Alert archive / Texas / Tornado Watches in 2010

Tornado Watch 77

April 22, 201029 counties in Oklahoma; 41 counties in Texas

The Storm Prediction Center issued this tornado watch at Apr 22, 2010, 8:31 PM CDT for 29 counties in Oklahoma; 41 counties in Texas. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Apr 22, 2010, 8:31 PM CDT (01:31 UTC)
Expired
Apr 23, 2010, 4:00 AM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
60 kt
All 70 counties

Alfalfa County, OK, Beaver County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Grady County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Jackson County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Logan County, OK, Major County, OK, Noble County, OK, Roger Mills County, OK, Tillman County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Andrews County, TX, Archer County, TX, Baylor County, TX, Borden County, TX, Briscoe County, TX, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Crosby County, TX, Dawson County, TX, Dickens County, TX, Donley County, TX, Fisher County, TX, Floyd County, TX, Foard County, TX, Gaines County, TX, Garza County, TX, Hale County, TX, Hall County, TX, Hardeman County, TX, Haskell County, TX, Hemphill County, TX, Howard County, TX, Jones County, TX, Kent County, TX, King County, TX, Knox County, TX, Lipscomb County, TX, Lubbock County, TX, Lynn County, TX, Martin County, TX, Mitchell County, TX, Motley County, TX, Nolan County, TX, Scurry County, TX, Stonewall County, TX, Terry County, TX, Throckmorton County, TX, Wheeler County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 116 km from the middle of the area, began a volume at 01:31 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
40%
Ten or more severe wind reports
90%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
95%
One or more hailstones of 2 inches or more
40%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

19 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Apr 22, 8:44 PM CDTSevere Thunderstorm WarningLUBCrosby, Garza, Lubbock, Lynn61 min
Apr 22, 8:44 PM CDTTornado WarningLUBChildress, Cottle61 min
Apr 22, 9:07 PM CDTSevere Thunderstorm WarningOUNHarmon38 min
Apr 22, 9:15 PM CDTSevere Thunderstorm WarningOUNBeckham, Custer, Dewey, Roger Mills, Washita75 min
Apr 22, 9:18 PM CDTSevere Thunderstorm WarningMAFAndrews, Crane, Dawson, Ector, Gaines, Martin and 3 more57 min
Apr 22, 9:23 PM CDTSevere Thunderstorm WarningLUBLynn22 min
Apr 22, 9:41 PM CDTSevere Thunderstorm WarningLUBCrosby, Dickens, Garza, Kent64 min
Apr 22, 9:43 PM CDTTornado WarningLUBChildress, Cottle32 min
Apr 22, 9:44 PM CDTSevere Thunderstorm WarningOUNHarmon61 min
Apr 22, 9:44 PM CDTSevere Thunderstorm WarningLUBCrosby, Garza, Lubbock, Lynn46 min
Apr 22, 10:30 PM CDTSevere Thunderstorm WarningOUNBlaine, Custer, Dewey60 min
Apr 22, 10:30 PM CDTSevere Thunderstorm WarningLUBCrosby, Dickens, Garza, Kent60 min
Apr 22, 10:40 PM CDTSevere Thunderstorm WarningOUNGreer, Harmon50 min
Apr 22, 10:52 PM CDTSevere Thunderstorm WarningMAFHoward, Martin32 min
Apr 22, 11:28 PM CDTSevere Thunderstorm WarningLUBCottle, Dickens, King47 min
Apr 23, 12:14 AM CDTSevere Thunderstorm WarningOUNHarmon, Jackson46 min
Apr 23, 2:54 AM CDTSevere Thunderstorm WarningOUNAlfalfa, Garfield, Grant, Kay, Kingfisher, Logan and 2 more51 min
Apr 23, 3:05 AM CDTSevere Thunderstorm WarningOUNKingfisher, Lincoln, Logan, Noble, Payne40 min
Apr 23, 3:31 AM CDTSevere Thunderstorm WarningOUNGarfield, Grant, Kay, Lincoln, Logan, Noble and 1 more59 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 00:00Z, 1.5 hours before the alert went out and 162 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.

Skew-T log-pSkew-T log-p diagram, Amarillo Airport, TX at 00:00Z on 2010-04-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Amarillo Airport, TX at 00:00Z on 2010-04-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 23 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1589 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
23 m²/s²
0-3 km storm-relative helicity
57 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.2

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 22, 7:45 PM CDTMesoscale DiscussionSPCBeaver, Beckham, Ellis, Greer, Harmon, Harper and 2 more60 min
Apr 23, 12:00 AM CDTMesoscale DiscussionSPCAlfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 24 more60 min
Apr 23, 2:01 AM CDTMesoscale DiscussionSPCBlaine, Caddo, Canadian, Comanche, Cotton, Garfield and 4 more119 min
Apr 23, 2:50 PM CDTMesoscale DiscussionSPCMcCurtain115 min
Apr 23, 5:41 PM CDTTornado WatchSPCMcCurtain9 hr
Apr 22, 9:17 PM CDTMesoscale DiscussionSPCCoke, Concho, Crane, Crockett, Ector, Edwards and 16 more28 min
Apr 22, 9:32 PM CDTTornado WatchSPCCallahan, Coke, Coleman, Concho, Crane, Crockett and 20 more6 hr
Apr 23, 8:28 AM CDTMesoscale DiscussionSPCBowie, Camp, Cass, Cherokee, Franklin, Gregg and 18 more62 min
Apr 23, 9:53 AM CDTTornado WatchSPCBowie, Camp, Cass, Franklin, Gregg, Harrison and 10 more7 hr
Apr 23, 5:24 PM CDTMesoscale DiscussionSPCAnderson, Bell, Bowie, Brazos, Burleson, Camp and 31 more36 min

Nearby

Tornado Watches in Texas, 2010Tornado Watches in Oklahoma, 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.