Alert archive / Wisconsin / Mesoscale Discussions in 2011

Mesoscale Discussion 1656

July 18, 201127 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 18, 2011, 5:42 PM CDT for 27 counties in Wisconsin. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Jul 18, 2011, 5:42 PM CDT (22:42 UTC)
Expired: Jul 18, 2011, 6:45 PM CDT
In force: 63 min
Issued by: the Storm Prediction Center

All 27 counties

Adams County, WI, Brown County, WI, Calumet County, WI, Chippewa County, WI, Clark County, WI, Eau Claire County, WI, Forest County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Marinette County, WI, Menominee County, WI, Monroe County, WI, Oconto County, WI, Outagamie County, WI, Portage County, WI, Rusk County, WI, Shawano County, WI, Taylor County, WI, Trempealeau County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI

The radar

The Green Bay radar (KGRB), 150 km from the middle of the area, began a volume at 22:42 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, 10.7 hours before the alert went out and 151 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: 3928 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 613 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 106 m²/s²
0-3 km storm-relative helicity: 111 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 9.7

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 17, 7:22 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Calumet, Door, Florence, Forest, Kewaunee and 17 more	4 hr
Jul 17, 9:24 PM CDT	Mesoscale Discussion	SPC	Door, Florence, Forest, Kewaunee, Langlade, Lincoln and 9 more	66 min
Jul 17, 11:06 PM CDT	Mesoscale Discussion	SPC	Calumet, Fond du Lac, Kewaunee, Manitowoc, Sheboygan	54 min
Jul 18, 6:30 AM CDT	Mesoscale Discussion	SPC	Adams, Clark, Columbia, Crawford, Dane, Dodge and 25 more	2 hr
Jul 18, 8:05 AM CDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Buffalo, Calumet, Clark, Columbia and 32 more	4 hr
Jul 18, 9:54 AM CDT	Mesoscale Discussion	SPC	Manitowoc, Sheboygan	96 min
Jul 18, 2:06 PM CDT	Mesoscale Discussion	SPC	Barron, Brown, Chippewa, Clark, Dunn, Eau Claire and 17 more	84 min
Jul 18, 2:26 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Calumet, Chippewa, Clark, Door and 28 more	7 hr
Jul 18, 6:18 PM CDT	Severe Thunderstorm Watch	SPC	Columbia, Dane, Dodge, Fond du Lac, Green, Green Lake and 14 more	3 hr

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.