Alert archive / Illinois / Mesoscale Discussions in 2005

Mesoscale Discussion 1966

August 11, 20055 states

The Storm Prediction Center issued this mesoscale discussion at Aug 11, 2005, 10:42 PM CDT for 5 states. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Aug 11, 2005, 10:42 PM CDT (03:42 UTC)
Expired: Aug 12, 2005, 12:15 AM CDT
In force: 93 min
Issued by: the Storm Prediction Center

All 67 counties

Cedar County, IA, Clinton County, IA, Des Moines County, IA, Dubuque County, IA, Jackson County, IA, Jones County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Grundy County, IL, Henderson County, IL, Henry County, IL, Iroquois County, IL, Jo Daviess County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, McHenry County, IL, McLean 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, Will County, IL, Winnebago County, IL, Woodford County, IL, Jasper County, IN, Lake County, IN, LaPorte County, IN, Newton County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Allegan County, MI, Berrien County, MI, Van Buren County, MI, Dane County, WI, Green County, WI, Iowa County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Milwaukee County, WI, Racine County, WI, Rock County, WI, Walworth County, WI, Waukesha County, WI

The radar

The Chicago radar (KLOT), 87 km from the middle of the area, began a volume at 03:44 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, 3.7 hours before the alert went out and 115 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 850 J/kg
Mixed-layer CIN: -70 J/kg
Mixed-layer LCL: 1155 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 190 m²/s²
0-3 km storm-relative helicity: 206 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 6.7

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.

Issued	Product	Office	Counties	Lasted
Aug 11, 7:42 PM CDT	Mesoscale Discussion	SPC	Mercer, Rock Island	93 min
Aug 12, 1:07 PM CDT	Mesoscale Discussion	SPC	Grundy, Iroquois, Kankakee, Kendall, LaSalle, Livingston and 7 more	113 min

Nearby

Mesoscale Discussions in Illinois, 2005 Mesoscale Discussions in Wisconsin, 2005 Mesoscale Discussions in Iowa, 2005 Every mesoscale discussion in 2005

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.