Alert archive / Arkansas / Mesoscale Discussions in 2003

Mesoscale Discussion 2523

November 18, 200328 counties in Arkansas; 16 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Nov 18, 2003, 1:11 PM CST for 28 counties in Arkansas; 16 counties in Oklahoma. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Nov 18, 2003, 1:11 PM CST (19:11 UTC)
Expired: Nov 18, 2003, 3:15 PM CST
In force: 2 hr
Issued by: the Storm Prediction Center

All 44 counties

Benton County, AR, Clark County, AR, Conway County, AR, Crawford County, AR, Dallas County, AR, Franklin County, AR, Garland County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Montgomery County, AR, Nevada County, AR, Newton County, AR, Ouachita County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Sevier County, AR, Washington County, AR, Yell County, AR, Adair County, OK, Cherokee County, OK, Delaware County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, Mayes County, OK, McCurtain County, OK, McIntosh County, OK, Muskogee County, OK, Pittsburg County, OK, Pushmataha County, OK, Rogers County, OK, Sequoyah County, OK, Wagoner County, OK, Washington County, OK

The watches that followed

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

Severe Thunderstorm Watch 962Nov 18, 2:50 PM CST

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 7.2 hours before the alert went out and 236 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: 357 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 576 m above ground
0-6 km bulk shear: 75 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 72 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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, 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

Nearby

Mesoscale Discussions in Arkansas, 2003 Mesoscale Discussions in Oklahoma, 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.