Alert archive / Illinois / Mesoscale Discussions in 2023

Mesoscale Discussion 1713

July 25, 202311 counties in Illinois; Vermillion County, Indiana

The Storm Prediction Center issued this mesoscale discussion at Jul 25, 2023, 9:48 PM CDT for 11 counties in Illinois; Vermillion County, Indiana. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Jul 25, 2023, 9:48 PM CDT (02:48 UTC)
Expired: Jul 25, 2023, 11:15 PM CDT
In force: 87 min
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch unlikely
Chance of a watch: 5%

Counties Champaign County, IL, Clark County, IL, Coles County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Macon County, IL, Moultrie County, IL, Piatt County, IL, Shelby County, IL, Vermilion County, IL, Vermillion County, IN

The radar

The Lincoln radar (KILX), 103 km from the middle of the area, began a volume at 02:48 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

Lincoln, IL (KILX), launched 00:00Z, 2.8 hours before the alert went out and 58 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: 2899 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 1180 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 173 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 10.4

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
Jul 26, 7:30 AM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, DeKalb, Henry, Jo Daviess and 10 more	90 min
Jul 26, 8:45 AM CDT	Mesoscale Discussion	SPC	Lake	2 hr
Jul 26, 11:59 AM CDT	Mesoscale Discussion	SPC	Bond, Brown, Calhoun, Cass, Christian, Clinton and 19 more	2 hr
Jul 26, 3:57 PM CDT	Mesoscale Discussion	SPC	Cook, DuPage, Lake	63 min
Jul 26, 9:03 AM CDT	Severe Thunderstorm Watch	SPC	Elkhart, LaGrange, LaPorte, Saint Joseph, Steuben	6 hr
Jul 26, 12:45 PM CDT	Mesoscale Discussion	SPC	Adams, Allen, Blackford, DeKalb, Jay, Wells	90 min
Jul 26, 5:33 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Allen, DeKalb, Elkhart, Huntington, Kosciusko and 6 more	5 hr

Nearby

Mesoscale Discussions in Illinois, 2023 Mesoscale Discussions in Indiana, 2023 Every mesoscale discussion in 2023

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.