center issued this severe thunderstorm watch at May 21, 2007, 4:06 PM CDT for 17 counties in Kansas; Beaver County, Texas County, Oklahoma; 18 counties in Texas. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- May 21, 2007, 4:06 PM CDT (21:06 UTC)
- Expired
- May 21, 2007, 11:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 37 counties
Clark County, KS, Finney County, KS, Ford County, KS, Grant County, KS, Gray County, KS, Hamilton County, KS, Haskell County, KS, Hodgeman County, KS, Kearny County, KS, Lane County, KS, Meade County, KS, Morton County, KS, Ness County, KS, Scott County, KS, Seward County, KS, Stanton County, KS, Stevens County, KS, Beaver County, OK, Texas County, OK, Armstrong County, TX, Carson County, TX, Collingsworth County, TX, Deaf Smith County, TX, Donley County, TX, Gray County, TX, Hansford County, TX, Hemphill County, TX, Hutchinson County, TX, Lipscomb County, TX, Moore County, TX, Ochiltree County, TX, Oldham County, TX, Potter County, TX, Randall County, TX, Roberts County, TX, Sherman County, TX, Wheeler County, TX
The radar
The Dodge City radar (KDDC), 149 km from the middle of the area, began a volume at 21:08 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
- 5%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 50%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
14 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 4:59 PM CDT | Severe Thunderstorm Warning | AMA | Hansford | 31 min |
| May 21, 5:14 PM CDT | Severe Thunderstorm Warning | AMA | Texas | 61 min |
| May 21, 5:28 PM CDT | Severe Thunderstorm Warning | AMA | Hansford | 36 min |
| May 21, 5:37 PM CDT | Severe Thunderstorm Warning | AMA | Hutchinson | 53 min |
| May 21, 5:56 PM CDT | Severe Thunderstorm Warning | AMA | Ochiltree, Roberts | 64 min |
| May 21, 6:31 PM CDT | Severe Thunderstorm Warning | AMA | Hutchinson | 59 min |
| May 21, 6:35 PM CDT | Severe Thunderstorm Warning | AMA | Deaf Smith, Randall | 55 min |
| May 21, 7:00 PM CDT | Severe Thunderstorm Warning | AMA | Roberts | 60 min |
| May 21, 7:15 PM CDT | Severe Thunderstorm Warning | DDC | Gray | 28 min |
| May 21, 7:30 PM CDT | Severe Thunderstorm Warning | AMA | Hutchinson | 45 min |
| May 21, 7:34 PM CDT | Severe Thunderstorm Warning | AMA | Deaf Smith, Randall | 56 min |
| May 21, 7:46 PM CDT | Severe Thunderstorm Warning | AMA | Carson | 23 min |
| May 21, 8:02 PM CDT | Severe Thunderstorm Warning | AMA | Roberts | 58 min |
| May 21, 8:29 PM CDT | Flash Flood Warning | AMA | Randall | 4 hr |
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, 9.1 hours before the alert went out and 197 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
- 25 J/kg
- Mixed-layer CIN
- -229 J/kg
- Mixed-layer LCL
- 1252 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 17 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 |
|---|---|---|---|---|
| May 21, 3:55 PM CDT | Mesoscale Discussion | SPC | Finney, Grant, Gray, Hamilton, Haskell, Kearny and 8 more | 65 min |
| May 21, 6:03 PM CDT | Mesoscale Discussion | SPC | Barber, Clark, Comanche, Meade | 87 min |
| May 21, 6:35 PM CDT | Severe Thunderstorm Watch | SPC | Alfalfa, Beckham, Blaine, Custer, Dewey, Ellis and 9 more | 6 hr |
| May 21, 2:17 PM CDT | Mesoscale Discussion | SPC | Anderson, Austin, Bell, Bosque, Brazoria, Brazos and 35 more | 58 min |
| May 21, 2:51 PM CDT | Mesoscale Discussion | SPC | Brewster, Crane, Crockett, Ector, Irion, Midland and 9 more | 84 min |
| May 21, 3:17 PM CDT | Severe Thunderstorm Watch | SPC | Brewster, Crane, Crockett, Edwards, Jeff Davis, Kinney and 9 more | 8 hr |
Nearby
Severe Thunderstorm Watches in Texas, 2007Severe Thunderstorm Watches in Kansas, 2007Severe Thunderstorm Watches in Oklahoma, 2007Every severe thunderstorm watch in 2007
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.