Alert archive / Michigan / Mesoscale Discussions in 2003

Mesoscale Discussion 2261

August 26, 200318 counties in Michigan

The Storm Prediction Center issued this mesoscale discussion at Aug 26, 2003, 3:49 AM EDT for 18 counties in Michigan. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: Aug 26, 2003, 3:49 AM EDT (07:49 UTC)
Expired: Aug 26, 2003, 5:45 AM EDT
In force: 116 min
Issued by: the Storm Prediction Center

Counties Allegan County, MI, Barry County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Clinton County, MI, Eaton County, MI, Hillsdale County, MI, Ingham County, MI, Ionia County, MI, Jackson County, MI, Kalamazoo County, MI, Kent County, MI, Muskegon County, MI, Ottawa County, MI, Saint Joseph County, MI, Shiawassee County, MI, Van Buren County, MI

The radar

The Grand Rapids radar (KGRR), 20 km from the middle of the area, began a volume at 07:49 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, 7.8 hours before the alert went out and 191 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: 1653 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 1167 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 85 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.6

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 25, 11:02 PM EDT	Mesoscale Discussion	SPC	Gogebic	58 min
Aug 26, 12:27 AM EDT	Mesoscale Discussion	SPC	Monroe, Wayne	63 min
Aug 26, 2:35 AM EDT	Mesoscale Discussion	SPC	Clare, Gladwin, Isabella, Lake, Mecosta, Midland and 3 more	85 min
Aug 26, 5:41 AM EDT	Mesoscale Discussion	SPC	Antrim, Cheboygan, Crawford, Emmet, Montmorency, Oscoda and 1 more	94 min
Aug 26, 6:00 AM EDT	Severe Thunderstorm Watch	SPC	Alpena, Antrim, Charlevoix, Cheboygan, Crawford, Emmet and 7 more	4 hr
Aug 26, 7:47 AM EDT	Mesoscale Discussion	SPC	Alpena, Crawford, Montmorency, Oscoda, Presque Isle	58 min
Aug 26, 9:10 AM EDT	Severe Thunderstorm Watch	SPC	Monroe	5 hr
Aug 26, 2:15 PM EDT	Severe Thunderstorm Watch	SPC	Berrien, Branch, Cass, Saint Joseph	4 hr

Nearby

Mesoscale Discussions in Michigan, 2003 Every mesoscale discussion in 2003

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.