Alert archive / Illinois / Mesoscale Discussions in 2023

Mesoscale Discussion 702

May 7, 202313 counties in Illinois; Vigo County, Indiana

The Storm Prediction Center issued this mesoscale discussion at May 7, 2023, 4:05 AM CDT for 13 counties in Illinois; Vigo County, Indiana. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: May 7, 2023, 4:05 AM CDT (09:05 UTC)
Expired: May 7, 2023, 5:30 AM CDT
In force: 85 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 194

Counties Christian County, IL, Clark County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Jasper County, IL, Macon County, IL, Menard County, IL, Moultrie County, IL, Sangamon County, IL, Shelby County, IL, Vigo County, IN

The radar

The Lincoln radar (KILX), 78 km from the middle of the area, began a volume at 09:06 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, 9.1 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: 536 J/kg
Mixed-layer CIN: -269 J/kg
Mixed-layer LCL: 836 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 251 m²/s²
0-3 km storm-relative helicity: 363 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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
May 6, 8:12 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Cass, Christian, Fulton, Greene and 22 more	93 min
May 6, 8:50 PM CDT	Severe Thunderstorm Watch	SPC	Fulton, Hancock, Henderson, Knox, McDonough, Mercer and 2 more	7 hr
May 6, 9:00 PM CDT	Tornado Watch	SPC	Adams, Brown, Pike	5 hr
May 6, 10:44 PM CDT	Severe Thunderstorm Watch	SPC	Cass, Champaign, Christian, Coles, Cumberland, DeWitt and 15 more	6 hr
May 6, 11:34 PM CDT	Mesoscale Discussion	SPC	Brown, Cass, Fulton, Hancock, Henderson, Knox and 11 more	86 min
May 7, 1:37 AM CDT	Mesoscale Discussion	SPC	Fulton, Hancock, Henderson, Knox, McDonough, Mason and 3 more	113 min
May 7, 2:21 AM CDT	Mesoscale Discussion	SPC	Clark, Coles, Cumberland, Moultrie	114 min
May 7, 1:00 PM CDT	Mesoscale Discussion	SPC	Alexander, Bond, Christian, Clay, Clinton, Effingham and 30 more	2 hr
May 7, 1:18 PM CDT	Severe Thunderstorm Watch	SPC	Alexander, Bond, Calhoun, Cass, Christian, Clay and 47 more	10 hr
May 7, 3:40 PM CDT	Mesoscale Discussion	SPC	Bond, Cass, Christian, Clay, Clinton, Edwards and 35 more	65 min
May 7, 4:10 PM CDT	Severe Thunderstorm Watch	SPC	Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 10 more	10 hr
May 7, 5:35 PM CDT	Mesoscale Discussion	SPC	Bureau, Carroll, Cass, Fulton, Hancock, Henderson and 11 more	85 min
May 7, 6:10 PM CDT	Mesoscale Discussion	SPC	Bond, Cass, Christian, Greene, Jersey, Macoupin and 8 more	2 hr
May 7, 6:40 PM CDT	Mesoscale Discussion	SPC	Ford, Grundy, Iroquois, Kankakee, Kendall, LaSalle and 2 more	65 min
May 7, 6:58 PM CDT	Severe Thunderstorm Watch	SPC	Ford, Grundy, Iroquois, Kankakee, Kendall, LaSalle and 5 more	5 hr
May 7, 8:28 AM CDT	Mesoscale Discussion	SPC	Clark, Floyd, Harrison	92 min

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.