Alert archive / Wisconsin / Mesoscale Discussions in 2005

Mesoscale Discussion 796

May 9, 200515 counties in Illinois; 27 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at May 9, 2005, 3:31 PM CDT for 15 counties in Illinois; 27 counties in Wisconsin. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: May 9, 2005, 3:31 PM CDT (20:31 UTC)
Expired: May 9, 2005, 5:00 PM CDT
In force: 89 min
Issued by: the Storm Prediction Center

All 42 counties

Boone County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Kane County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, McHenry County, IL, Ogle County, IL, Stephenson County, IL, Will County, IL, Winnebago County, IL, Adams 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, Jefferson County, WI, Juneau County, WI, Kenosha County, WI, Marathon County, WI, Marquette County, WI, Menominee County, WI, Milwaukee County, WI, Outagamie County, WI, Portage County, WI, Rock County, WI, Sauk County, WI, Shawano 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), 42 km from the middle of the area, began a volume at 20:32 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, 8.5 hours before the alert went out and 167 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: 1034 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: -56 m²/s²
0-3 km storm-relative helicity: 19 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
May 9, 12:00 PM CDT	Mesoscale Discussion	SPC	Boone, Cook, DeKalb, DuPage, Ford, Grundy and 15 more	90 min
May 9, 12:45 PM CDT	Severe Thunderstorm Watch	SPC	Boone, Bureau, Cook, DeKalb, DuPage, Grundy and 11 more	7 hr
May 9, 5:32 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Cook, DeKalb, DuPage, Grundy and 11 more	28 min
May 8, 7:14 PM CDT	Mesoscale Discussion	SPC	Barron, Buffalo, Burnett, Dunn, Pepin, Pierce and 3 more	2 hr
May 9, 12:58 PM CDT	Mesoscale Discussion	SPC	Barron, Buffalo, Burnett, Chippewa, Clark, Dunn and 11 more	92 min

Nearby

Mesoscale Discussions in Wisconsin, 2005 Mesoscale Discussions in Illinois, 2005 Every mesoscale discussion in 2005

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.