Alert archive / Illinois / Mesoscale Discussions in 2004

Mesoscale Discussion 1001

May 30, 200445 counties in Illinois; 15 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at May 30, 2004, 5:36 PM CDT for 45 counties in Illinois; 15 counties in Wisconsin. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: May 30, 2004, 5:36 PM CDT (22:36 UTC)
Expired: May 30, 2004, 6:30 PM CDT
In force: 54 min
Issued by: the Storm Prediction Center

All 60 counties

Boone County, IL, Bureau County, IL, Carroll County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, Cook County, IL, DeKalb County, IL, DeWitt County, IL, Douglas County, IL, DuPage County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Iroquois County, IL, Jo Daviess County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Marshall County, IL, Mason County, IL, McHenry County, IL, McLean County, IL, Menard County, IL, Morgan County, IL, Moultrie County, IL, Ogle County, IL, Peoria County, IL, Piatt County, IL, Putnam County, IL, Sangamon County, IL, Scott County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Woodford County, IL, Columbia County, WI, Dane County, WI, Dodge 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, Sauk County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI

The radar

The Quad Cities radar (KDVN), 84 km from the middle of the area, began a volume at 22:39 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.

Tornado Watch 342May 30, 6:40 PM CDT

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.6 hours before the alert went out and 159 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: 1629 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 569 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 201 m²/s²
0-3 km storm-relative helicity: 177 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 8.9

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.

Issued	Product	Office	Counties	Lasted
May 30, 7:40 AM CDT	Tornado Watch	SPC	Adams, Brown, Cass, Champaign, Christian, Coles and 31 more	5 hr
May 30, 9:40 AM CDT	Mesoscale Discussion	SPC	Adams, Brown, Calhoun, Cass, Greene, Hancock and 6 more	3 hr
May 30, 10:04 AM CDT	Mesoscale Discussion	SPC	Alexander, Clay, Clinton, Edwards, Franklin, Gallatin and 19 more	2 hr
May 30, 10:50 AM CDT	Tornado Watch	SPC	Adams, Brown, Hancock, McDonough, Pike	8 hr
May 30, 11:04 AM CDT	Mesoscale Discussion	SPC	Champaign, Cook, DeWitt, Douglas, DuPage, Iroquois and 4 more	116 min
May 30, 11:50 AM CDT	Tornado Watch	SPC	Clark, Crawford, Edgar, Edwards, Gallatin, Hardin and 7 more	7 hr
May 30, 12:13 PM CDT	Mesoscale Discussion	SPC	Carroll, Hancock, Henderson, Henry, Jo Daviess, Knox and 4 more	2 hr
May 30, 12:25 PM CDT	Tornado Watch	SPC	Bureau, Carroll, Henderson, Henry, Jo Daviess, Knox and 8 more	7 hr
May 30, 12:53 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Calhoun, Cass, Christian, Fulton and 13 more	2 hr
May 30, 1:05 PM CDT	Tornado Watch	SPC	Alexander, Bond, Calhoun, Cass, Champaign, Christian and 45 more	6 hr
May 30, 3:16 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Cass, DeKalb, DuPage and 29 more	119 min
May 30, 4:25 PM CDT	Tornado Watch	SPC	Boone, Cook, DeKalb, DuPage, Grundy, Iroquois and 12 more	6 hr
May 30, 5:10 PM CDT	Mesoscale Discussion	SPC	Alexander, Bond, Clinton, Fayette, Jackson, Madison and 7 more	95 min
May 30, 6:40 PM CDT	Tornado Watch	SPC	Alexander, Bond, Champaign, Christian, Clark, Clay and 41 more	6 hr
May 30, 6:55 PM CDT	Tornado Watch	SPC	Gallatin, Hardin, Lawrence, Wabash	8 hr
May 30, 2:45 PM CDT	Mesoscale Discussion	SPC	Buffalo, Dunn, La Crosse, Pepin, Pierce, Saint Croix and 2 more	2 hr

Nearby

Mesoscale Discussions in Illinois, 2004 Mesoscale Discussions in Wisconsin, 2004 Every mesoscale discussion in 2004

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.