Alert archive / Illinois / Mesoscale Discussions in 2005

Mesoscale Discussion 1865

July 25, 200518 counties in Illinois; 13 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at Jul 25, 2005, 3:50 PM CDT for 18 counties in Illinois; 13 counties in Indiana. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued: Jul 25, 2005, 3:50 PM CDT (20:50 UTC)
Expired: Jul 25, 2005, 4:45 PM CDT
In force: 55 min
Issued by: the Storm Prediction Center

All 31 counties

Boone County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Grundy County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, McHenry County, IL, Ogle County, IL, Will County, IL, Winnebago County, IL, Benton County, IN, Carroll County, IN, Cass County, IN, Grant County, IN, Huntington County, IN, Jasper County, IN, Lake County, IN, Miami County, IN, Newton County, IN, Porter County, IN, Wabash County, IN, Wells County, IN, White County, IN

The radar

The Chicago radar (KLOT), 64 km from the middle of the area, began a volume at 20:50 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

Lincoln, IL (KILX), launched 12:00Z, 8.8 hours before the alert went out and 158 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: 1270 J/kg
Mixed-layer CIN: -188 J/kg
Mixed-layer LCL: 1643 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: 62 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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
Jul 24, 8:20 PM CDT	Severe Thunderstorm Watch	SPC	Jo Daviess, Stephenson	5 hr
Jul 24, 11:11 PM CDT	Mesoscale Discussion	SPC	Jo Daviess	64 min
Jul 25, 8:53 AM CDT	Mesoscale Discussion	SPC	Cook, DeKalb, DuPage, Grundy, Iroquois, Kane and 7 more	97 min
Jul 25, 10:05 AM CDT	Severe Thunderstorm Watch	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 28 more	7 hr
Jul 25, 1:31 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 27 more	89 min
Jul 25, 9:25 AM CDT	Severe Thunderstorm Watch	SPC	Adams, Allen, Carroll, Cass, DeKalb, Elkhart and 17 more	8 hr
Jul 25, 11:57 AM CDT	Mesoscale Discussion	SPC	Adams, Allen, Cass, DeKalb, Elkhart, Fulton and 12 more	93 min
Jul 25, 1:53 PM CDT	Mesoscale Discussion	SPC	Adams, Cass, Huntington, Miami, Pulaski, Wabash and 1 more	67 min

Nearby

Mesoscale Discussions in Illinois, 2005 Mesoscale Discussions in Indiana, 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.