Alert archive / Michigan / Mesoscale Discussions in 2018

Mesoscale Discussion 1385

August 28, 201840 counties in Michigan

The Storm Prediction Center issued this mesoscale discussion at Aug 28, 2018, 8:20 PM EDT for 40 counties in Michigan. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued: Aug 28, 2018, 8:20 PM EDT (00:20 UTC)
Expired: Aug 28, 2018, 9:15 PM EDT
In force: 55 min
Issued by: the Storm Prediction Center

All 40 counties

Alcona County, MI, Alpena County, MI, Antrim County, MI, Arenac County, MI, Barry County, MI, Bay County, MI, Clare County, MI, Clinton County, MI, Crawford County, MI, Eaton County, MI, Genesee County, MI, Gladwin County, MI, Gratiot County, MI, Huron County, MI, Ingham County, MI, Ionia County, MI, Iosco County, MI, Isabella County, MI, Kalkaska County, MI, Kent County, MI, Lapeer County, MI, Livingston County, MI, Macomb County, MI, Mecosta County, MI, Midland County, MI, Missaukee County, MI, Montcalm County, MI, Montmorency County, MI, Newaygo County, MI, Oakland County, MI, Ogemaw County, MI, Osceola County, MI, Oscoda County, MI, Otsego County, MI, Roscommon County, MI, Saginaw County, MI, Saint Clair County, MI, Sanilac County, MI, Shiawassee County, MI, Tuscola County, MI

The radar

The NCL Michigan radar (KAPX), 126 km from the middle of the area, began a volume at 00:23 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

Detroit, MI (KDTX), launched 00:00Z, 0.3 hours before the alert went out and 145 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: 2227 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 1131 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 41 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 6.3

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 28, 10:54 PM EDT	Mesoscale Discussion	SPC	Allegan, Berrien, Cass, Kalamazoo, Saint Joseph, Van Buren	66 min

Nearby

Mesoscale Discussions in Michigan, 2018 Every mesoscale discussion in 2018

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.