Alert archive / Michigan / Mesoscale Discussions in 2012

Mesoscale Discussion 1590

July 25, 201228 counties in Michigan; 14 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 25, 2012, 7:25 PM EDT for 28 counties in Michigan; 14 counties in Wisconsin. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Jul 25, 2012, 7:25 PM EDT (23:25 UTC)
Expired: Jul 25, 2012, 9:00 PM EDT
In force: 95 min
Issued by: the Storm Prediction Center
Chance of a watch: 95%

All 42 counties

Arenac County, MI, Bay County, MI, Benzie County, MI, Clare County, MI, Clinton County, MI, Genesee County, MI, Gladwin County, MI, Gratiot County, MI, Ionia County, MI, Isabella County, MI, Kent County, MI, Lake County, MI, Manistee County, MI, Mason County, MI, Mecosta County, MI, Midland County, MI, Missaukee County, MI, Montcalm County, MI, Muskegon County, MI, Newaygo County, MI, Oceana County, MI, Osceola County, MI, Ottawa County, MI, Roscommon County, MI, Saginaw County, MI, Shiawassee County, MI, Tuscola County, MI, Wexford County, MI, Brown County, WI, Calumet County, WI, Dodge County, WI, Fond du Lac County, WI, Green Lake County, WI, Kewaunee County, WI, Manitowoc County, WI, Outagamie County, WI, Ozaukee County, WI, Sheboygan County, WI, Washington County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI

The radar

The Grand Rapids radar (KGRR), 131 km from the middle of the area, began a volume at 23:29 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, 11.4 hours before the alert went out and 152 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1621 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 230 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
Jul 25, 6:24 AM EDT	Mesoscale Discussion	SPC	Gogebic	66 min
Jul 25, 3:57 PM EDT	Mesoscale Discussion	SPC	Manistee, Mason, Muskegon, Oceana	2 hr
Jul 25, 7:38 PM EDT	Severe Thunderstorm Watch	SPC	Alcona, Arenac, Benzie, Clare, Clinton, Crawford and 23 more	7 hr
Jul 25, 3:05 AM EDT	Mesoscale Discussion	SPC	Ashland, Bayfield, Burnett, Douglas, Iron, Price and 3 more	55 min
Jul 25, 3:24 AM EDT	Severe Thunderstorm Watch	SPC	Ashland, Barron, Bayfield, Burnett, Douglas, Iron and 5 more	5 hr
Jul 25, 6:16 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Buffalo, Crawford, Grant, Jackson, Juneau and 5 more	8 hr

Nearby

Mesoscale Discussions in Michigan, 2012 Mesoscale Discussions in Wisconsin, 2012 Every mesoscale discussion in 2012

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.