Alert archive / Michigan / Mesoscale Discussions in 2008

Mesoscale Discussion 1913

July 25, 200810 counties in Michigan

The Storm Prediction Center issued this mesoscale discussion at Jul 25, 2008, 6:16 PM EDT for 10 counties in Michigan. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Jul 25, 2008, 6:16 PM EDT (22:16 UTC)
Expired: Jul 25, 2008, 7:15 PM EDT
In force: 59 min
Issued by: the Storm Prediction Center

Counties Antrim County, MI, Charlevoix County, MI, Cheboygan County, MI, Chippewa County, MI, Emmet County, MI, Leelanau County, MI, Luce County, MI, Mackinac County, MI, Otsego County, MI, Schoolcraft County, MI

The radar

The NCL Michigan radar (KAPX), 105 km from the middle of the area, began a volume at 22:19 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 12:00Z, 10.3 hours before the alert went out and 244 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: 1146 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 115 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, 12:56 PM EDT	Mesoscale Discussion	SPC	Baraga, Dickinson, Gogebic, Houghton, Iron, Keweenaw and 2 more	2 hr
Jul 25, 2:19 PM EDT	Severe Thunderstorm Watch	SPC	Alger, Baraga, Delta, Dickinson, Gogebic, Houghton and 7 more	8 hr
Jul 25, 4:38 PM EDT	Mesoscale Discussion	SPC	Alger, Baraga, Delta, Dickinson, Gogebic, Houghton and 8 more	97 min

Nearby

Mesoscale Discussions in Michigan, 2008 Every mesoscale discussion in 2008

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.