Alert archive / Ohio / Mesoscale Discussions in 2018

Mesoscale Discussion 23

January 12, 20184 states

The Storm Prediction Center issued this mesoscale discussion at Jan 12, 2018, 2:58 PM EST for 4 states. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Jan 12, 2018, 2:58 PM EST (19:58 UTC)
Expired: Jan 12, 2018, 7:00 PM EST
In force: 4 hr
Issued by: the Storm Prediction Center

All 57 counties

Boone County, KY, Campbell County, KY, Kenton County, KY, Chautauqua County, NY, Erie County, NY, Genesee County, NY, Niagara County, NY, Wyoming County, NY, Ashland County, OH, Ashtabula County, OH, Butler County, OH, Champaign County, OH, Clark County, OH, Clermont County, OH, Clinton County, OH, Coshocton County, OH, Crawford County, OH, Cuyahoga County, OH, Delaware County, OH, Erie County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Geauga County, OH, Greene County, OH, Hamilton County, OH, Hardin County, OH, Highland County, OH, Holmes County, OH, Huron County, OH, Knox County, OH, Lake County, OH, Licking County, OH, Logan County, OH, Lorain County, OH, Madison County, OH, Mahoning County, OH, Marion County, OH, Medina County, OH, Miami County, OH, Montgomery County, OH, Morrow County, OH, Pickaway County, OH, Portage County, OH, Preble County, OH, Richland County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Tuscarawas County, OH, Union County, OH, Warren County, OH, Wayne County, OH, Wyandot County, OH, Crawford County, PA, Erie County, PA, Mercer County, PA

The radar

The Cleveland radar (KCLE), 70 km from the middle of the area, began a volume at 20:00 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

Pittsburgh, PA (KAGC), launched 12:00Z, 8.0 hours before the alert went out and 189 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 855 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 134 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Jan 11, 9:43 PM EST	Mesoscale Discussion	SPC	Ballard	6 hr
Jan 12, 3:00 AM EST	Mesoscale Discussion	SPC	Ballard, Breckinridge, Bullitt, Butler, Caldwell, Calloway and 30 more	5 hr
Jan 12, 3:04 AM EST	Mesoscale Discussion	SPC	Carroll, Trimble	6 hr
Jan 12, 8:51 AM EST	Mesoscale Discussion	SPC	Adair, Allen, Anderson, Barren, Boone, Bourbon and 41 more	5 hr

Nearby

Mesoscale Discussions in Ohio, 2018 Mesoscale Discussions in New York, 2018 Mesoscale Discussions in Kentucky, 2018 Every mesoscale discussion in 2018

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.