Alert archive / Michigan / Mesoscale Discussions in 2009

Mesoscale Discussion 152

February 26, 200927 counties in Michigan; 7 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Feb 26, 2009, 7:31 PM EST for 27 counties in Michigan; 7 counties in Wisconsin. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Feb 26, 2009, 7:31 PM EST (00:31 UTC)
Expired: Feb 27, 2009, 12:30 AM EST
In force: 5 hr
Issued by: the Storm Prediction Center

All 34 counties

Alcona County, MI, 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, Manistee County, MI, Menominee County, MI, Missaukee County, MI, Montmorency County, MI, Oscoda County, MI, Otsego County, MI, Presque Isle County, MI, Roscommon County, MI, Schoolcraft County, MI, Wexford County, MI, Brown County, WI, Door County, WI, Florence County, WI, Kewaunee County, WI, Manitowoc County, WI, Marinette County, WI, Oconto County, WI

The radar

The NCL Michigan radar (KAPX), 99 km from the middle of the area, began a volume at 00:31 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 nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 0.5 hours before the alert went out and 211 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: 481 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 826 m²/s²
0-3 km storm-relative helicity: 1456 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
Feb 27, 1:10 AM EST	Mesoscale Discussion	SPC	Dodge, Fond du Lac, Jefferson, Milwaukee, Ozaukee, Sheboygan and 2 more	2 hr

Nearby

Mesoscale Discussions in Michigan, 2009 Mesoscale Discussions in Wisconsin, 2009 Every mesoscale discussion in 2009

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.