Alert archive / Ohio / Mesoscale Discussions in 2011

Mesoscale Discussion 2031

August 21, 2011Campbell County, Kentucky; 44 counties in Ohio; 10 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Aug 21, 2011, 1:43 PM EDT for Campbell County, Kentucky; 44 counties in Ohio; 10 counties in West Virginia. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: Aug 21, 2011, 1:43 PM EDT (17:43 UTC)
Expired: Aug 21, 2011, 2:45 PM EDT
In force: 62 min
Issued by: the Storm Prediction Center

All 55 counties

Campbell County, KY, Adams County, OH, Athens County, OH, Belmont County, OH, Brown County, OH, Butler County, OH, Champaign County, OH, Clark County, OH, Clermont County, OH, Clinton County, OH, Coshocton County, OH, Darke County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Gallia County, OH, Greene County, OH, Guernsey County, OH, Hamilton County, OH, Highland County, OH, Hocking County, OH, Jackson County, OH, Knox 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, Scioto County, OH, Shelby County, OH, Union County, OH, Vinton County, OH, Warren County, OH, Washington County, OH, Calhoun County, WV, Doddridge County, WV, Gilmer County, WV, Jackson County, WV, Mason County, WV, Pleasants County, WV, Ritchie County, WV, Tyler County, WV, Wirt County, WV, Wood County, WV

The radar

The Cincinnati radar (KILN), 116 km from the middle of the area, began a volume at 17:43 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

Cncnati-Daytn, OH (KILN), launched 12:00Z, 5.7 hours before the alert went out and 114 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: 1624 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 844 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.2

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 21, 11:54 AM EDT	Mesoscale Discussion	SPC	Berkeley, Hampshire, Jefferson, Morgan	2 hr
Aug 21, 12:52 PM EDT	Severe Thunderstorm Watch	SPC	Berkeley, Jefferson	8 hr
Aug 21, 7:12 PM EDT	Mesoscale Discussion	SPC	Berkeley, Jefferson	63 min

Nearby

Mesoscale Discussions in Ohio, 2011 Mesoscale Discussions in West Virginia, 2011 Mesoscale Discussions in Kentucky, 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.