Alert archive / Tennessee / Severe Thunderstorm Watches in 2003

Severe Thunderstorm Watch 139

April 20, 20036 counties in Illinois; 28 counties in Kentucky; 32 counties in Tennessee

The Storm Prediction Center issued this severe thunderstorm watch at Apr 20, 2003, 1:45 PM CDT for 6 counties in Illinois; 28 counties in Kentucky; 32 counties in Tennessee. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Apr 20, 2003, 1:45 PM CDT (18:45 UTC)
Expired: Apr 20, 2003, 7:00 PM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 66 counties

Gallatin County, IL, Hardin County, IL, Johnson County, IL, Massac County, IL, Pope County, IL, Saline County, IL, Ballard 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, 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, Muhlenberg County, KY, Ohio County, KY, Todd County, KY, Trigg County, KY, Union County, KY, Webster County, KY, Benton County, TN, Carroll County, TN, Cheatham County, TN, Chester County, TN, Crockett County, TN, Decatur County, TN, Dickson County, TN, Dyer 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, Lake County, TN, Lauderdale County, TN, Lewis County, TN, Madison County, TN, McNairy County, TN, Montgomery County, TN, Obion County, TN, Perry County, TN, Robertson County, TN, Shelby County, TN, Stewart County, TN, Tipton County, TN, Wayne County, TN, Weakley County, TN

The radar

The Paducah radar (KPAH), 101 km from the middle of the area, began a volume at 18:45 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.

