Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 170

March 4, 20044 states

The Storm Prediction Center issued this mesoscale discussion at Mar 4, 2004, 2:18 PM CST for 4 states. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: Mar 4, 2004, 2:18 PM CST (20:18 UTC)
Expired: Mar 4, 2004, 3:15 PM CST
In force: 57 min
Issued by: the Storm Prediction Center

All 45 counties

Clark County, AR, Columbia County, AR, Garland County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Pike County, AR, Polk County, AR, Scott County, AR, Sevier County, AR, Yell County, AR, Bossier Parish, LA, Caddo Parish, LA, Choctaw County, OK, McCurtain County, OK, Anderson County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Delta County, TX, Fannin County, TX, Franklin County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Hopkins County, TX, Lamar County, TX, Marion County, TX, Morris County, TX, Panola County, TX, Rains County, TX, Red River County, TX, Rusk County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 150 km from the middle of the area, began a volume at 20:18 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.

Tornado Watch 25Mar 4, 3:00 PM CST

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 8.3 hours before the alert went out and 151 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: 18 J/kg
Mixed-layer CIN: -235 J/kg
Mixed-layer LCL: 713 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 214 m²/s²
0-3 km storm-relative helicity: 187 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
Mar 4, 9:28 AM CST	Mesoscale Discussion	SPC	Crawford, Sebastian, Washington	62 min
Mar 4, 1:25 PM CST	Mesoscale Discussion	SPC	Benton, Carroll, Crawford, Franklin, Johnson, Logan and 7 more	65 min
Mar 4, 2:05 PM CST	Tornado Watch	SPC	Benton, Boone, Carroll, Crawford, Franklin, Madison and 3 more	6 hr
Mar 4, 3:00 PM CST	Tornado Watch	SPC	Clark, Columbia, Garland, Hempstead, Hot Spring, Howard and 14 more	6 hr
Mar 4, 4:41 PM CST	Mesoscale Discussion	SPC	Calhoun, Clark, Columbia, Dallas, Garland, Grant and 16 more	2 hr
Mar 4, 5:32 PM CST	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Fulton, Madison and 3 more	118 min
Mar 4, 1:56 AM CST	Mesoscale Discussion	SPC	Beckham, Caddo, Canadian, Carter, Cleveland, Comanche and 15 more	94 min
Mar 4, 2:00 AM CST	Severe Thunderstorm Watch	SPC	Beckham, Blaine, Caddo, Canadian, Carter, Cleveland and 23 more	5 hr
Mar 4, 2:44 AM CST	Mesoscale Discussion	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Carter and 36 more	3 hr
Mar 4, 5:01 AM CST	Mesoscale Discussion	SPC	Beckham, Blaine, Caddo, Canadian, Carter, Cleveland and 24 more	119 min
Mar 4, 6:55 AM CST	Severe Thunderstorm Watch	SPC	Beckham, Custer, Dewey, Ellis, Greer, Harmon and 6 more	6 hr
Mar 4, 7:20 AM CST	Severe Thunderstorm Watch	SPC	Alfalfa, Blaine, Caddo, Canadian, Cleveland, Comanche and 23 more	6 hr
Mar 4, 7:55 AM CST	Mesoscale Discussion	SPC	Alfalfa, Beckham, Blaine, Canadian, Custer, Dewey and 17 more	3 hr
Mar 4, 9:45 AM CST	Tornado Watch	SPC	Caddo, Canadian, Cleveland, Comanche, Cotton, Garvin and 8 more	5 hr
Mar 4, 11:52 AM CST	Mesoscale Discussion	SPC	Carter, Cleveland, Comanche, Cotton, Garvin, Grady and 7 more	53 min
Mar 4, 1:02 PM CST	Mesoscale Discussion	SPC	Caddo, Canadian, Cleveland, Comanche, Cotton, Garvin and 6 more	88 min
Mar 4, 2:02 PM CST	Mesoscale Discussion	SPC	Canadian, Carter, Cleveland, Comanche, Creek, Garvin and 12 more	88 min
Mar 3, 7:03 PM CST	Mesoscale Discussion	SPC	Andrews, Borden, Coke, Crane, Crockett, Dawson and 25 more	117 min
Mar 3, 8:40 PM CST	Severe Thunderstorm Watch	SPC	Andrews, Borden, Cottle, Crane, Crosby, Dawson and 20 more	5 hr
Mar 3, 11:44 PM CST	Mesoscale Discussion	SPC	Andrews, Borden, Crane, Crosby, Dawson, Dickens and 16 more	2 hr
Mar 4, 4:25 AM CST	Tornado Watch	SPC	Callahan, Coke, Coleman, Concho, Crockett, Fisher and 23 more	6 hr
Mar 4, 5:32 AM CST	Mesoscale Discussion	SPC	Callahan, Coke, Coleman, Concho, Crockett, Fisher and 23 more	118 min
Mar 4, 8:43 AM CST	Mesoscale Discussion	SPC	Archer, Baylor, Callahan, Coke, Coleman, Concho and 26 more	62 min
Mar 4, 10:46 AM CST	Mesoscale Discussion	SPC	Atascosa, Bandera, Bell, Bexar, Blanco, Bosque and 27 more	89 min
Mar 4, 11:50 AM CST	Tornado Watch	SPC	Bandera, Bell, Blanco, Bosque, Brown, Burnet and 42 more	5 hr
Mar 4, 11:52 AM CST	Mesoscale Discussion	SPC	Austin, Brazoria, Brazos, Burleson, Chambers, Colorado and 15 more	113 min
Mar 4, 1:42 PM CST	Mesoscale Discussion	SPC	Bell, Blanco, Bosque, Burnet, Collin, Coryell and 17 more	63 min

Nearby

Mesoscale Discussions in Texas, 2004 Mesoscale Discussions in Arkansas, 2004 Mesoscale Discussions in Louisiana, 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.