Alert archive / Wisconsin / Mesoscale Discussions in 2003

Mesoscale Discussion 2252

August 25, 20035 counties in Illinois; 8 counties in Michigan; 15 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Aug 25, 2003, 6:43 PM CDT for 5 counties in Illinois; 8 counties in Michigan; 15 counties in Wisconsin. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 25, 2003, 6:43 PM CDT (23:43 UTC)
Expired: Aug 25, 2003, 8:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 28 counties

Boone County, IL, Lake County, IL, McHenry County, IL, Stephenson County, IL, Winnebago County, IL, Allegan County, MI, Barry County, MI, Calhoun County, MI, Eaton County, MI, Kalamazoo County, MI, Kent County, MI, Ottawa County, MI, Van Buren County, MI, Columbia County, WI, Dane County, WI, Dodge County, WI, Green County, WI, Iowa County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Milwaukee County, WI, Racine County, WI, Rock County, WI, Sauk County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI

The radar

The Milwaukee radar (KMKX), 42 km from the middle of the area, began a volume at 23:42 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, 11.7 hours before the alert went out and 188 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: 608 J/kg
Mixed-layer CIN: -237 J/kg
Mixed-layer LCL: 1299 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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 25, 5:41 PM CDT	Mesoscale Discussion	SPC	Alpena, Antrim, Charlevoix, Cheboygan, Chippewa, Crawford and 14 more	94 min
Aug 25, 11:33 AM CDT	Mesoscale Discussion	SPC	Barron, Buffalo, Burnett, Chippewa, Clark, Dunn and 17 more	117 min
Aug 25, 5:20 PM CDT	Severe Thunderstorm Watch	SPC	Crawford, Grant, La Crosse, Monroe, Vernon	6 hr

Nearby

Mesoscale Discussions in Wisconsin, 2003 Mesoscale Discussions in Michigan, 2003 Mesoscale Discussions in Illinois, 2003 Every mesoscale discussion in 2003

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.