Alert archive / Arkansas / Mesoscale Discussions in 2004

Mesoscale Discussion 2508

December 6, 20044 states

The Storm Prediction Center issued this mesoscale discussion at Dec 6, 2004, 9:51 PM CST for 4 states. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: Dec 6, 2004, 9:51 PM CST (03:51 UTC)
Expired: Dec 6, 2004, 11:45 PM CST
In force: 114 min
Issued by: the Storm Prediction Center

All 31 counties

Clay County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Greene County, AR, Independence County, AR, Jackson County, AR, Lawrence County, AR, Lee County, AR, Lonoke County, AR, Mississippi County, AR, Monroe County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, St. Francis County, AR, White County, AR, Woodruff County, AR, Dunklin County, MO, Pemiscot County, MO, DeSoto County, MS, Tunica County, MS, Crockett County, TN, Dyer County, TN, Gibson County, TN, Haywood County, TN, Lake County, TN, Lauderdale County, TN, Shelby County, TN, Tipton County, TN

The radar

The Memphis radar (KNQA), 70 km from the middle of the area, began a volume at 03:53 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 00:00Z, 3.9 hours before the alert went out and 97 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: 5 J/kg
Mixed-layer CIN: -192 J/kg
Mixed-layer LCL: 820 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 238 m²/s²
0-3 km storm-relative helicity: 280 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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
Dec 6, 8:36 PM CST	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 36 more	84 min
Dec 6, 8:50 PM CST	Severe Thunderstorm Watch	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 9 more	5 hr
Dec 6, 11:00 PM CST	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 10 more	90 min
Dec 6, 11:20 PM CST	Tornado Watch	SPC	Ashley, Chicot, Desha, Drew	6 hr
Dec 7, 1:25 AM CST	Mesoscale Discussion	SPC	Adams, Attala, Calhoun, Carroll, Chickasaw, Choctaw and 41 more	95 min
Dec 7, 3:25 AM CST	Tornado Watch	SPC	Kemper, Lauderdale, Noxubee	5 hr
Dec 7, 6:03 AM CST	Mesoscale Discussion	SPC	George, Greene, Hancock, Harrison, Jackson, Perry and 1 more	57 min

Nearby

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