Alert archive / Ohio / Mesoscale Discussions in 2012

Mesoscale Discussion 1495

July 18, 20125 states

The Storm Prediction Center issued this mesoscale discussion at Jul 18, 2012, 4:21 PM EDT for 5 states. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Jul 18, 2012, 4:21 PM EDT (20:21 UTC)
Expired: Jul 18, 2012, 5:45 PM EDT
In force: 84 min
Issued by: the Storm Prediction Center

All 112 counties

Bartholomew County, IN, Blackford County, IN, Boone County, IN, Brown County, IN, Cass County, IN, Clinton County, IN, Dearborn County, IN, Decatur County, IN, Delaware County, IN, Fayette County, IN, Franklin County, IN, Grant County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Howard County, IN, Jackson County, IN, Jay County, IN, Jefferson County, IN, Jennings County, IN, Johnson County, IN, Madison County, IN, Marion County, IN, Monroe County, IN, Morgan County, IN, Ohio County, IN, Putnam County, IN, Randolph County, IN, Ripley County, IN, Rush County, IN, Shelby County, IN, Switzerland County, IN, Tipton County, IN, Union County, IN, Wayne County, IN, Boone County, KY, Bracken County, KY, Campbell County, KY, Gallatin County, KY, Grant County, KY, Kenton County, KY, Mason County, KY, Pendleton County, KY, Adams County, OH, Athens County, OH, Belmont County, OH, Brown County, OH, Butler County, OH, Carroll County, OH, Champaign County, OH, Clark County, OH, Clermont County, OH, Clinton County, OH, Coshocton County, OH, Darke County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Gallia County, OH, Greene County, OH, Guernsey County, OH, Hamilton County, OH, Harrison County, OH, Highland County, OH, Hocking County, OH, Jackson County, OH, Jefferson County, OH, Licking 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, Tuscarawas County, OH, Vinton County, OH, Warren County, OH, Washington County, OH, Greene County, PA, Washington County, PA, Braxton County, WV, Brooke County, WV, Calhoun County, WV, Doddridge County, WV, Gilmer County, WV, Hancock County, WV, Harrison County, WV, Jackson County, WV, Lewis County, WV, Marion County, WV, Marshall County, WV, Mason County, WV, Monongalia County, WV, Ohio County, WV, Pleasants County, WV, Ritchie County, WV, Roane County, WV, Taylor County, WV, Tyler County, WV, Wetzel County, WV, Wirt County, WV, Wood County, WV

The radar

The Cincinnati radar (KILN), 33 km from the middle of the area, began a volume at 20:23 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, 8.4 hours before the alert went out and 31 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: 2497 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 1093 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -23 m²/s²
0-3 km storm-relative helicity: -5 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
Jul 18, 12:54 PM EDT	Mesoscale Discussion	SPC	Adams, Allen, Blackford, Decatur, Delaware, Fayette and 15 more	2 hr
Jul 18, 1:16 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Allen, Bartholomew, Blackford, Carroll, Cass and 28 more	8 hr
Jul 18, 1:58 PM EDT	Severe Thunderstorm Watch	SPC	Benton, Jasper, Lake, Newton, Porter	7 hr
Jul 18, 7:56 PM EDT	Mesoscale Discussion	SPC	Lake, LaPorte, Porter, Starke	94 min
Jul 18, 10:25 AM EDT	Mesoscale Discussion	SPC	Berks, Blair, Bradford, Bucks, Cambria, Cameron and 39 more	2 hr
Jul 18, 12:41 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Bedford, Berks, Blair, Bucks, Cambria and 36 more	8 hr
Jul 18, 3:44 PM EDT	Mesoscale Discussion	SPC	Adams, Berks, Bucks, Chester, Delaware, Lancaster and 5 more	91 min

Nearby

Mesoscale Discussions in Ohio, 2012 Mesoscale Discussions in Indiana, 2012 Mesoscale Discussions in West Virginia, 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.