Alert archive / Oklahoma / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 507

June 21, 200411 counties in Oklahoma

The Storm Prediction Center issued this severe thunderstorm watch at Jun 21, 2004, 10:25 PM CDT for 11 counties in Oklahoma. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jun 21, 2004, 10:25 PM CDT (03:25 UTC)
Expired
Jun 22, 2004, 3:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center

Counties Blaine County, OK, Canadian County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Kingfisher County, OK, Logan County, OK, Major County, OK, Noble County, OK, Roger Mills County, OK, Washita County, OK

The radar

The Vance AFB radar (KVNX), 103 km from the middle of the area, began a volume at 03:28 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.

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 21, 11:01 PM CDTSevere Thunderstorm WarningOUNWashita44 min
Jun 22, 1:02 AM CDTSevere Thunderstorm WarningOUNCanadian, Kingfisher, Oklahoma43 min
Jun 22, 1:55 AM CDTFlash Flood WarningOUNCanadian, Cleveland, Grady, McClain, Oklahoma3 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

Lamont, OK (KLMN), launched 00:00Z, 3.4 hours before the alert went out and 136 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, Lamont, OK at 00:00Z on 2004-06-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 241 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, Lamont, OK at 00:00Z on 2004-06-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -11 square meters per square second.1939587897Sfc1 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
241 J/kg
Mixed-layer CIN
-38 J/kg
Mixed-layer LCL
1538 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
-11 m²/s²
0-3 km storm-relative helicity
81 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 21, 7:52 PM CDTMesoscale DiscussionSPCAlfalfa, Craig, Creek, Delaware, Garfield, Grant and 16 more83 min
Jun 21, 8:05 PM CDTSevere Thunderstorm WatchSPCBeckham, Greer, Harmon, Jackson7 hr
Jun 21, 10:17 PM CDTMesoscale DiscussionSPCBeckham, Blaine, Caddo, Canadian, Custer, Dewey and 9 more88 min
Jun 21, 11:27 PM CDTMesoscale DiscussionSPCBlaine, Canadian, Carter, Cotton, Custer, Dewey and 10 more93 min
Jun 21, 11:44 PM CDTMesoscale DiscussionSPCBeckham, Greer, Harmon, Jackson91 min
Jun 22, 2:48 AM CDTMesoscale DiscussionSPCComanche, Cotton, Tillman27 min
Jun 22, 4:05 AM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Coal, Haskell, Hughes and 10 more2 hr

Nearby

Severe Thunderstorm Watches in Oklahoma, 2004Every severe thunderstorm watch in 2004

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.