Alert archive / Oklahoma / Mesoscale Discussions in 2004

Mesoscale Discussion 501

April 29, 200415 counties in Oklahoma; 13 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2004, 6:35 PM CDT for 15 counties in Oklahoma; 13 counties in Texas. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Apr 29, 2004, 6:35 PM CDT (23:35 UTC)
Expired: Apr 29, 2004, 8:00 PM CDT
In force: 85 min
Issued by: the Storm Prediction Center

All 28 counties

Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Custer County, OK, Dewey County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kiowa County, OK, Major County, OK, Roger Mills County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Crosby County, TX, Dickens County, TX, Foard County, TX, Garza County, TX, Hall County, TX, Hardeman County, TX, Kent County, TX, King County, TX, Motley County, TX, Stonewall County, TX

The radar

The Altus AFB radar (KFDR), 134 km from the middle of the area, began a volume at 23:38 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 nearest sounding before it

Fort Sill, OK (KFSI), launched 12:00Z, 11.6 hours before the alert went out and 138 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 695 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 213 m²/s²
0-3 km storm-relative helicity: 324 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.

Issued	Product	Office	Counties	Lasted
Apr 29, 1:49 PM CDT	Mesoscale Discussion	SPC	Beckham, Greer, Harmon, Jackson, Tillman	116 min
Apr 29, 3:05 PM CDT	Severe Thunderstorm Watch	SPC	Alfalfa, Beckham, Blaine, Custer, Dewey, Grant and 9 more	7 hr
Apr 29, 5:10 PM CDT	Mesoscale Discussion	SPC	Caddo, Canadian, Carter, Cleveland, Comanche, Cotton and 13 more	95 min
Apr 29, 5:35 PM CDT	Severe Thunderstorm Watch	SPC	Caddo, Canadian, Cleveland, Comanche, Cotton, Grady and 10 more	5 hr
Apr 28, 7:07 PM CDT	Mesoscale Discussion	SPC	Bandera, Dimmit, Edwards, Frio, Kerr, Kinney and 8 more	83 min
Apr 28, 7:25 PM CDT	Severe Thunderstorm Watch	SPC	Bandera, Brooks, Crockett, Dimmit, Duval, Edwards and 17 more	6 hr
Apr 28, 9:56 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Brooks, Dimmit, Duval, Edwards and 12 more	94 min
Apr 29, 4:12 AM CDT	Mesoscale Discussion	SPC	Austin, Bastrop, Brazos, Burleson, Colorado, DeWitt and 18 more	3 hr
Apr 29, 1:10 PM CDT	Tornado Watch	SPC	Shelby	6 hr
Apr 29, 3:58 PM CDT	Mesoscale Discussion	SPC	Borden, Coke, Crockett, Fisher, Glasscock, Howard and 15 more	2 hr

Nearby

Mesoscale Discussions in Oklahoma, 2004 Mesoscale Discussions in Texas, 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.