Alert archive / Ohio / Mesoscale Discussions in 2026

Mesoscale Discussion 1990

August 15, 2026Adams County, Indiana; 19 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Aug 15, 2026, 4:56 PM EDT for Adams County, Indiana; 19 counties in Ohio. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 15, 2026, 4:56 PM EDT (20:56 UTC)
Expired: Aug 15, 2026, 7:00 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch possible
Chance of a watch: 40%

Counties Adams County, IN, Allen County, OH, Auglaize County, OH, Champaign County, OH, Clark County, OH, Darke County, OH, Delaware County, OH, Greene County, OH, Hardin County, OH, Logan County, OH, Madison County, OH, Marion County, OH, Mercer County, OH, Miami County, OH, Montgomery County, OH, Paulding County, OH, Putnam County, OH, Shelby County, OH, Union County, OH, Van Wert County, OH

The radar

The Cincinnati radar (KILN), 111 km from the middle of the area, began a volume at 20:57 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 nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 8.9 hours before the alert went out and 111 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: 313 J/kg
Mixed-layer CIN: -154 J/kg
Mixed-layer LCL: 728 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 91 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
Aug 15, 2:08 PM EDT	Mesoscale Discussion	SPC	Ohio, Switzerland	2 hr

Nearby

Mesoscale Discussions in Ohio, 2026 Mesoscale Discussions in Indiana, 2026 Every mesoscale discussion in 2026

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.