Alert archive / Arkansas / Mesoscale Discussions in 2003

Mesoscale Discussion 2515

November 18, 20036 states

The Storm Prediction Center issued this mesoscale discussion at Nov 18, 2003, 1:29 AM CST for 6 states. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Nov 18, 2003, 1:29 AM CST (07:29 UTC)
Expired: Nov 18, 2003, 4:00 AM CST
In force: 3 hr
Issued by: the Storm Prediction Center

All 60 counties

Arkansas County, AR, Clay County, AR, Cleveland County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Desha County, AR, Drew County, AR, Greene County, AR, Independence County, AR, Jackson County, AR, Jefferson County, AR, Lawrence County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Mississippi County, AR, Monroe County, AR, Phillips County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Sharp County, AR, St. Francis County, AR, White County, AR, Woodruff County, AR, Alexander County, IL, Pulaski County, IL, Ballard County, KY, Fulton County, KY, Butler County, MO, Carter County, MO, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Ripley County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO, Bolivar County, MS, Coahoma County, MS, DeSoto County, MS, Leflore County, MS, Marshall County, MS, Panola County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tunica County, MS, Dyer County, TN, Fayette County, TN, Haywood County, TN, Lake County, TN, Lauderdale County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 956Nov 18, 1:55 AM CST

The nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 7.5 hours before the alert went out and 50 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: 540 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 514 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 199 m²/s²
0-3 km storm-relative helicity: 305 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.8

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
Nov 17, 7:48 PM CST	Mesoscale Discussion	SPC	Calhoun, Columbia, Hempstead, Lafayette, Little River, Miller and 3 more	87 min
Nov 18, 1:55 AM CST	Tornado Watch	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clay and 34 more	6 hr
Nov 18, 9:55 AM CST	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Conway, Crawford and 22 more	65 min
Nov 18, 10:55 AM CST	Severe Thunderstorm Watch	SPC	Benton, Calhoun, Clark, Conway, Crawford, Dallas and 24 more	5 hr
Nov 18, 1:11 PM CST	Mesoscale Discussion	SPC	Benton, Clark, Conway, Crawford, Dallas, Franklin and 22 more	2 hr
Nov 18, 2:50 PM CST	Severe Thunderstorm Watch	SPC	Arkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 38 more	5 hr
Nov 18, 4:44 PM CST	Mesoscale Discussion	SPC	Arkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 34 more	2 hr
Nov 18, 7:35 AM CST	Mesoscale Discussion	SPC	Alexander, Clark, Clay, Coles, Crawford, Cumberland and 24 more	115 min
Nov 18, 1:33 PM CST	Mesoscale Discussion	SPC	Adair, Allen, Barren, Boyle, Casey, Clinton and 15 more	57 min
Nov 18, 2:08 AM CST	Mesoscale Discussion	SPC	Adams, Amite, Claiborne, Copiah, Franklin, Hinds and 9 more	97 min
Nov 18, 2:25 AM CST	Tornado Watch	SPC	Adams, Amite, Claiborne, Copiah, Franklin, Hinds and 18 more	6 hr
Nov 18, 4:48 AM CST	Mesoscale Discussion	SPC	Adams, Amite, Attala, Carroll, Claiborne, Copiah and 29 more	117 min
Nov 18, 6:08 AM CST	Mesoscale Discussion	SPC	Alcorn, Attala, Benton, Calhoun, Chickasaw, Choctaw and 46 more	2 hr
Nov 18, 6:55 AM CST	Tornado Watch	SPC	Alcorn, Amite, Attala, Benton, Calhoun, Carroll and 56 more	5 hr
Nov 18, 10:30 AM CST	Mesoscale Discussion	SPC	George, Greene, Harrison, Jackson	90 min
Nov 18, 11:25 AM CST	Tornado Watch	SPC	George, Greene, Jackson	6 hr
Nov 18, 1:55 PM CST	Tornado Watch	SPC	Bledsoe, Bradley, Cannon, Clay, Coffee, Cumberland and 22 more	5 hr
Nov 18, 3:26 PM CST	Mesoscale Discussion	SPC	Anderson, Bradley, Campbell, Cumberland, Fentress, Loudon and 8 more	94 min
Nov 18, 4:58 PM CST	Mesoscale Discussion	SPC	Anderson, Bledsoe, Blount, Bradley, Cocke, Cumberland and 20 more	32 min

Nearby

Mesoscale Discussions in Arkansas, 2003 Mesoscale Discussions in Mississippi, 2003 Mesoscale Discussions in Missouri, 2003 Every mesoscale discussion in 2003

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.