Alert archive / Oklahoma / Mesoscale Discussions in 2004

Mesoscale Discussion 2503

December 6, 200412 counties in Oklahoma; 12 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Dec 6, 2004, 12:20 PM CST for 12 counties in Oklahoma; 12 counties in Texas. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: Dec 6, 2004, 12:20 PM CST (18:20 UTC)
Expired: Dec 6, 2004, 2:15 PM CST
In force: 115 min
Issued by: the Storm Prediction Center

All 24 counties

Caddo County, OK, Comanche County, OK, Cotton County, OK, Grady County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Jefferson County, OK, Kiowa County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Foard County, TX, Hardeman County, TX, Jack County, TX, Knox County, TX, Montague County, TX, Throckmorton County, TX, Wichita County, TX, Wilbarger County, TX, Young County, TX

The radar

The Altus AFB radar (KFDR), 34 km from the middle of the area, began a volume at 18:22 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

Norman, OK (KOUN), launched 12:00Z, 6.3 hours before the alert went out and 152 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: 2357 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 62 m²/s²
0-3 km storm-relative helicity: 104 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
Dec 6, 12:40 PM CST	Severe Thunderstorm Watch	SPC	Atoka, Bryan, Caddo, Carter, Cleveland, Coal and 20 more	5 hr
Dec 6, 4:58 PM CST	Mesoscale Discussion	SPC	Atoka, Bryan, Caddo, Carter, Choctaw, Cleveland and 28 more	92 min
Dec 6, 5:45 PM CST	Severe Thunderstorm Watch	SPC	Adair, LeFlore, McCurtain, Sequoyah	5 hr
Dec 6, 10:35 AM CST	Mesoscale Discussion	SPC	Borden, Callahan, Coke, Coleman, Fisher, Glasscock and 16 more	115 min
Dec 6, 11:55 AM CST	Severe Thunderstorm Watch	SPC	Callahan, Coke, Coleman, Concho, Fisher, Haskell and 8 more	5 hr
Dec 6, 1:30 PM CST	Mesoscale Discussion	SPC	Bosque, Brown, Callahan, Coleman, Comanche, Coryell and 17 more	90 min
Dec 6, 1:45 PM CST	Severe Thunderstorm Watch	SPC	Archer, Bosque, Brown, Clay, Collin, Comanche and 30 more	6 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.