Alert archive / Kentucky / Severe Thunderstorm Watches in 2018

Severe Thunderstorm Watch 237

June 28, 20186 states

The Storm Prediction Center issued this severe thunderstorm watch at Jun 28, 2018, 5:33 PM CDT for 6 states. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Jun 28, 2018, 5:33 PM CDT (22:33 UTC)
Expired: Jun 29, 2018, 12:56 AM CDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1.5 in
Strongest gust expected: 60 kt

All 76 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, Jefferson County, IL, Johnson County, IL, Massac County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Saline County, IL, Union County, IL, Wabash County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Gibson County, IN, Pike County, IN, 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, Todd County, KY, Trigg County, KY, Union County, KY, Webster County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Dunklin County, MO, Iron County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Perry County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Scott County, MO, Stoddard County, MO, Washington County, MO, Wayne County, MO, 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), 19 km from the middle of the area, began a volume at 22:36 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes: 5%
One or more EF2 to EF5 tornadoes: 2%
Ten or more severe wind reports: 40%
One or more gusts of 65 knots or more: 10%
Ten or more severe hail reports: 20%
One or more hailstones of 2 inches or more: 10%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 28, 6:21 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Marion, Monroe, Randolph, Saint Clair, Washington	69 min
Jun 28, 6:25 PM CDT	Severe Thunderstorm Warning	PAH	Edwards, Franklin, Hamilton, Jackson, Jefferson, Perry and 3 more	65 min
Jun 28, 6:56 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Randolph	64 min
Jun 28, 7:00 PM CDT	Severe Thunderstorm Warning	PAH	Gallatin, Jackson, Johnson, Pope, Saline, Union and 1 more	60 min
Jun 28, 7:04 PM CDT	Tornado Warning	PAH	Franklin, Williamson	26 min
Jun 28, 7:09 PM CDT	Flash Flood Warning	PAH	Franklin, Perry	110 min
Jun 28, 7:25 PM CDT	Severe Thunderstorm Warning	PAH	Perry	35 min
Jun 28, 7:27 PM CDT	Flash Flood Warning	PAH	Jackson, Saline, Williamson	3 hr
Jun 28, 7:35 PM CDT	Severe Thunderstorm Warning	PAH	Gallatin, Hardin, Johnson, Massac, Pope, Pulaski	40 min
Jun 28, 7:40 PM CDT	Severe Thunderstorm Warning	PAH	Gallatin, White	35 min
Jun 28, 7:43 PM CDT	Severe Thunderstorm Warning	PAH	Union	32 min
Jun 28, 7:55 PM CDT	Severe Thunderstorm Warning	PAH	Alexander	37 min
Jun 28, 8:05 PM CDT	Severe Thunderstorm Warning	PAH	Caldwell, Calloway, Christian, Graves, Hopkins, Livingston and 4 more	55 min
Jun 28, 8:07 PM CDT	Flash Flood Warning	LSX	Monroe, Randolph	6 hr
Jun 28, 8:14 PM CDT	Severe Thunderstorm Warning	PAH	Alexander, Massac, Pope, Pulaski	20 min
Jun 28, 8:18 PM CDT	Severe Thunderstorm Warning	PAH	Carlisle, Fulton, Hickman	42 min
Jun 28, 8:36 PM CDT	Severe Thunderstorm Warning	MEG	Benton, Dyer, Gibson, Henry, Lake, Obion and 1 more	54 min
Jun 28, 8:39 PM CDT	Severe Thunderstorm Warning	PAH	Christian, Hopkins, Muhlenberg, Todd, Trigg	66 min
Jun 28, 8:40 PM CDT	Flash Flood Warning	PAH	Alexander, Massac, Pulaski, Union	71 min
Jun 28, 8:51 PM CDT	Flash Flood Warning	LSX	Sainte Genevieve, Saint Francois	6 hr
Jun 28, 9:11 PM CDT	Severe Thunderstorm Warning	MEG	Benton, Carroll, Gibson, Henry, Weakley	49 min
Jun 28, 9:22 PM CDT	Severe Thunderstorm Warning	MEG	Pemiscot	68 min
Jun 28, 9:27 PM CDT	Severe Thunderstorm Warning	MEG	Benton, Henry, Obion, Weakley	33 min
Jun 28, 9:55 PM CDT	Severe Thunderstorm Warning	MEG	Benton, Carroll, Crockett, Decatur, Gibson, Henderson and 4 more	65 min
Jun 28, 10:01 PM CDT	Severe Thunderstorm Warning	MEG	Mississippi	59 min
Jun 28, 10:13 PM CDT	Severe Thunderstorm Warning	MEG	Mississippi	62 min
Jun 28, 10:27 PM CDT	Severe Thunderstorm Warning	MEG	Carroll, Chester, Crockett, Decatur, Gibson, Hardeman and 4 more	48 min
Jun 28, 10:54 PM CDT	Severe Thunderstorm Warning	MEG	Clay, Greene, Lawrence, Randolph	66 min
Jun 28, 11:24 PM CDT	Severe Thunderstorm Warning	MEG	Craighead, Greene, Lawrence, Poinsett, Randolph	51 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, 10.6 hours before the alert went out and 218 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: 2274 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 1063 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 195 m²/s²
0-3 km storm-relative helicity: 251 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 11.7

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 28, 2:00 AM CDT	Mesoscale Discussion	SPC	Alexander, Bond, Calhoun, Clinton, Franklin, Gallatin and 20 more	3 hr
Jun 28, 8:43 AM CDT	Mesoscale Discussion	SPC	Alexander, Bond, Calhoun, Clinton, Edwards, Franklin and 24 more	62 min
Jun 28, 10:57 AM CDT	Mesoscale Discussion	SPC	Adams, Brown, Hancock, Pike, Scott	2 hr
Jun 28, 1:04 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Bond, Brown, Calhoun, Cass, Christian and 28 more	7 hr
Jun 28, 3:34 PM CDT	Mesoscale Discussion	SPC	Adams, Bond, Brown, Calhoun, Cass, Christian and 47 more	116 min
Jun 28, 10:22 AM CDT	Mesoscale Discussion	SPC	Calloway, Graves	113 min
Jun 28, 7:20 AM CDT	Mesoscale Discussion	SPC	Atchison, Holt, Nodaway	2 hr
Jun 28, 10:46 AM CDT	Severe Thunderstorm Watch	SPC	Bedford, Benton, Carroll, Chester, Coffee, Crockett and 25 more	8 hr
Jun 28, 1:07 PM CDT	Mesoscale Discussion	SPC	Giles, Lawrence, Lewis, Lincoln, Wayne	113 min

Nearby

Severe Thunderstorm Watches in Kentucky, 2018 Severe Thunderstorm Watches in Illinois, 2018 Severe Thunderstorm Watches in Missouri, 2018 Every severe thunderstorm watch in 2018

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.