Alert archive / Indiana / Mesoscale Discussions in 2026

Mesoscale Discussion 337

April 2, 20267 counties in Illinois; 45 counties in Indiana; 4 counties in Michigan

The Storm Prediction Center issued this mesoscale discussion at Apr 2, 2026, 5:11 PM CDT for 7 counties in Illinois; 45 counties in Indiana; 4 counties in Michigan. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued
Apr 2, 2026, 5:11 PM CDT (22:11 UTC)
Expired
Apr 2, 2026, 6:45 PM CDT
In force
94 min
Issued by
the Storm Prediction Center
Concerning
Severe potential...watch possible
Chance of a watch
60%
All 56 counties

Clark County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Vermilion County, IL, Allen County, IN, Benton County, IN, Blackford County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clay County, IN, Clinton County, IN, DeKalb County, IN, Elkhart County, IN, Fountain County, IN, Fulton County, IN, Grant County, IN, Hamilton County, IN, Hendricks County, IN, Howard County, IN, Huntington County, IN, Jasper County, IN, Kosciusko County, IN, LaGrange County, IN, LaPorte County, IN, Madison County, IN, Marion County, IN, Marshall County, IN, Miami County, IN, Montgomery County, IN, Newton County, IN, Noble County, IN, Owen County, IN, Parke County, IN, Pulaski County, IN, Putnam County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Sullivan County, IN, Tippecanoe County, IN, Tipton County, IN, Vermillion County, IN, Vigo County, IN, Wabash County, IN, Warren County, IN, Wells County, IN, White County, IN, Whitley County, IN, Branch County, MI, Cass County, MI, Kalamazoo County, MI, Saint Joseph County, MI

The radar

The Indianapolis radar (KIND), 110 km from the middle of the area, began a volume at 22:14 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

Lincoln, IL (KILX), launched 12:00Z, 10.2 hours before the alert went out and 167 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 2026-04-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 19 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 2026-04-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 453 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
19 J/kg
Mixed-layer CIN
-278 J/kg
Mixed-layer LCL
846 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
453 m²/s²
0-3 km storm-relative helicity
450 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.

IssuedProductOfficeCountiesLasted
Apr 2, 12:28 PM CDTMesoscale DiscussionSPCBureau, Carroll, DeKalb, Hancock, Henderson, Henry and 12 more3 hr
Apr 2, 1:43 PM CDTTornado WatchSPCAdams, Boone, Brown, Bureau, Carroll, Cass and 37 more8 hr
Apr 2, 3:41 PM CDTMesoscale DiscussionSPCAdams, Brown, Fulton, Hancock, Henderson, Henry and 6 more94 min
Apr 2, 3:48 PM CDTMesoscale DiscussionSPCAlexander, Franklin, Jackson, Jefferson, Johnson, Perry and 6 more117 min
Apr 2, 4:26 PM CDTMesoscale DiscussionSPCCarroll, Henry, Jo Daviess, Mercer, Rock Island, Stephenson and 1 more94 min
Apr 2, 5:39 PM CDTMesoscale DiscussionSPCBond, Calhoun, Cass, Champaign, Christian, Clinton and 22 more2 hr
Apr 2, 5:28 PM CDTTornado WatchSPCElkhart, LaPorte, Saint Joseph3 hr
Apr 2, 6:45 PM CDTSevere Thunderstorm WatchSPCAllen, Blackford, Boone, Carroll, Cass, Clay and 27 more118 min
Apr 2, 12:34 PM CDTMesoscale DiscussionSPCAlger, Alpena, Charlevoix, Cheboygan, Chippewa, Delta and 8 more4 hr

Nearby

Mesoscale Discussions in Indiana, 2026Mesoscale Discussions in Illinois, 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.