Alert archive / Oklahoma / Tornado Watches in 2010
Tornado Watch 151
The Storm Prediction Center issued this tornado watch at May 11, 2010, 3:47 PM CDT for 18 counties in Oklahoma; 5 counties in Texas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- May 11, 2010, 3:47 PM CDT (20:47 UTC)
- Expired
- May 11, 2010, 9:37 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 3 in
- Strongest gust expected
- 60 kt
All 23 counties
Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Grady County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Jefferson County, OK, Kiowa County, OK, Roger Mills County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Clay County, TX, Foard County, TX, Hardeman County, TX, Wichita County, TX, Wilbarger County, TX
The radar
The Altus AFB radar (KFDR), 94 km from the middle of the area, began a volume at 20:54 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
- 50%
- One or more EF2 to EF5 tornadoes
- 30%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 80%
- One or more hailstones of 2 inches or more
- 40%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 5:52 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Custer, Washita | 24 min |
| May 11, 7:47 PM CDT | Severe Thunderstorm Warning | OUN | Dewey, Ellis, Woodward | 58 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
Norman, OK (KOUN), launched 12:00Z, 8.8 hours before the alert went out and 119 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
- 748 J/kg
- Mixed-layer CIN
- -314 J/kg
- Mixed-layer LCL
- 744 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 179 m²/s²
- 0-3 km storm-relative helicity
- 189 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 10.9
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 9:21 PM CDT | Mesoscale Discussion | SPC | Atoka, Carter, Cherokee, Coal, Craig, Creek and 26 more | 54 min |
| May 10, 9:51 PM CDT | Mesoscale Discussion | SPC | Bryan, Choctaw, LeFlore, McCurtain, Pushmataha | 54 min |
| May 11, 3:23 PM CDT | Mesoscale Discussion | SPC | Blaine, Caddo, Canadian, Cleveland, Comanche, Cotton and 12 more | 67 min |
| May 11, 6:10 PM CDT | Mesoscale Discussion | SPC | Beckham, Blaine, Caddo, Canadian, Comanche, Cotton and 12 more | 95 min |
| May 10, 7:34 PM CDT | Mesoscale Discussion | SPC | Archer, Callahan, Eastland, Jack, Jones, Palo Pinto and 5 more | 56 min |
Nearby
Tornado Watches in Oklahoma, 2010Tornado Watches in Texas, 2010Every tornado watch in 2010
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.