Alert archive / West Virginia / Mesoscale Discussions in 2018

Mesoscale Discussion 212

April 3, 20185 states

The Storm Prediction Center issued this mesoscale discussion at Apr 3, 2018, 6:38 PM EDT for 5 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 3, 2018, 6:38 PM EDT (22:38 UTC)
Expired: Apr 3, 2018, 8:45 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 92 counties

Bath County, KY, Bourbon County, KY, Boyd County, KY, Carter County, KY, Clark County, KY, Elliott County, KY, Fleming County, KY, Greenup County, KY, Johnson County, KY, Lawrence County, KY, Lewis County, KY, Menifee County, KY, Montgomery County, KY, Morgan County, KY, Nicholas County, KY, Powell County, KY, Rowan County, KY, Wolfe County, KY, Allegany County, MD, Garrett County, MD, Athens County, OH, Belmont County, OH, Columbiana County, OH, Gallia County, OH, Guernsey County, OH, Harrison County, OH, Jackson County, OH, Jefferson County, OH, Lawrence County, OH, Meigs County, OH, Monroe County, OH, Morgan County, OH, Noble County, OH, Scioto County, OH, Vinton County, OH, Washington County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Bedford County, PA, Blair County, PA, Butler County, PA, Cambria County, PA, Clarion County, PA, Clearfield County, PA, Fayette County, PA, Greene County, PA, Huntingdon County, PA, Indiana County, PA, Jefferson County, PA, Lawrence County, PA, Somerset County, PA, Venango County, PA, Washington County, PA, Westmoreland County, PA, Barbour County, WV, Braxton County, WV, Brooke County, WV, Cabell County, WV, Calhoun County, WV, Clay County, WV, Doddridge County, WV, Gilmer County, WV, Grant County, WV, Hancock County, WV, Harrison County, WV, Jackson County, WV, Kanawha County, WV, Lewis County, WV, Lincoln County, WV, Marion County, WV, Marshall County, WV, Mason County, WV, Mineral County, WV, Monongalia County, WV, Nicholas County, WV, Ohio County, WV, Pleasants County, WV, Preston County, WV, Putnam County, WV, Randolph County, WV, Ritchie County, WV, Roane County, WV, Taylor County, WV, Tucker County, WV, Tyler County, WV, Upshur County, WV, Wayne County, WV, Webster County, WV, Wetzel County, WV, Wirt County, WV, Wood County, WV

The radar

The Pittsburgh radar (KPBZ), 98 km from the middle of the area, began a volume at 22:39 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

Pittsburgh, PA (KAGC), launched 12:00Z, 10.6 hours before the alert went out and 94 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: 458 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 291 m²/s²
0-3 km storm-relative helicity: 271 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 3, 12:41 PM EDT	Mesoscale Discussion	SPC	Boone, Breckinridge, Bullitt, Campbell, Carroll, Daviess and 12 more	3 hr
Apr 3, 1:16 PM EDT	Tornado Watch	SPC	Boone, Bourbon, Bracken, Campbell, Carroll, Daviess and 20 more	6 hr
Apr 3, 1:57 PM EDT	Mesoscale Discussion	SPC	Ballard, Carlisle, Crittenden, Fulton, Graves, Hickman and 4 more	2 hr
Apr 3, 2:33 PM EDT	Tornado Watch	SPC	Ballard, Caldwell, Calloway, Carlisle, Crittenden, Daviess and 13 more	7 hr
Apr 3, 4:18 PM EDT	Mesoscale Discussion	SPC	Boone, Bracken, Bullitt, Campbell, Carroll, Franklin and 17 more	117 min
Apr 3, 4:34 PM EDT	Mesoscale Discussion	SPC	Ballard, Carlisle, Crittenden, Fulton, Graves, Hickman and 4 more	86 min
Apr 3, 7:07 PM EDT	Severe Thunderstorm Watch	SPC	Boyd, Carter, Greenup, Lawrence	6 hr
Apr 3, 7:30 PM EDT	Tornado Watch	SPC	Adair, Allen, Anderson, Barren, Bath, Boone and 62 more	5 hr

Nearby

Mesoscale Discussions in West Virginia, 2018 Mesoscale Discussions in Pennsylvania, 2018 Mesoscale Discussions in Kentucky, 2018 Every mesoscale discussion 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.