Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 503

April 29, 20048 counties in Oklahoma; 10 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2004, 8:56 PM CDT for 8 counties in Oklahoma; 10 counties in Texas. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Apr 29, 2004, 8:56 PM CDT (01:56 UTC)
Expired: Apr 29, 2004, 10:00 PM CDT
In force: 64 min
Issued by: the Storm Prediction Center

Counties Alfalfa County, OK, Blaine County, OK, Custer County, OK, Grant County, OK, Jackson County, OK, Kiowa County, OK, Major County, OK, Washita County, OK, Cottle County, TX, Crosby County, TX, Dickens County, TX, Foard County, TX, Garza County, TX, Hardeman County, TX, Kent County, TX, King County, TX, Motley County, TX, Stonewall County, TX

The radar

The Altus AFB radar (KFDR), 101 km from the middle of the area, began a volume at 01:58 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 131Apr 29, 11:05 PM CDT

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 1.9 hours before the alert went out and 254 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: 1108 J/kg
Mixed-layer CIN: -101 J/kg
Mixed-layer LCL: 1094 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 101 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

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, 9:28 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Garvin and 17 more	62 min
Apr 29, 10:27 PM CDT	Mesoscale Discussion	SPC	Caddo, Comanche, Cotton, Greer, Harmon, Jackson and 4 more	63 min
Apr 29, 11:05 PM CDT	Severe Thunderstorm Watch	SPC	Beckham, Caddo, Carter, Comanche, Cotton, Custer and 15 more	4 hr
Apr 30, 2:16 AM CDT	Mesoscale Discussion	SPC	Beckham, Caddo, Carter, Comanche, Cotton, Custer and 17 more	59 min
Apr 30, 12:45 PM CDT	Tornado Watch	SPC	Bryan, Carter, Cotton, Jefferson, Love, Marshall	8 hr
Apr 30, 3:09 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Blaine, Caddo, Canadian, Comanche, Custer and 9 more	2 hr
Apr 30, 4:10 PM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Haskell, Hughes, Latimer, LeFlore and 8 more	2 hr
Apr 30, 4:40 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Atoka, Carter, Cherokee, Cleveland, Coal and 23 more	5 hr
Apr 30, 5:53 PM CDT	Mesoscale Discussion	SPC	Bryan, Carter, Cotton, Jefferson, Love, Marshall	97 min
Apr 30, 12:01 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Eastland, Erath, Haskell, Hood and 9 more	119 min
Apr 30, 2:40 PM CDT	Mesoscale Discussion	SPC	Cooke, Denton, Eastland, Erath, Hood, Jack and 6 more	2 hr
Apr 30, 4:41 PM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Coleman, Comanche, Concho, Eastland and 12 more	94 min
Apr 30, 5:05 PM CDT	Severe Thunderstorm Watch	SPC	Bosque, Brown, Callahan, Coleman, Comanche, Concho and 16 more	5 hr
Apr 30, 6:08 PM CDT	Mesoscale Discussion	SPC	Bailey, Borden, Cochran, Dawson, Gaines, Hockley and 6 more	97 min

Nearby

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