Alert archive / Ohio / Mesoscale Discussions in 2018

Mesoscale Discussion 488

May 21, 201811 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at May 21, 2018, 10:23 PM EDT for 11 counties in Ohio. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: May 21, 2018, 10:23 PM EDT (02:23 UTC)
Expired: May 22, 2018, 12:00 AM EDT
In force: 97 min
Issued by: the Storm Prediction Center

Counties Clinton County, OH, Coshocton County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Highland County, OH, Holmes County, OH, Knox County, OH, Licking County, OH, Pickaway County, OH, Ross County, OH

The radar

The Cincinnati radar (KILN), 90 km from the middle of the area, began a volume at 02:23 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 00:00Z, 2.4 hours before the alert went out and 88 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: 208 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 1822 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 70 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
May 21, 8:03 PM EDT	Mesoscale Discussion	SPC	Ashland, Butler, Champaign, Clark, Crawford, Delaware and 14 more	117 min
May 22, 12:57 PM EDT	Mesoscale Discussion	SPC	Allen, Ashland, Ashtabula, Auglaize, Brown, Butler and 63 more	3 hr
May 22, 1:42 PM EDT	Severe Thunderstorm Watch	SPC	Ashland, Ashtabula, Belmont, Brown, Butler, Carroll and 56 more	7 hr
May 22, 3:48 PM EDT	Mesoscale Discussion	SPC	Adams, Ashland, Athens, Auglaize, Belmont, Brown and 57 more	117 min
May 22, 6:36 PM EDT	Mesoscale Discussion	SPC	Belmont, Brown, Butler, Carroll, Champaign, Clark and 31 more	114 min

Nearby

Mesoscale Discussions in Ohio, 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.