Alert archive / West Virginia / Mesoscale Discussions in 2020

Mesoscale Discussion 307

April 8, 20208 counties in Ohio; Bath County, Highland County, Virginia; 9 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Apr 8, 2020, 5:30 AM EDT for 8 counties in Ohio; Bath County, Highland County, Virginia; 9 counties in West Virginia. It was in force for 30 min.

The area

The outline as issued.

The facts

Issued: Apr 8, 2020, 5:30 AM EDT (09:30 UTC)
Expired: Apr 8, 2020, 6:00 AM EDT
In force: 30 min
Issued by: the Storm Prediction Center

Counties Fayette County, OH, Gallia County, OH, Highland County, OH, Jackson County, OH, Meigs County, OH, Pike County, OH, Ross County, OH, Vinton County, OH, Bath County, VA, Highland County, VA, Clay County, WV, Jackson County, WV, Kanawha County, WV, Mason County, WV, Nicholas County, WV, Pocahontas County, WV, Putnam County, WV, Roane County, WV, Webster County, WV

The radar

The Charleston,WV radar (KRLX), 60 km from the middle of the area, began a volume at 09:30 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

Pittsburgh, PA (KPIT), launched 00:00Z, 9.5 hours before the alert went out and 212 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: 43 J/kg
Mixed-layer CIN: -141 J/kg
Mixed-layer LCL: 1005 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 346 m²/s²
0-3 km storm-relative helicity: 427 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 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, 12:39 PM EDT	Mesoscale Discussion	SPC	Adams, Brown, Clermont, Gallia, Lawrence, Scioto	96 min
Apr 8, 1:10 PM EDT	Severe Thunderstorm Watch	SPC	Lawrence	7 hr
Apr 8, 6:52 PM EDT	Mesoscale Discussion	SPC	Adams, Brown, Butler, Clark, Clermont, Clinton and 13 more	2 hr
Apr 8, 7:24 PM EDT	Tornado Watch	SPC	Adams, Brown, Butler, Clermont, Clinton, Fayette and 9 more	5 hr
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, 4:05 PM EDT	Mesoscale Discussion	SPC	Bedford, Bland, Buchanan, Carroll, Craig, Dickenson and 20 more	85 min
Apr 8, 6:06 PM EDT	Mesoscale Discussion	SPC	City of Danville	84 min

Nearby

Mesoscale Discussions in West Virginia, 2020 Mesoscale Discussions in Ohio, 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.