Alert archive / Indiana / Mesoscale Discussions in 2003

Mesoscale Discussion 2266

August 26, 200317 counties in Illinois; 25 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at Aug 26, 2003, 11:15 AM CDT for 17 counties in Illinois; 25 counties in Indiana. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Aug 26, 2003, 11:15 AM CDT (16:15 UTC)
Expired: Aug 26, 2003, 2:15 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center

All 42 counties

Bureau County, IL, Champaign County, IL, Ford County, IL, Grundy County, IL, Henry County, IL, Iroquois County, IL, Kankakee County, IL, Kendall County, IL, LaSalle County, IL, Livingston County, IL, Marshall County, IL, McLean County, IL, Putnam County, IL, Stark County, IL, Vermilion County, IL, Will County, IL, Woodford County, IL, Benton County, IN, Blackford County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, Delaware County, IN, Fountain County, IN, Fulton County, IN, Grant County, IN, Hamilton County, IN, Howard County, IN, Huntington County, IN, Jasper County, IN, Madison County, IN, Miami County, IN, Montgomery County, IN, Newton County, IN, Pulaski County, IN, Tippecanoe County, IN, Tipton County, IN, Wabash County, IN, Warren County, IN, Wells County, IN, White County, IN

The radar

The Chicago radar (KLOT), 85 km from the middle of the area, began a volume at 16:14 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.

Severe Thunderstorm Watch 893Aug 26, 1:15 PM CDT

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 4.3 hours before the alert went out and 110 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: 787 J/kg
Mixed-layer CIN: -332 J/kg
Mixed-layer LCL: 1847 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 103 m²/s²
0-3 km storm-relative helicity: 100 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 25, 7:03 PM CDT	Mesoscale Discussion	SPC	Mercer, Rock Island	87 min
Aug 25, 8:45 PM CDT	Severe Thunderstorm Watch	SPC	Henderson, Mercer, Rock Island, Warren	5 hr
Aug 26, 12:21 AM CDT	Mesoscale Discussion	SPC	Boone, Jo Daviess, Lake, McHenry, Stephenson, Winnebago	84 min
Aug 26, 2:19 PM CDT	Mesoscale Discussion	SPC	Hancock, Henderson, McDonough	116 min
Aug 26, 4:45 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Cass, DeWitt, Fulton, Hancock and 14 more	90 min
Aug 26, 1:15 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Allen, Cass, DeKalb, Elkhart, Fulton and 19 more	4 hr
Aug 26, 2:46 PM CDT	Mesoscale Discussion	SPC	Adams, Allen, Blackford, Jay, Wells	119 min

Nearby

Mesoscale Discussions in Indiana, 2003 Mesoscale Discussions in Illinois, 2003 Every mesoscale discussion in 2003

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.