Alert archive / Michigan / Mesoscale Discussions in 2003

Mesoscale Discussion 1683

July 7, 20034 counties in Michigan

The Storm Prediction Center issued this mesoscale discussion at Jul 7, 2003, 5:42 PM EDT for 4 counties in Michigan. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jul 7, 2003, 5:42 PM EDT (21:42 UTC)
Expired: Jul 7, 2003, 8:15 PM EDT
In force: 3 hr
Issued by: the Storm Prediction Center

Counties Chippewa County, MI, Luce County, MI, Mackinac County, MI, Schoolcraft County, MI

The radar

The Marquette radar (KMQT), 141 km from the middle of the area, began a volume at 21:43 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 12:00Z, 9.7 hours before the alert went out and 423 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: 12 J/kg
Mixed-layer CIN: -211 J/kg
Mixed-layer LCL: 571 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 110 m²/s²
0-3 km storm-relative helicity: 144 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 6, 9:46 PM EDT	Mesoscale Discussion	SPC	Allegan, Barry, Bay, Berrien, Branch, Calhoun and 32 more	59 min
Jul 7, 9:30 AM EDT	Mesoscale Discussion	SPC	Allegan, Berrien, Branch, Calhoun, Cass, Hillsdale and 4 more	60 min
Jul 7, 9:45 AM EDT	Severe Thunderstorm Watch	SPC	Allegan, Barry, Berrien, Branch, Calhoun, Cass and 13 more	4 hr
Jul 7, 11:14 AM EDT	Mesoscale Discussion	SPC	Barry, Branch, Calhoun, Cass, Eaton, Hillsdale and 10 more	61 min
Jul 7, 1:14 PM EDT	Mesoscale Discussion	SPC	Branch, Calhoun, Eaton, Hillsdale, Ingham, Jackson and 6 more	61 min
Jul 7, 1:54 PM EDT	Mesoscale Discussion	SPC	Dickinson, Iron	66 min
Jul 7, 3:35 PM EDT	Mesoscale Discussion	SPC	Delta, Dickinson, Marquette, Menominee	115 min
Jul 7, 6:30 PM EDT	Tornado Watch	SPC	Berrien	6 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.