Alert archive / Illinois / Mesoscale Discussions in 2008

Mesoscale Discussion 1345

June 12, 200832 counties in Illinois; 11 counties in Iowa; 18 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jun 12, 2008, 6:49 PM CDT for 32 counties in Illinois; 11 counties in Iowa; 18 counties in Wisconsin. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued
Jun 12, 2008, 6:49 PM CDT (23:49 UTC)
Expired
Jun 12, 2008, 8:15 PM CDT
In force
86 min
Issued by
the Storm Prediction Center
All 61 counties

Cedar County, IA, Clinton County, IA, Des Moines County, IA, Dubuque County, IA, Henry County, IA, Jackson County, IA, Jones County, IA, Lee County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Adams County, IL, Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Fulton County, IL, Grundy County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Kane County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee 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, Calumet County, WI, Columbia County, WI, Dane County, WI, Dodge County, WI, Fond du Lac County, WI, Green County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Manitowoc County, WI, Milwaukee County, WI, Ozaukee County, WI, Racine County, WI, Rock County, WI, Sheboygan County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI

The radar

The Milwaukee radar (KMKX), 50 km from the middle of the area, began a volume at 23:52 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.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.8 hours before the alert went out and 174 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 2008-06-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 698 joules per kilogram.LCLLFCEL10008507005003002001001 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 2008-06-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 285 square meters per square second.19395878Sfc1 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
698 J/kg
Mixed-layer CIN
-96 J/kg
Mixed-layer LCL
983 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
285 m²/s²
0-3 km storm-relative helicity
272 m²/s²
Significant tornado parameter
0.7
Supercell composite
7.8

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
Jun 12, 12:37 PM CDTMesoscale DiscussionSPCAdams, Boone, Brown, Bureau, Carroll, DeKalb and 29 more113 min
Jun 12, 1:04 PM CDTTornado WatchSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 32 more7 hr
Jun 12, 3:06 PM CDTTornado WatchSPCAdams, Brown7 hr
Jun 12, 3:45 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, DeKalb, DuPage, Fulton and 22 more90 min
Jun 12, 3:52 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, DeKalb, Henderson, Henry and 12 more113 min
Jun 11, 8:05 PM CDTMesoscale DiscussionSPCBoone, Bremer, Butler, Cerro Gordo, Chickasaw, Clarke and 24 more115 min
Jun 11, 8:39 PM CDTTornado WatchSPCAdair, Adams, Appanoose, Black Hawk, Boone, Bremer and 39 more5 hr
Jun 11, 8:57 PM CDTMesoscale DiscussionSPCAudubon, Carroll, Cass, Crawford, Fremont, Harrison and 6 more93 min
Jun 11, 9:46 PM CDTTornado WatchSPCFremont, Mills, Montgomery, Page5 hr
Jun 11, 9:58 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Black Hawk, Boone, Bremer and 36 more92 min
Jun 11, 11:41 PM CDTMesoscale DiscussionSPCAdair, Adams, Allamakee, Appanoose, Benton, Black Hawk and 43 more2 hr
Jun 12, 3:56 AM CDTMesoscale DiscussionSPCAppanoose, Lucas, Marion, Monroe, Wayne94 min
Jun 12, 4:51 PM CDTMesoscale DiscussionSPCAdams, Brown, Calumet, Juneau, Langlade, Lincoln and 13 more84 min

Nearby

Mesoscale Discussions in Illinois, 2008Mesoscale Discussions in Wisconsin, 2008Mesoscale Discussions in Iowa, 2008Every mesoscale discussion in 2008

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.