Alert archive / Oklahoma / Mesoscale Discussions in 2004

Mesoscale Discussion 420

April 21, 2004Clark County, Meade County, Seward County, Kansas; 9 counties in Oklahoma; Lipscomb County, Ochiltree County, Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2004, 7:06 PM CDT for Clark County, Meade County, Seward County, Kansas; 9 counties in Oklahoma; Lipscomb County, Ochiltree County, Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 21, 2004, 7:06 PM CDT (00:06 UTC)
Expired
Apr 21, 2004, 9:30 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center

Counties Clark County, KS, Meade County, KS, Seward County, KS, Alfalfa County, OK, Beaver County, OK, Blaine County, OK, Dewey County, OK, Ellis County, OK, Harper County, OK, Major County, OK, Woods County, OK, Woodward County, OK, Lipscomb County, TX, Ochiltree County, TX

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Dodge City, (KDDC), launched 00:00Z, 0.1 hours before the alert went out and 134 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

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 21, 10:10 PM CDTMesoscale DiscussionSPCChautauqua, Cherokee, Labette, Montgomery95 min
Apr 21, 7:51 PM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Choctaw, Cleveland, Creek, Delaware and 18 more84 min
Apr 21, 8:35 PM CDTSevere Thunderstorm WatchSPCAlfalfa, Blaine, Dewey, Ellis, Garfield, Grant and 9 more5 hr
Apr 21, 8:35 PM CDTTornado WatchSPCAtoka, Bryan, Choctaw, Coal, Haskell, Hughes and 6 more5 hr
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
Apr 22, 3:15 PM CDTMesoscale DiscussionSPCCollin, Cooke, Dallas, Denton, Fannin, Grayson and 8 more3 hr

Nearby

Mesoscale Discussions in Oklahoma, 2004Mesoscale Discussions in Kansas, 2004Mesoscale Discussions in Texas, 2004Every mesoscale discussion 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.