Alert archive / Wisconsin / Mesoscale Discussions in 2015

Mesoscale Discussion 1587

August 2, 201519 counties in Michigan; 37 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Aug 2, 2015, 3:00 PM EDT for 19 counties in Michigan; 37 counties in Wisconsin. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Aug 2, 2015, 3:00 PM EDT (19:00 UTC)
Expired
Aug 2, 2015, 5:00 PM EDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 56 counties

Allegan County, MI, Barry County, MI, Calhoun County, MI, Clinton County, MI, Eaton County, MI, Gratiot County, MI, Ingham County, MI, Ionia County, MI, Jackson County, MI, Kalamazoo County, MI, Kent County, MI, Mason County, MI, Mecosta County, MI, Montcalm County, MI, Muskegon County, MI, Newaygo County, MI, Oceana County, MI, Ottawa County, MI, Van Buren County, MI, Adams County, WI, Brown County, WI, Calumet County, WI, Columbia County, WI, Dane County, WI, Dodge County, WI, Fond du Lac County, WI, Grant County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Jackson County, WI, Jefferson County, WI, Juneau County, WI, Kenosha County, WI, La Crosse County, WI, Manitowoc County, WI, Marathon County, WI, Marquette County, WI, Milwaukee County, WI, Monroe County, WI, Outagamie County, WI, Ozaukee County, WI, Portage County, WI, Racine County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Sheboygan County, WI, Vernon County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI

The radar

The Milwaukee radar (KMKX), 71 km from the middle of the area, began a volume at 19:02 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 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, 7.0 hours before the alert went out and 119 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 2015-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1667 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 2015-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 166 square meters per square second.19395878Sfc1 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
1667 J/kg
Mixed-layer CIN
-90 J/kg
Mixed-layer LCL
1134 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
166 m²/s²
0-3 km storm-relative helicity
291 m²/s²
Significant tornado parameter
1.2
Supercell composite
10.4

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
Aug 2, 5:21 AM EDTMesoscale DiscussionSPCGogebic, Iron, Ontonagon2 hr
Aug 2, 8:51 AM EDTMesoscale DiscussionSPCAntrim, Benzie, Charlevoix, Crawford, Delta, Dickinson and 13 more2 hr
Aug 2, 9:51 AM EDTSevere Thunderstorm WatchSPCAlcona, Alpena, Antrim, Arenac, Benzie, Charlevoix and 19 more7 hr
Aug 2, 12:49 PM EDTMesoscale DiscussionSPCCrawford, Iosco, Missaukee, Montmorency, Ogemaw, Oscoda and 2 more56 min
Aug 2, 1:09 PM EDTMesoscale DiscussionSPCDelta, Dickinson, Iron, Menominee2 hr
Aug 2, 2:56 PM EDTMesoscale DiscussionSPCClinton, Genesee, Ingham, Lapeer, Livingston, Macomb and 6 more64 min
Aug 2, 3:59 PM EDTSevere Thunderstorm WatchSPCAlcona, Allegan, Alpena, Antrim, Arenac, Barry and 35 more7 hr
Aug 2, 6:08 PM EDTMesoscale DiscussionSPCBay, Clinton, Genesee, Gladwin, Gratiot, Ingham and 15 more97 min
Aug 2, 6:27 PM EDTSevere Thunderstorm WatchSPCAllegan, Barry, Bay, Calhoun, Clare, Clinton and 34 more6 hr
Aug 2, 1:55 AM EDTMesoscale DiscussionSPCAdams, Chippewa, Clark, Eau Claire, Green Lake, Jackson and 16 more3 hr

Nearby

Mesoscale Discussions in Wisconsin, 2015Mesoscale Discussions in Michigan, 2015Every mesoscale discussion in 2015

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.