Alert archive / Illinois / Mesoscale Discussions in 2019

Mesoscale Discussion 933

June 1, 201920 counties in Illinois; 4 counties in Indiana; 4 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jun 1, 2019, 5:21 PM CDT for 20 counties in Illinois; 4 counties in Indiana; 4 counties in Wisconsin. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Jun 1, 2019, 5:21 PM CDT (22:21 UTC)
Expired: Jun 1, 2019, 6:15 PM CDT
In force: 54 min
Issued by: the Storm Prediction Center

All 28 counties

Boone County, IL, Bureau County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, McHenry County, IL, Ogle County, IL, Putnam County, IL, Stephenson County, IL, Will County, IL, Winnebago County, IL, Jasper County, IN, Lake County, IN, Newton County, IN, Porter County, IN, Kenosha County, WI, Racine County, WI, Rock County, WI, Walworth County, WI

The radar

The Chicago radar (KLOT), 38 km from the middle of the area, began a volume at 22:25 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, 10.4 hours before the alert went out and 176 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: 746 J/kg
Mixed-layer CIN: -192 J/kg
Mixed-layer LCL: 1709 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -45 m²/s²
0-3 km storm-relative helicity: -9 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 1, 2:05 PM CDT	Mesoscale Discussion	SPC	Boone, Lake, McHenry, Stephenson, Winnebago	115 min
Jun 1, 2:23 PM CDT	Severe Thunderstorm Watch	SPC	Boone, Cook, DeKalb, DuPage, Kane, Kendall and 6 more	6 hr
Jun 1, 3:02 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Cass, Fulton, Hancock, Henderson and 15 more	118 min
Jun 1, 3:33 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Bond, Brown, Calhoun, Cass, Christian and 15 more	7 hr
Jun 1, 6:07 PM CDT	Mesoscale Discussion	SPC	Adams, Bond, Brown, Calhoun, Cass, Christian and 13 more	83 min
Jun 1, 10:49 AM CDT	Mesoscale Discussion	SPC	LaGrange, Steuben	116 min
Jun 1, 3:58 PM CDT	Mesoscale Discussion	SPC	Allen, DeKalb, Elkhart, Kosciusko, LaGrange, LaPorte and 6 more	2 hr
Jun 1, 4:37 PM CDT	Severe Thunderstorm Watch	SPC	Allen, DeKalb, Elkhart, Kosciusko, LaGrange, LaPorte and 6 more	5 hr
Jun 1, 6:54 PM CDT	Mesoscale Discussion	SPC	DeKalb, Steuben	96 min

Nearby

Mesoscale Discussions in Illinois, 2019 Mesoscale Discussions in Indiana, 2019 Mesoscale Discussions in Wisconsin, 2019 Every mesoscale discussion in 2019

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.