Alert archive / Illinois / Mesoscale Discussions in 2016

Mesoscale Discussion 1391

July 24, 201615 counties in Illinois; Lee County, Iowa; 6 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jul 24, 2016, 6:03 PM CDT for 15 counties in Illinois; Lee County, Iowa; 6 counties in Missouri. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Jul 24, 2016, 6:03 PM CDT (23:03 UTC)
Expired: Jul 24, 2016, 7:30 PM CDT
In force: 87 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 22 counties

Lee County, IA, Adams County, IL, Brown County, IL, Cass County, IL, Fulton County, IL, Hancock County, IL, Knox County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Morgan County, IL, Pike County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Warren County, IL, Clark County, MO, Knox County, MO, Lewis County, MO, Marion County, MO, Ralls County, MO, Shelby County, MO

The radar

The Lincoln radar (KILX), 117 km from the middle of the area, began a volume at 23:04 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

Davenport, (KDVN), launched 12:00Z, 11.1 hours before the alert went out and 169 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: 2068 J/kg
Mixed-layer CIN: -112 J/kg
Mixed-layer LCL: 1249 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 129 m²/s²
0-3 km storm-relative helicity: 149 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

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 23, 8:35 PM CDT	Mesoscale Discussion	SPC	Bureau, Cook, DeKalb, DuPage, Kane, Kendall and 4 more	85 min
Jul 24, 2:25 PM CDT	Mesoscale Discussion	SPC	Boone, Cook, DeKalb, DuPage, Grundy, Kane and 5 more	3 hr
Jul 24, 5:42 PM CDT	Mesoscale Discussion	SPC	Champaign, Cook, DuPage, Ford, Grundy, Iroquois and 10 more	93 min

Nearby

Mesoscale Discussions in Illinois, 2016 Mesoscale Discussions in Missouri, 2016 Mesoscale Discussions in Iowa, 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.