Alert archive / Michigan / Mesoscale Discussions in 2004

Mesoscale Discussion 1642

July 13, 200424 counties in Michigan; 11 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 13, 2004, 11:08 AM EDT for 24 counties in Michigan; 11 counties in Wisconsin. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jul 13, 2004, 11:08 AM EDT (15:08 UTC)
Expired
Jul 13, 2004, 1:15 PM EDT
In force
2 hr
Issued by
the Storm Prediction Center
All 35 counties

Alger County, MI, Alpena County, MI, Antrim County, MI, Benzie County, MI, Charlevoix County, MI, Cheboygan County, MI, Chippewa County, MI, Crawford County, MI, Delta County, MI, Dickinson County, MI, Emmet County, MI, Grand Traverse County, MI, Kalkaska County, MI, Leelanau County, MI, Luce County, MI, Mackinac County, MI, Menominee County, MI, Missaukee County, MI, Montmorency County, MI, Oscoda County, MI, Otsego County, MI, Roscommon County, MI, Schoolcraft County, MI, Wexford County, MI, Brown County, WI, Door County, WI, Florence County, WI, Forest County, WI, Kewaunee County, WI, Langlade County, WI, Marinette County, WI, Menominee County, WI, Oconto County, WI, Outagamie County, WI, Shawano County, WI

The radar

The NCL Michigan radar (KAPX), 100 km from the middle of the area, began a volume at 15:08 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.

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 3.1 hours before the alert went out and 191 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-pSkew-T log-p diagram, Green Bay/Straub, WI at 12:00Z on 2004-07-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1324 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Green Bay/Straub, WI at 12:00Z on 2004-07-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 46 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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.

IssuedProductOfficeCountiesLasted
Jul 13, 11:55 AM EDTSevere Thunderstorm WatchSPCAntrim, Benzie, Charlevoix, Cheboygan, Chippewa, Delta and 8 more6 hr
Jul 13, 3:10 PM EDTMesoscale DiscussionSPCAntrim, Benzie, Charlevoix, Cheboygan, Chippewa, Delta and 8 more2 hr
Jul 13, 4:05 PM EDTSevere Thunderstorm WatchSPCAlcona, Alpena, Antrim, Arenac, Barry, Bay and 44 more8 hr
Jul 13, 7:08 PM EDTMesoscale DiscussionSPCBarry, Bay, Calhoun, Clare, Clinton, Eaton and 21 more2 hr
Jul 13, 2:20 AM EDTSevere Thunderstorm WatchSPCAshland, Barron, Bayfield, Burnett, Douglas, Iron and 5 more6 hr
Jul 13, 4:35 AM EDTMesoscale DiscussionSPCBarron, Burnett, Polk, Saint Croix, Washburn55 min
Jul 13, 2:19 PM EDTMesoscale DiscussionSPCAdams, Calumet, Columbia, Crawford, Dane, Dodge and 21 more116 min

Nearby

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