Alert archive / Tennessee / Mesoscale Discussions in 2015

Mesoscale Discussion 2045

December 23, 20156 states

The Storm Prediction Center issued this mesoscale discussion at Dec 23, 2015, 2:49 PM CST for 6 states. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Dec 23, 2015, 2:49 PM CST (20:49 UTC)
Expired: Dec 23, 2015, 4:15 PM CST
In force: 86 min
Issued by: the Storm Prediction Center

All 69 counties

Lauderdale County, AL, Chicot County, AR, Crittenden County, AR, Cross County, AR, Desha County, AR, Lee County, AR, Mississippi County, AR, Phillips County, AR, St. Francis County, AR, Calloway County, KY, Pemiscot County, MO, Alcorn County, MS, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Coahoma County, MS, DeSoto County, MS, Grenada County, MS, Humphreys County, MS, Lafayette County, MS, Lee County, MS, Leflore County, MS, Marshall County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Tunica County, MS, Union County, MS, Washington County, MS, Yalobusha County, MS, Benton County, TN, Carroll County, TN, Cheatham County, TN, Chester County, TN, Crockett County, TN, Decatur County, TN, Dickson County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Lake County, TN, Lauderdale County, TN, Lawrence County, TN, Lewis County, TN, Madison County, TN, McNairy County, TN, Montgomery County, TN, Obion County, TN, Perry County, TN, Robertson County, TN, Shelby County, TN, Stewart County, TN, Tipton County, TN, Wayne County, TN, Weakley County, TN

The radar

The Memphis radar (KNQA), 40 km from the middle of the area, began a volume at 20:53 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 watches that followed

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

Tornado Watch 564Dec 23, 4:50 PM CST

The nearest sounding before it

Little Rock, AR (KBYH), launched 12:00Z, 8.8 hours before the alert went out and 69 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 23, 11:42 AM CST	Mesoscale Discussion	SPC	Barbour, Bullock, Coffee, Covington, Crenshaw, Dale and 4 more	93 min
Dec 23, 1:33 PM CST	Mesoscale Discussion	SPC	Autauga, Chilton, Choctaw, Clarke, Dallas, Greene and 7 more	57 min
Dec 23, 2:17 PM CST	Tornado Watch	SPC	Autauga, Bibb, Chilton, Choctaw, Clarke, Dallas and 11 more	6 hr
Dec 23, 4:26 PM CST	Mesoscale Discussion	SPC	Blount, Colbert, Cullman, Franklin, Jackson, Lauderdale and 7 more	64 min
Dec 23, 4:49 PM CST	Tornado Watch	SPC	Colbert, Cullman, Franklin, Lauderdale, Lawrence, Limestone and 2 more	6 hr
Dec 23, 5:12 PM CST	Mesoscale Discussion	SPC	Autauga, Bibb, Butler, Chilton, Choctaw, Clarke and 12 more	63 min
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, 12:48 PM CST	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 16 more	57 min
Dec 23, 12:06 PM CST	Mesoscale Discussion	SPC	Crittenden, Daviess, Hancock, Henderson, Union, Webster	84 min
Dec 23, 12:28 PM CST	Tornado Watch	SPC	Breckinridge, Bullitt, Butler, Carroll, Christian, Daviess and 24 more	8 hr
Dec 23, 2:16 PM CST	Mesoscale Discussion	SPC	Boone, Campbell, Carroll, Gallatin, Grant, Henry and 5 more	59 min
Dec 23, 3:17 PM CST	Severe Thunderstorm Watch	SPC	Boone, Bracken, Campbell, Gallatin, Grant, Kenton and 5 more	7 hr
Dec 23, 4:59 PM CST	Mesoscale Discussion	SPC	Adair, Allen, Anderson, Barren, Bourbon, Boyle and 51 more	2 hr
Dec 23, 2:34 AM CST	Mesoscale Discussion	SPC	Adams, Amite, Claiborne, Copiah, Covington, Franklin and 20 more	86 min
Dec 23, 12:42 PM CST	Mesoscale Discussion	SPC	Adair, Audrain, Boone, Callaway, Clark, Crawford and 29 more	2 hr
Dec 23, 1:55 PM CST	Tornado Watch	SPC	Audrain, Callaway, Clark, Franklin, Gasconade, Jefferson and 15 more	4 hr
Dec 23, 3:24 PM CST	Mesoscale Discussion	SPC	Audrain, Callaway, Clark, Franklin, Gasconade, Jefferson and 15 more	96 min

Nearby

Mesoscale Discussions in Tennessee, 2015 Mesoscale Discussions in Mississippi, 2015 Mesoscale Discussions in Arkansas, 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.