Alert archive / Kentucky / Mesoscale Discussions in 2011

Mesoscale Discussion 630

April 27, 20116 states

The Storm Prediction Center issued this mesoscale discussion at Apr 27, 2011, 3:06 PM CDT for 6 states. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Apr 27, 2011, 3:06 PM CDT (20:06 UTC)
Expired: Apr 27, 2011, 4:00 PM CDT
In force: 54 min
Issued by: the Storm Prediction Center

All 107 counties

Clay County, AR, Craighead County, AR, Greene County, AR, Mississippi County, AR, Poinsett County, AR, Alexander County, IL, Edwards 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, Wabash County, IL, White County, IL, Williamson County, IL, Crawford County, IN, Daviess County, IN, Dubois County, IN, Gibson County, IN, Knox County, IN, Lawrence County, IN, Martin County, IN, Orange County, IN, Perry County, IN, Pike County, IN, Posey County, IN, Spencer County, IN, Vanderburgh County, IN, Warrick County, IN, Allen County, KY, Ballard County, KY, Barren County, KY, Breckinridge County, KY, Butler County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Christian County, KY, Crittenden County, KY, Daviess County, KY, Edmonson County, KY, Fulton County, KY, Graves County, KY, Grayson County, KY, Hancock County, KY, Henderson County, KY, Hickman County, KY, Hopkins County, KY, Livingston County, KY, Logan County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, McLean County, KY, Meade County, KY, Muhlenberg County, KY, Ohio County, KY, Simpson County, KY, Todd County, KY, Trigg County, KY, Union County, KY, Warren County, KY, Webster County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Perry County, MO, Scott County, MO, Stoddard County, MO, Benton County, TN, Carroll County, TN, Cheatham County, TN, Chester County, TN, Crockett County, TN, Davidson County, TN, Decatur County, TN, Dickson County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Houston County, TN, Humphreys County, TN, Lake County, TN, Lauderdale County, TN, Macon County, TN, Madison County, TN, Montgomery County, TN, Obion County, TN, Robertson County, TN, Stewart County, TN, Sumner County, TN, Tipton County, TN, Trousdale County, TN, Weakley County, TN

The radar

The Paducah radar (KPAH), 62 km from the middle of the area, began a volume at 20:09 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

Nashville Metro, TN (KBNA), launched 12:00Z, 8.1 hours before the alert went out and 187 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 714 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: -84 m²/s²
0-3 km storm-relative helicity: -38 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.

