Alert archive / Michigan / Mesoscale Discussions in 2017

Mesoscale Discussion 1245

July 6, 2017Houghton County, Ontonagon County, Michigan; Cook County, Lake County, Minnesota

The Storm Prediction Center issued this mesoscale discussion at Jul 6, 2017, 3:00 PM EDT for Houghton County, Ontonagon County, Michigan; Cook County, Lake County, Minnesota. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Jul 6, 2017, 3:00 PM EDT (19:00 UTC)
Expired: Jul 6, 2017, 4:00 PM EDT
In force: 60 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Houghton County, MI, Ontonagon County, MI, Cook County, MN, Lake County, MN

The radar

The Marquette radar (KMQT), 203 km from the middle of the area, began a volume at 19:00 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

Green Bay/Straub, WI (KGRB), launched 12:00Z, 7.0 hours before the alert went out and 371 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: 999 J/kg
Mixed-layer CIN: -115 J/kg
Mixed-layer LCL: 1184 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 99 m²/s²
0-3 km storm-relative helicity: 94 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 6, 6:43 AM EDT	Mesoscale Discussion	SPC	Baraga, Dickinson, Gogebic, Houghton, Iron, Marquette and 1 more	2 hr
Jul 6, 6:04 PM EDT	Mesoscale Discussion	SPC	Gogebic, Iron, Menominee	116 min
Jul 6, 6:54 PM EDT	Severe Thunderstorm Watch	SPC	Baraga, Delta, Dickinson, Gogebic, Houghton, Iron and 3 more	6 hr
Jul 5, 10:51 PM EDT	Mesoscale Discussion	SPC	Beltrami, Clearwater, Kittson, Mahnomen, Marshall, Norman and 4 more	114 min
Jul 5, 11:12 PM EDT	Severe Thunderstorm Watch	SPC	Becker, Clay, Clearwater, Grant, Hubbard, Kittson and 10 more	6 hr
Jul 6, 1:51 AM EDT	Mesoscale Discussion	SPC	Aitkin, Becker, Beltrami, Benton, Carlton, Cass and 28 more	114 min
Jul 6, 4:26 AM EDT	Severe Thunderstorm Watch	SPC	Aitkin, Anoka, Benton, Carlton, Cass, Chisago and 13 more	8 hr

Nearby

Mesoscale Discussions in Michigan, 2017 Mesoscale Discussions in Minnesota, 2017 Every mesoscale discussion in 2017

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.