Alert archive / Oklahoma / Mesoscale Discussions in 2004

Mesoscale Discussion 423

April 21, 20044 states

The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2004, 10:10 PM CDT for 4 states. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued
Apr 21, 2004, 10:10 PM CDT (03:10 UTC)
Expired
Apr 21, 2004, 11:45 PM CDT
In force
95 min
Issued by
the Storm Prediction Center
All 22 counties

Benton County, AR, Washington County, AR, Chautauqua County, KS, Cherokee County, KS, Labette County, KS, Montgomery County, KS, McDonald County, MO, Newton County, MO, Adair County, OK, Cherokee County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Mayes County, OK, Nowata County, OK, Osage County, OK, Ottawa County, OK, Pawnee County, OK, Rogers County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 45 km from the middle of the area, began a volume at 03:13 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.

The watches that followed

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

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 3.2 hours before the alert went out and 135 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, Springfield, MO at 00:00Z on 2004-04-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 91 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, Springfield, MO at 00:00Z on 2004-04-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 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
91 J/kg
Mixed-layer CIN
-91 J/kg
Mixed-layer LCL
1996 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
152 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, 7:01 PM CDTMesoscale DiscussionSPCClay, Craighead, Crittenden, Cross, Greene, Lawrence and 6 more119 min
Apr 21, 8:12 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Baxter, Benton, Boone, Bradley and 52 more63 min
Apr 21, 10:50 PM CDTSevere Thunderstorm WatchSPCCrawford, Sebastian5 hr
Apr 22, 1:43 AM CDTMesoscale DiscussionSPCCrawford, Logan, Sebastian92 min
Apr 22, 12:32 PM CDTMesoscale DiscussionSPCBenton, Washington88 min
Apr 22, 1:40 PM CDTTornado WatchSPCBenton, Boone, Carroll, Crawford, Franklin, Howard and 12 more6 hr
Apr 22, 3:26 PM CDTMesoscale DiscussionSPCCrawford, Franklin, Johnson, Logan, Madison, Newton and 6 more64 min
Apr 22, 5:27 PM CDTMesoscale DiscussionSPCBenton, Boone, Carroll, Crawford, Franklin, Howard and 12 more63 min
Apr 22, 6:23 PM CDTMesoscale DiscussionSPCBoone, Carroll, Crawford, Franklin, Howard, Johnson and 11 more67 min
Apr 21, 7:06 PM CDTMesoscale DiscussionSPCClark, Meade, Seward2 hr
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, 10:56 PM CDTMesoscale DiscussionSPCAlfalfa, Garfield, Grant, Kay, Kingfisher, Logan and 2 more94 min
Apr 22, 4:30 PM CDTTornado WatchSPCBryan, Love6 hr

Nearby

Mesoscale Discussions in Oklahoma, 2004Mesoscale Discussions in Kansas, 2004Mesoscale Discussions in Arkansas, 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; radar from the NEXRAD Level II archive.