Alert archive / Michigan / Mesoscale Discussions in 2004

Mesoscale Discussion 2381

October 30, 20044 states

The Storm Prediction Center issued this mesoscale discussion at Oct 30, 2004, 1:02 AM CDT for 4 states. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Oct 30, 2004, 1:02 AM CDT (06:02 UTC)
Expired: Oct 30, 2004, 2:30 AM CDT
In force: 88 min
Issued by: the Storm Prediction Center

All 68 counties

Boone County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, McHenry County, IL, Will County, IL, Elkhart County, IN, Fulton County, IN, Jasper County, IN, Kosciusko County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Allegan County, MI, Antrim County, MI, Barry County, MI, Benzie County, MI, Berrien County, MI, Cass County, MI, Charlevoix County, MI, Grand Traverse County, MI, Kalamazoo County, MI, Kent County, MI, Lake County, MI, Leelanau County, MI, Manistee County, MI, Mason County, MI, Mecosta County, MI, Menominee County, MI, Montcalm County, MI, Muskegon County, MI, Newaygo County, MI, Oceana County, MI, Osceola County, MI, Ottawa County, MI, Saint Joseph County, MI, Van Buren County, MI, Wexford County, MI, Brown County, WI, Calumet County, WI, Dodge County, WI, Door County, WI, Fond du Lac County, WI, Jefferson County, WI, Kenosha County, WI, Kewaunee County, WI, Manitowoc County, WI, Marinette County, WI, Milwaukee County, WI, Oconto County, WI, Outagamie County, WI, Ozaukee County, WI, Racine County, WI, Sheboygan County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI, Winnebago County, WI

The radar

The Milwaukee radar (KMKX), 108 km from the middle of the area, began a volume at 06:02 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 00:00Z, 6.0 hours before the alert went out and 145 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: 1106 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 634 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 150 m²/s²
0-3 km storm-relative helicity: 196 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 4.3

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
Oct 29, 9:02 PM CDT	Mesoscale Discussion	SPC	Bureau, Carroll, Fulton, Hancock, Henderson, Henry and 11 more	88 min
Oct 29, 10:45 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, DeKalb, DuPage, Grundy and 14 more	60 min
Oct 29, 10:55 PM CDT	Severe Thunderstorm Watch	SPC	Boone, Cook, DeKalb, DuPage, Grundy, Kane and 7 more	4 hr
Oct 29, 7:30 PM CDT	Mesoscale Discussion	SPC	Burnett, Pierce, Polk, Saint Croix	60 min

Nearby

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