Alert archive / Arkansas / Mesoscale Discussions in 2015

Mesoscale Discussion 2040

December 23, 20154 states

The Storm Prediction Center issued this mesoscale discussion at Dec 23, 2015, 12:48 PM CST for 4 states. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: Dec 23, 2015, 12:48 PM CST (18:48 UTC)
Expired: Dec 23, 2015, 1:45 PM CST
In force: 57 min
Issued by: the Storm Prediction Center

All 54 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Cleveland County, AR, Crittenden County, AR, Cross County, AR, Desha County, AR, Drew County, AR, Jefferson 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, St. Francis County, AR, Union County, AR, Woodruff County, AR, East Carroll Parish, LA, Morehouse Parish, LA, West Carroll Parish, LA, Benton County, MS, Bolivar County, MS, Coahoma County, MS, DeSoto County, MS, Grenada County, MS, Humphreys County, MS, Issaquena County, MS, Lafayette County, MS, Leflore County, MS, Marshall County, MS, Panola County, MS, Quitman County, MS, Sharkey County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tunica County, MS, Washington County, MS, Yalobusha County, MS, Crockett County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Haywood County, TN, Lauderdale County, TN, Madison County, TN, Shelby County, TN, Tipton County, TN

The radar

The Memphis radar (KNQA), 101 km from the middle of the area, began a volume at 18:49 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 (KBYH), launched 12:00Z, 6.8 hours before the alert went out and 64 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: 343 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 568 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 331 m²/s²
0-3 km storm-relative helicity: 353 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.9

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 22, 10:17 PM CST	Mesoscale Discussion	SPC	Clark, Columbia, Dallas, Garland, Hempstead, Hot Spring and 9 more	2 hr
Dec 23, 12:06 AM CST	Tornado Watch	SPC	Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 10 more	7 hr
Dec 23, 4:39 AM CST	Mesoscale Discussion	SPC	Bradley, Calhoun, Clark, Cleburne, Cleveland, Columbia and 37 more	2 hr
Dec 23, 6:13 AM CST	Mesoscale Discussion	SPC	Clay, Greene, Randolph	2 hr
Dec 23, 6:20 AM CST	Tornado Watch	SPC	Arkansas, Baxter, Boone, Bradley, Calhoun, Clark and 50 more	7 hr
Dec 23, 9:05 AM CST	Mesoscale Discussion	SPC	Arkansas, Clark, Clay, Cleburne, Cleveland, Craighead and 28 more	85 min
Dec 23, 9:13 AM CST	Tornado Watch	SPC	Clay, Craighead, Greene, Lawrence, Mississippi, Poinsett and 1 more	8 hr
Dec 23, 10:12 AM CST	Mesoscale Discussion	SPC	Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 10 more	93 min
Dec 23, 10:29 AM CST	Mesoscale Discussion	SPC	Clay	91 min
Dec 23, 10:58 AM CST	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Chicot, Cleveland, Crittenden and 11 more	2 hr
Dec 23, 11:57 AM CST	Tornado Watch PDS	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 12 more	9 hr
Dec 23, 2:49 PM CST	Mesoscale Discussion	SPC	Chicot, Crittenden, Cross, Desha, Lee, Mississippi and 2 more	86 min
Dec 22, 11:20 PM CST	Mesoscale Discussion	SPC	Jefferson, Lafourche, Plaquemines, St. Mary, Terrebonne	115 min
Dec 23, 2:34 AM CST	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Caldwell and 38 more	86 min
Dec 23, 1:33 PM CST	Mesoscale Discussion	SPC	East Baton Rouge, East Feliciana, Saint Helena, Washington	57 min
Dec 23, 2:17 PM CST	Tornado Watch	SPC	Attala, Choctaw, Clarke, Clay, Copiah, Covington and 29 more	6 hr
Dec 23, 5:12 PM CST	Mesoscale Discussion	SPC	Clarke, Covington, Forrest, George, Greene, Jasper and 19 more	63 min
Dec 23, 4:26 PM CST	Mesoscale Discussion	SPC	Bedford, Bledsoe, Cannon, Cheatham, Clay, Coffee and 38 more	64 min
Dec 23, 4:49 PM CST	Tornado Watch	SPC	Bedford, Cannon, Cheatham, Coffee, Davidson, Dickson and 23 more	6 hr

Nearby

Mesoscale Discussions in Arkansas, 2015 Mesoscale Discussions in Mississippi, 2015 Mesoscale Discussions in Tennessee, 2015 Every mesoscale discussion in 2015

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.