Alert archive / Arkansas / Mesoscale Discussions in 2003

Mesoscale Discussion 2528

November 18, 200340 counties in Arkansas; 4 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Nov 18, 2003, 4:44 PM CST for 40 counties in Arkansas; 4 counties in Missouri. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Nov 18, 2003, 4:44 PM CST (22:44 UTC)
Expired: Nov 18, 2003, 6:45 PM CST
In force: 2 hr
Issued by: the Storm Prediction Center

All 44 counties

Arkansas County, AR, Ashley County, AR, Baxter County, AR, Boone County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Cleburne County, AR, Cleveland County, AR, Conway County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Faulkner County, AR, Fulton County, AR, Garland County, AR, Grant County, AR, Hot Spring County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Jefferson County, AR, Lincoln County, AR, Lonoke County, AR, Marion County, AR, Monroe County, AR, Newton County, AR, Perry County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Searcy County, AR, Sharp County, AR, Stone County, AR, Union County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Howell County, MO, Oregon County, MO, Ozark County, MO, Taney County, MO

The radar

The Little Rock radar (KLZK), 19 km from the middle of the area, began a volume at 22:45 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

Little Rock, AR (KLZK), launched 12:00Z, 10.7 hours before the alert went out and 212 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: 137 J/kg
Mixed-layer CIN: -93 J/kg
Mixed-layer LCL: 756 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 16 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
Nov 17, 7:48 PM CST	Mesoscale Discussion	SPC	Calhoun, Columbia, Hempstead, Lafayette, Little River, Miller and 3 more	87 min
Nov 18, 1:29 AM CST	Mesoscale Discussion	SPC	Arkansas, Clay, Cleveland, Craighead, Crittenden, Cross and 21 more	3 hr
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, 7:35 AM CST	Mesoscale Discussion	SPC	Cape Girardeau, Mississippi, Scott	115 min

Nearby

Mesoscale Discussions in Arkansas, 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; radar from the NEXRAD Level II archive.