Warnings issued inside it

41 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Apr 20, 2:54 PM CDT	Severe Thunderstorm Warning	PAH	Caldwell	36 min
Apr 20, 2:59 PM CDT	Severe Thunderstorm Warning	PAH	Trigg	46 min
Apr 20, 3:05 PM CDT	Severe Thunderstorm Warning	MEG	Shelby	40 min
Apr 20, 3:26 PM CDT	Severe Thunderstorm Warning	MEG	Fayette	49 min
Apr 20, 3:28 PM CDT	Severe Thunderstorm Warning	PAH	Christian	32 min
Apr 20, 3:38 PM CDT	Tornado Warning	PAH	Christian	32 min
Apr 20, 3:38 PM CDT	Tornado Warning	MEG	Fayette	52 min
Apr 20, 3:43 PM CDT	Severe Thunderstorm Warning	MEG	Haywood, Lauderdale	62 min
Apr 20, 3:58 PM CDT	Tornado Warning	PAH	Muhlenberg	47 min
Apr 20, 4:15 PM CDT	Severe Thunderstorm Warning	LMK	Butler, Ohio	45 min
Apr 20, 4:18 PM CDT	Severe Thunderstorm Warning	MEG	Hardeman	42 min
Apr 20, 4:22 PM CDT	Severe Thunderstorm Warning	MEG	Crockett, Gibson	38 min
Apr 20, 4:32 PM CDT	Severe Thunderstorm Warning	PAH	Union	43 min
Apr 20, 4:44 PM CDT	Severe Thunderstorm Warning	MEG	Fayette	16 min
Apr 20, 4:52 PM CDT	Severe Thunderstorm Warning	PAH	Henderson	38 min
Apr 20, 4:52 PM CDT	Severe Thunderstorm Warning	MEG	Haywood	38 min
Apr 20, 4:53 PM CDT	Severe Thunderstorm Warning	MEG	McNairy	52 min
Apr 20, 4:54 PM CDT	Severe Thunderstorm Warning	LMK	Butler	21 min
Apr 20, 5:00 PM CDT	Tornado Warning	PAH	Henderson	30 min
Apr 20, 5:00 PM CDT	Tornado Warning	MEG	Carroll, Weakley	30 min
Apr 20, 5:04 PM CDT	Severe Thunderstorm Warning	LMK	Butler, Edmonson, Grayson	41 min
Apr 20, 5:07 PM CDT	Severe Thunderstorm Warning	PAH	Calloway	23 min
Apr 20, 5:22 PM CDT	Severe Thunderstorm Warning	MEG	Hardin	38 min
Apr 20, 5:27 PM CDT	Tornado Warning	PAH	Daviess	33 min
Apr 20, 5:34 PM CDT	Tornado Warning	MEG	Henry	26 min
Apr 20, 5:38 PM CDT	Severe Thunderstorm Warning	MEG	Carroll	37 min
Apr 20, 5:40 PM CDT	Severe Thunderstorm Warning	PAH	Trigg	35 min
Apr 20, 5:44 PM CDT	Severe Thunderstorm Warning	OHX	Wayne	46 min
Apr 20, 5:46 PM CDT	Severe Thunderstorm Warning	PAH	Henderson, Union, Webster	44 min
Apr 20, 5:47 PM CDT	Severe Thunderstorm Warning	OHX	Benton	28 min
Apr 20, 5:57 PM CDT	Severe Thunderstorm Warning	MEG	Tipton	48 min
Apr 20, 5:58 PM CDT	Severe Thunderstorm Warning	PAH	Christian	47 min
Apr 20, 5:59 PM CDT	Severe Thunderstorm Warning	LMK	Hancock	46 min
Apr 20, 6:00 PM CDT	Severe Thunderstorm Warning	LMK	Hancock	45 min
Apr 20, 6:26 PM CDT	Severe Thunderstorm Warning	OHX	Lawrence, Wayne	49 min
Apr 20, 6:27 PM CDT	Severe Thunderstorm Warning	OHX	Houston, Humphreys	48 min
Apr 20, 6:28 PM CDT	Severe Thunderstorm Warning	PAH	Daviess	32 min
Apr 20, 6:36 PM CDT	Severe Thunderstorm Warning	LMK	Breckinridge, Meade	19 min
Apr 20, 6:37 PM CDT	Severe Thunderstorm Warning	MEG	Lauderdale	23 min
Apr 20, 6:47 PM CDT	Tornado Warning	MEG	Lauderdale	28 min
Apr 20, 6:51 PM CDT	Severe Thunderstorm Warning	LMK	Hancock	29 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 6.8 hours before the alert went out and 173 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: 706 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 255 m²/s²
0-3 km storm-relative helicity: 229 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 20, 1:25 AM CDT	Mesoscale Discussion	SPC	Clinton, Jackson, Monroe, Perry, Randolph, Saint Clair and 1 more	2 hr
Apr 20, 1:50 AM CDT	Severe Thunderstorm Watch	SPC	Jackson, Monroe, Perry, Randolph, Washington	5 hr
Apr 20, 4:00 AM CDT	Mesoscale Discussion	SPC	Jackson, Monroe, Perry, Randolph, Washington	2 hr
Apr 20, 11:52 AM CDT	Mesoscale Discussion	SPC	Alexander, Clark, Clay, Coles, Crawford, Cumberland and 23 more	2 hr
Apr 20, 12:20 PM CDT	Severe Thunderstorm Watch	SPC	Clark, Crawford, Edgar, Edwards, Hamilton, Jasper and 6 more	6 hr
Apr 20, 1:00 PM CDT	Mesoscale Discussion	SPC	Gallatin, Hardin, Johnson, Massac, Pope, Pulaski and 1 more	3 hr
Apr 20, 3:15 PM CDT	Severe Thunderstorm Watch	SPC	Boone, Bracken, Campbell, Carroll, Gallatin, Grant and 8 more	6 hr
Apr 20, 3:29 PM CDT	Mesoscale Discussion	SPC	Adair, Allen, Anderson, Barren, Bath, Bourbon and 43 more	2 hr
Apr 20, 4:35 PM CDT	Tornado Watch	SPC	Adair, Allen, Anderson, Barren, Boyle, Breckinridge and 34 more	5 hr
Apr 20, 5:31 PM CDT	Mesoscale Discussion	SPC	Boone, Bracken, Campbell, Gallatin, Greenup, Kenton and 1 more	89 min
Apr 20, 6:04 PM CDT	Mesoscale Discussion	SPC	Adair, Anderson, Barren, Boyle, Breckinridge, Bullitt and 33 more	116 min
Apr 20, 6:25 PM CDT	Severe Thunderstorm Watch	SPC	Allen, Barren, Calloway, Christian, Graves, Logan and 5 more	6 hr

Nearby

Severe Thunderstorm Watches in Tennessee, 2003 Severe Thunderstorm Watches in Kentucky, 2003 Severe Thunderstorm Watches in Illinois, 2003 Every severe thunderstorm watch in 2003

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.