Alert archive / Iowa / Mesoscale Discussions in 2026

Mesoscale Discussion 1439

July 2, 2026Jo Daviess County, Illinois; 25 counties in Iowa; 5 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 2, 2026, 1:10 PM CDT for Jo Daviess County, Illinois; 25 counties in Iowa; 5 counties in Wisconsin. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued
Jul 2, 2026, 1:10 PM CDT (18:10 UTC)
Expired
Jul 2, 2026, 2:45 PM CDT
In force
95 min
Issued by
the Storm Prediction Center
Concerning
Severe thunderstorm watch 437
All 31 counties

Allamakee County, IA, Benton County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Grundy County, IA, Hardin County, IA, Howard County, IA, Jackson County, IA, Jones County, IA, Linn County, IA, Marshall County, IA, Mitchell County, IA, Tama County, IA, Winneshiek County, IA, Jo Daviess County, IL, Crawford County, WI, Grant County, WI, Iowa County, WI, Lafayette County, WI, Richland County, WI

The radar

The La Crosse radar (KARX), 128 km from the middle of the area, began a volume at 18:13 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

Minneapolis, MN (KMPX), launched 12:00Z, 6.2 hours before the alert went out and 279 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, Minneapolis, MN at 12:00Z on 2026-07-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 152 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, Minneapolis, MN at 12:00Z on 2026-07-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -28 square meters per square second.1939587897Sfc1 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
152 J/kg
Mixed-layer CIN
-173 J/kg
Mixed-layer LCL
1469 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
-28 m²/s²
0-3 km storm-relative helicity
38 m²/s²
Significant tornado parameter
0.0
Supercell composite
-1.0

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
Jul 2, 2:30 PM CDTMesoscale DiscussionSPCBoone, Jo Daviess, Lake, McHenry, Stephenson, Winnebago90 min
Jul 2, 5:42 PM CDTMesoscale DiscussionSPCCarroll, Jo Daviess, Rock Island, Stephenson, Whiteside2 hr
Jul 2, 6:32 PM CDTMesoscale DiscussionSPCAlexander, Hardin, Johnson, Massac, Pope, Pulaski118 min
Jul 1, 7:38 PM CDTSevere Thunderstorm WatchSPCBuena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 6 more6 hr
Jul 1, 10:28 PM CDTMesoscale DiscussionSPCAllamakee92 min
Jul 2, 11:05 AM CDTMesoscale DiscussionSPCAllamakee, Black Hawk, Bremer, Buchanan, Butler, Calhoun and 22 more85 min
Jul 2, 12:45 PM CDTSevere Thunderstorm WatchSPCAllamakee, Audubon, Benton, Black Hawk, Boone, Bremer and 33 more8 hr
Jul 2, 3:53 PM CDTMesoscale DiscussionSPCBenton, Black Hawk, Buchanan, Clayton, Delaware, Dubuque and 9 more97 min
Jul 2, 5:52 PM CDTMesoscale DiscussionSPCBuena Vista, Cherokee, Clay, Dickinson, Emmet, Ida and 8 more83 min
Jul 2, 6:08 PM CDTSevere Thunderstorm WatchSPCBuena Vista, Cherokee, Clay, Dickinson, Lyon, O'Brien and 3 more8 hr
Jul 1, 11:27 PM CDTSevere Thunderstorm WatchSPCCalumet, Columbia, Dodge, Fond du Lac, Green Lake, Manitowoc and 7 more3 hr
Jul 2, 3:19 PM CDTSevere Thunderstorm WatchSPCColumbia, Dane, Dodge, Fond du Lac, Green, Green Lake and 14 more7 hr
Jul 2, 5:10 PM CDTMesoscale DiscussionSPCColumbia, Dane, Dodge, Green, Jefferson, Kenosha and 8 more2 hr

Nearby

Mesoscale Discussions in Iowa, 2026Mesoscale Discussions in Wisconsin, 2026Mesoscale Discussions in Illinois, 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.