Alert archive / West Virginia / Mesoscale Discussions in 2015

Mesoscale Discussion 1208

June 27, 20159 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Jun 27, 2015, 12:39 AM EDT for 9 counties in West Virginia. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued: Jun 27, 2015, 12:39 AM EDT (04:39 UTC)
Expired: Jun 27, 2015, 1:45 AM EDT
In force: 66 min
Issued by: the Storm Prediction Center

Counties Boone County, WV, Fayette County, WV, Greenbrier County, WV, Mercer County, WV, Monroe County, WV, Nicholas County, WV, Raleigh County, WV, Summers County, WV, Wyoming County, WV

The radar

The Charleston,WV radar (KRLX), 82 km from the middle of the area, began a volume at 04:40 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, 4.7 hours before the alert went out and 151 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: 430 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 1414 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 115 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.6

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 26, 8:05 PM EDT	Mesoscale Discussion	SPC	Braxton, Cabell, Calhoun, Clay, Fayette, Gilmer and 11 more	85 min
Jun 26, 9:58 PM EDT	Mesoscale Discussion	SPC	Boone, Braxton, Cabell, Clay, Fayette, Greenbrier and 13 more	62 min

Nearby

Mesoscale Discussions in West Virginia, 2015 Every mesoscale discussion in 2015

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.