Alert archive / Ohio / Mesoscale Discussions in 2026

Mesoscale Discussion 1920

August 11, 20265 counties in Indiana; 18 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Aug 11, 2026, 8:00 AM EDT for 5 counties in Indiana; 18 counties in Ohio. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Aug 11, 2026, 8:00 AM EDT (12:00 UTC)
Expired
Aug 11, 2026, 10:00 AM EDT
In force
2 hr
Issued by
the Storm Prediction Center
Concerning
Severe potential...watch possible
Chance of a watch
40%
All 23 counties

Delaware County, IN, Henry County, IN, Randolph County, IN, Union County, IN, Wayne County, IN, Brown County, OH, Butler County, OH, Champaign County, OH, Clark County, OH, Clermont County, OH, Clinton County, OH, Darke County, OH, Fayette County, OH, Greene County, OH, Highland County, OH, Madison County, OH, Miami County, OH, Montgomery County, OH, Pickaway County, OH, Pike County, OH, Preble County, OH, Ross County, OH, Warren County, OH

The radar

The Cincinnati radar (KILN), 61 km from the middle of the area, began a volume at 12:01 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.

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 0.0 hours before the alert went out and 61 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-pSkew-T log-p diagram, Cncnati-Daytn, OH at 12:00Z on 2026-08-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3952 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Cncnati-Daytn, OH at 12:00Z on 2026-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 144 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
3952 J/kg
Mixed-layer CIN
-27 J/kg
Mixed-layer LCL
708 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
144 m²/s²
0-3 km storm-relative helicity
188 m²/s²
Significant tornado parameter
2.4
Supercell composite
13.3

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.

IssuedProductOfficeCountiesLasted
Aug 10, 9:00 PM EDTMesoscale DiscussionSPCAdams, Allen, Blackford, Cass, DeKalb, Elkhart and 16 more90 min
Aug 11, 8:22 AM EDTSevere Thunderstorm WatchSPCBenton, Jasper, Lake, Newton, Porter6 hr
Aug 11, 8:41 AM EDTSevere Thunderstorm WatchSPCDearborn, Fayette, Franklin, Henry, Ohio, Rush and 3 more7 hr
Aug 11, 10:00 AM EDTMesoscale DiscussionSPCLake, Newton2 hr
Aug 11, 10:31 AM EDTMesoscale DiscussionSPCAdams, Allen, Blackford, Boone, Carroll, Cass and 29 more119 min
Aug 11, 11:01 AM EDTSevere Thunderstorm WatchSPCAdams, Allen, Bartholomew, Blackford, Boone, Brown and 57 more10 hr
Aug 11, 11:18 AM EDTMesoscale DiscussionSPCDearborn, Ohio117 min
Aug 11, 12:12 PM EDTMesoscale DiscussionSPCFranklin, Union, Wayne63 min
Aug 11, 12:40 PM EDTSevere Thunderstorm WatchSPCFayette, Franklin, Union, Wayne7 hr
Aug 11, 12:42 PM EDTMesoscale DiscussionSPCAllen, Benton, Blackford, Boone, Carroll, Cass and 29 more2 hr
Aug 11, 1:57 PM EDTMesoscale DiscussionSPCBoone, Clinton, Dearborn, Decatur, Delaware, Fayette and 15 more2 hr
Aug 11, 2:36 PM EDTSevere Thunderstorm WatchSPCClark, Crawford, Dearborn, Dubois, Floyd, Harrison and 8 more7 hr
Aug 11, 3:28 PM EDTMesoscale DiscussionSPCBartholomew, Benton, Boone, Brown, Clay, Fountain and 16 more2 hr
Aug 11, 3:52 PM EDTMesoscale DiscussionSPCDearborn, Ohio, Ripley, Switzerland113 min
Aug 11, 6:24 PM EDTMesoscale DiscussionSPCBartholomew, Brown, Clark, Clay, Crawford, Daviess and 27 more2 hr
Aug 10, 10:52 PM EDTMesoscale DiscussionSPCAllen, Auglaize, Champaign, Clark, Coshocton, Crawford and 20 more83 min
Aug 11, 11:37 AM EDTSevere Thunderstorm WatchSPCMorgan, Washington4 hr

Nearby

Mesoscale Discussions in Ohio, 2026Mesoscale Discussions in Indiana, 2026Every 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.