Alert archive / Wisconsin / Mesoscale Discussions in 2004

Mesoscale Discussion 2548

December 20, 20048 counties in Michigan; 4 counties in Minnesota; 11 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Dec 20, 2004, 2:02 AM EST for 8 counties in Michigan; 4 counties in Minnesota; 11 counties in Wisconsin. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Dec 20, 2004, 2:02 AM EST (07:02 UTC)
Expired: Dec 20, 2004, 6:30 AM EST
In force: 4 hr
Issued by: the Storm Prediction Center

All 23 counties

Baraga County, MI, Dickinson County, MI, Gogebic County, MI, Houghton County, MI, Iron County, MI, Keweenaw County, MI, Marquette County, MI, Ontonagon County, MI, Carlton County, MN, Cook County, MN, Lake County, MN, Saint Louis County, MN, Ashland County, WI, Bayfield County, WI, Douglas County, WI, Florence County, WI, Forest County, WI, Iron County, WI, Oneida County, WI, Price County, WI, Sawyer County, WI, Vilas County, WI, Washburn County, WI

The radar

The Duluth radar (KDLH), 118 km from the middle of the area, began a volume at 07:01 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

Minneapolis, MN (KMPX), launched 00:00Z, 7.0 hours before the alert went out and 328 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1873 m above ground
0-6 km bulk shear: 82 kt
0-1 km storm-relative helicity: 258 m²/s²
0-3 km storm-relative helicity: 711 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
Dec 19, 7:52 PM EST	Mesoscale Discussion	SPC	Becker, Beltrami, Cass, Clay, Clearwater, Crow Wing and 17 more	6 hr
Dec 20, 6:28 AM EST	Mesoscale Discussion	SPC	Anoka, Blue Earth, Brown, Carver, Cottonwood, Dakota and 28 more	5 hr

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.