Alert archive / Kentucky / Mesoscale Discussions in 2014

Mesoscale Discussion 457

April 28, 20145 states

The Storm Prediction Center issued this mesoscale discussion at Apr 28, 2014, 3:13 PM CDT for 5 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 28, 2014, 3:13 PM CDT (20:13 UTC)
Expired
Apr 28, 2014, 5:15 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 107 counties

Alexander County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Johnson County, IL, Massac County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Saline County, IL, Union County, IL, White County, IL, Williamson County, IL, Perry County, IN, Posey County, IN, Spencer County, IN, Vanderburgh County, IN, Warrick County, IN, Adair County, KY, Allen County, KY, Ballard County, KY, Barren County, KY, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Casey County, KY, Christian County, KY, Clinton County, KY, Crittenden County, KY, Cumberland County, KY, Daviess County, KY, Edmonson County, KY, Fulton County, KY, Graves County, KY, Grayson County, KY, Green County, KY, Hancock County, KY, Hardin County, KY, Hart County, KY, Henderson County, KY, Hickman County, KY, Hopkins County, KY, Larue County, KY, Livingston County, KY, Logan County, KY, Lyon County, KY, Marion County, KY, Marshall County, KY, McCracken County, KY, McLean County, KY, Meade County, KY, Metcalfe County, KY, Monroe County, KY, Muhlenberg County, KY, Nelson County, KY, Ohio County, KY, Russell County, KY, Simpson County, KY, Taylor County, KY, Todd County, KY, Trigg County, KY, Union County, KY, Warren County, KY, Webster County, KY, Bollinger County, MO, Cape Girardeau County, MO, Mississippi County, MO, New Madrid County, MO, Perry County, MO, Scott County, MO, Stoddard County, MO, Benton County, TN, Cannon County, TN, Carroll County, TN, Cheatham County, TN, Clay County, TN, Davidson County, TN, DeKalb County, TN, Dickson County, TN, Dyer County, TN, Gibson County, TN, Henry County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Jackson County, TN, Lake County, TN, Macon County, TN, Montgomery County, TN, Obion County, TN, Overton County, TN, Pickett County, TN, Putnam County, TN, Robertson County, TN, Rutherford County, TN, Smith County, TN, Stewart County, TN, Sumner County, TN, Trousdale County, TN, Weakley County, TN, Williamson County, TN, Wilson County, TN

The radar

The Ft Campbell radar (KHPX), 1 km from the middle of the area, began a volume at 20:14 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 12:00Z, 8.2 hours before the alert went out and 92 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 12:00Z on 2014-04-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 267 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, Nashville Metro, TN at 12:00Z on 2014-04-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 573 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
267 J/kg
Mixed-layer CIN
-224 J/kg
Mixed-layer LCL
707 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
573 m²/s²
0-3 km storm-relative helicity
616 m²/s²
Significant tornado parameter
0.0
Supercell composite
14.5

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 27, 7:53 PM CDTTornado WatchSPCAlexander, Gallatin, Hardin, Jackson, Johnson, Massac and 5 more6 hr
Apr 27, 11:41 PM CDTMesoscale DiscussionSPCAlexander, Hardin, Johnson, Massac, Pope, Pulaski and 1 more94 min
Apr 28, 1:43 AM CDTMesoscale DiscussionSPCBond, Clinton, Franklin, Jackson, Jefferson, Madison and 8 more92 min
Apr 28, 12:54 PM CDTMesoscale DiscussionSPCAdams, Brown, Calhoun, Cass, Fulton, Greene and 16 more2 hr
Apr 28, 1:11 PM CDTTornado WatchSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 39 more7 hr
Apr 28, 3:38 PM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Bureau, Calhoun, Cass and 42 more2 hr
Apr 28, 6:10 PM CDTMesoscale DiscussionSPCBond, Bureau, Christian, Clay, Clinton, Coles and 51 more95 min
Apr 28, 4:30 AM CDTMesoscale DiscussionSPCClark, Floyd, Harrison, Jefferson, Scott, Switzerland90 min
Apr 27, 7:29 PM CDTMesoscale DiscussionSPCCarlisle, Fulton, Hickman91 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 27, 8:40 PM CDTMesoscale DiscussionSPCBarry, Barton, Bates, Benton, Camden, Carroll and 35 more65 min
Apr 27, 8:43 PM CDTMesoscale DiscussionSPCButler, Dunklin, Pemiscot62 min
Apr 27, 11:21 PM CDTMesoscale DiscussionSPCBarry, Camden, Christian, Dallas, Douglas, Greene and 13 more84 min
Apr 28, 1:43 AM CDTTornado WatchSPCDunklin, Pemiscot8 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 Kentucky, 2014Mesoscale Discussions in Tennessee, 2014Mesoscale Discussions in Illinois, 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.