Alert archive / Illinois / Mesoscale Discussions in 2024

Mesoscale Discussion 488

April 18, 20244 states

The Storm Prediction Center issued this mesoscale discussion at Apr 18, 2024, 6:12 PM CDT for 4 states. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Apr 18, 2024, 6:12 PM CDT (23:12 UTC)
Expired: Apr 18, 2024, 7:45 PM CDT
In force: 93 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 125

All 76 counties

Bond County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Johnson County, IL, Lawrence County, IL, Macon County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Moultrie County, IL, Perry County, IL, Piatt County, IL, Pope County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Saline County, IL, Shelby County, IL, Union County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Clay County, IN, Daviess County, IN, Gibson County, IN, Greene County, IN, Knox County, IN, Parke County, IN, Pike County, IN, Posey County, IN, Spencer County, IN, Sullivan County, IN, Vanderburgh County, IN, Vermillion County, IN, Vigo County, IN, Warrick County, IN, Daviess County, KY, Henderson County, KY, McLean County, KY, Union County, KY, Webster County, KY, Bollinger County, MO, Cape Girardeau County, MO, City of Saint Louis, MO, Crawford County, MO, Dent County, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Perry County, MO, Reynolds County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 104 km from the middle of the area, began a volume at 23:15 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.

Severe Thunderstorm Watch 129Apr 18, 6:35 PM CDT

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
Apr 18, 12:08 PM CDT	Mesoscale Discussion	SPC	Bond, Calhoun, Christian, Clay, Clinton, Effingham and 17 more	2 hr
Apr 18, 12:56 PM CDT	Severe Thunderstorm Watch	SPC	Alexander, Bond, Calhoun, Christian, Clay, Clinton and 35 more	8 hr
Apr 18, 3:09 PM CDT	Mesoscale Discussion	SPC	Alexander, Bond, Calhoun, Christian, Clay, Clinton and 28 more	2 hr
Apr 18, 4:48 PM CDT	Mesoscale Discussion	SPC	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 14 more	87 min
Apr 18, 6:36 PM CDT	Severe Thunderstorm Watch	SPC	Alexander, Clark, Coles, Crawford, Cumberland, Edgar and 21 more	6 hr
Apr 17, 8:31 PM CDT	Mesoscale Discussion	SPC	Andrew, Buchanan, Cass, Clay, Clinton, DeKalb and 4 more	2 hr
Apr 17, 11:41 PM CDT	Severe Thunderstorm Watch	SPC	Andrew, Buchanan, Caldwell, Cass, Clay, Clinton and 7 more	6 hr
Apr 18, 2:00 AM CDT	Mesoscale Discussion	SPC	Cass, Clay, Jackson, Platte	90 min
Apr 18, 3:25 AM CDT	Mesoscale Discussion	SPC	Buchanan, Caldwell, Carroll, Cass, Clay, Clinton and 8 more	95 min

Nearby

Mesoscale Discussions in Illinois, 2024 Mesoscale Discussions in Indiana, 2024 Mesoscale Discussions in Missouri, 2024 Every mesoscale discussion in 2024

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.