Alert archive / Tennessee / Mesoscale Discussions in 2014

Mesoscale Discussion 1879

October 13, 20145 counties in Alabama; Itawamba County, Monroe County, Tishomingo County, Mississippi; 10 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Oct 13, 2014, 5:27 PM CDT for 5 counties in Alabama; Itawamba County, Monroe County, Tishomingo County, Mississippi; 10 counties in Tennessee. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Oct 13, 2014, 5:27 PM CDT (22:27 UTC)
Expired: Oct 13, 2014, 6:30 PM CDT
In force: 63 min
Issued by: the Storm Prediction Center

Counties Colbert County, AL, Franklin County, AL, Lamar County, AL, Lauderdale County, AL, Marion County, AL, Itawamba County, MS, Monroe County, MS, Tishomingo County, MS, Decatur County, TN, Dickson County, TN, Hardin County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Lewis County, TN, Perry County, TN, Stewart County, TN, Wayne County, TN

The radar

The Columbus AFB radar (KGWX), 108 km from the middle of the area, began a volume at 22:29 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, 10.5 hours before the alert went out and 171 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: 687 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 657 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 228 m²/s²
0-3 km storm-relative helicity: 216 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 7.6

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
Oct 13, 12:13 PM CDT	Mesoscale Discussion	SPC	Barbour, Bullock, Butler, Coffee, Conecuh, Covington and 10 more	2 hr
Oct 13, 2:22 PM CDT	Mesoscale Discussion	SPC	Bibb, Blount, Chilton, Colbert, Cullman, Fayette and 18 more	113 min
Oct 13, 3:37 PM CDT	Tornado Watch	SPC	Autauga, Bibb, Blount, Calhoun, Cherokee, Chilton and 33 more	8 hr
Oct 13, 4:46 PM CDT	Mesoscale Discussion	SPC	Baldwin, Butler, Clarke, Coffee, Conecuh, Covington and 10 more	89 min
Oct 12, 8:04 PM CDT	Mesoscale Discussion	SPC	Benton, Bolivar, Carroll, Coahoma, DeSoto, Grenada and 17 more	86 min
Oct 12, 11:46 PM CDT	Mesoscale Discussion	SPC	Calhoun, Carroll, Chickasaw, Clay, Grenada, Itawamba and 10 more	89 min
Oct 13, 6:34 AM CDT	Mesoscale Discussion	SPC	Bolivar, Carroll, Coahoma, DeSoto, Grenada, Humphreys and 14 more	86 min
Oct 13, 7:08 AM CDT	Tornado Watch	SPC	Adams, Bolivar, Claiborne, Coahoma, DeSoto, Humphreys and 12 more	7 hr
Oct 13, 10:20 AM CDT	Mesoscale Discussion	SPC	Adams, Bolivar, Claiborne, Coahoma, DeSoto, Humphreys and 12 more	115 min
Oct 13, 11:52 AM CDT	Mesoscale Discussion	SPC	Alcorn, Attala, Benton, Bolivar, Calhoun, Carroll and 45 more	113 min
Oct 13, 12:57 PM CDT	Tornado Watch	SPC	Adams, Alcorn, Attala, Benton, Bolivar, Calhoun and 63 more	7 hr
Oct 13, 1:39 PM CDT	Tornado Watch	SPC	Amite, George, Greene, Hancock, Harrison, Jackson and 7 more	8 hr
Oct 13, 5:45 PM CDT	Mesoscale Discussion	SPC	George, Hancock, Harrison, Pearl River, Stone	90 min

Nearby

Mesoscale Discussions in Tennessee, 2014 Mesoscale Discussions in Alabama, 2014 Mesoscale Discussions in Mississippi, 2014 Every mesoscale discussion in 2014

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.