Alert archive / Wisconsin / Mesoscale Discussions in 2007

Mesoscale Discussion 307

March 21, 20077 counties in Illinois; 12 counties in Michigan; 36 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Mar 21, 2007, 5:15 PM CDT for 7 counties in Illinois; 12 counties in Michigan; 36 counties in Wisconsin. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Mar 21, 2007, 5:15 PM CDT (22:15 UTC)
Expired: Mar 21, 2007, 7:15 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 55 counties

Boone County, IL, Cook County, IL, DuPage County, IL, Kane County, IL, Lake County, IL, McHenry County, IL, Winnebago County, IL, Allegan County, MI, Benzie County, MI, Berrien County, MI, Kent County, MI, Lake County, MI, Manistee County, MI, Mason County, MI, Muskegon County, MI, Newaygo County, MI, Oceana County, MI, Ottawa County, MI, Van Buren County, MI, Adams County, WI, Brown County, WI, Calumet County, WI, Columbia County, WI, Dane County, WI, Dodge County, WI, Fond du Lac County, WI, Green County, WI, Green Lake County, WI, Jackson County, WI, Jefferson County, WI, Juneau County, WI, Kenosha County, WI, Kewaunee County, WI, La Crosse County, WI, Manitowoc County, WI, Marquette County, WI, Milwaukee County, WI, Monroe County, WI, Outagamie County, WI, Ozaukee County, WI, Portage County, WI, Racine County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Shawano County, WI, Sheboygan County, WI, Vernon County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI

The radar

The Milwaukee radar (KMKX), 63 km from the middle of the area, began a volume at 22:16 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, 10.3 hours before the alert went out and 118 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 587 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 64 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
Mar 21, 9:44 AM CDT	Mesoscale Discussion	SPC	Adams, Hancock, Henderson	2 hr
Mar 21, 12:30 PM CDT	Mesoscale Discussion	SPC	Boone, Carroll, Henry, Jo Daviess, Knox, Lee and 7 more	90 min
Mar 21, 1:26 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Henry, Jo Daviess, Lee and 7 more	64 min
Mar 21, 4:21 AM CDT	Mesoscale Discussion	SPC	Barry, Branch, Calhoun, Clare, Clinton, Eaton and 21 more	4 hr

Nearby

Mesoscale Discussions in Wisconsin, 2007 Mesoscale Discussions in Michigan, 2007 Mesoscale Discussions in Illinois, 2007 Every mesoscale discussion in 2007

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.