Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 677

May 12, 200413 counties in Oklahoma; 19 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 12, 2004, 8:04 PM CDT for 13 counties in Oklahoma; 19 counties in Texas. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: May 12, 2004, 8:04 PM CDT (01:04 UTC)
Expired: May 12, 2004, 9:30 PM CDT
In force: 86 min
Issued by: the Storm Prediction Center

All 32 counties

Blaine County, OK, Caddo County, OK, Canadian County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Greer County, OK, Jackson County, OK, Kingfisher County, OK, Kiowa County, OK, Tillman County, OK, Washita County, OK, Archer County, TX, Baylor County, TX, Callahan County, TX, Fisher County, TX, Foard County, TX, Hardeman County, TX, Haskell County, TX, Jones County, TX, King County, TX, Knox County, TX, Nolan County, TX, Shackelford County, TX, Stephens County, TX, Stonewall County, TX, Taylor County, TX, Throckmorton County, TX, Wichita County, TX, Wilbarger County, TX, Young County, TX

The radar

The Altus AFB radar (KFDR), 53 km from the middle of the area, began a volume at 01:06 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

Norman, OK (KOUN), launched 00:00Z, 1.1 hours before the alert went out and 225 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: 3783 J/kg
Mixed-layer CIN: -38 J/kg
Mixed-layer LCL: 1124 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 120 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 6.1

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
May 12, 9:08 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Dewey, Ellis, Garfield, Grant, Harper and 8 more	37 min
May 12, 9:25 PM CDT	Tornado Watch	SPC	Alfalfa, Garfield, Grant, Kay, Nowata	7 hr
May 12, 11:55 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Garfield, Grant, Kay, Nowata, Osage	2 hr
May 13, 3:12 AM CDT	Mesoscale Discussion	SPC	Craig, Kay, Nowata, Osage, Ottawa, Washington	63 min
May 13, 10:20 AM CDT	Mesoscale Discussion	SPC	Atoka, Blaine, Caddo, Canadian, Carter, Cleveland and 35 more	115 min
May 13, 10:45 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Caddo, Canadian, Carter, Cherokee, Cleveland and 35 more	6 hr
May 13, 12:48 PM CDT	Mesoscale Discussion	SPC	Adair, Atoka, Caddo, Canadian, Carter, Cherokee and 41 more	117 min
May 13, 2:48 PM CDT	Mesoscale Discussion	SPC	Adair, Carter, Cherokee, Cleveland, Coal, Cotton and 29 more	87 min
May 13, 5:01 PM CDT	Mesoscale Discussion	SPC	Garfield, Grant, Kay, Noble, Osage	89 min
May 13, 3:52 AM CDT	Mesoscale Discussion	SPC	Anderson, Angelina, Austin, Bastrop, Brazos, Burleson and 27 more	83 min
May 13, 8:30 AM CDT	Tornado Watch	SPC	Angelina, Austin, Bastrop, Brazos, Burleson, Caldwell and 17 more	6 hr
May 13, 9:54 AM CDT	Mesoscale Discussion	SPC	Angelina, Austin, Bastrop, Brazos, Burleson, Caldwell and 17 more	96 min
May 13, 12:10 PM CDT	Tornado Watch	SPC	Angelina, Austin, Brazoria, Chambers, Colorado, Fayette and 22 more	6 hr
May 13, 12:26 PM CDT	Mesoscale Discussion	SPC	Bandera, Brown, Callahan, Coke, Coleman, Concho and 26 more	2 hr
May 13, 12:55 PM CDT	Tornado Watch	SPC	Brown, Callahan, Coleman, Concho, Eastland, Haskell and 14 more	6 hr
May 13, 1:38 PM CDT	Mesoscale Discussion	SPC	Austin, Brazoria, Chambers, Colorado, Fayette, Fort Bend and 15 more	97 min
May 13, 2:30 PM CDT	Tornado Watch	SPC	Atascosa, Bandera, Bastrop, Bexar, Caldwell, Comal and 21 more	6 hr
May 13, 2:57 PM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Coleman, Concho, Eastland, Haskell and 14 more	2 hr
May 13, 3:34 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bastrop, Bexar, Caldwell, Comal and 21 more	86 min
May 13, 5:22 PM CDT	Mesoscale Discussion	SPC	Angelina, Austin, Brazoria, Chambers, Colorado, Fort Bend and 17 more	53 min
May 13, 5:54 PM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Coleman, Concho, Eastland, Haskell and 14 more	96 min
May 13, 6:55 PM CDT	Severe Thunderstorm Watch	SPC	Bandera, Edwards, Gillespie, Kerr, Kimble, Mason and 6 more	5 hr

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.