Alert archive / Illinois / Mesoscale Discussions in 2020

Mesoscale Discussion 838

June 5, 20207 counties in Illinois; Des Moines County, Henry County, Lee County, Iowa; 4 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jun 5, 2020, 7:59 AM CDT for 7 counties in Illinois; Des Moines County, Henry County, Lee County, Iowa; 4 counties in Missouri. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Jun 5, 2020, 7:59 AM CDT (12:59 UTC)
Expired: Jun 5, 2020, 9:30 AM CDT
In force: 91 min
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch unlikely
Chance of a watch: 5%

Counties Des Moines County, IA, Henry County, IA, Lee County, IA, Adams County, IL, Brown County, IL, Hancock County, IL, Henderson County, IL, McDonough County, IL, Pike County, IL, Warren County, IL, Clark County, MO, Lewis County, MO, Marion County, MO, Ralls County, MO

The radar

The Quad Cities radar (KDVN), 169 km from the middle of the area, began a volume at 13:04 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, 1.0 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: 897 J/kg
Mixed-layer CIN: -120 J/kg
Mixed-layer LCL: 1088 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.3

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 4, 10:50 PM CDT	Mesoscale Discussion	SPC	Jo Daviess	115 min
Jun 5, 12:26 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 13 more	94 min
Jun 4, 11:32 PM CDT	Severe Thunderstorm Watch	SPC	Fremont, Mills, Montgomery, Page	7 hr
Jun 5, 1:02 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Allamakee, Appanoose, Audubon, Benton, Black Hawk and 54 more	6 hr
Jun 5, 1:59 AM CDT	Mesoscale Discussion	SPC	Adams, Fremont, Mills, Montgomery, Page, Ringgold and 1 more	91 min
Jun 5, 4:17 AM CDT	Mesoscale Discussion	SPC	Appanoose, Benton, Black Hawk, Boone, Bremer, Buchanan and 34 more	88 min
Jun 5, 3:31 AM CDT	Mesoscale Discussion	SPC	Barton, Bates, Benton, Boone, Callaway, Camden and 24 more	89 min
Jun 5, 3:41 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Audrain, Barton, Benton, Boone, Callaway and 42 more	4 hr
Jun 5, 10:38 AM CDT	Mesoscale Discussion	SPC	Dunklin, Pemiscot	2 hr
Jun 5, 11:03 AM CDT	Severe Thunderstorm Watch	SPC	Dunklin, Pemiscot	6 hr

Nearby

Mesoscale Discussions in Illinois, 2020 Mesoscale Discussions in Missouri, 2020 Mesoscale Discussions in Iowa, 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.