Alert archive / Michigan / Mesoscale Discussions in 2004

Mesoscale Discussion 1646

July 13, 200414 counties in Michigan; 13 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 13, 2004, 3:10 PM EDT for 14 counties in Michigan; 13 counties in Wisconsin. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 13, 2004, 3:10 PM EDT (19:10 UTC)
Expired: Jul 13, 2004, 5:15 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 27 counties

Antrim County, MI, Benzie County, MI, Charlevoix County, MI, Cheboygan County, MI, Chippewa County, MI, Delta County, MI, Dickinson County, MI, Emmet County, MI, Grand Traverse County, MI, Leelanau County, MI, Mackinac County, MI, Manistee County, MI, Menominee County, MI, Schoolcraft County, MI, Brown County, WI, Door County, WI, Kewaunee County, WI, Manitowoc County, WI, Marinette County, WI, Menominee County, WI, Oconto County, WI, Outagamie County, WI, Portage County, WI, Shawano County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI

The radar

The Green Bay radar (KGRB), 137 km from the middle of the area, began a volume at 19:13 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 622Jul 13, 4:05 PM EDT

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 7.2 hours before the alert went out and 138 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: 1324 J/kg
Mixed-layer CIN: -100 J/kg
Mixed-layer LCL: 841 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 100 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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 13, 11:08 AM EDT	Mesoscale Discussion	SPC	Alger, Alpena, Antrim, Benzie, Charlevoix, Cheboygan and 18 more	2 hr
Jul 13, 11:55 AM EDT	Severe Thunderstorm Watch	SPC	Antrim, Benzie, Charlevoix, Cheboygan, Chippewa, Delta and 8 more	6 hr
Jul 13, 4:05 PM EDT	Severe Thunderstorm Watch	SPC	Alcona, Alpena, Antrim, Arenac, Barry, Bay and 44 more	8 hr
Jul 13, 7:08 PM EDT	Mesoscale Discussion	SPC	Barry, Bay, Calhoun, Clare, Clinton, Eaton and 21 more	2 hr
Jul 13, 2:20 AM EDT	Severe Thunderstorm Watch	SPC	Ashland, Barron, Bayfield, Burnett, Douglas, Iron and 5 more	6 hr
Jul 13, 4:35 AM EDT	Mesoscale Discussion	SPC	Barron, Burnett, Polk, Saint Croix, Washburn	55 min
Jul 13, 2:19 PM EDT	Mesoscale Discussion	SPC	Adams, Calumet, Columbia, Crawford, Dane, Dodge and 21 more	116 min

Nearby

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