Alert archive / Michigan / Mesoscale Discussions in 2003

Mesoscale Discussion 456

April 14, 200310 counties in Michigan; 5 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Apr 14, 2003, 10:47 PM EDT for 10 counties in Michigan; 5 counties in Wisconsin. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Apr 14, 2003, 10:47 PM EDT (02:47 UTC)
Expired: Apr 15, 2003, 1:45 AM EDT
In force: 3 hr
Issued by: the Storm Prediction Center

Counties Alger County, MI, Chippewa County, MI, Delta County, MI, Dickinson County, MI, Gogebic County, MI, Iron County, MI, Luce County, MI, Mackinac County, MI, Marquette County, MI, Schoolcraft County, MI, Florence County, WI, Forest County, WI, Iron County, WI, Oneida County, WI, Vilas County, WI

The radar

The Marquette radar (KMQT), 44 km from the middle of the area, began a volume at 02:47 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 00:00Z, 2.8 hours before the alert went out and 190 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: 2983 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 160 m²/s²
0-3 km storm-relative helicity: 342 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
Apr 15, 5:58 PM EDT	Mesoscale Discussion	SPC	Alpena, Antrim, Arenac, Benzie, Cheboygan, Clare and 15 more	92 min
Apr 15, 3:53 PM EDT	Mesoscale Discussion	SPC	Brown, Calumet, Clark, Jackson, Kewaunee, Langlade and 13 more	3 hr
Apr 15, 5:07 PM EDT	Mesoscale Discussion	SPC	Pierce, Saint Croix	2 hr
Apr 15, 6:35 PM EDT	Severe Thunderstorm Watch	SPC	Barron, Buffalo, Chippewa, Clark, Dunn, Eau Claire and 11 more	6 hr

Nearby

Mesoscale Discussions in Michigan, 2003 Mesoscale Discussions in Wisconsin, 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.