Issued	Product	Office	Counties	Lasted
Apr 26, 7:59 PM CDT	Mesoscale Discussion	SPC	Chicot	2 hr
Apr 26, 8:53 PM CDT	Mesoscale Discussion	SPC	Calhoun, Clark, Columbia, Dallas, Grant, Hempstead and 10 more	97 min
Apr 26, 9:13 PM CDT	Mesoscale Discussion	SPC	Arkansas, Clay, Craighead, Crittenden, Cross, Desha and 21 more	62 min
Apr 26, 9:33 PM CDT	Tornado Watch PDS	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 11 more	7 hr
Apr 26, 9:58 PM CDT	Tornado Watch	SPC	Craighead, Crittenden, Cross, Greene, Jackson, Lee and 8 more	7 hr
Apr 26, 11:33 PM CDT	Mesoscale Discussion	SPC	Chicot, Desha, Phillips	117 min
Apr 27, 3:29 AM CDT	Mesoscale Discussion	SPC	Hempstead, Lafayette, Little River, Miller	2 hr
Apr 27, 4:53 AM CDT	Severe Thunderstorm Watch	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 19 more	5 hr
Apr 27, 6:25 AM CDT	Mesoscale Discussion	SPC	Arkansas, Cleburne, Crittenden, Cross, Desha, Faulkner and 15 more	65 min
Apr 27, 8:40 AM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Clay, Cleburne and 28 more	65 min
Apr 27, 9:48 AM CDT	Mesoscale Discussion	SPC	Ashley, Bradley, Calhoun, Chicot, Clark, Cleveland and 10 more	27 min
Apr 27, 11:02 AM CDT	Tornado Watch PDS	SPC	Ashley, Chicot	8 hr
Apr 27, 12:42 PM CDT	Severe Thunderstorm Watch	SPC	Baxter, Clay, Cleburne, Conway, Craighead, Crittenden and 19 more	5 hr
Apr 27, 3:29 PM CDT	Tornado Watch	SPC	Mississippi	5 hr
Apr 26, 8:35 PM CDT	Mesoscale Discussion	SPC	Crawford, Edwards, Gallatin, Lawrence, Wabash, White	55 min
Apr 27, 5:27 PM CDT	Mesoscale Discussion	SPC	Clark, Crawford, Edwards, Gallatin, Hamilton, Hardin and 7 more	63 min
Apr 26, 7:33 PM CDT	Mesoscale Discussion	SPC	Adams, Allen, Blackford, Boone, Carroll, Cass and 35 more	57 min
Apr 27, 4:38 PM CDT	Mesoscale Discussion	SPC	Clark, Crawford, Floyd, Harrison, Jefferson, Ohio and 4 more	37 min
Apr 27, 4:44 PM CDT	Tornado Watch	SPC	Clark, Crawford, Dubois, Floyd, Harrison, Jefferson and 5 more	7 hr
Apr 27, 6:22 PM CDT	Tornado Watch	SPC	Adams, Bartholomew, Blackford, Boone, Brown, Carroll and 49 more	8 hr
Apr 27, 4:33 AM CDT	Mesoscale Discussion	SPC	Adair, Barren, Boyle, Casey, Clinton, Cumberland and 12 more	57 min
Apr 27, 5:07 AM CDT	Tornado Watch	SPC	Adair, Allen, Anderson, Barren, Bourbon, Boyle and 28 more	5 hr
Apr 27, 7:34 AM CDT	Tornado Watch	SPC	Bath, Bell, Breathitt, Clay, Elliott, Estill and 21 more	4 hr
Apr 27, 8:39 AM CDT	Mesoscale Discussion	SPC	Boyd, Carter, Greenup, Lewis	66 min
Apr 27, 2:22 PM CDT	Mesoscale Discussion	SPC	Bell, Breathitt, Clay, Floyd, Harlan, Jackson and 11 more	83 min
Apr 27, 2:26 AM CDT	Tornado Watch	SPC	Franklin, Lincoln, Moore	6 hr
Apr 27, 8:08 AM CDT	Tornado Watch	SPC	Franklin, Lincoln, Moore	6 hr
Apr 27, 10:27 AM CDT	Tornado Watch	SPC	Anderson, Bedford, Bledsoe, Blount, Bradley, Cannon and 29 more	6 hr
Apr 27, 11:39 AM CDT	Mesoscale Discussion	SPC	Bledsoe, Blount, Bradley, Cannon, Coffee, DeKalb and 16 more	66 min
Apr 27, 12:08 PM CDT	Mesoscale Discussion	SPC	Benton, Carroll, Cheatham, Chester, Crockett, Decatur and 21 more	67 min
Apr 27, 1:03 PM CDT	Mesoscale Discussion	SPC	Bledsoe, Blount, Bradley, Grundy, Hamilton, Loudon and 10 more	57 min
Apr 27, 1:05 PM CDT	Mesoscale Discussion	SPC	Franklin, Giles, Lawrence, Lincoln, Marshall, Maury and 1 more	85 min
Apr 27, 1:42 PM CDT	Tornado Watch PDS	SPC	Franklin, Lincoln, Moore	8 hr
Apr 27, 2:56 PM CDT	Mesoscale Discussion	SPC	Franklin, Lincoln, Marion	2 hr
Apr 27, 3:36 PM CDT	Tornado Watch PDS	SPC	Anderson, Bedford, Benton, Bledsoe, Blount, Bradley and 66 more	8 hr
Apr 27, 5:38 PM CDT	Mesoscale Discussion	SPC	Anderson, Bedford, Bledsoe, Blount, Bradley, Cannon and 36 more	97 min

Nearby

Mesoscale Discussions in Kentucky, 2011 Mesoscale Discussions in Tennessee, 2011 Mesoscale Discussions in Illinois, 2011 Every mesoscale discussion in 2011

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.