Alert archive / Arkansas / Mesoscale Discussions in 2004

Mesoscale Discussion 2391

November 1, 20044 states

The Storm Prediction Center issued this mesoscale discussion at Nov 1, 2004, 5:57 PM CST for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Nov 1, 2004, 5:57 PM CST (23:57 UTC)
Expired: Nov 1, 2004, 8:00 PM CST
In force: 2 hr
Issued by: the Storm Prediction Center

All 26 counties

Crittenden County, AR, Cross County, AR, Desha County, AR, Lee County, AR, Mississippi County, AR, Phillips County, AR, Poinsett County, AR, St. Francis County, AR, Dunklin County, MO, Pemiscot County, MO, Bolivar County, MS, Coahoma County, MS, DeSoto County, MS, Panola County, MS, Quitman 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 radar

The Memphis radar (KNQA), 30 km from the middle of the area, began a volume at 23:56 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, 12.0 hours before the alert went out and 59 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: 362 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 631 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 252 m²/s²
0-3 km storm-relative helicity: 264 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 2.6

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 1, 9:17 AM CST	Mesoscale Discussion	SPC	Bradley, Calhoun, Cleburne, Cleveland, Columbia, Dallas and 18 more	118 min
Nov 1, 10:00 AM CST	Tornado Watch	SPC	Arkansas, Ashley, Bradley, Calhoun, Cleveland, Cross and 16 more	6 hr
Nov 1, 1:11 PM CST	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Chicot, Cleveland, Cross and 8 more	94 min
Nov 1, 2:35 PM CST	Tornado Watch	SPC	Crittenden, Cross, Desha, Lee, Mississippi, Phillips and 2 more	5 hr
Nov 1, 2:25 PM CST	Mesoscale Discussion	SPC	Dunklin, Mississippi, New Madrid, Pemiscot	95 min

Nearby

Mesoscale Discussions in Arkansas, 2004 Mesoscale Discussions in Mississippi, 2004 Mesoscale Discussions in Tennessee, 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.