Alert archive / Kentucky / Mesoscale Discussions in 2020

Mesoscale Discussion 308

April 8, 20204 states

The Storm Prediction Center issued this mesoscale discussion at Apr 8, 2020, 12:39 PM EDT for 4 states. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Apr 8, 2020, 12:39 PM EDT (16:39 UTC)
Expired: Apr 8, 2020, 2:15 PM EDT
In force: 96 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 57 counties

Bath County, KY, Boyd County, KY, Bracken County, KY, Campbell County, KY, Carter County, KY, Elliott County, KY, Fleming County, KY, Floyd County, KY, Gallatin County, KY, Grant County, KY, Greenup County, KY, Harrison County, KY, Johnson County, KY, Kenton County, KY, Lawrence County, KY, Lewis County, KY, Magoffin County, KY, Martin County, KY, Mason County, KY, Morgan County, KY, Nicholas County, KY, Pendleton County, KY, Pike County, KY, Robertson County, KY, Rowan County, KY, Adams County, OH, Brown County, OH, Clermont County, OH, Gallia County, OH, Lawrence County, OH, Scioto County, OH, Bland County, VA, Buchanan County, VA, City of Radford, VA, Craig County, VA, Giles County, VA, Montgomery County, VA, Pulaski County, VA, Roanoke County, VA, Tazewell County, VA, Boone County, WV, Cabell County, WV, Fayette County, WV, Greenbrier County, WV, Kanawha County, WV, Lincoln County, WV, Logan County, WV, McDowell County, WV, Mercer County, WV, Mingo County, WV, Monroe County, WV, Nicholas County, WV, Putnam County, WV, Raleigh County, WV, Summers County, WV, Wayne County, WV, Wyoming County, WV

The radar

The Charleston,WV radar (KRLX), 59 km from the middle of the area, began a volume at 16:40 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.

Severe Thunderstorm Watch 87Apr 8, 1:10 PM EDT

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 4.7 hours before the alert went out and 194 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: 1055 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 756 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 8, 1:10 PM EDT	Severe Thunderstorm Watch	SPC	Bath, Bourbon, Boyd, Bracken, Carter, Elliott and 21 more	7 hr
Apr 8, 4:05 PM EDT	Mesoscale Discussion	SPC	Bath, Breathitt, Elliott, Floyd, Johnson, Knott and 10 more	85 min
Apr 8, 4:45 PM EDT	Mesoscale Discussion	SPC	Ballard, Carlisle, McCracken	2 hr
Apr 8, 5:24 PM EDT	Tornado Watch	SPC	Ballard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more	7 hr
Apr 8, 6:52 PM EDT	Mesoscale Discussion	SPC	Adair, Allen, Anderson, Barren, Bath, Boone and 65 more	2 hr
Apr 8, 7:24 PM EDT	Tornado Watch	SPC	Adair, Allen, Anderson, Barren, Boone, Bourbon and 55 more	5 hr
Apr 7, 9:07 PM EDT	Severe Thunderstorm Watch	SPC	Allen, Ashland, Ashtabula, Auglaize, Crawford, Cuyahoga and 33 more	6 hr
Apr 7, 10:04 PM EDT	Mesoscale Discussion	SPC	Allen, Ashland, Ashtabula, Auglaize, Carroll, Columbiana and 42 more	86 min
Apr 7, 11:40 PM EDT	Severe Thunderstorm Watch	SPC	Athens, Belmont, Carroll, Champaign, Clark, Columbiana and 31 more	6 hr
Apr 8, 1:52 AM EDT	Mesoscale Discussion	SPC	Belmont, Guernsey, Harrison, Monroe, Noble, Washington	83 min
Apr 8, 3:16 AM EDT	Mesoscale Discussion	SPC	Athens, Clark, Clinton, Fairfield, Fayette, Gallia and 15 more	89 min
Apr 8, 5:30 AM EDT	Mesoscale Discussion	SPC	Fayette, Gallia, Highland, Jackson, Meigs, Pike and 2 more	30 min
Apr 8, 2:14 AM EDT	Severe Thunderstorm Watch	SPC	Frederick, City of Winchester	2 hr
Apr 8, 3:53 AM EDT	Mesoscale Discussion	SPC	Arlington, Clarke, Fairfax, Fauquier, Frederick, Loudoun and 11 more	97 min
Apr 8, 6:06 PM EDT	Mesoscale Discussion	SPC	City of Danville	84 min

Nearby

Mesoscale Discussions in Kentucky, 2020 Mesoscale Discussions in West Virginia, 2020 Mesoscale Discussions in Virginia, 2020 Every mesoscale discussion in 2020

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.