Alert archive / Illinois / Mesoscale Discussions in 2020

Mesoscale Discussion 585

May 14, 202022 counties in Illinois; 9 counties in Iowa; Clark County, Missouri

The Storm Prediction Center issued this mesoscale discussion at May 14, 2020, 5:19 PM CDT for 22 counties in Illinois; 9 counties in Iowa; Clark County, Missouri. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: May 14, 2020, 5:19 PM CDT (22:19 UTC)
Expired: May 14, 2020, 7:15 PM CDT
In force: 116 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 32 counties

Des Moines County, IA, Henry County, IA, Jefferson County, IA, Lee County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Washington County, IA, Bureau County, IL, Fulton County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Knox County, IL, LaSalle County, IL, Livingston County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Mercer County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Schuyler County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Woodford County, IL, Clark County, MO

The radar

The Quad Cities radar (KDVN), 82 km from the middle of the area, began a volume at 22:19 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.

Severe Thunderstorm Watch 183May 14, 6:15 PM CDT

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.3 hours before the alert went out and 82 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: 21 J/kg
Mixed-layer CIN: -218 J/kg
Mixed-layer LCL: 472 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 375 m²/s²
0-3 km storm-relative helicity: 374 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
May 14, 6:15 PM CDT	Severe Thunderstorm Watch	SPC	Bureau, Cook, DeKalb, DuPage, Fulton, Grundy and 21 more	8 hr
May 13, 11:48 PM CDT	Mesoscale Discussion	SPC	Adams, Decatur, Fremont, Mills, Montgomery, Page and 2 more	2 hr
May 14, 3:55 PM CDT	Mesoscale Discussion	SPC	Appanoose, Clarke, Davis, Decatur, Jefferson, Lucas and 6 more	95 min
May 14, 4:24 PM CDT	Severe Thunderstorm Watch	SPC	Appanoose, Clarke, Dallas, Davis, Decatur, Jasper and 13 more	9 hr
May 14, 6:01 PM CDT	Mesoscale Discussion	SPC	Appanoose, Clarke, Decatur, Lucas, Ringgold, Wayne	119 min
May 14, 1:41 PM CDT	Mesoscale Discussion	SPC	Barry, Barton, Bates, Benton, Camden, Cedar and 29 more	2 hr

Nearby

Mesoscale Discussions in Illinois, 2020 Mesoscale Discussions in Iowa, 2020 Mesoscale Discussions in Missouri, 2020 Every mesoscale discussion in 2020

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.