Alert archive / West Virginia / Mesoscale Discussions in 2011

Mesoscale Discussion 414

April 11, 20115 states

The Storm Prediction Center issued this mesoscale discussion at Apr 11, 2011, 3:44 PM EDT for 5 states. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued: Apr 11, 2011, 3:44 PM EDT (19:44 UTC)
Expired: Apr 11, 2011, 4:45 PM EDT
In force: 61 min
Issued by: the Storm Prediction Center

All 90 counties

Bath County, KY, Bell County, KY, Boyd County, KY, Breathitt County, KY, Carter County, KY, Clay County, KY, Elliott County, KY, Estill County, KY, Fleming County, KY, Floyd County, KY, Greenup County, KY, Harlan County, KY, Jackson County, KY, Johnson County, KY, Knott County, KY, Knox County, KY, Laurel County, KY, Lawrence County, KY, Lee County, KY, Leslie County, KY, Letcher County, KY, Magoffin County, KY, Martin County, KY, McCreary County, KY, Menifee County, KY, Montgomery County, KY, Morgan County, KY, Owsley County, KY, Perry County, KY, Pike County, KY, Powell County, KY, Pulaski County, KY, Rockcastle County, KY, Rowan County, KY, Wayne County, KY, Whitley County, KY, Wolfe County, KY, Garrett County, MD, Athens County, OH, Gallia County, OH, Lawrence County, OH, Meigs County, OH, Washington County, OH, Buchanan County, VA, City of Bristol, VA, City of Norton, VA, Dickenson County, VA, Lee County, VA, Russell County, VA, Scott County, VA, Washington County, VA, Wise County, VA, Barbour County, WV, Boone County, WV, Braxton County, WV, Cabell County, WV, Calhoun County, WV, Clay County, WV, Doddridge County, WV, Fayette County, WV, Gilmer County, WV, Harrison County, WV, Jackson County, WV, Kanawha County, WV, Lewis County, WV, Lincoln County, WV, Logan County, WV, Marion County, WV, Mason County, WV, McDowell County, WV, Mingo County, WV, Monongalia County, WV, Nicholas County, WV, Pleasants County, WV, Preston County, WV, Putnam County, WV, Raleigh 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, Wyoming County, WV

The radar

The Charleston,WV radar (KRLX), 41 km from the middle of the area, began a volume at 19:45 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 131Apr 11, 6:10 PM EDT

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 7.7 hours before the alert went out and 207 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: 513 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 893 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 318 m²/s²
0-3 km storm-relative helicity: 339 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 8.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 11, 9:58 AM EDT	Mesoscale Discussion	SPC	Adair, Allen, Anderson, Barren, Bourbon, Boyle and 37 more	62 min
Apr 11, 11:31 AM EDT	Tornado Watch	SPC	Adair, Allen, Anderson, Barren, Bourbon, Boyle and 26 more	6 hr
Apr 11, 11:41 AM EDT	Mesoscale Discussion	SPC	Adair, Allen, Barren, Casey, Clinton, Cumberland and 8 more	64 min
Apr 11, 12:24 PM EDT	Mesoscale Discussion	SPC	Boyd, Breathitt, Carter, Clay, Elliott, Estill and 19 more	36 min
Apr 11, 12:47 PM EDT	Tornado Watch	SPC	Bath, Bell, Boyd, Breathitt, Carter, Clay and 31 more	6 hr
Apr 11, 1:37 PM EDT	Mesoscale Discussion	SPC	Adair, Allen, Anderson, Barren, Bourbon, Boyle and 31 more	53 min
Apr 11, 6:11 PM EDT	Tornado Watch	SPC	Adair, Bell, Breathitt, Casey, Clay, Clinton and 18 more	7 hr
Apr 11, 6:43 PM EDT	Mesoscale Discussion	SPC	Carroll	62 min
Apr 11, 1:48 AM EDT	Mesoscale Discussion	SPC	Defiance, Williams	87 min

Nearby

Mesoscale Discussions in West Virginia, 2011 Mesoscale Discussions in Kentucky, 2011 Mesoscale Discussions in Virginia, 2011 Every mesoscale discussion in 2011

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.