Alert archive / Illinois / Mesoscale Discussions in 2010

Mesoscale Discussion 261

April 5, 20105 states

The Storm Prediction Center issued this mesoscale discussion at Apr 5, 2010, 9:37 PM CDT for 5 states. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued
Apr 5, 2010, 9:37 PM CDT (02:37 UTC)
Expired
Apr 5, 2010, 10:30 PM CDT
In force
53 min
Issued by
the Storm Prediction Center
All 30 counties

Benton County, IA, Buchanan County, IA, Clayton County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Jackson County, IA, Jones County, IA, Linn County, IA, Boone County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Jo Daviess County, IL, Kane County, IL, Lake County, IL, McHenry County, IL, Ogle County, IL, Stephenson County, IL, Winnebago County, IL, Saint Joseph County, IN, Berrien County, MI, Cass County, MI, Van Buren County, MI, Green County, WI, Kenosha County, WI, Lafayette County, WI, Rock County, WI, Walworth County, WI

The radar

The Milwaukee radar (KMKX), 92 km from the middle of the area, began a volume at 02:36 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 00:00Z, 2.6 hours before the alert went out and 133 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 2010-04-06Temperature 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 00:00Z on 2010-04-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 323 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
1762 m above ground
0-6 km bulk shear
76 kt
0-1 km storm-relative helicity
323 m²/s²
0-3 km storm-relative helicity
584 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.

IssuedProductOfficeCountiesLasted
Apr 5, 11:07 PM CDTSevere Thunderstorm WatchSPCBoone, Carroll, Cook, DeKalb, DuPage, Jo Daviess and 11 more5 hr
Apr 6, 4:05 AM CDTMesoscale DiscussionSPCJo Daviess85 min
Apr 6, 4:44 AM CDTSevere Thunderstorm WatchSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 16 more4 hr
Apr 6, 7:37 AM CDTMesoscale DiscussionSPCCook, DeKalb, DuPage, Kane, Lake, McHenry83 min
Apr 6, 2:57 PM CDTTornado WatchSPCCarroll, Jo Daviess, Stephenson7 hr
Apr 6, 4:55 PM CDTMesoscale DiscussionSPCBoone, Jo Daviess, Stephenson, Winnebago65 min
Apr 5, 8:04 PM CDTMesoscale DiscussionSPCDearborn, Franklin, Ohio, Switzerland, Union56 min
Apr 6, 8:26 AM CDTSevere Thunderstorm WatchSPCElkhart, LaGrange, LaPorte, Saint Joseph, Steuben4 hr
Apr 6, 10:27 AM CDTMesoscale DiscussionSPCElkhart, LaGrange, Saint Joseph, Steuben63 min
Apr 5, 7:24 PM CDTMesoscale DiscussionSPCDecatur, Fremont, Page, Ringgold, Taylor66 min
Apr 5, 7:39 PM CDTTornado WatchSPCAdams, Appanoose, Clarke, Davis, Decatur, Lucas and 6 more3 hr
Apr 5, 9:54 PM CDTMesoscale DiscussionSPCAppanoose, Clarke, Decatur, Page, Ringgold, Taylor and 2 more66 min
Apr 5, 10:39 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Appanoose, Audubon, Boone, Carroll and 30 more6 hr
Apr 6, 1:20 AM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Boone, Calhoun, Carroll and 34 more85 min
Apr 6, 1:32 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Clarke, Dallas, Decatur and 14 more58 min
Apr 6, 5:06 PM CDTSevere Thunderstorm WatchSPCAllamakee, Clayton, Fayette, Winneshiek6 hr
Apr 6, 6:16 PM CDTMesoscale DiscussionSPCAppanoose, Benton, Cedar, Clarke, Davis, Decatur and 20 more59 min
Apr 6, 3:42 AM CDTMesoscale DiscussionSPCIngham, Jackson, Livingston, Macomb, Oakland, Washtenaw and 1 more63 min

Nearby

Mesoscale Discussions in Illinois, 2010Mesoscale Discussions in Iowa, 2010Mesoscale Discussions in Wisconsin, 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.