Alert archive / Oklahoma / Mesoscale Discussions in 2004

Mesoscale Discussion 455

April 23, 20044 states

The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2004, 6:01 PM CDT for 4 states. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Apr 23, 2004, 6:01 PM CDT (23:01 UTC)
Expired: Apr 23, 2004, 7:00 PM CDT
In force: 59 min
Issued by: the Storm Prediction Center

All 37 counties

Crawford County, AR, Scott County, AR, Sebastian County, AR, Allen County, KS, Bourbon County, KS, Butler County, KS, Chautauqua County, KS, Crawford County, KS, Elk County, KS, Greenwood County, KS, Harper County, KS, Labette County, KS, Montgomery County, KS, Neosho County, KS, Sedgwick County, KS, Wilson County, KS, Woodson County, KS, Barton County, MO, Cedar County, MO, Polk County, MO, St. Clair County, MO, Vernon County, MO, Creek County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, Lincoln County, OK, Nowata County, OK, Okfuskee County, OK, Osage County, OK, Pawnee County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Tulsa County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 42 km from the middle of the area, began a volume at 23:02 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.

Severe Thunderstorm Watch 114Apr 23, 7:35 PM CDT

The nearest sounding before it

Lamont, OK (KLMN), launched 12:00Z, 11.0 hours before the alert went out and 137 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 3 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 499 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 102 m²/s²
0-3 km storm-relative helicity: 268 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.1

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.

Issued	Product	Office	Counties	Lasted
Apr 22, 7:10 PM CDT	Mesoscale Discussion	SPC	Boone, Franklin, Howard, Johnson, Logan, Madison and 5 more	35 min
Apr 22, 7:50 PM CDT	Tornado Watch	SPC	Baxter, Benton, Boone, Carroll, Crawford, Franklin and 10 more	4 hr
Apr 22, 9:50 PM CDT	Severe Thunderstorm Watch	SPC	Baxter, Benton, Boone, Carroll, Cleburne, Conway and 25 more	6 hr
Apr 22, 10:52 PM CDT	Mesoscale Discussion	SPC	Conway, Pope, Searcy, Stone, Van Buren	53 min
Apr 22, 11:25 PM CDT	Mesoscale Discussion	SPC	Clay, Craighead, Crittenden, Cross, Greene, Mississippi and 1 more	65 min
Apr 22, 11:40 PM CDT	Severe Thunderstorm Watch	SPC	Clay, Craighead, Crittenden, Cross, Greene, Lawrence and 4 more	6 hr
Apr 23, 12:54 AM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Cleburne, Conway and 25 more	96 min
Apr 23, 3:12 AM CDT	Mesoscale Discussion	SPC	Clay, Craighead, Crittenden, Cross, Greene, Lawrence and 5 more	93 min
Apr 23, 7:33 AM CDT	Mesoscale Discussion	SPC	Craighead, Crittenden, Cross, Jackson, Lee, Poinsett and 2 more	87 min
Apr 23, 10:37 AM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Fulton, Izard and 3 more	113 min
Apr 23, 2:10 PM CDT	Severe Thunderstorm Watch	SPC	Benton, Crawford, Sebastian, Washington	6 hr
Apr 23, 10:10 AM CDT	Mesoscale Discussion	SPC	Clark, Comanche, Ford, Gray, Meade, Seward	3 hr
Apr 23, 12:51 PM CDT	Mesoscale Discussion	SPC	Allen, Anderson, Bourbon, Cherokee, Crawford, Labette and 5 more	114 min
Apr 23, 3:05 PM CDT	Severe Thunderstorm Watch	SPC	Allen, Bourbon, Butler, Chautauqua, Cherokee, Cowley and 12 more	5 hr
Apr 22, 8:00 PM CDT	Mesoscale Discussion	SPC	Love	60 min
Apr 22, 11:47 PM CDT	Mesoscale Discussion	SPC	Beaver, Custer, Dewey, Ellis, Harper, Major and 3 more	58 min
Apr 23, 12:15 PM CDT	Tornado Watch	SPC	Carter, Cotton, Jefferson, Tillman	6 hr
Apr 23, 1:46 PM CDT	Mesoscale Discussion	SPC	Adair, Caddo, Canadian, Carter, Cherokee, Cleveland and 29 more	119 min
Apr 23, 3:05 PM CDT	Mesoscale Discussion	SPC	Cotton, Garvin, Murray, Pontotoc, Stephens	85 min
Apr 23, 4:40 PM CDT	Mesoscale Discussion	SPC	Carter, Jefferson	65 min
Apr 23, 5:30 PM CDT	Severe Thunderstorm Watch	SPC	Carter, Cotton, Jefferson, Johnston, Love, Marshall and 3 more	7 hr

Nearby

Mesoscale Discussions in Oklahoma, 2004 Mesoscale Discussions in Kansas, 2004 Mesoscale Discussions in Missouri, 2004 Every 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.