Alert archive / Oklahoma / Tornado Watches in 2008

Tornado Watch 169

April 7, 200828 counties in Oklahoma; 6 counties in Texas

The Storm Prediction Center issued this tornado watch at Apr 7, 2008, 3:02 PM CDT for 28 counties in Oklahoma; 6 counties in Texas. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Apr 7, 2008, 3:02 PM CDT (20:02 UTC)
Expired
Apr 7, 2008, 10:00 PM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Particularly dangerous situation
Yes
Largest hail expected
4 in
Strongest gust expected
70 kt
All 34 counties

Blaine County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Garvin County, OK, Grady County, OK, Jackson County, OK, Jefferson County, OK, Johnston County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Oklahoma County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Montague County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 63 km from the middle of the area, began a volume at 20:02 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
90%
One or more EF2 to EF5 tornadoes
50%
Ten or more severe wind reports
60%
One or more gusts of 65 knots or more
60%
Ten or more severe hail reports
90%
One or more hailstones of 2 inches or more
70%
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 7, 3:28 PM CDTSevere Thunderstorm WarningOUNWichita, Wilbarger32 min
Apr 7, 3:55 PM CDTSevere Thunderstorm WarningOUNWilbarger50 min
Apr 7, 3:59 PM CDTSevere Thunderstorm WarningOUNTillman31 min
Apr 7, 4:33 PM CDTTornado WarningOUNWichita, Wilbarger27 min
Apr 7, 5:00 PM CDTTornado WarningOUNWichita, Wilbarger30 min
Apr 7, 5:27 PM CDTTornado WarningOUNWichita33 min
Apr 7, 6:01 PM CDTSevere Thunderstorm WarningOUNCotton44 min
Apr 7, 6:59 PM CDTSevere Thunderstorm WarningOUNArcher, Baylor, Wichita, Wilbarger46 min
Apr 7, 7:02 PM CDTSevere Thunderstorm WarningOUNArcher, Baylor43 min
Apr 7, 7:25 PM CDTSevere Thunderstorm WarningOUNArcher, Wichita50 min
Apr 7, 7:27 PM CDTSevere Thunderstorm WarningOUNCotton, Tillman44 min
Apr 7, 7:46 PM CDTSevere Thunderstorm WarningOUNArcher, Clay44 min
Apr 7, 7:47 PM CDTSevere Thunderstorm WarningOUNKingfisher, Logan43 min
Apr 7, 7:56 PM CDTSevere Thunderstorm WarningOUNLincoln, Logan, Payne49 min
Apr 7, 7:57 PM CDTSevere Thunderstorm WarningOUNComanche, Cotton33 min
Apr 7, 8:14 PM CDTSevere Thunderstorm WarningOUNLogan, Payne46 min
Apr 7, 8:18 PM CDTSevere Thunderstorm WarningOUNStephens42 min
Apr 7, 8:28 PM CDTSevere Thunderstorm WarningOUNArcher, Clay62 min
Apr 7, 8:46 PM CDTSevere Thunderstorm WarningOUNGarvin, Grady, Stephens25 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

Fort Sill, OK (KFSI), launched 12:00Z, 8.0 hours before the alert went out and 36 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, Fort Sill, OK at 12:00Z on 2008-04-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 10 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Sill, OK at 12:00Z on 2008-04-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 9 square meters per square second.1939Sfc1 km3 km6 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
10 J/kg
Mixed-layer CIN
-463 J/kg
Mixed-layer LCL
1302 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
9 m²/s²
0-3 km storm-relative helicity
106 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 7, 2:05 PM CDTMesoscale DiscussionSPCCaddo, Comanche, Cotton, Grady, Kiowa, Stephens and 2 more85 min
Apr 7, 4:52 PM CDTMesoscale DiscussionSPCCaddo, Comanche, Cotton, Grady, Jackson, Kiowa and 3 more83 min
Apr 7, 6:52 PM CDTMesoscale DiscussionSPCBlaine, Caddo, Canadian, Carter, Cleveland, Coal and 36 more113 min
Apr 7, 2:46 PM CDTMesoscale DiscussionSPCCallahan, Coleman, Runnels, Shackelford, Stephens, Taylor and 2 more89 min

Nearby

Tornado Watches in Oklahoma, 2008Tornado Watches in Texas, 2008Every tornado watch in 2008

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.