Alert archive / Ohio / Mesoscale Discussions in 2018

Mesoscale Discussion 494

May 22, 20185 states

The Storm Prediction Center issued this mesoscale discussion at May 22, 2018, 6:36 PM EDT for 5 states. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: May 22, 2018, 6:36 PM EDT (22:36 UTC)
Expired: May 22, 2018, 8:30 PM EDT
In force: 114 min
Issued by: the Storm Prediction Center

All 55 counties

Dearborn County, IN, Ohio County, IN, Boone County, KY, Campbell County, KY, Kenton County, KY, Belmont 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, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Greene County, OH, Guernsey County, OH, Hamilton County, OH, Harrison County, OH, Highland County, OH, Hocking County, OH, Holmes County, OH, Jefferson County, OH, Knox County, OH, Licking County, OH, Madison County, OH, Monroe County, OH, Montgomery County, OH, Morgan County, OH, Morrow County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Pickaway County, OH, Ross County, OH, Tuscarawas County, OH, Union County, OH, Warren County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Butler County, PA, Clarion County, PA, Greene County, PA, Lawrence County, PA, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Hancock County, WV, Marshall County, WV, Ohio County, WV

The radar

The Cleveland radar (KCLE), 160 km from the middle of the area, began a volume at 22:37 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, 10.6 hours before the alert went out and 165 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: 74 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 715 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 201 m²/s²
0-3 km storm-relative helicity: 217 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, 12:57 PM EDT	Mesoscale Discussion	SPC	Dearborn, Decatur, Delaware, Fayette, Franklin, Hancock and 8 more	3 hr
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 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 Pennsylvania, 2018 Mesoscale Discussions in West Virginia, 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.