Alert archive / Wisconsin / Mesoscale Discussions in 2011

Mesoscale Discussion 2044

August 23, 201118 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Aug 23, 2011, 4:56 PM CDT for 18 counties in Wisconsin. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Aug 23, 2011, 4:56 PM CDT (21:56 UTC)
Expired: Aug 23, 2011, 6:30 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center

Counties Adams County, WI, Brown County, WI, Calumet County, WI, Clark County, WI, Fond du Lac County, WI, Green Lake County, WI, Juneau County, WI, Lincoln County, WI, Marathon County, WI, Marquette County, WI, Menominee County, WI, Outagamie County, WI, Portage County, WI, Shawano County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI

The radar

The Green Bay radar (KGRB), 97 km from the middle of the area, began a volume at 21:56 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.

Tornado Watch 800Aug 23, 5:20 PM CDT

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 9.9 hours before the alert went out and 98 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: 45 J/kg
Mixed-layer CIN: -226 J/kg
Mixed-layer LCL: 1187 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 99 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 23, 3:10 AM CDT	Mesoscale Discussion	SPC	Burnett	2 hr
Aug 23, 4:55 AM CDT	Mesoscale Discussion	SPC	Barron, Buffalo, Chippewa, Clark, Crawford, Dunn and 12 more	2 hr
Aug 23, 5:19 PM CDT	Tornado Watch	SPC	Adams, Brown, Calumet, Columbia, Dodge, Fond du Lac and 20 more	6 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.