Alert archive / Wisconsin / Mesoscale Discussions in 2004

Mesoscale Discussion 729

May 17, 20045 counties in Illinois; Dubuque County, Iowa; 18 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at May 17, 2004, 6:44 PM CDT for 5 counties in Illinois; Dubuque County, Iowa; 18 counties in Wisconsin. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued: May 17, 2004, 6:44 PM CDT (23:44 UTC)
Expired: May 17, 2004, 7:45 PM CDT
In force: 61 min
Issued by: the Storm Prediction Center

All 24 counties

Dubuque County, IA, Boone County, IL, Jo Daviess County, IL, McHenry County, IL, Stephenson County, IL, Winnebago County, IL, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Milwaukee County, WI, Racine County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI

The radar

The Milwaukee radar (KMKX), 84 km from the middle of the area, began a volume at 23:44 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 214May 17, 7:15 PM CDT

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 11.7 hours before the alert went out and 208 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: 17 J/kg
Mixed-layer CIN: -436 J/kg
Mixed-layer LCL: 599 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 108 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
May 17, 10:22 AM CDT	Mesoscale Discussion	SPC	Cook, Ford, Iroquois, Kankakee, Will	2 hr
May 17, 12:41 PM CDT	Mesoscale Discussion	SPC	Jo Daviess, Stephenson, Winnebago	3 hr
May 16, 8:21 PM CDT	Mesoscale Discussion	SPC	Emmet	114 min
May 16, 9:26 PM CDT	Mesoscale Discussion	SPC	Adams, Audubon, Buena Vista, Calhoun, Carroll, Cass and 28 more	3 hr
May 17, 1:42 PM CDT	Mesoscale Discussion	SPC	Buena Vista, Calhoun, Carroll, Cherokee, Crawford, Harrison and 4 more	2 hr
May 17, 3:52 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Benton, Cass, Clarke and 33 more	113 min
May 17, 4:45 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Appanoose, Audubon, Boone, Cass and 26 more	5 hr

Nearby

Mesoscale Discussions in Wisconsin, 2004 Mesoscale Discussions in Illinois, 2004 Mesoscale Discussions in Iowa, 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.