Alert archive / Tennessee / Mesoscale Discussions in 2013

Mesoscale Discussion 2098

December 21, 20134 states

The Storm Prediction Center issued this mesoscale discussion at Dec 21, 2013, 10:45 AM CST for 4 states. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued
Dec 21, 2013, 10:45 AM CST (16:45 UTC)
Expired
Dec 21, 2013, 11:45 AM CST
In force
60 min
Issued by
the Storm Prediction Center
Chance of a watch
80%
All 44 counties

Arkansas County, AR, Bradley County, AR, Calhoun County, AR, Cleveland County, AR, Crittenden County, AR, Desha County, AR, Drew County, AR, Jefferson County, AR, Lee County, AR, Lincoln County, AR, Monroe County, AR, Ouachita County, AR, Phillips County, AR, St. Francis County, AR, Fulton County, KY, Benton County, MS, Bolivar County, MS, Coahoma County, MS, DeSoto County, MS, Lafayette County, MS, Leflore County, MS, Marshall County, MS, Panola County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tunica County, MS, Yalobusha County, MS, Carroll County, TN, Chester County, TN, Crockett County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Haywood County, TN, Henry County, TN, Lauderdale County, TN, Madison County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN, Weakley County, TN

The radar

The Memphis radar (KNQA), 86 km from the middle of the area, began a volume at 16:46 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.

The nearest sounding before it

Little Rock, AR (KBYH), launched 12:00Z, 4.8 hours before the alert went out and 44 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-pSkew-T log-p diagram, Little Rock, AR at 12:00Z on 2013-12-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 158 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Little Rock, AR at 12:00Z on 2013-12-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 518 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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
158 J/kg
Mixed-layer CIN
-96 J/kg
Mixed-layer LCL
461 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
518 m²/s²
0-3 km storm-relative helicity
610 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.0

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.

IssuedProductOfficeCountiesLasted
Dec 20, 6:44 PM CSTMesoscale DiscussionSPCClark, Dallas, Garland, Grant, Hempstead, Hot Spring and 11 more91 min
Dec 20, 8:18 PM CSTMesoscale DiscussionSPCBenton6 hr
Dec 20, 10:42 PM CSTMesoscale DiscussionSPCMiller2 hr
Dec 21, 2:31 AM CSTMesoscale DiscussionSPCClark, Clay, Cleburne, Columbia, Conway, Craighead and 30 more2 hr
Dec 21, 7:57 AM CSTMesoscale DiscussionSPCAshley, Bradley, Calhoun, Cleveland, Columbia, Drew and 3 more63 min
Dec 21, 9:46 AM CSTTornado WatchSPCAshley, Chicot, Columbia, Lafayette, Union8 hr
Dec 21, 12:01 PM CSTTornado WatchSPCArkansas, Bradley, Calhoun, Cleveland, Crittenden, Dallas and 10 more8 hr
Dec 21, 12:30 PM CSTMesoscale DiscussionSPCAshley, Chicot, Columbia, Lafayette, Union60 min
Dec 21, 2:50 PM CSTMesoscale DiscussionSPCArkansas, Bradley, Crittenden, Cross, Desha, Drew and 6 more55 min
Dec 21, 3:21 PM CSTMesoscale DiscussionSPCBreckinridge, Bullitt, Butler, Caldwell, Calloway, Christian and 23 more54 min
Dec 21, 4:49 PM CSTTornado WatchSPCBreckinridge, Bullitt, Butler, Caldwell, Calloway, Christian and 26 more5 hr
Dec 21, 5:06 PM CSTMesoscale DiscussionSPCAdams, Alcorn, Amite, Attala, Benton, Bolivar and 47 more84 min
Dec 21, 5:22 PM CSTTornado WatchSPCAdams, Amite, Attala, Bolivar, Carroll, Choctaw and 40 more7 hr
Dec 21, 5:46 PM CSTTornado WatchSPCAlcorn, Benton, Calhoun, Chickasaw, Coahoma, DeSoto and 16 more6 hr

Nearby

Mesoscale Discussions in Tennessee, 2013Mesoscale Discussions in Arkansas, 2013Mesoscale Discussions in Mississippi, 2013Every mesoscale discussion in 2013

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.