Alert archive / Ohio / Mesoscale Discussions in 2011

Mesoscale Discussion 1655

July 18, 201133 counties in Ohio; 22 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Jul 18, 2011, 6:14 PM EDT for 33 counties in Ohio; 22 counties in West Virginia. It was in force for 31 min.

The area

The outline as issued.

The facts

Issued: Jul 18, 2011, 6:14 PM EDT (22:14 UTC)
Expired: Jul 18, 2011, 6:45 PM EDT
In force: 31 min
Issued by: the Storm Prediction Center

All 55 counties

Athens County, OH, Champaign County, OH, Clark County, OH, Crawford County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Gallia County, OH, Hancock County, OH, Hardin County, OH, Hocking County, OH, Jackson County, OH, Knox County, OH, Lawrence County, OH, Licking County, OH, Logan County, OH, Madison County, OH, Marion County, OH, Meigs County, OH, Monroe County, OH, Morgan County, OH, Morrow County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Pickaway County, OH, Pike County, OH, Ross County, OH, Union County, OH, Vinton County, OH, Washington County, OH, Wyandot County, OH, Braxton County, WV, Cabell County, WV, Calhoun County, WV, Clay County, WV, Doddridge County, WV, Fayette County, WV, Gilmer County, WV, Harrison County, WV, Jackson County, WV, Kanawha County, WV, Lewis County, WV, Mason County, WV, Nicholas County, WV, Pleasants County, WV, Putnam County, WV, Ritchie County, WV, Roane County, WV, Tyler County, WV, Upshur County, WV, Webster County, WV, Wirt County, WV, Wood County, WV

The radar

The Cincinnati radar (KILN), 117 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 660Jul 18, 6:25 PM EDT

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 10.2 hours before the alert went out and 115 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: 1057 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 878 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 22 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.1

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
Jul 18, 1:18 PM EDT	Mesoscale Discussion	SPC	Ashland, Carroll, Columbiana, Coshocton, Crawford, Cuyahoga and 27 more	117 min
Jul 18, 3:57 PM EDT	Severe Thunderstorm Watch	SPC	Ashland, Ashtabula, Belmont, Carroll, Columbiana, Coshocton and 33 more	6 hr
Jul 18, 6:26 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Athens, Brown, Champaign, Clark, Clinton and 23 more	4 hr

Nearby

Mesoscale Discussions in Ohio, 2011 Mesoscale Discussions in West Virginia, 2011 Every mesoscale discussion in 2011

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.