Alert archive / Illinois / Mesoscale Discussions in 2019

Mesoscale Discussion 768

May 24, 201934 counties in Illinois; Pike County, Missouri

The Storm Prediction Center issued this mesoscale discussion at May 24, 2019, 12:15 PM CDT for 34 counties in Illinois; Pike County, Missouri. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: May 24, 2019, 12:15 PM CDT (17:15 UTC)
Expired: May 24, 2019, 1:45 PM CDT
In force: 90 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 35 counties

Adams County, IL, Brown County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, Coles County, IL, DeWitt County, IL, Douglas County, IL, Ford County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Knox County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Morgan County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Pike County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Tazewell County, IL, Warren County, IL, Woodford County, IL, Pike County, MO

The radar

The Lincoln radar (KILX), 56 km from the middle of the area, began a volume at 17:19 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.

Tornado Watch 231May 24, 12:35 PM CDT

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 5.3 hours before the alert went out and 115 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: 83 J/kg
Mixed-layer CIN: -282 J/kg
Mixed-layer LCL: 943 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 301 m²/s²
0-3 km storm-relative helicity: 344 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

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, 12:36 PM CDT	Tornado Watch	SPC	Cass, Champaign, DeWitt, Ford, Fulton, Iroquois and 15 more	4 hr
May 24, 3:25 PM CDT	Mesoscale Discussion	SPC	Carroll, Henderson, Henry, Jo Daviess, Knox, Mercer and 5 more	65 min
May 24, 6:23 PM CDT	Tornado Watch	SPC	Bureau, Carroll, Fulton, Grundy, Hancock, Henderson and 24 more	4 hr
May 24, 4:05 AM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, Buchanan, Caldwell, Clay, Clinton and 10 more	115 min
May 24, 4:40 AM CDT	Severe Thunderstorm Watch	SPC	Andrew, Atchison, Daviess, DeKalb, Gentry, Grundy and 7 more	4 hr
May 24, 6:43 AM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, Daviess, DeKalb, Gentry, Grundy and 7 more	2 hr
May 24, 3:56 PM CDT	Mesoscale Discussion	SPC	Adair, Andrew, Buchanan, Caldwell, Carroll, Chariton and 21 more	94 min
May 24, 6:04 PM CDT	Tornado Watch	SPC	Adair, Audrain, Bates, Benton, Boone, Buchanan and 36 more	5 hr

Nearby

Mesoscale Discussions in Illinois, 2019 Mesoscale Discussions in Missouri, 2019 Every mesoscale discussion in 2019

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.