Alert archive / Michigan / Mesoscale Discussions in 2009

Mesoscale Discussion 41

January 17, 200933 counties in Michigan; 9 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jan 17, 2009, 6:35 AM EST for 33 counties in Michigan; 9 counties in Wisconsin. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Jan 17, 2009, 6:35 AM EST (11:35 UTC)
Expired: Jan 17, 2009, 10:30 AM EST
In force: 4 hr
Issued by: the Storm Prediction Center

All 42 counties

Antrim County, MI, Baraga County, MI, Benzie County, MI, Charlevoix County, MI, Clare County, MI, Crawford County, MI, Delta County, MI, Dickinson County, MI, Emmet County, MI, Gladwin County, MI, Grand Traverse County, MI, Iron County, MI, Isabella County, MI, Kalkaska County, MI, Lake County, MI, Leelanau County, MI, Manistee County, MI, Marquette County, MI, Mason County, MI, Mecosta County, MI, Menominee County, MI, Missaukee County, MI, Montcalm County, MI, Muskegon County, MI, Newaygo County, MI, Oceana County, MI, Ogemaw County, MI, Osceola 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, Manitowoc County, WI, Marinette County, WI, Menominee County, WI, Oconto County, WI

The radar

The Green Bay radar (KGRB), 121 km from the middle of the area, began a volume at 11:32 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

Alpena, MI (KAPX), launched 00:00Z, 11.6 hours before the alert went out and 337 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: 889 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 261 m²/s²
0-3 km storm-relative helicity: 370 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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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.