Alert archive / Illinois / Mesoscale Discussions in 2024

Mesoscale Discussion 932

May 24, 202418 counties in Illinois; 12 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at May 24, 2024, 1:39 PM CDT for 18 counties in Illinois; 12 counties in Indiana. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 24, 2024, 1:39 PM CDT (18:39 UTC)
Expired: May 24, 2024, 3:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch possible
Chance of a watch: 40%

All 30 counties

Bond County, IL, Christian County, IL, Clark County, IL, Coles County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Fayette County, IL, Greene County, IL, Jasper County, IL, Macoupin County, IL, Madison County, IL, Montgomery County, IL, Moultrie County, IL, Sangamon County, IL, Shelby County, IL, Vermilion County, IL, Benton County, IN, Carroll County, IN, Fountain County, IN, Jasper County, IN, Montgomery County, IN, Parke County, IN, Pulaski County, IN, Tippecanoe County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN, White County, IN

The radar

The Lincoln radar (KILX), 87 km from the middle of the area, began a volume at 18:41 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 302May 24, 2:40 PM CDT

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 6.7 hours before the alert went out and 37 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: 1248 J/kg
Mixed-layer CIN: -105 J/kg
Mixed-layer LCL: 876 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 24, 6:07 AM CDT	Severe Thunderstorm Watch	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 33 more	9 hr
May 24, 8:44 AM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, DeKalb, Jo Daviess, Kane and 9 more	2 hr
May 24, 11:57 AM CDT	Mesoscale Discussion	SPC	Adams, Brown, Calhoun, Cass, Greene, Hancock and 5 more	2 hr
May 24, 2:39 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Bond, Brown, Calhoun, Cass, Christian and 31 more	10 hr
May 24, 3:57 PM CDT	Mesoscale Discussion	SPC	Bond, Brown, Calhoun, Cass, Christian, Clay and 34 more	93 min
May 24, 4:46 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 15 more	119 min
May 24, 6:19 PM CDT	Mesoscale Discussion	SPC	Bond, Calhoun, Christian, Clinton, Effingham, Fayette and 10 more	116 min
May 24, 3:19 PM CDT	Mesoscale Discussion	SPC	Boone, Carroll, Cass, Clinton, Elkhart, Fulton and 16 more	116 min

Nearby

Mesoscale Discussions in Illinois, 2024 Mesoscale Discussions in Indiana, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.