Alert archive / Illinois / Mesoscale Discussions in 2019

Mesoscale Discussion 70

February 5, 201917 counties in Illinois; 9 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Feb 5, 2019, 5:56 PM CST for 17 counties in Illinois; 9 counties in Wisconsin. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Feb 5, 2019, 5:56 PM CST (23:56 UTC)
Expired: Feb 6, 2019, 12:00 AM CST
In force: 6 hr
Issued by: the Storm Prediction Center

All 26 counties

Boone County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Kane County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, McHenry County, IL, Ogle County, IL, Putnam County, IL, Will County, IL, Winnebago County, IL, Dodge County, WI, Jefferson County, WI, Kenosha County, WI, Milwaukee County, WI, Racine County, WI, Rock County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI

The radar

The Milwaukee radar (KMKX), 71 km from the middle of the area, began a volume at 23:54 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

Green Bay/Straub, WI (KGRB), launched 12:00Z, 11.9 hours before the alert went out and 235 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: 809 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: -30 m²/s²
0-3 km storm-relative helicity: 96 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
Feb 5, 1:37 PM CST	Mesoscale Discussion	SPC	Bureau, Carroll, Henderson, Henry, Jo Daviess, Lee and 7 more	5 hr
Feb 5, 1:20 PM CST	Mesoscale Discussion	SPC	Barron, Buffalo, Chippewa, Dunn, Eau Claire, Pepin and 5 more	5 hr

Nearby

Mesoscale Discussions in Illinois, 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.