Alert archive / Illinois / Mesoscale Discussions in 2025

Mesoscale Discussion 182

March 14, 20254 states

The Storm Prediction Center issued this mesoscale discussion at Mar 14, 2025, 9:21 PM CDT for 4 states. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Mar 14, 2025, 9:21 PM CDT (02:21 UTC)
Expired
Mar 14, 2025, 10:45 PM CDT
In force
84 min
Issued by
the Storm Prediction Center
Concerning
Severe thunderstorm watch 34...35
All 60 counties

Allamakee County, IA, Clayton County, IA, Clinton County, IA, Dubuque County, IA, Jackson County, IA, Jones County, IA, Scott County, IA, Winneshiek County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Henry County, IL, Jo Daviess County, IL, Kane County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Marshall County, IL, McHenry County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Fillmore County, MN, Houston County, MN, Olmsted County, MN, Winona County, MN, Adams County, WI, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Grant County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Jefferson County, WI, Juneau County, WI, La Crosse County, WI, Lafayette County, WI, Marquette County, WI, Monroe County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Vernon County, WI, Walworth County, WI, Waukesha County, WI

The radar

The Quad Cities radar (KDVN), 128 km from the middle of the area, began a volume at 02:24 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

Davenport, (KDVN), launched 00:00Z, 2.4 hours before the alert went out and 126 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, Davenport, at 00:00Z on 2025-03-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 311 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, Davenport, at 00:00Z on 2025-03-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 293 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
311 J/kg
Mixed-layer CIN
-249 J/kg
Mixed-layer LCL
2519 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
293 m²/s²
0-3 km storm-relative helicity
345 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

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
Mar 14, 7:34 PM CDTTornado Watch PDSSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more10 hr
Mar 14, 7:45 PM CDTMesoscale DiscussionSPCBond, Brown, Calhoun, Cass, Champaign, Christian and 46 more2 hr
Mar 14, 8:02 PM CDTTornado WatchSPCBond, Cass, Champaign, Christian, Clark, Clay and 38 more7 hr
Mar 14, 8:06 PM CDTMesoscale DiscussionSPCCarroll, Hancock, Henderson, Henry, Jo Daviess, Knox and 5 more114 min
Mar 14, 8:47 PM CDTMesoscale DiscussionSPCJersey, Macoupin, Madison, Monroe, Saint Clair88 min
Mar 14, 10:20 PM CDTMesoscale DiscussionSPCAlexander115 min
Mar 14, 10:42 PM CDTMesoscale DiscussionSPCBond, Champaign, Christian, Clark, Clay, Clinton and 30 more63 min
Mar 14, 11:14 PM CDTMesoscale DiscussionSPCBoone, DeKalb, DuPage, Grundy, Jo Daviess, Kane and 10 more2 hr
Mar 14, 11:50 PM CDTMesoscale DiscussionSPCAlexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 10 more115 min
Mar 15, 7:47 AM CDTMesoscale DiscussionSPCBecker, Beltrami, Cass, Chippewa, Clearwater, Cottonwood and 19 more4 hr
Mar 14, 10:02 PM CDTSevere Thunderstorm WatchSPCColumbia, Dane, Dodge, Fond du Lac, Green, Green Lake and 14 more4 hr

Nearby

Mesoscale Discussions in Illinois, 2025Mesoscale Discussions in Wisconsin, 2025Mesoscale Discussions in Iowa, 2025Every mesoscale discussion in 2025

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.