Alert archive / Illinois / Mesoscale Discussions in 2018

Mesoscale Discussion 731

June 14, 20189 counties in Illinois; Des Moines County, Lee County, Iowa; 9 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jun 14, 2018, 1:17 PM CDT for 9 counties in Illinois; Des Moines County, Lee County, Iowa; 9 counties in Missouri. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Jun 14, 2018, 1:17 PM CDT (18:17 UTC)
Expired: Jun 14, 2018, 3:15 PM CDT
In force: 118 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Des Moines County, IA, Lee County, IA, Adams County, IL, Brown County, IL, Fulton County, IL, Hancock County, IL, Henderson County, IL, McDonough County, IL, Pike County, IL, Schuyler County, IL, Warren County, IL, Adair County, MO, Clark County, MO, Knox County, MO, Lewis County, MO, Macon County, MO, Marion County, MO, Monroe County, MO, Ralls County, MO, Shelby County, MO

The radar

The Quad Cities radar (KDVN), 168 km from the middle of the area, began a volume at 18:20 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, 6.3 hours before the alert went out and 172 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2104 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 94 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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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 14, 5:18 PM CDT	Mesoscale Discussion	SPC	Madison, Monroe, Saint Clair	57 min
Jun 13, 11:56 PM CDT	Mesoscale Discussion	SPC	Audubon, Buena Vista, Calhoun, Carroll, Cherokee, Clay and 13 more	3 hr

Nearby

Mesoscale Discussions in Illinois, 2018 Mesoscale Discussions in Missouri, 2018 Mesoscale Discussions in Iowa, 2018 Every mesoscale discussion in 2018

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.