Alert archive / Illinois / Mesoscale Discussions in 2022

Mesoscale Discussion 1749

August 29, 202233 counties in Illinois; 8 counties in Indiana; Pike County, Missouri

The Storm Prediction Center issued this mesoscale discussion at Aug 29, 2022, 8:31 PM CDT for 33 counties in Illinois; 8 counties in Indiana; Pike County, Missouri. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Aug 29, 2022, 8:31 PM CDT (01:31 UTC)
Expired: Aug 29, 2022, 10:30 PM CDT
In force: 119 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 530

All 42 counties

Adams County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Coles County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Fayette County, IL, Ford County, IL, Greene County, IL, Iroquois County, IL, Jersey County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Piatt County, IL, Pike County, IL, Sangamon County, IL, Scott County, IL, Shelby County, IL, Vermilion County, IL, Benton County, IN, Fountain County, IN, Montgomery County, IN, Parke County, IN, Tippecanoe County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN, Pike County, MO

The radar

The Lincoln radar (KILX), 43 km from the middle of the area, began a volume at 01:31 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, 1.5 hours before the alert went out and 56 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: 2551 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 899 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 153 m²/s²
0-3 km storm-relative helicity: 169 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.2

Open this sounding in Storm Lab

The text

As transmitted.

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Nearby

Mesoscale Discussions in Illinois, 2022 Mesoscale Discussions in Indiana, 2022 Mesoscale Discussions in Missouri, 2022 Every mesoscale discussion in 2022

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.