Alert archive / Illinois / Mesoscale Discussions in 2016

Mesoscale Discussion 432

April 21, 201642 counties in Illinois; Vermillion County, Indiana; 4 counties in Iowa

The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2016, 1:29 PM CDT for 42 counties in Illinois; Vermillion County, Indiana; 4 counties in Iowa. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Apr 21, 2016, 1:29 PM CDT (18:29 UTC)
Expired: Apr 21, 2016, 4:00 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 47 counties

Clinton County, IA, Jackson County, IA, Jones County, IA, Scott County, IA, Bond County, IL, Bureau 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, Fulton County, IL, Grundy County, IL, Henry County, IL, Iroquois County, IL, Knox County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marshall County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Montgomery County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Putnam County, IL, Rock Island County, IL, Sangamon County, IL, Shelby County, IL, Stark County, IL, Tazewell County, IL, Vermilion County, IL, Whiteside County, IL, Woodford County, IL, Vermillion County, IN

The radar

The Lincoln radar (KILX), 26 km from the middle of the area, began a volume at 18:29 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 12:00Z, 6.5 hours before the alert went out and 83 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: 14 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 672 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: 28 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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Nearby

Mesoscale Discussions in Illinois, 2016 Mesoscale Discussions in Iowa, 2016 Mesoscale Discussions in Indiana, 2016 Every mesoscale discussion in 2016

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.