Alert archive / Michigan / Mesoscale Discussions in 2021

Mesoscale Discussion 1704

September 7, 20218 counties in Michigan

The Storm Prediction Center issued this mesoscale discussion at Sep 7, 2021, 1:49 PM EDT for 8 counties in Michigan. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Sep 7, 2021, 1:49 PM EDT (17:49 UTC)
Expired: Sep 7, 2021, 3:15 PM EDT
In force: 86 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 488

Counties Gratiot County, MI, Isabella County, MI, Mecosta County, MI, Montcalm County, MI, Muskegon County, MI, Newaygo County, MI, Oceana County, MI, Ottawa County, MI

The radar

The Grand Rapids radar (KGRR), 73 km from the middle of the area, began a volume at 17:52 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 490Sep 7, 3:20 PM EDT

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
Sep 7, 3:40 AM EDT	Mesoscale Discussion	SPC	Baraga, Gogebic, Houghton, Iron, Ontonagon	3 hr
Sep 7, 8:05 AM EDT	Mesoscale Discussion	SPC	Antrim, Benzie, Cheboygan, Emmet, Grand Traverse, Kalkaska and 1 more	115 min
Sep 7, 10:15 AM EDT	Mesoscale Discussion	SPC	Antrim, Benzie, Crawford, Grand Traverse, Kalkaska, Lake and 10 more	90 min
Sep 7, 11:47 AM EDT	Mesoscale Discussion	SPC	Clare, Gladwin, Isabella, Lake, Manistee, Mason and 10 more	58 min
Sep 7, 12:21 PM EDT	Severe Thunderstorm Watch	SPC	Alcona, Arenac, Bay, Clare, Crawford, Gladwin and 20 more	6 hr
Sep 7, 2:48 PM EDT	Mesoscale Discussion	SPC	Barry, Branch, Calhoun, Cass, Eaton, Genesee and 14 more	117 min
Sep 7, 3:20 PM EDT	Severe Thunderstorm Watch	SPC	Allegan, Barry, Berrien, Branch, Calhoun, Cass and 24 more	7 hr
Sep 7, 5:37 PM EDT	Mesoscale Discussion	SPC	Allegan, Barry, Berrien, Branch, Calhoun, Cass and 23 more	83 min

Nearby

Mesoscale Discussions in Michigan, 2021 Every mesoscale discussion in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.