Alert archive / Illinois / Mesoscale Discussions in 2022

Mesoscale Discussion 920

May 25, 202230 counties in Illinois; 10 counties in Iowa

The Storm Prediction Center issued this mesoscale discussion at May 25, 2022, 6:46 PM CDT for 30 counties in Illinois; 10 counties in Iowa. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: May 25, 2022, 6:46 PM CDT (23:46 UTC)
Expired: May 25, 2022, 8:45 PM CDT
In force: 119 min
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch unlikely
Chance of a watch: 20%

All 40 counties

Cedar County, IA, Clinton County, IA, Des Moines County, IA, Jackson County, IA, Johnson County, IA, Jones County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Brown County, IL, Bureau County, IL, Cass County, IL, Christian County, IL, DeWitt County, IL, Fulton County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Knox County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Mercer County, IL, Morgan County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Woodford County, IL

The radar

The Quad Cities radar (KDVN), 64 km from the middle of the area, began a volume at 23:47 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

Davenport, (KDVN), launched 12:00Z, 11.8 hours before the alert went out and 65 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 667 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 264 m²/s²
0-3 km storm-relative helicity: 285 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.

Issued	Product	Office	Counties	Lasted
May 25, 3:37 PM CDT	Mesoscale Discussion	SPC	Cook, DeKalb, DuPage, Grundy, Iroquois, Kane and 7 more	113 min

Nearby

Mesoscale Discussions in Illinois, 2022 Mesoscale Discussions in Iowa, 2022 Every mesoscale discussion in 2022

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.