Alert archive / Wisconsin / Mesoscale Discussions in 2014

Mesoscale Discussion 1680

September 4, 2014Allamakee County, Iowa; Houston County, Winona County, Minnesota; 35 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Sep 4, 2014, 5:04 PM CDT for Allamakee County, Iowa; Houston County, Winona County, Minnesota; 35 counties in Wisconsin. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Sep 4, 2014, 5:04 PM CDT (22:04 UTC)
Expired: Sep 4, 2014, 6:30 PM CDT
In force: 86 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 38 counties

Allamakee County, IA, Houston County, MN, Winona County, MN, Adams County, WI, Brown County, WI, Calumet County, WI, Clark County, WI, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Eau Claire County, WI, Fond du Lac County, WI, Grant County, WI, Green Lake County, WI, Iowa County, WI, Jackson County, WI, Jefferson County, WI, Juneau County, WI, La Crosse County, WI, Marathon County, WI, Marquette County, WI, Menominee County, WI, Monroe County, WI, Outagamie County, WI, Ozaukee County, WI, Portage County, WI, Richland County, WI, Sauk County, WI, Shawano County, WI, Trempealeau County, WI, Vernon County, WI, Washington County, WI, Waukesha County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI

The radar

The La Crosse radar (KARX), 114 km from the middle of the area, began a volume at 22:06 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, 10.1 hours before the alert went out and 157 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 3, 10:41 PM CDT	Mesoscale Discussion	SPC	Allamakee	79 min
Sep 3, 8:00 PM CDT	Mesoscale Discussion	SPC	Chisago	90 min
Sep 4, 1:17 AM CDT	Mesoscale Discussion	SPC	Becker, Clay, Douglas, Grant, Mahnomen, Norman and 4 more	88 min
Sep 4, 1:48 AM CDT	Severe Thunderstorm Watch	SPC	Becker, Clay, Clearwater, Grant, Hubbard, Mahnomen and 4 more	5 hr
Sep 4, 4:43 AM CDT	Mesoscale Discussion	SPC	Aitkin, Becker, Chisago, Clay, Crow Wing, Isanti and 8 more	2 hr
Sep 4, 5:02 AM CDT	Severe Thunderstorm Watch	SPC	Aitkin, Benton, Carlton, Cass, Chisago, Crow Wing and 7 more	5 hr
Sep 4, 7:21 AM CDT	Mesoscale Discussion	SPC	Aitkin, Crow Wing, Kanabec, Mille Lacs, Pine	114 min
Sep 3, 8:22 PM CDT	Severe Thunderstorm Watch	SPC	Barron, Chippewa, Clark, Dunn, Eau Claire, Polk and 5 more	3 hr
Sep 4, 7:42 AM CDT	Severe Thunderstorm Watch	SPC	Ashland, Bayfield, Florence, Forest, Iron, Langlade and 10 more	4 hr
Sep 4, 10:25 AM CDT	Mesoscale Discussion	SPC	Brown, Calumet, Clark, Florence, Forest, Kewaunee and 18 more	65 min

Nearby

Mesoscale Discussions in Wisconsin, 2014 Mesoscale Discussions in Minnesota, 2014 Mesoscale Discussions in Iowa, 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.