Alert archive / Wisconsin / Mesoscale Discussions in 2003

Mesoscale Discussion 1647

July 6, 20036 counties in Illinois; 12 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 6, 2003, 7:45 AM CDT for 6 counties in Illinois; 12 counties in Wisconsin. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 6, 2003, 7:45 AM CDT (12:45 UTC)
Expired: Jul 6, 2003, 9:45 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Boone County, IL, DeKalb County, IL, DuPage County, IL, Kane County, IL, Lake County, IL, McHenry County, IL, Dodge County, WI, Fond du Lac County, WI, Jefferson County, WI, Kenosha County, WI, Milwaukee County, WI, Ozaukee County, WI, Racine County, WI, Rock County, WI, Sheboygan County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI

The radar

The Milwaukee radar (KMKX), 31 km from the middle of the area, began a volume at 12:47 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 653Jul 6, 11:45 AM CDT

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 0.8 hours before the alert went out and 180 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: 682 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 956 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 38 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
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, 9:48 AM CDT	Mesoscale Discussion	SPC	Adams, Boone, Brown, Bureau, Carroll, Cass and 34 more	117 min
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 6, 6:54 PM CDT	Mesoscale Discussion	SPC	Ashland, Barron, Bayfield, Burnett, Douglas, Polk and 1 more	4 hr

Nearby

Mesoscale Discussions in Wisconsin, 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.