Alert archive / West Virginia / Mesoscale Discussions in 2017

Mesoscale Discussion 1395

July 22, 2017Greenup County, Kentucky; 23 counties in Ohio; 25 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Jul 22, 2017, 3:18 PM EDT for Greenup County, Kentucky; 23 counties in Ohio; 25 counties in West Virginia. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 22, 2017, 3:18 PM EDT (19:18 UTC)
Expired: Jul 22, 2017, 5:45 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 49 counties

Greenup County, KY, Adams County, OH, Athens County, OH, Clinton County, OH, Fairfield County, OH, Fayette County, OH, Gallia County, OH, Greene County, OH, Highland County, OH, Hocking County, OH, Jackson County, OH, Lawrence County, OH, Madison County, OH, Meigs County, OH, Morgan County, OH, Noble County, OH, Perry County, OH, Pickaway County, OH, Pike County, OH, Ross County, OH, Scioto County, OH, Vinton County, OH, Warren County, OH, Washington County, OH, Barbour County, WV, Braxton County, WV, Calhoun County, WV, Clay County, WV, Doddridge County, WV, Gilmer County, WV, Harrison County, WV, Jackson County, WV, Kanawha County, WV, Lewis County, WV, Mason County, WV, Pleasants County, WV, Pocahontas County, WV, Putnam County, WV, Randolph County, WV, Ritchie County, WV, Roane County, WV, Taylor County, WV, Tucker County, WV, Tyler County, WV, Upshur County, WV, Webster County, WV, Wetzel County, WV, Wirt County, WV, Wood County, WV

The radar

The Charleston,WV radar (KRLX), 94 km from the middle of the area, began a volume at 19:19 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.

Severe Thunderstorm Watch 432Jul 22, 3:55 PM EDT

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 7.3 hours before the alert went out and 150 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: 809 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 691 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 45 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.8

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 22, 5:00 AM EDT	Mesoscale Discussion	SPC	Butler, Darke, Greene, Hamilton, Miami, Montgomery and 2 more	90 min
Jul 22, 8:34 AM EDT	Mesoscale Discussion	SPC	Belmont, Carroll, Columbiana, Harrison, Jefferson, Monroe and 2 more	86 min
Jul 22, 3:54 PM EDT	Severe Thunderstorm Watch	SPC	Athens, Fairfield, Fayette, Franklin, Gallia, Hocking and 11 more	6 hr
Jul 22, 7:37 PM EDT	Mesoscale Discussion	SPC	Adams, Athens, Gallia, Highland, Jackson, Lawrence and 5 more	83 min

Nearby

Mesoscale Discussions in West Virginia, 2017 Mesoscale Discussions in Ohio, 2017 Mesoscale Discussions in Kentucky, 2017 Every mesoscale discussion in 2017

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.