Alert archive / West Virginia / Mesoscale Discussions in 2012

Mesoscale Discussion 1210

June 18, 201213 counties in Ohio; 17 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Jun 18, 2012, 6:13 PM EDT for 13 counties in Ohio; 17 counties in West Virginia. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Jun 18, 2012, 6:13 PM EDT (22:13 UTC)
Expired: Jun 18, 2012, 7:45 PM EDT
In force: 92 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

All 30 counties

Athens County, OH, Belmont County, OH, Gallia County, OH, Guernsey County, OH, Hocking County, OH, Meigs County, OH, Monroe County, OH, Morgan County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Vinton County, OH, Washington County, OH, Braxton County, WV, Calhoun County, WV, Doddridge County, WV, Gilmer County, WV, Harrison County, WV, Jackson County, WV, Lewis County, WV, Marshall County, WV, Mason County, WV, Ohio County, WV, Pleasants County, WV, Ritchie County, WV, Roane County, WV, Tyler County, WV, Wetzel County, WV, Wirt County, WV, Wood County, WV

The radar

The Charleston,WV radar (KRLX), 138 km from the middle of the area, began a volume at 22:14 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

Pittsburgh, PA (KPIT), launched 12:00Z, 10.2 hours before the alert went out and 154 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: 308 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 567 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 41 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 18, 10:33 AM EDT	Mesoscale Discussion	SPC	Fulton, Lucas	2 hr
Jun 18, 1:38 PM EDT	Mesoscale Discussion	SPC	Ashland, Carroll, Coshocton, Crawford, Cuyahoga, Erie and 20 more	67 min

Nearby

Mesoscale Discussions in West Virginia, 2012 Mesoscale Discussions in Ohio, 2012 Every mesoscale discussion in 2012

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.