Alert archive / Wisconsin / Mesoscale Discussions in 2017

Mesoscale Discussion 1665

September 22, 201710 counties in Michigan; 12 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Sep 22, 2017, 11:20 AM EDT for 10 counties in Michigan; 12 counties in Wisconsin. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Sep 22, 2017, 11:20 AM EDT (15:20 UTC)
Expired: Sep 22, 2017, 12:45 PM EDT
In force: 85 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 22 counties

Alger County, MI, Baraga County, MI, Delta County, MI, Dickinson County, MI, Gogebic County, MI, Houghton County, MI, Iron County, MI, Marquette County, MI, Menominee County, MI, Ontonagon County, MI, Florence County, WI, Forest County, WI, Iron County, WI, Langlade County, WI, Lincoln County, WI, Marinette County, WI, Oneida County, WI, Price County, WI, Rusk County, WI, Sawyer County, WI, Taylor County, WI, Vilas County, WI

The radar

The Marquette radar (KMQT), 163 km from the middle of the area, began a volume at 15:20 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, 3.3 hours before the alert went out and 193 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: 1154 J/kg
Mixed-layer CIN: -146 J/kg
Mixed-layer LCL: 1441 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -81 m²/s²
0-3 km storm-relative helicity: -57 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
Sep 22, 5:10 AM EDT	Mesoscale Discussion	SPC	Douglas	3 hr

Nearby

Mesoscale Discussions in Wisconsin, 2017 Mesoscale Discussions in Michigan, 2017 Every mesoscale discussion in 2017

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.