Alert archive / Oklahoma / Severe Thunderstorm Watches in 2009

Severe Thunderstorm Watch 402

June 13, 200940 counties in Oklahoma; 11 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Jun 13, 2009, 8:19 PM CDT for 40 counties in Oklahoma; 11 counties in Texas. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
Jun 13, 2009, 8:19 PM CDT (01:19 UTC)
Expired
Jun 14, 2009, 4:00 AM CDT
In force
8 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
70 kt
All 51 counties

Alfalfa County, OK, Atoka County, OK, Blaine County, OK, Bryan County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Grant County, OK, Harper County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Kay County, OK, Kingfisher County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, Major County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Noble County, OK, Oklahoma County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Clay County, TX, Collin County, TX, Cooke County, TX, Denton County, TX, Fannin County, TX, Grayson County, TX, Jack County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Wise County, TX

The radar

The Norman radar (KTLX), 115 km from the middle of the area, began a volume at 01:21 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
20%
One or more EF2 to EF5 tornadoes
10%
Ten or more severe wind reports
90%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
20%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 13, 8:52 PM CDTSevere Thunderstorm WarningOUNCarter, Jefferson, Love53 min
Jun 13, 9:10 PM CDTSevere Thunderstorm WarningOUNCotton65 min
Jun 13, 9:29 PM CDTSevere Thunderstorm WarningOUNBryan, Johnston, Marshall61 min
Jun 13, 9:40 PM CDTSevere Thunderstorm WarningOUNArcher, Clay35 min
Jun 13, 9:43 PM CDTSevere Thunderstorm WarningOUNCarter, Love52 min
Jun 13, 9:52 PM CDTSevere Thunderstorm WarningFWDMontague68 min
Jun 13, 10:44 PM CDTSevere Thunderstorm WarningOUNArcher, Clay61 min
Jun 13, 11:39 PM CDTSevere Thunderstorm WarningOUNClay39 min
Jun 13, 11:47 PM CDTSevere Thunderstorm WarningOUNEllis, Harper, Woodward58 min
Jun 13, 11:50 PM CDTSevere Thunderstorm WarningFWDMontague55 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 00:00Z, 1.3 hours before the alert went out and 105 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, Norman, OK at 00:00Z on 2009-06-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3675 joules per kilogram.LCLLFCEL10008507005003002001001 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, Norman, OK at 00:00Z on 2009-06-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 50 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
3675 J/kg
Mixed-layer CIN
-28 J/kg
Mixed-layer LCL
876 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
50 m²/s²
0-3 km storm-relative helicity
248 m²/s²
Significant tornado parameter
3.9
Supercell composite
18.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 13, 7:46 PM CDTMesoscale DiscussionSPCAlfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 29 more59 min
Jun 13, 10:33 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Creek, Delaware, Haskell, Latimer and 15 more57 min
Jun 13, 11:02 PM CDTSevere Thunderstorm WatchSPCAdair, Cherokee, Choctaw, Craig, Creek, Delaware and 20 more6 hr
Jun 14, 1:05 PM CDTMesoscale DiscussionSPCCimarron, Texas85 min
Jun 14, 4:11 PM CDTTornado WatchSPCBeaver, Ellis, Harper, Texas, Woods, Woodward7 hr
Jun 14, 6:18 PM CDTMesoscale DiscussionSPCBeckham, Comanche, Cotton, Custer, Greer, Harmon and 5 more57 min
Jun 14, 6:50 PM CDTSevere Thunderstorm WatchSPCBeckham, Blaine, Caddo, Comanche, Cotton, Custer and 8 more7 hr
Jun 14, 2:04 PM CDTMesoscale DiscussionSPCAndrews, Armstrong, Bailey, Borden, Briscoe, Castro and 24 more56 min
Jun 14, 2:20 PM CDTSevere Thunderstorm WatchSPCAndrews, Armstrong, Bailey, Borden, Briscoe, Carson and 44 more7 hr
Jun 14, 5:13 PM CDTMesoscale DiscussionSPCAndrews, Armstrong, Bailey, Borden, Briscoe, Carson and 46 more2 hr

Nearby

Severe Thunderstorm Watches in Oklahoma, 2009Severe Thunderstorm Watches in Texas, 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.