Alert archive / Michigan / Mesoscale Discussions in 2007

Mesoscale Discussion 802

May 15, 200713 counties in Michigan

The Storm Prediction Center issued this mesoscale discussion at May 15, 2007, 4:02 AM EDT for 13 counties in Michigan. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: May 15, 2007, 4:02 AM EDT (08:02 UTC)
Expired: May 15, 2007, 5:30 AM EDT
In force: 88 min
Issued by: the Storm Prediction Center

Counties Arenac County, MI, Bay County, MI, Clare County, MI, Gladwin County, MI, Gratiot County, MI, Isabella County, MI, Kent County, MI, Mecosta County, MI, Midland County, MI, Montcalm County, MI, Newaygo County, MI, Osceola County, MI, Saginaw County, MI

The radar

The Grand Rapids radar (KGRR), 109 km from the middle of the area, began a volume at 08:02 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, 8.0 hours before the alert went out and 146 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: 2662 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 271 m²/s²
0-3 km storm-relative helicity: 572 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
May 14, 10:56 PM EDT	Mesoscale Discussion	SPC	Baraga, Dickinson, Iron, Marquette, Menominee	64 min
May 15, 1:15 PM EDT	Mesoscale Discussion	SPC	Barry, Berrien, Branch, Calhoun, Cass, Clinton and 16 more	90 min
May 15, 1:53 PM EDT	Severe Thunderstorm Watch	SPC	Allegan, Barry, Bay, Berrien, Branch, Calhoun and 30 more	7 hr
May 15, 4:32 PM EDT	Mesoscale Discussion	SPC	Allegan, Arenac, Barry, Bay, Berrien, Branch and 31 more	58 min
May 15, 7:25 PM EDT	Mesoscale Discussion	SPC	Arenac, Barry, Bay, Branch, Calhoun, Clinton and 22 more	65 min

Nearby

Mesoscale Discussions in Michigan, 2007 Every mesoscale discussion in 2007

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.