Alert archive / Ohio / Mesoscale Discussions in 2011

Mesoscale Discussion 1886

August 7, 20117 counties in Indiana; 36 counties in Ohio; 4 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Aug 7, 2011, 4:01 PM EDT for 7 counties in Indiana; 36 counties in Ohio; 4 counties in West Virginia. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Aug 7, 2011, 4:01 PM EDT (20:01 UTC)
Expired: Aug 7, 2011, 6:00 PM EDT
In force: 119 min
Issued by: the Storm Prediction Center

All 47 counties

Fayette County, IN, Franklin County, IN, Hancock County, IN, Henry County, IN, Rush County, IN, Union County, IN, Wayne County, IN, Athens County, OH, Belmont County, OH, Butler County, OH, Champaign County, OH, Clark County, OH, Clinton County, OH, Darke County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Greene County, OH, Guernsey County, OH, Highland County, OH, Hocking County, OH, Jackson County, OH, Licking County, OH, Logan County, OH, Madison County, OH, Meigs County, OH, Miami County, OH, Monroe County, OH, Montgomery County, OH, Morgan County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Pickaway County, OH, Pike County, OH, Preble County, OH, Ross County, OH, Shelby County, OH, Union County, OH, Vinton County, OH, Warren County, OH, Washington County, OH, Jackson County, WV, Pleasants County, WV, Tyler County, WV, Wood County, WV

The radar

The Cincinnati radar (KILN), 55 km from the middle of the area, began a volume at 20:01 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 738Aug 7, 5:50 PM EDT

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 8.0 hours before the alert went out and 53 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: 1233 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 540 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: -20 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.6

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
Aug 7, 12:14 PM EDT	Mesoscale Discussion	SPC	Adams, Allen, Bartholomew, Benton, Blackford, Boone and 56 more	2 hr
Aug 7, 1:11 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Blackford, Boone, Carroll, Cass, Clinton and 31 more	6 hr
Aug 7, 5:49 PM EDT	Severe Thunderstorm Watch	SPC	Ashland, Athens, Belmont, Carroll, Coshocton, Guernsey and 16 more	4 hr
Aug 7, 7:36 PM EDT	Mesoscale Discussion	SPC	Gallia, Jackson, Meigs, Washington	84 min

Nearby

Mesoscale Discussions in Ohio, 2011 Mesoscale Discussions in Indiana, 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.