Alert archive / Oklahoma / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 102

April 21, 200415 counties in Oklahoma

The Storm Prediction Center issued this severe thunderstorm watch at Apr 21, 2004, 8:35 PM CDT for 15 counties in Oklahoma. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 21, 2004, 8:35 PM CDT (01:35 UTC)
Expired
Apr 22, 2004, 2:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center

Counties Alfalfa County, OK, Blaine County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Grant County, OK, Harper County, OK, Kay County, OK, Kingfisher County, OK, Logan County, OK, Major County, OK, Noble County, OK, Payne County, OK, Woods County, OK, Woodward County, OK

The radar

The Vance AFB radar (KVNX), 54 km from the middle of the area, began a volume at 01:36 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

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

IssuedProductOfficeCountiesLasted
Apr 21, 8:48 PM CDTSevere Thunderstorm WarningOUNDewey42 min
Apr 21, 9:01 PM CDTSevere Thunderstorm WarningOUNMajor, Woodward29 min
Apr 21, 9:03 PM CDTSevere Thunderstorm WarningOUNAlfalfa42 min
Apr 21, 9:13 PM CDTSevere Thunderstorm WarningOUNGrant62 min
Apr 21, 9:16 PM CDTSevere Thunderstorm WarningOUNWoods29 min
Apr 21, 9:27 PM CDTSevere Thunderstorm WarningOUNMajor63 min
Apr 21, 9:43 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Woods47 min
Apr 21, 9:51 PM CDTSevere Thunderstorm WarningOUNBlaine, Dewey39 min
Apr 21, 10:13 PM CDTSevere Thunderstorm WarningOUNGrant47 min
Apr 21, 10:28 PM CDTSevere Thunderstorm WarningOUNBlaine, Garfield, Kingfisher, Major47 min
Apr 21, 11:14 PM CDTSevere Thunderstorm WarningOUNGarfield, Noble46 min
Apr 21, 11:37 PM CDTSevere Thunderstorm WarningOUNLogan, Payne53 min
Apr 21, 11:50 PM CDTSevere Thunderstorm WarningOUNKay, Noble40 min
Apr 22, 12:27 AM CDTSevere Thunderstorm WarningOUNLincoln, Payne48 min
Apr 22, 12:30 AM CDTSevere Thunderstorm WarningOUNKay30 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

Dodge City, (KDDC), launched 00:00Z, 1.6 hours before the alert went out and 171 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, Dodge City, at 00:00Z on 2004-04-22Temperature 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, Dodge City, at 00:00Z on 2004-04-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 71 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1935 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
71 m²/s²
0-3 km storm-relative helicity
320 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 21, 7:06 PM CDTMesoscale DiscussionSPCAlfalfa, Beaver, Blaine, Dewey, Ellis, Harper and 3 more2 hr
Apr 21, 7:51 PM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Choctaw, Cleveland, Creek, Delaware and 18 more84 min
Apr 21, 8:35 PM CDTTornado WatchSPCAtoka, Bryan, Choctaw, Coal, Haskell, Hughes and 6 more5 hr
Apr 21, 10:10 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Craig, Creek, Delaware, Mayes and 8 more95 min
Apr 21, 10:26 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Choctaw, Coal, Haskell, Hughes and 7 more64 min
Apr 21, 10:50 PM CDTSevere Thunderstorm WatchSPCAdair, Cherokee, Craig, Creek, Delaware, Haskell and 14 more5 hr
Apr 21, 10:56 PM CDTMesoscale DiscussionSPCAlfalfa, Garfield, Grant, Kay, Kingfisher, Logan and 2 more94 min
Apr 22, 1:43 AM CDTMesoscale DiscussionSPCAdair, Cherokee, Haskell, McIntosh, Mayes, Muskogee and 7 more92 min
Apr 22, 12:32 PM CDTMesoscale DiscussionSPCAdair, Atoka, Cherokee, Coal, Delaware, Haskell and 15 more88 min
Apr 22, 1:40 PM CDTTornado WatchSPCAdair, Atoka, Bryan, Carter, Cherokee, Choctaw and 33 more6 hr
Apr 22, 3:26 PM CDTMesoscale DiscussionSPCAdair, Atoka, Cherokee, Coal, Haskell, Hughes and 16 more64 min
Apr 22, 4:30 PM CDTTornado WatchSPCBryan, Love6 hr
Apr 22, 5:27 PM CDTMesoscale DiscussionSPCAdair, Atoka, Bryan, Choctaw, Coal, Craig and 23 more63 min
Apr 22, 6:23 PM CDTMesoscale DiscussionSPCAdair, Carter, Garvin, Hughes, LeFlore, McCurtain and 10 more67 min

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.