Alert archive / Illinois / Mesoscale Discussions in 2010

Mesoscale Discussion 1002

June 18, 201028 counties in Illinois; 6 counties in Iowa; 13 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jun 18, 2010, 2:33 AM CDT for 28 counties in Illinois; 6 counties in Iowa; 13 counties in Wisconsin. It was in force for 27 min.

The area

The outline as issued.

The facts

Issued
Jun 18, 2010, 2:33 AM CDT (07:33 UTC)
Expired
Jun 18, 2010, 3:00 AM CDT
In force
27 min
Issued by
the Storm Prediction Center
All 47 counties

Des Moines County, IA, Henry County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Washington County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Henderson County, IL, Henry County, IL, Kane County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Marshall 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, Will County, IL, Winnebago County, IL, Dodge County, WI, Fond du Lac County, WI, Green County, WI, Jefferson County, WI, Kenosha 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), 82 km from the middle of the area, began a volume at 07:33 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 00:00Z, 7.6 hours before the alert went out and 148 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 00:00Z on 2010-06-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1494 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 00:00Z on 2010-06-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 136 square meters per square second.193958Sfc1 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
1494 J/kg
Mixed-layer CIN
-132 J/kg
Mixed-layer LCL
1231 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
136 m²/s²
0-3 km storm-relative helicity
271 m²/s²
Significant tornado parameter
0.4
Supercell composite
5.5

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 17, 9:01 PM CDTSevere Thunderstorm WatchSPCRock Island6 hr
Jun 17, 9:43 PM CDTMesoscale DiscussionSPCStephenson62 min
Jun 17, 10:57 PM CDTMesoscale DiscussionSPCRock Island93 min
Jun 17, 11:00 PM CDTMesoscale DiscussionSPCJo Daviess, Stephenson, Winnebago60 min
Jun 17, 11:23 PM CDTSevere Thunderstorm WatchSPCBoone, Jo Daviess, Stephenson, Winnebago4 hr
Jun 18, 9:06 AM CDTSevere Thunderstorm WatchSPCBureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more7 hr
Jun 18, 10:41 AM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, DeKalb, DuPage, Fulton and 24 more2 hr
Jun 18, 12:14 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, DeKalb, DuPage, Fulton and 26 more61 min
Jun 18, 12:29 PM CDTSevere Thunderstorm WatchSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 33 more9 hr
Jun 18, 5:06 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Champaign, Cook, DeKalb and 32 more54 min
Jun 18, 5:30 PM CDTSevere Thunderstorm WatchSPCChampaign, Clark, Coles, Crawford, Cumberland, DeWitt and 9 more6 hr
Jun 18, 5:45 PM CDTMesoscale DiscussionSPCMercer, Rock Island60 min
Jun 18, 6:56 PM CDTMesoscale DiscussionSPCChampaign, Edgar, Vermilion94 min
Jun 17, 7:39 PM CDTMesoscale DiscussionSPCAllamakee, Audubon, Benton, Black Hawk, Boone, Bremer and 46 more96 min
Jun 17, 7:55 PM CDTMesoscale DiscussionSPCMills65 min
Jun 18, 7:47 AM CDTMesoscale DiscussionSPCAdair, Audubon, Boone, Calhoun, Carroll, Cass and 20 more88 min
Jun 18, 1:37 PM CDTMesoscale DiscussionSPCButler, Calhoun, Floyd, Franklin, Humboldt, Ida and 4 more113 min
Jun 18, 1:56 PM CDTMesoscale DiscussionSPCAdair, Adams, Cass, Clarke, Decatur, Fremont and 10 more94 min
Jun 18, 2:49 PM CDTTornado WatchSPCAdair, Adams, Appanoose, Audubon, Black Hawk, Boone and 39 more7 hr

Nearby

Mesoscale Discussions in Illinois, 2010Mesoscale Discussions in Wisconsin, 2010Mesoscale Discussions in Iowa, 2010Every mesoscale discussion in 2010

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.