Alert archive / Wisconsin / Mesoscale Discussions in 2011

Mesoscale Discussion 1569

July 11, 201133 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 11, 2011, 2:07 AM CDT for 33 counties in Wisconsin. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Jul 11, 2011, 2:07 AM CDT (07:07 UTC)
Expired: Jul 11, 2011, 3:30 AM CDT
In force: 83 min
Issued by: the Storm Prediction Center

All 33 counties

Adams County, WI, Brown County, WI, Calumet County, WI, Clark County, WI, Columbia County, WI, Dodge County, WI, Fond du Lac County, WI, Green Lake County, WI, Jackson County, WI, Juneau County, WI, Kewaunee County, WI, La Crosse County, WI, Langlade County, WI, Lincoln County, WI, Manitowoc County, WI, Marathon County, WI, Marquette County, WI, Menominee County, WI, Monroe County, WI, Oconto County, WI, Outagamie County, WI, Ozaukee County, WI, Portage County, WI, Richland County, WI, Sauk County, WI, Shawano County, WI, Sheboygan County, WI, Vernon County, WI, Washington County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI

The radar

The Green Bay radar (KGRB), 106 km from the middle of the area, began a volume at 07:07 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 7.1 hours before the alert went out and 106 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: 2402 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 653 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 155 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 6.8

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
Jul 10, 7:51 PM CDT	Mesoscale Discussion	SPC	Buffalo, Crawford, Dunn, Eau Claire, La Crosse, Pepin and 4 more	84 min
Jul 10, 9:53 PM CDT	Mesoscale Discussion	SPC	Buffalo, Crawford, Dunn, Eau Claire, Jackson, La Crosse and 7 more	67 min
Jul 10, 10:10 PM CDT	Severe Thunderstorm Watch	SPC	Barron, Buffalo, Chippewa, Dunn, Eau Claire, La Crosse and 6 more	6 hr
Jul 10, 11:45 PM CDT	Mesoscale Discussion	SPC	Buffalo, Chippewa, Crawford, Dunn, Eau Claire, Jackson and 7 more	90 min
Jul 11, 3:30 AM CDT	Severe Thunderstorm Watch	SPC	Columbia, Crawford, Dane, Dodge, Fond du Lac, Grant and 18 more	6 hr
Jul 11, 5:07 AM CDT	Mesoscale Discussion	SPC	Crawford, Dane, Dodge, Fond du Lac, Grant, Green and 14 more	113 min
Jul 11, 7:10 AM CDT	Mesoscale Discussion	SPC	Dane, Green, Jefferson, Kenosha, Milwaukee, Racine and 3 more	95 min
Jul 11, 7:50 AM CDT	Mesoscale Discussion	SPC	Kenosha	55 min

Nearby

Mesoscale Discussions in Wisconsin, 2011 Every mesoscale discussion in 2011

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.