Alert archive / Wisconsin / Mesoscale Discussions in 2011

Mesoscale Discussion 866

May 22, 201129 counties in Illinois; 10 counties in Iowa; 33 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at May 22, 2011, 5:47 PM CDT for 29 counties in Illinois; 10 counties in Iowa; 33 counties in Wisconsin. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued
May 22, 2011, 5:47 PM CDT (22:47 UTC)
Expired
May 22, 2011, 7:15 PM CDT
In force
88 min
Issued by
the Storm Prediction Center
All 72 counties

Cedar County, IA, Clinton County, IA, Des Moines County, IA, Dubuque County, IA, Jackson County, IA, Johnson County, IA, Jones County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Kane County, IL, Kendall County, IL, Knox County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, McDonough County, IL, McHenry County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Warren County, IL, Whiteside County, IL, Winnebago County, IL, Woodford County, IL, Adams County, WI, Brown County, WI, Calumet County, WI, Columbia County, WI, Dane County, WI, Dodge County, WI, Fond du Lac County, WI, Grant County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Jefferson County, WI, Juneau County, WI, Kenosha County, WI, Lafayette County, WI, Marathon County, WI, Marquette County, WI, Menominee County, WI, Milwaukee County, WI, Outagamie County, WI, Ozaukee County, WI, Portage County, WI, Richland 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), 71 km from the middle of the area, began a volume at 22:47 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

Davenport, (KDVN), launched 12:00Z, 10.8 hours before the alert went out and 152 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-pSkew-T log-p diagram, Davenport, at 12:00Z on 2011-05-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 2011-05-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 233 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
1775 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
233 m²/s²
0-3 km storm-relative helicity
287 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.

IssuedProductOfficeCountiesLasted
May 22, 4:41 AM CDTMesoscale DiscussionSPCAdams, Boone, Brown, Bureau, Carroll, Cass and 37 more2 hr
May 22, 10:53 AM CDTMesoscale DiscussionSPCAdams, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more2 hr
May 22, 12:51 PM CDTTornado WatchSPCAdams, Bond, Brown, Bureau, Calhoun, Carroll and 42 more10 hr
May 22, 1:49 PM CDTMesoscale DiscussionSPCBoone, Cook, DeKalb, DuPage, Grundy, Kane and 10 more56 min
May 22, 2:04 PM CDTTornado WatchSPCBoone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more9 hr
May 22, 2:59 PM CDTMesoscale DiscussionSPCJo Daviess2 hr
May 22, 4:16 PM CDTMesoscale DiscussionSPCChampaign, Douglas, Edgar, Ford, Iroquois, Kankakee and 2 more119 min
May 21, 8:55 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Black Hawk, Boone and 68 more65 min
May 22, 12:07 PM CDTTornado WatchSPCAllamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more7 hr
May 22, 3:43 PM CDTTornado WatchSPCAshland, Bayfield, Burnett, Douglas, Iron, Price and 2 more5 hr

Nearby

Mesoscale Discussions in Wisconsin, 2011Mesoscale Discussions in Illinois, 2011Mesoscale Discussions in Iowa, 2011Every 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.