Alert archive / Tennessee / Mesoscale Discussions in 2014

Mesoscale Discussion 448

April 28, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Apr 28, 2014, 6:57 AM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 28, 2014, 6:57 AM CDT (11:57 UTC)
Expired
Apr 28, 2014, 9:00 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 48 counties

Lauderdale County, AL, Calloway County, KY, Christian County, KY, Logan County, KY, Simpson County, KY, Todd County, KY, Trigg County, KY, Alcorn County, MS, Benton County, MS, Lafayette County, MS, Lee County, MS, Marshall County, MS, Pontotoc County, MS, Prentiss County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Benton County, TN, Carroll County, TN, Cheatham County, TN, Chester County, TN, Crockett County, TN, Davidson County, TN, Decatur County, TN, Dickson 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, Lawrence County, TN, Lewis County, TN, Madison County, TN, Maury County, TN, McNairy County, TN, Montgomery County, TN, Perry County, TN, Robertson County, TN, Stewart County, TN, Sumner County, TN, Wayne County, TN, Weakley County, TN, Williamson County, TN

The radar

The Ft Campbell radar (KHPX), 141 km from the middle of the area, began a volume at 11:59 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

Nashville Metro, TN (KBNA), launched 00:00Z, 12.0 hours before the alert went out and 150 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, Nashville Metro, TN at 00:00Z on 2014-04-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Nashville Metro, TN at 00:00Z on 2014-04-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 160 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1070 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
160 m²/s²
0-3 km storm-relative helicity
357 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
Apr 28, 9:53 AM CDTMesoscale DiscussionSPCFayette, Lamar, Marion, Pickens97 min
Apr 28, 12:05 PM CDTMesoscale DiscussionSPCColbert, Fayette, Franklin, Lamar, Lauderdale, Lawrence and 6 more115 min
Apr 28, 12:39 PM CDTTornado Watch PDSSPCColbert, Cullman, DeKalb, Fayette, Franklin, Greene and 14 more8 hr
Apr 28, 2:09 PM CDTMesoscale DiscussionSPCBlount, Colbert, Cullman, Fayette, Franklin, Jackson and 13 more66 min
Apr 28, 3:49 PM CDTMesoscale DiscussionSPCColbert, Franklin, Lamar, Lawrence, Limestone, Marion and 1 more86 min
Apr 28, 5:22 PM CDTMesoscale DiscussionSPCColbert, Cullman, Fayette, Franklin, Jackson, Lamar and 9 more83 min
Apr 28, 5:56 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Calhoun, Chambers, Cherokee, Chilton and 13 more64 min
Apr 27, 7:29 PM CDTMesoscale DiscussionSPCCarlisle, Fulton, Hickman91 min
Apr 27, 7:53 PM CDTTornado WatchSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more6 hr
Apr 27, 11:41 PM CDTMesoscale DiscussionSPCBallard, Carlisle, Crittenden, Fulton, Graves, Hickman and 5 more94 min
Apr 28, 4:30 AM CDTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Bath, Bourbon and 61 more90 min
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, 7:03 PM CDTMesoscale DiscussionSPCCalhoun, Chickasaw, Clay, Grenada, Itawamba, Lafayette and 10 more87 min
Apr 28, 1:43 AM CDTTornado WatchSPCAlcorn, Benton, Calhoun, Chickasaw, Coahoma, DeSoto and 16 more8 hr
Apr 28, 2:50 AM CDTMesoscale DiscussionSPCBolivar, Coahoma, Quitman, Tunica, Washington115 min
Apr 28, 4:40 AM CDTTornado WatchSPCBolivar, Carroll, Grenada, Holmes, Humphreys, Issaquena and 8 more7 hr
Apr 28, 7:16 AM CDTMesoscale DiscussionSPCAttala, Calhoun, Carroll, Choctaw, Claiborne, Grenada and 14 more89 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 Mississippi, 2014Mesoscale Discussions in Kentucky, 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.