Alert archive / Wisconsin / Mesoscale Discussions in 2016

Mesoscale Discussion 1371

July 23, 2016Boone County, McHenry County, Winnebago County, Illinois; 7 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 23, 2016, 1:06 PM CDT for Boone County, McHenry County, Winnebago County, Illinois; 7 counties in Wisconsin. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 23, 2016, 1:06 PM CDT (18:06 UTC)
Expired: Jul 23, 2016, 3:30 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Boone County, IL, McHenry County, IL, Winnebago County, IL, Dane County, WI, Green County, WI, Jefferson County, WI, Kenosha County, WI, Rock County, WI, Walworth County, WI, Waukesha County, WI

The radar

The Milwaukee radar (KMKX), 38 km from the middle of the area, began a volume at 18:06 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 412Jul 23, 3:20 PM CDT

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 6.1 hours before the alert went out and 188 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: 2607 J/kg
Mixed-layer CIN: -89 J/kg
Mixed-layer LCL: 807 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 83 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
Jul 23, 2:50 PM CDT	Mesoscale Discussion	SPC	Boone, Carroll, DeKalb, Jo Daviess, Kane, McHenry and 3 more	25 min
Jul 23, 3:23 PM CDT	Severe Thunderstorm Watch	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 16 more	7 hr
Jul 23, 5:25 PM CDT	Mesoscale Discussion	SPC	Boone, Carroll, DeKalb, DuPage, Jo Daviess, Kane and 8 more	2 hr
Jul 23, 8:58 AM CDT	Mesoscale Discussion	SPC	Buffalo, Crawford, Grant, La Crosse, Monroe, Pierce and 3 more	3 hr
Jul 23, 2:08 PM CDT	Mesoscale Discussion	SPC	Crawford, Grant	3 hr

Nearby

Mesoscale Discussions in Wisconsin, 2016 Mesoscale Discussions in Illinois, 2016 Every mesoscale discussion in 2016

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.