Alert archive / Virginia / Mesoscale Discussions in 2016

Mesoscale Discussion 1208

July 8, 20164 states

The Storm Prediction Center issued this mesoscale discussion at Jul 8, 2016, 3:32 PM EDT for 4 states. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Jul 8, 2016, 3:32 PM EDT (19:32 UTC)
Expired: Jul 8, 2016, 5:00 PM EDT
In force: 88 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 46 counties

Alexander County, NC, Alleghany County, NC, Ashe County, NC, Avery County, NC, Burke County, NC, Caldwell County, NC, Davie County, NC, Forsyth County, NC, Iredell County, NC, McDowell County, NC, Mitchell County, NC, Rockingham County, NC, Stokes County, NC, Surry County, NC, Watauga County, NC, Wilkes County, NC, Yadkin County, NC, Yancey County, NC, Johnson County, TN, Alleghany County, VA, Bedford County, VA, Bland County, VA, Botetourt County, VA, Carroll County, VA, City of Covington, VA, City of Danville, VA, City of Galax, VA, City of Martinsville, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, Craig County, VA, Floyd County, VA, Franklin County, VA, Giles County, VA, Grayson County, VA, Henry County, VA, Montgomery County, VA, Patrick County, VA, Pittsylvania County, VA, Pulaski County, VA, Roanoke County, VA, Wythe County, VA, Greenbrier County, WV, Monroe County, WV, Summers County, WV

The radar

The Roanoke radar (KFCX), 42 km from the middle of the area, began a volume at 19:34 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

Roanoke, VA (KRNK), launched 12:00Z, 7.5 hours before the alert went out and 113 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: 163 J/kg
Mixed-layer CIN: -186 J/kg
Mixed-layer LCL: 898 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 201 m²/s²
0-3 km storm-relative helicity: 181 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
Jul 8, 3:53 PM EDT	Severe Thunderstorm Watch	SPC	Alleghany, Ashe, Caswell, Rockingham, Stokes, Surry and 3 more	5 hr
Jul 8, 5:48 PM EDT	Mesoscale Discussion	SPC	Alamance, Alexander, Buncombe, Burke, Cabarrus, Caldwell and 49 more	57 min
Jul 8, 6:15 PM EDT	Severe Thunderstorm Watch	SPC	Alamance, Alexander, Anson, Avery, Beaufort, Bertie and 68 more	6 hr
Jul 8, 6:48 PM EDT	Mesoscale Discussion	SPC	Alexander, Avery, Caldwell, Davie, Iredell, Watauga and 2 more	57 min
Jul 8, 7:36 PM EDT	Mesoscale Discussion	SPC	Clay	24 min
Jul 8, 1:01 PM EDT	Mesoscale Discussion	SPC	Anderson, Bledsoe, Blount, Campbell, Claiborne, Cocke and 31 more	59 min
Jul 8, 1:34 PM EDT	Severe Thunderstorm Watch	SPC	Anderson, Bedford, Bledsoe, Blount, Campbell, Cannon and 50 more	7 hr
Jul 8, 2:59 PM EDT	Mesoscale Discussion	SPC	Benton, Carroll, Chester, Crockett, Dyer, Gibson and 10 more	2 hr
Jul 8, 3:26 PM EDT	Severe Thunderstorm Watch	SPC	Chester, Crockett, Dyer, Fayette, Gibson, Hardeman and 9 more	5 hr
Jul 8, 3:49 PM EDT	Mesoscale Discussion	SPC	Anderson, Bedford, Bledsoe, Blount, Campbell, Cannon and 41 more	56 min
Jul 8, 5:42 PM EDT	Mesoscale Discussion	SPC	Carroll, Chester, Crockett, Dyer, Gibson, Haywood and 6 more	63 min

Nearby

Mesoscale Discussions in Virginia, 2016 Mesoscale Discussions in North Carolina, 2016 Mesoscale Discussions in West Virginia, 2016 Every mesoscale discussion in 2016

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.