Alert archive / Michigan / Mesoscale Discussions in 2011

Mesoscale Discussion 1039

May 31, 201141 counties in Michigan; 28 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at May 31, 2011, 1:00 PM EDT for 41 counties in Michigan; 28 counties in Wisconsin. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: May 31, 2011, 1:00 PM EDT (17:00 UTC)
Expired: May 31, 2011, 3:30 PM EDT
In force: 3 hr
Issued by: the Storm Prediction Center

All 69 counties

Alger County, MI, Alpena County, MI, Antrim County, MI, Baraga County, MI, Benzie County, MI, Charlevoix County, MI, Cheboygan County, MI, Chippewa County, MI, Clare County, MI, Crawford County, MI, Delta County, MI, Dickinson County, MI, Emmet County, MI, Gladwin County, MI, Gogebic County, MI, Grand Traverse County, MI, Houghton County, MI, Iron County, MI, Kalkaska County, MI, Lake County, MI, Leelanau County, MI, Luce County, MI, Mackinac County, MI, Manistee County, MI, Marquette County, MI, Mason County, MI, Mecosta County, MI, Menominee County, MI, Missaukee County, MI, Montmorency County, MI, Newaygo County, MI, Oceana County, MI, Ogemaw County, MI, Ontonagon County, MI, Osceola County, MI, Oscoda County, MI, Otsego County, MI, Presque Isle County, MI, Roscommon County, MI, Schoolcraft County, MI, Wexford County, MI, Adams County, WI, Brown County, WI, Calumet County, WI, Door County, WI, Florence County, WI, Fond du Lac County, WI, Forest County, WI, Green Lake County, WI, Iron County, WI, Kewaunee County, WI, Langlade County, WI, Lincoln County, WI, Manitowoc County, WI, Marathon County, WI, Marinette County, WI, Marquette County, WI, Menominee County, WI, Oconto County, WI, Oneida County, WI, Outagamie County, WI, Portage County, WI, Shawano County, WI, Sheboygan County, WI, Vilas County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI

The radar

The Green Bay radar (KGRB), 94 km from the middle of the area, began a volume at 17:04 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, 5.0 hours before the alert went out and 95 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: 1066 J/kg
Mixed-layer CIN: -256 J/kg
Mixed-layer LCL: 958 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 88 m²/s²
0-3 km storm-relative helicity: 197 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
May 31, 1:56 PM EDT	Severe Thunderstorm Watch	SPC	Alcona, Alger, Alpena, Antrim, Arenac, Baraga and 30 more	8 hr
May 31, 1:59 PM EDT	Mesoscale Discussion	SPC	Allegan, Barry, Berrien, Branch, Calhoun, Cass and 10 more	3 hr
May 31, 3:33 PM EDT	Severe Thunderstorm Watch	SPC	Allegan, Barry, Bay, Berrien, Branch, Calhoun and 39 more	7 hr
May 31, 7:26 PM EDT	Mesoscale Discussion	SPC	Alcona, Allegan, Alpena, Antrim, Arenac, Barry and 62 more	2 hr

Nearby

Mesoscale Discussions in Michigan, 2011 Mesoscale Discussions in Wisconsin, 2011 Every mesoscale discussion in 2011

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.