Alert archive / Tennessee / Mesoscale Discussions in 2014

Mesoscale Discussion 436

April 27, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Apr 27, 2014, 7:29 PM CDT for 4 states. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued
Apr 27, 2014, 7:29 PM CDT (00:29 UTC)
Expired
Apr 27, 2014, 9:00 PM CDT
In force
91 min
Issued by
the Storm Prediction Center
Chance of a watch
80%
All 28 counties

Clay County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Greene County, AR, Mississippi County, AR, Poinsett County, AR, Carlisle County, KY, Fulton County, KY, Hickman County, KY, Butler County, MO, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Ripley County, MO, Scott County, MO, Stoddard County, MO, Crockett County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Haywood County, TN, Lake County, TN, Lauderdale County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN

The radar

The Memphis radar (KNQA), 97 km from the middle of the area, began a volume at 00:30 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 00:00Z, 0.5 hours before the alert went out and 153 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 00:00Z on 2014-04-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2449 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 00:00Z on 2014-04-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 480 square meters per square second.19395878Sfc1 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
2449 J/kg
Mixed-layer CIN
-28 J/kg
Mixed-layer LCL
619 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
480 m²/s²
0-3 km storm-relative helicity
618 m²/s²
Significant tornado parameter
8.8
Supercell composite
40.3

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.

IssuedProductOfficeCountiesLasted
Apr 27, 7:15 PM CDTMesoscale DiscussionSPCFaulkner30 min
Apr 27, 7:53 PM CDTTornado WatchSPCClay, Craighead, Crittenden, Cross, Greene, Lawrence and 4 more6 hr
Apr 27, 8:09 PM CDTMesoscale DiscussionSPCColumbia, Lafayette, Miller, Union66 min
Apr 27, 8:43 PM CDTMesoscale DiscussionSPCClark, Clay, Cleburne, Cleveland, Conway, Craighead and 45 more62 min
Apr 27, 9:59 PM CDTMesoscale DiscussionSPCCalhoun, Clark, Cleburne, Cleveland, Columbia, Conway and 36 more91 min
Apr 27, 10:33 PM CDTTornado WatchSPCArkansas, Bradley, Calhoun, Clark, Cleveland, Conway and 27 more7 hr
Apr 27, 11:08 PM CDTTornado WatchSPCColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more6 hr
Apr 27, 11:21 PM CDTMesoscale DiscussionSPCArkansas, Baxter, Boone, Bradley, Calhoun, Carroll and 38 more84 min
Apr 27, 11:41 PM CDTMesoscale DiscussionSPCClay, Craighead, Crittenden, Cross, Greene, Mississippi and 2 more94 min
Apr 28, 1:43 AM CDTTornado WatchSPCClay, Craighead, Crittenden, Cross, Greene, Lawrence and 6 more8 hr
Apr 28, 2:50 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 25 more115 min
Apr 28, 4:21 AM CDTMesoscale DiscussionSPCAshley, Bradley, Chicot, Columbia, Drew, Union54 min
Apr 28, 4:40 AM CDTTornado WatchSPCAshley, Chicot, Union7 hr
Apr 28, 7:16 AM CDTMesoscale DiscussionSPCChicot89 min
Apr 28, 9:53 AM CDTMesoscale DiscussionSPCChicot97 min
Apr 28, 4:30 AM CDTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Bath, Bourbon and 61 more90 min
Apr 28, 6:57 AM CDTMesoscale DiscussionSPCCalloway, Christian, Logan, Simpson, Todd, Trigg2 hr
Apr 28, 12:50 PM CDTMesoscale DiscussionSPCClinton, McCreary, Wayne55 min
Apr 28, 1:33 PM CDTTornado WatchSPCBell, Clay, Floyd, Harlan, Knott, Knox and 5 more5 hr
Apr 28, 3:12 PM CDTMesoscale DiscussionSPCHarlan, Letcher, Pike63 min
Apr 28, 3:13 PM CDTMesoscale DiscussionSPCAdair, Allen, Ballard, Barren, Breckinridge, Bullitt and 43 more2 hr
Apr 28, 6:10 PM CDTMesoscale DiscussionSPCBallard, Caldwell, Christian, Crittenden, Graves, Henderson and 9 more95 min
Apr 27, 8:40 PM CDTMesoscale DiscussionSPCBarry, Barton, Bates, Benton, Camden, Carroll and 35 more65 min
Apr 28, 1:43 AM CDTMesoscale DiscussionSPCCape Girardeau, Franklin, Gasconade, Iron, Jefferson, Madison and 7 more92 min
Apr 28, 12:54 PM CDTMesoscale DiscussionSPCAudrain, Callaway, Clark, Crawford, Franklin, Gasconade and 19 more2 hr
Apr 28, 1:11 PM CDTTornado WatchSPCAudrain, Callaway, Clark, Crawford, Franklin, Gasconade and 16 more7 hr
Apr 28, 3:38 PM CDTMesoscale DiscussionSPCClark, Jefferson, Lincoln, Pike, Saint Charles, Saint Louis and 1 more2 hr
Apr 28, 12:05 PM CDTMesoscale DiscussionSPCBedford, Giles, Hardin, Lawrence, Lewis, Lincoln and 5 more115 min
Apr 28, 12:39 PM CDTTornado Watch PDSSPCBedford, Chester, Coffee, Decatur, Franklin, Giles and 13 more8 hr
Apr 28, 2:09 PM CDTMesoscale DiscussionSPCGiles, Hardin, Lawrence, Lincoln, Wayne66 min
Apr 28, 5:22 PM CDTMesoscale DiscussionSPCBradley, Coffee, Franklin, Giles, Grundy, Hamilton and 8 more83 min
Apr 28, 5:37 PM CDTTornado Watch PDSSPCAnderson, Bledsoe, Blount, Bradley, Campbell, Claiborne and 25 more6 hr

Nearby

Mesoscale Discussions in Tennessee, 2014Mesoscale Discussions in Missouri, 2014Mesoscale Discussions in Arkansas, 2014Every 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.