Alert archive / Kentucky / Mesoscale Discussions in 2014

Mesoscale Discussion 274

April 3, 20146 states

The Storm Prediction Center issued this mesoscale discussion at Apr 3, 2014, 11:40 PM CDT for 6 states. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued
Apr 3, 2014, 11:40 PM CDT (04:40 UTC)
Expired
Apr 4, 2014, 1:15 AM CDT
In force
95 min
Issued by
the Storm Prediction Center
All 63 counties

Clay County, AR, Craighead County, AR, Greene County, AR, Lawrence County, AR, Mississippi County, AR, Poinsett County, AR, Alexander County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Johnson County, IL, Massac County, IL, Pope County, IL, Pulaski County, IL, Saline County, IL, Union County, IL, White County, IL, Williamson County, IL, Posey County, IN, Spencer County, IN, Vanderburgh County, IN, Warrick County, IN, Ballard County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Christian County, KY, Crittenden County, KY, Daviess County, KY, Fulton County, KY, Graves County, KY, Henderson County, KY, Hickman County, KY, Hopkins County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, McLean County, KY, Muhlenberg County, KY, Ohio County, KY, Todd County, KY, Trigg County, KY, Union County, KY, Webster County, KY, Butler County, MO, Cape Girardeau County, MO, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Scott County, MO, Stoddard County, MO, Crockett County, TN, Dyer County, TN, Gibson County, TN, Henry County, TN, Lake County, TN, Lauderdale County, TN, Obion County, TN, Weakley County, TN

The radar

The Paducah radar (KPAH), 58 km from the middle of the area, began a volume at 04:39 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, 4.7 hours before the alert went out and 213 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 2014-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 993 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 2014-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 233 square meters per square second.1939587897Sfc1 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
993 J/kg
Mixed-layer CIN
-136 J/kg
Mixed-layer LCL
1599 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
233 m²/s²
0-3 km storm-relative helicity
192 m²/s²
Significant tornado parameter
0.2
Supercell composite
6.5

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 3, 7:03 PM CDTMesoscale DiscussionSPCHempstead, Howard, Lafayette, Little River, Miller, Nevada and 1 more57 min
Apr 3, 7:26 PM CDTMesoscale DiscussionSPCBaxter, Boone, Carroll, Fulton, Madison, Marion94 min
Apr 3, 8:16 PM CDTMesoscale DiscussionSPCBaxter, Clay, Cleburne, Conway, Craighead, Crittenden and 29 more59 min
Apr 3, 8:30 PM CDTTornado WatchSPCClay, Craighead, Greene, Lawrence, Mississippi, Poinsett and 1 more7 hr
Apr 3, 8:44 PM CDTMesoscale DiscussionSPCColumbia, Crawford, Franklin, Hempstead, Howard, Lafayette and 7 more31 min
Apr 3, 8:54 PM CDTTornado WatchSPCColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more7 hr
Apr 3, 10:45 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 32 more60 min
Apr 4, 12:20 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 20 more55 min
Apr 4, 12:40 AM CDTTornado WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 16 more5 hr
Apr 4, 12:55 AM CDTMesoscale DiscussionSPCCalhoun, Columbia, Union95 min
Apr 4, 1:39 AM CDTMesoscale DiscussionSPCClark, Crawford, Dearborn, Decatur, Floyd, Franklin and 12 more3 hr
Apr 4, 2:12 AM CDTMesoscale DiscussionSPCCaldwell, Calloway, Christian, Hopkins, Lyon, McLean and 3 more63 min
Apr 4, 4:42 AM CDTMesoscale DiscussionSPCAdair, Casey, Clay, Clinton, Cumberland, Jackson and 12 more93 min
Apr 4, 4:58 AM CDTSevere Thunderstorm WatchSPCAdair, Bell, Breathitt, Casey, Clay, Clinton and 30 more5 hr
Apr 4, 7:41 AM CDTMesoscale DiscussionSPCBell, Breathitt, Clay, Floyd, Harlan, Jackson and 14 more49 min
Apr 4, 2:29 AM CDTMesoscale DiscussionSPCDecatur, Giles, Hardin, Lawrence, Lewis, Marshall and 3 more31 min
Apr 4, 2:52 AM CDTTornado WatchSPCBedford, Cannon, Cheatham, Clay, Coffee, Cumberland and 30 more5 hr
Apr 4, 3:45 AM CDTMesoscale DiscussionSPCChester, Hardeman, Hardin, Henderson, McNairy60 min
Apr 4, 5:28 AM CDTMesoscale DiscussionSPCBedford, Cannon, Coffee, Cumberland, Davidson, DeKalb and 21 more92 min
Apr 4, 7:00 AM CDTMesoscale DiscussionSPCBlount, Cocke, Greene, Jefferson, Monroe, Polk and 1 more90 min

Nearby

Mesoscale Discussions in Kentucky, 2014Mesoscale Discussions in Illinois, 2014Mesoscale Discussions in Missouri, 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.