Alert archive / Wisconsin / Mesoscale Discussions in 2016

Mesoscale Discussion 1477

August 4, 20164 states

The Storm Prediction Center issued this mesoscale discussion at Aug 4, 2016, 12:15 PM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 4, 2016, 12:15 PM CDT (17:15 UTC)
Expired: Aug 4, 2016, 2:15 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 53 counties

Allamakee County, IA, Benton County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Cedar County, IA, Clayton County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Grundy County, IA, Iowa County, IA, Jackson County, IA, Johnson County, IA, Jones County, IA, Linn County, IA, Tama County, IA, Jo Daviess County, IL, Menominee County, MI, Adams County, WI, Brown County, WI, Calumet County, WI, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Door County, WI, Fond du Lac County, WI, Forest County, WI, Grant County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Juneau County, WI, Kewaunee County, WI, Lafayette County, WI, Langlade County, WI, Manitowoc County, WI, Marinette County, WI, Marquette County, WI, Menominee County, WI, Monroe County, WI, Oconto County, WI, Outagamie County, WI, Portage County, WI, Richland County, WI, Sauk County, WI, Shawano County, WI, Vernon County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI

The radar

The La Crosse radar (KARX), 85 km from the middle of the area, began a volume at 17:18 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, 5.3 hours before the alert went out and 183 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: 933 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 869 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -56 m²/s²
0-3 km storm-relative helicity: -24 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
Aug 4, 4:44 PM CDT	Severe Thunderstorm Watch	SPC	Carroll, Jo Daviess, Rock Island, Stephenson, Whiteside	6 hr
Aug 4, 4:48 PM CDT	Mesoscale Discussion	SPC	Jo Daviess	87 min
Aug 4, 3:58 AM CDT	Mesoscale Discussion	SPC	Dickinson, Osceola	62 min
Aug 4, 4:44 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Cass, Fremont, Mills, Montgomery and 2 more	3 hr

Nearby

Mesoscale Discussions in Wisconsin, 2016 Mesoscale Discussions in Iowa, 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.