Alert archive / Wisconsin / Mesoscale Discussions in 2004

Mesoscale Discussion 2217

September 15, 20044 counties in Michigan; Carlton County, Minnesota; 45 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Sep 15, 2004, 3:23 PM CDT for 4 counties in Michigan; Carlton County, Minnesota; 45 counties in Wisconsin. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Sep 15, 2004, 3:23 PM CDT (20:23 UTC)
Expired: Sep 15, 2004, 5:00 PM CDT
In force: 97 min
Issued by: the Storm Prediction Center

All 50 counties

Dickinson County, MI, Gogebic County, MI, Iron County, MI, Menominee County, MI, Carlton County, MN, Adams County, WI, Ashland County, WI, Barron County, WI, Brown County, WI, Buffalo County, WI, Burnett County, WI, Chippewa County, WI, Clark County, WI, Douglas County, WI, Dunn County, WI, Eau Claire County, WI, Florence County, WI, Forest County, WI, Iron County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Marinette County, WI, Marquette County, WI, Menominee County, WI, Monroe County, WI, Oconto County, WI, Oneida County, WI, Outagamie County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Portage County, WI, Price County, WI, Rusk County, WI, Saint Croix County, WI, Sawyer County, WI, Shawano County, WI, Taylor County, WI, Trempealeau County, WI, Vernon County, WI, Vilas County, WI, Washburn County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI

The radar

The La Crosse radar (KARX), 120 km from the middle of the area, began a volume at 20:24 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 nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 8.4 hours before the alert went out and 212 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: 424 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 727 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 115 m²/s²
0-3 km storm-relative helicity: 135 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.1

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
Sep 15, 12:25 PM CDT	Tornado Watch	SPC	Gogebic, Iron	8 hr
Sep 14, 7:17 PM CDT	Mesoscale Discussion	SPC	Freeborn	118 min
Sep 14, 8:16 PM CDT	Mesoscale Discussion	SPC	Fillmore, Houston, Mower, Olmsted, Winona	3 hr
Sep 15, 10:47 AM CDT	Mesoscale Discussion	SPC	Chisago, Dakota, Dodge, Fillmore, Goodhue, Houston and 6 more	88 min

Nearby

Mesoscale Discussions in Wisconsin, 2004 Mesoscale Discussions in Michigan, 2004 Mesoscale Discussions in Minnesota, 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.