Alert archive / Wisconsin / Mesoscale Discussions in 2015

Mesoscale Discussion 1678

August 14, 201512 counties in Michigan; 15 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Aug 14, 2015, 1:02 PM EDT for 12 counties in Michigan; 15 counties in Wisconsin. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Aug 14, 2015, 1:02 PM EDT (17:02 UTC)
Expired: Aug 14, 2015, 2:00 PM EDT
In force: 58 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 27 counties

Antrim County, MI, Benzie County, MI, Charlevoix County, MI, Delta County, MI, Dickinson County, MI, Emmet County, MI, Grand Traverse County, MI, Leelanau County, MI, Mackinac County, MI, Menominee County, MI, Otsego County, MI, Schoolcraft County, MI, Brown County, WI, Door County, WI, Florence County, WI, Forest County, WI, Kewaunee County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Marinette County, WI, Menominee County, WI, Oconto County, WI, Oneida County, WI, Price County, WI, Shawano County, WI, Taylor County, WI

The radar

The Green Bay radar (KGRB), 106 km from the middle of the area, began a volume at 17:04 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, 5.0 hours before the alert went out and 108 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: 2294 J/kg
Mixed-layer CIN: -78 J/kg
Mixed-layer LCL: 950 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 61 m²/s²
0-3 km storm-relative helicity: 151 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 14, 4:09 PM EDT	Mesoscale Discussion	SPC	Arenac, Bay, Benzie, Clare, Crawford, Gladwin and 20 more	66 min

Nearby

Mesoscale Discussions in Wisconsin, 2015 Mesoscale Discussions in Michigan, 2015 Every mesoscale discussion in 2015

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.