Alert archive / Indiana / Mesoscale Discussions in 2026

Mesoscale Discussion 1925

August 11, 202635 counties in Indiana; Berrien County, Michigan

The Storm Prediction Center issued this mesoscale discussion at Aug 11, 2026, 12:42 PM EDT for 35 counties in Indiana; Berrien County, Michigan. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Aug 11, 2026, 12:42 PM EDT (16:42 UTC)
Expired
Aug 11, 2026, 2:45 PM EDT
In force
2 hr
Issued by
the Storm Prediction Center
Concerning
Severe thunderstorm watch 563...565
All 36 counties

Allen County, IN, Benton County, IN, Blackford County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, Delaware County, IN, Elkhart County, IN, Fulton County, IN, Grant County, IN, Hamilton County, IN, Howard County, IN, Huntington County, IN, Jasper County, IN, Kosciusko County, IN, LaGrange County, IN, Lake County, IN, LaPorte County, IN, Madison County, IN, Marshall County, IN, Miami County, IN, Newton County, IN, Noble County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Tippecanoe County, IN, Tipton County, IN, Wabash County, IN, Warren County, IN, Wells County, IN, White County, IN, Whitley County, IN, Berrien County, MI

The radar

The Northern Indiana radar (KIWX), 74 km from the middle of the area, began a volume at 16:40 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

Lincoln, IL (KILX), launched 12:00Z, 4.7 hours before the alert went out and 210 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, Lincoln, IL at 12:00Z on 2026-08-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2617 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, Lincoln, IL at 12:00Z on 2026-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 142 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
2617 J/kg
Mixed-layer CIN
-144 J/kg
Mixed-layer LCL
1547 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
142 m²/s²
0-3 km storm-relative helicity
140 m²/s²
Significant tornado parameter
0.2
Supercell composite
4.5

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, 8:00 AM EDTMesoscale DiscussionSPCDelaware, Henry, Randolph, Union, Wayne2 hr
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, 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

Nearby

Mesoscale Discussions in Indiana, 2026Mesoscale Discussions in Michigan, 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.