Alert archive / Michigan / Mesoscale Discussions in 2016

Mesoscale Discussion 1646

September 6, 201618 counties in Michigan; 10 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Sep 6, 2016, 1:25 PM EDT for 18 counties in Michigan; 10 counties in Wisconsin. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Sep 6, 2016, 1:25 PM EDT (17:25 UTC)
Expired: Sep 6, 2016, 4:00 PM EDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 28 counties

Antrim County, MI, Benzie County, MI, Charlevoix County, MI, Clare County, MI, Crawford County, MI, Delta County, MI, Grand Traverse County, MI, Kalkaska County, MI, Lake County, MI, Leelanau County, MI, Manistee County, MI, Mason County, MI, Menominee County, MI, Missaukee County, MI, Osceola County, MI, Otsego County, MI, Roscommon County, MI, Wexford County, MI, Brown County, WI, Calumet County, WI, Door County, WI, Kewaunee County, WI, Manitowoc County, WI, Marinette County, WI, Menominee County, WI, Oconto County, WI, Outagamie County, WI, Shawano County, WI

The radar

The Green Bay radar (KGRB), 133 km from the middle of the area, began a volume at 17:24 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, 5.4 hours before the alert went out and 132 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: 583 J/kg
Mixed-layer CIN: -107 J/kg
Mixed-layer LCL: 1042 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 193 m²/s²
0-3 km storm-relative helicity: 180 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.0

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
Sep 6, 3:22 PM EDT	Mesoscale Discussion	SPC	Adams, Buffalo, Clark, Columbia, Eau Claire, Fond du Lac and 19 more	2 hr
Sep 6, 6:18 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Calumet, Columbia, Crawford, Dodge and 20 more	4 hr

Nearby

Mesoscale Discussions in Michigan, 2016 Mesoscale Discussions in Wisconsin, 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.