Alert archive / Virginia / Mesoscale Discussions in 2014

Mesoscale Discussion 824

June 4, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Jun 4, 2014, 10:45 PM EDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 4, 2014, 10:45 PM EDT (02:45 UTC)
Expired: Jun 5, 2014, 12:45 AM EDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 67 counties

Alleghany County, NC, Ashe County, NC, Avery County, NC, Burke County, NC, Caldwell County, NC, Madison County, NC, McDowell County, NC, Mitchell County, NC, Watauga County, NC, Wilkes County, NC, Yancey County, NC, Blount County, TN, Carter County, TN, Cocke County, TN, Grainger County, TN, Greene County, TN, Hamblen County, TN, Hancock County, TN, Hawkins County, TN, Jefferson County, TN, Johnson County, TN, Knox County, TN, Loudon County, TN, Sevier County, TN, Sullivan County, TN, Unicoi County, TN, Washington County, TN, Alleghany County, VA, Bath County, VA, Bland County, VA, Botetourt County, VA, Buchanan County, VA, Carroll County, VA, City of Bristol, VA, City of Buena Vista, VA, City of Covington, VA, City of Galax, VA, City of Lexington, VA, City of Norton, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, City of Waynesboro, VA, Craig County, VA, Dickenson County, VA, Floyd County, VA, Giles County, VA, Grayson County, VA, Montgomery County, VA, Pulaski County, VA, Roanoke County, VA, Rockbridge County, VA, Russell County, VA, Scott County, VA, Smyth County, VA, Tazewell County, VA, Washington County, VA, Wise County, VA, Wythe County, VA, Fayette County, WV, Greenbrier County, WV, McDowell County, WV, Mercer County, WV, Monroe County, WV, Raleigh County, WV, Summers County, WV, Wyoming County, WV

The radar

The Roanoke radar (KFCX), 60 km from the middle of the area, began a volume at 02:47 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

Roanoke, VA (KRNK), launched 00:00Z, 2.8 hours before the alert went out and 128 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: 1089 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 1162 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 123 m²/s²
0-3 km storm-relative helicity: 342 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.4

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
Jun 4, 8:00 PM EDT	Tornado Watch	SPC	Alexander, Alleghany, Ashe, Avery, Buncombe, Burke and 13 more	6 hr
Jun 5, 12:47 PM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Camden, Chowan, Craven, Currituck and 24 more	58 min
Jun 5, 1:21 PM EDT	Severe Thunderstorm Watch	SPC	Beaufort, Bladen, Brunswick, Carteret, Columbus, Craven and 21 more	7 hr
Jun 5, 3:48 PM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Bladen, Brunswick, Carteret, Chowan and 28 more	57 min
Jun 4, 8:24 PM EDT	Tornado Watch	SPC	Benton, Cannon, Carroll, Cheatham, Clay, Cumberland and 28 more	8 hr
Jun 5, 12:53 AM EDT	Mesoscale Discussion	SPC	Bedford, Benton, Bledsoe, Bradley, Cannon, Carroll and 46 more	97 min
Jun 5, 3:14 AM EDT	Mesoscale Discussion	SPC	Bedford, Coffee, Decatur, Franklin, Giles, Grundy and 8 more	91 min
Jun 5, 10:27 AM EDT	Mesoscale Discussion	SPC	Carroll, Chester, Crockett, Decatur, Dyer, Fayette and 14 more	63 min
Jun 5, 11:06 AM EDT	Severe Thunderstorm Watch	SPC	Benton, Carroll, Chester, Crockett, Decatur, Dyer and 15 more	7 hr
Jun 5, 2:22 PM EDT	Mesoscale Discussion	SPC	Benton, Carroll, Chester, Crockett, Decatur, Dyer and 16 more	53 min
Jun 5, 3:27 PM EDT	Severe Thunderstorm Watch	SPC	Bedford, Bledsoe, Bradley, Cannon, Cheatham, Coffee and 28 more	6 hr

Nearby

Mesoscale Discussions in Virginia, 2014 Mesoscale Discussions in Tennessee, 2014 Mesoscale Discussions in North Carolina, 2014 Every mesoscale discussion in 2014

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.