Alert archive / West Virginia / Mesoscale Discussions in 2019

Mesoscale Discussion 355

April 14, 201911 counties in Virginia; 24 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Apr 14, 2019, 8:31 PM EDT for 11 counties in Virginia; 24 counties in West Virginia. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Apr 14, 2019, 8:31 PM EDT (00:31 UTC)
Expired: Apr 14, 2019, 9:30 PM EDT
In force: 59 min
Issued by: the Storm Prediction Center

All 35 counties

Alleghany County, VA, Bland County, VA, City of Covington, VA, City of Radford, VA, Craig County, VA, Giles County, VA, Montgomery County, VA, Pulaski County, VA, Smyth County, VA, Tazewell County, VA, Wythe County, VA, Barbour County, WV, Braxton County, WV, Clay County, WV, Doddridge County, WV, Fayette County, WV, Gilmer County, WV, Greenbrier County, WV, Harrison County, WV, Lewis County, WV, Marion County, WV, McDowell County, WV, Mercer County, WV, Monroe County, WV, Nicholas County, WV, Pocahontas County, WV, Preston County, WV, Raleigh County, WV, Randolph County, WV, Summers County, WV, Taylor County, WV, Tucker County, WV, Upshur County, WV, Webster County, WV, Wyoming County, WV

The radar

The Charleston,WV radar (KRLX), 98 km from the middle of the area, began a volume at 00:32 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.

Tornado Watch 72Apr 14, 10:15 PM EDT

The nearest sounding before it

Roanoke, VA (KRNK), launched 00:00Z, 0.5 hours before the alert went out and 143 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: 215 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 874 m above ground
0-6 km bulk shear: 92 kt
0-1 km storm-relative helicity: 305 m²/s²
0-3 km storm-relative helicity: 332 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 7.2

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 14, 10:09 PM EDT	Mesoscale Discussion	SPC	Alleghany, Amherst, Appomattox, Bedford, Botetourt, Buckingham and 28 more	96 min
Apr 14, 10:14 PM EDT	Tornado Watch	SPC	Amherst, Appomattox, Bedford, Botetourt, Buckingham, Campbell and 19 more	6 hr
Apr 15, 12:07 AM EDT	Mesoscale Discussion	SPC	Amelia, Brunswick, Caroline, Charles City, Chesterfield, Cumberland and 40 more	113 min
Apr 15, 12:41 AM EDT	Tornado Watch	SPC	Accomack, Amelia, Brunswick, Caroline, Charles City, Chesterfield and 47 more	5 hr
Apr 15, 2:30 AM EDT	Mesoscale Discussion	SPC	Accomack, Brunswick, Charles City, Dinwiddie, Essex, Gloucester and 31 more	60 min

Nearby

Mesoscale Discussions in West Virginia, 2019 Mesoscale Discussions in Virginia, 2019 Every mesoscale discussion in 2019

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.