Alert archive / Illinois / Mesoscale Discussions in 2003

Mesoscale Discussion 1648

July 6, 20034 states

The Storm Prediction Center issued this mesoscale discussion at Jul 6, 2003, 9:48 AM CDT for 4 states. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: Jul 6, 2003, 9:48 AM CDT (14:48 UTC)
Expired: Jul 6, 2003, 11:45 AM CDT
In force: 117 min
Issued by: the Storm Prediction Center

All 58 counties

Clinton County, IA, Des Moines County, IA, Jackson County, IA, Lee County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Adams County, IL, Boone County, IL, Brown County, IL, Bureau County, IL, Carroll County, IL, Cass County, IL, DeKalb County, IL, DuPage County, IL, Fulton County, IL, Grundy County, IL, Hancock 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, Livingston County, IL, Logan County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McHenry County, IL, McLean County, IL, Menard County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Schuyler County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Winnebago County, IL, Woodford County, IL, Clark County, MO, Knox County, MO, Lewis County, MO, Marion County, MO, Dane County, WI, Green County, WI, Iowa County, WI, Jefferson County, WI, Lafayette County, WI, Rock County, WI, Walworth County, WI

The radar

The Quad Cities radar (KDVN), 36 km from the middle of the area, began a volume at 14:51 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 12:00Z, 2.8 hours before the alert went out and 30 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: 8 J/kg
Mixed-layer CIN: -455 J/kg
Mixed-layer LCL: 1483 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 120 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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 5, 7:20 PM CDT	Mesoscale Discussion	SPC	Edgar, Iroquois, Vermilion	55 min
Jul 5, 7:51 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Cass, Champaign, Christian, Clark and 40 more	54 min
Jul 5, 10:46 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Cass, Champaign, Christian, Clark and 33 more	59 min
Jul 6, 5:17 AM CDT	Mesoscale Discussion	SPC	Carroll, Jo Daviess, Stephenson, Whiteside	118 min
Jul 6, 7:45 AM CDT	Mesoscale Discussion	SPC	Boone, DeKalb, DuPage, Kane, Lake, McHenry	2 hr
Jul 6, 11:45 AM CDT	Tornado Watch	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 28 more	6 hr
Jul 6, 12:36 PM CDT	Mesoscale Discussion	SPC	Cook, Kankakee	114 min
Jul 6, 1:10 PM CDT	Severe Thunderstorm Watch	SPC	Champaign, Christian, Clark, Coles, Cumberland, DeWitt and 14 more	5 hr
Jul 6, 2:00 PM CDT	Mesoscale Discussion	SPC	Boone, Brown, Cass, Champaign, Christian, Coles and 35 more	2 hr
Jul 6, 5:28 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Champaign, Christian, Coles and 45 more	62 min
Jul 6, 6:00 PM CDT	Severe Thunderstorm Watch	SPC	Boone, Cook, DeKalb, DuPage, Ford, Grundy and 9 more	5 hr
Jul 5, 7:20 PM CDT	Tornado Watch	SPC	Fremont, Harrison, Mills, Monona, Page, Pottawattamie and 1 more	6 hr
Jul 5, 8:04 PM CDT	Mesoscale Discussion	SPC	Clay, Dickinson, Emmet, Lyon, O'Brien, Osceola and 2 more	86 min
Jul 5, 10:57 PM CDT	Mesoscale Discussion	SPC	Fremont, Harrison, Mills, Monona, Montgomery, Page and 1 more	63 min
Jul 5, 11:50 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Appanoose, Audubon, Boone, Carroll and 36 more	5 hr
Jul 6, 2:26 AM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Benton, Black Hawk, Boone and 49 more	94 min
Jul 6, 4:33 AM CDT	Mesoscale Discussion	SPC	Adair, Audubon, Carroll, Cass, Clarke, Crawford and 12 more	87 min
Jul 6, 6:54 PM CDT	Mesoscale Discussion	SPC	Ashland, Barron, Bayfield, Burnett, Douglas, Polk and 1 more	4 hr

Nearby

Mesoscale Discussions in Illinois, 2003 Mesoscale Discussions in Iowa, 2003 Mesoscale Discussions in Wisconsin, 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.