Alert archive / Ohio / Mesoscale Discussions in 2018

Mesoscale Discussion 489

May 22, 20184 states

The Storm Prediction Center issued this mesoscale discussion at May 22, 2018, 12:57 PM EDT for 4 states. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: May 22, 2018, 12:57 PM EDT (16:57 UTC)
Expired: May 22, 2018, 3:30 PM EDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 89 counties

Dearborn County, IN, Decatur County, IN, Delaware County, IN, Fayette County, IN, Franklin County, IN, Hancock County, IN, Henry County, IN, Jay County, IN, Ohio County, IN, Randolph County, IN, Ripley County, IN, Rush County, IN, Union County, IN, Wayne County, IN, Boone County, KY, Campbell County, KY, Kenton County, KY, Allen County, OH, Ashland County, OH, Ashtabula County, OH, Auglaize County, OH, Brown County, OH, Butler County, OH, Carroll County, OH, Champaign County, OH, Clark County, OH, Clermont County, OH, Clinton County, OH, Columbiana County, OH, Coshocton County, OH, Crawford County, OH, Cuyahoga County, OH, Darke County, OH, Delaware County, OH, Erie County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Geauga County, OH, Greene County, OH, Guernsey County, OH, Hamilton County, OH, Hancock County, OH, Hardin County, OH, Harrison County, OH, Highland County, OH, Hocking 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, Mercer County, OH, Miami County, OH, Montgomery County, OH, Morgan County, OH, Morrow County, OH, Muskingum County, OH, Ottawa County, OH, Perry County, OH, Pickaway County, OH, Pike County, OH, Portage County, OH, Preble County, OH, Putnam County, OH, Richland County, OH, Ross County, OH, Sandusky County, OH, Seneca County, OH, Shelby County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Tuscarawas County, OH, Union County, OH, Vinton County, OH, Warren County, OH, Wayne County, OH, Wood County, OH, Wyandot County, OH, Crawford County, PA, Lawrence County, PA, Mercer County, PA

The radar

The Cleveland radar (KCLE), 117 km from the middle of the area, began a volume at 16:57 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 115May 22, 1:40 PM EDT

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 5.0 hours before the alert went out and 159 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: 45 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 768 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 29 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
May 21, 8:03 PM EDT	Mesoscale Discussion	SPC	Franklin, Union	117 min
May 22, 1:42 PM EDT	Severe Thunderstorm Watch	SPC	Dearborn, Fayette, Franklin, Ohio, Ripley, Union and 1 more	7 hr
May 22, 3:48 PM EDT	Mesoscale Discussion	SPC	Dearborn, Fayette, Franklin, Ohio, Switzerland, Union and 1 more	117 min
May 22, 6:36 PM EDT	Mesoscale Discussion	SPC	Dearborn, Ohio	114 min
May 21, 10:23 PM EDT	Mesoscale Discussion	SPC	Clinton, Coshocton, Fairfield, Fayette, Franklin, Highland and 5 more	97 min

Nearby

Mesoscale Discussions in Ohio, 2018 Mesoscale Discussions in Indiana, 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.