Alert archive / Michigan / Mesoscale Discussions in 2007

Mesoscale Discussion 1856

August 23, 200714 counties in Michigan

The Storm Prediction Center issued this mesoscale discussion at Aug 23, 2007, 12:01 AM EDT for 14 counties in Michigan. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Aug 23, 2007, 12:01 AM EDT (04:01 UTC)
Expired: Aug 23, 2007, 1:00 AM EDT
In force: 59 min
Issued by: the Storm Prediction Center

Counties Clinton County, MI, Eaton County, MI, Genesee County, MI, Gratiot County, MI, Ingham County, MI, Lapeer County, MI, Livingston County, MI, Macomb County, MI, Oakland County, MI, Saginaw County, MI, Saint Clair County, MI, Sanilac County, MI, Shiawassee County, MI, Tuscola County, MI

The radar

The Detroit radar (KDTX), 53 km from the middle of the area, began a volume at 04:00 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, 4.0 hours before the alert went out and 51 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: 1963 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 1187 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 123 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
Aug 22, 8:19 PM EDT	Severe Thunderstorm Watch	SPC	Allegan, Barry, Clinton, Eaton, Genesee, Gratiot and 16 more	4 hr
Aug 22, 8:21 PM EDT	Mesoscale Discussion	SPC	Berrien	2 hr
Aug 23, 2:48 AM EDT	Mesoscale Discussion	SPC	Barry, Branch, Calhoun, Clinton, Eaton, Genesee and 15 more	27 min
Aug 23, 3:07 PM EDT	Mesoscale Discussion	SPC	Allegan, Arenac, Barry, Bay, Berrien, Branch and 39 more	83 min
Aug 23, 4:09 PM EDT	Severe Thunderstorm Watch	SPC	Allegan, Barry, Bay, Berrien, Branch, Calhoun and 32 more	8 hr
Aug 23, 6:38 PM EDT	Mesoscale Discussion	SPC	Allegan, Arenac, Barry, Bay, Berrien, Branch and 34 more	97 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.