Alert archive / Wisconsin / Mesoscale Discussions in 2014

Mesoscale Discussion 1678

September 4, 2014Iron County, Menominee County, Michigan; 24 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Sep 4, 2014, 10:25 AM CDT for Iron County, Menominee County, Michigan; 24 counties in Wisconsin. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: Sep 4, 2014, 10:25 AM CDT (15:25 UTC)
Expired: Sep 4, 2014, 11:30 AM CDT
In force: 65 min
Issued by: the Storm Prediction Center

All 26 counties

Iron County, MI, Menominee County, MI, Brown County, WI, Calumet County, WI, Clark County, WI, Florence County, WI, Forest County, WI, Kewaunee County, WI, Langlade County, WI, Lincoln County, WI, Manitowoc County, WI, Marathon County, WI, Marinette County, WI, Menominee County, WI, Oconto County, WI, Oneida County, WI, Outagamie County, WI, Portage County, WI, Price County, WI, Shawano County, WI, Taylor County, WI, Vilas County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI

The radar

The Green Bay radar (KGRB), 103 km from the middle of the area, began a volume at 15:27 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, 3.4 hours before the alert went out and 105 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: 503 J/kg
Mixed-layer CIN: -192 J/kg
Mixed-layer LCL: 672 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 99 m²/s²
0-3 km storm-relative helicity: 147 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

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
Sep 4, 7:21 AM CDT	Mesoscale Discussion	SPC	Menominee	114 min
Sep 4, 7:42 AM CDT	Severe Thunderstorm Watch	SPC	Dickinson, Gogebic, Iron, Menominee	4 hr
Sep 4, 12:49 PM CDT	Mesoscale Discussion	SPC	Antrim, Benzie, Charlevoix, Cheboygan, Crawford, Emmet and 13 more	56 min
Sep 3, 8:00 PM CDT	Mesoscale Discussion	SPC	Barron, Burnett, Chippewa, Clark, Dunn, Eau Claire and 5 more	90 min
Sep 3, 8:22 PM CDT	Severe Thunderstorm Watch	SPC	Barron, Chippewa, Clark, Dunn, Eau Claire, Polk and 5 more	3 hr
Sep 3, 10:41 PM CDT	Mesoscale Discussion	SPC	Adams, Buffalo, Clark, Crawford, Eau Claire, Jackson and 11 more	79 min
Sep 4, 4:43 AM CDT	Mesoscale Discussion	SPC	Barron, Burnett, Polk, Rusk, Sawyer, Washburn	2 hr
Sep 4, 5:02 AM CDT	Severe Thunderstorm Watch	SPC	Barron, Burnett, Douglas, Polk, Rusk, Washburn	5 hr
Sep 4, 5:04 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Calumet, Clark, Columbia, Crawford and 29 more	86 min

Nearby

Mesoscale Discussions in Wisconsin, 2014 Mesoscale Discussions in Michigan, 2014 Every mesoscale discussion in 2014

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.