Alert archive / Illinois / Mesoscale Discussions in 2012

Mesoscale Discussion 1888

September 5, 201227 counties in Illinois; 20 counties in Iowa; 5 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Sep 5, 2012, 3:43 AM CDT for 27 counties in Illinois; 20 counties in Iowa; 5 counties in Wisconsin. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued
Sep 5, 2012, 3:43 AM CDT (08:43 UTC)
Expired
Sep 5, 2012, 5:15 AM CDT
In force
92 min
Issued by
the Storm Prediction Center
All 52 counties

Benton County, IA, Cedar County, IA, Clinton County, IA, Des Moines County, IA, Dubuque County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Linn County, IA, Louisa County, IA, Mahaska County, IA, Muscatine County, IA, Poweshiek County, IA, Scott County, IA, Wapello County, IA, Washington County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, DeKalb 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, 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, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Winnebago County, IL, Woodford County, IL, Grant County, WI, Green County, WI, Lafayette County, WI, Rock County, WI, Walworth County, WI

The radar

The Quad Cities radar (KDVN), 25 km from the middle of the area, began a volume at 08:46 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, 8.7 hours before the alert went out and 23 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 2012-09-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1890 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 2012-09-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -23 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
1890 J/kg
Mixed-layer CIN
-49 J/kg
Mixed-layer LCL
1662 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
-23 m²/s²
0-3 km storm-relative helicity
44 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.9

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
Sep 4, 8:30 PM CDTMesoscale DiscussionSPCJo Daviess60 min
Sep 4, 8:51 PM CDTSevere Thunderstorm WatchSPCBoone, Carroll, Cook, DeKalb, DuPage, Grundy and 13 more5 hr
Sep 5, 1:14 AM CDTMesoscale DiscussionSPCCarroll, Henry, Jo Daviess, Rock Island, Stephenson, Whiteside and 1 more91 min
Sep 5, 9:04 AM CDTMesoscale DiscussionSPCAlexander, Bond, Clark, Clay, Clinton, Crawford and 28 more86 min
Sep 5, 9:37 AM CDTSevere Thunderstorm WatchSPCBond, Clark, Clay, Clinton, Coles, Crawford and 24 more6 hr
Sep 5, 1:10 PM CDTMesoscale DiscussionSPCGallatin, Hardin, Johnson, Massac, Pope65 min
Sep 5, 1:43 PM CDTSevere Thunderstorm WatchSPCHardin5 hr
Sep 5, 2:13 PM CDTMesoscale DiscussionSPCAlexander, Massac, Pulaski2 hr
Sep 5, 2:29 PM CDTSevere Thunderstorm WatchSPCAlexander, Johnson, Massac, Pope, Pulaski, Union8 hr
Sep 5, 4:02 PM CDTMesoscale DiscussionSPCBoone, Carroll, Cook, DeKalb, DuPage, Jo Daviess and 7 more88 min
Sep 4, 7:27 PM CDTMesoscale DiscussionSPCBuena Vista, Cherokee, Clay, Dickinson, Lyon, O'Brien and 3 more63 min
Sep 4, 7:45 PM CDTSevere Thunderstorm WatchSPCBuena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more6 hr
Sep 4, 9:51 PM CDTMesoscale DiscussionSPCBuena Vista, Calhoun, Cerro Gordo, Clay, Dickinson, Emmet and 12 more54 min
Sep 4, 10:19 PM CDTSevere Thunderstorm WatchSPCBlack Hawk, Bremer, Butler, Calhoun, Cerro Gordo, Emmet and 14 more5 hr
Sep 4, 11:16 PM CDTSevere Thunderstorm WatchSPCAllamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more4 hr

Nearby

Mesoscale Discussions in Illinois, 2012Mesoscale Discussions in Iowa, 2012Mesoscale Discussions in Wisconsin, 2012Every mesoscale discussion in 2012

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.