A powerful storm originating in the lee of the Canadian Rockies tracked across the Upper Great Lakes bringing storm force winds to much of Lake Superior on the 3rd.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS MQT wrote it up.
A powerful storm originating in the lee of the Canadian Rockies tracked across the Upper Great Lakes bringing storm force winds to much of Lake Superior on the 3rd.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Marquette, MI wrote its last area forecast discussion before the first event at Sep 3, 6:40 AM EST, 1 hour 20 minutes earlier.
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</html>The national radar mosaic for the moment the first event began.
7 marine high wind. Local standard time, as filed.
The Rock of Ages Light measured a storm force west wind gust to 60 mph during the period.
The Stannard Rock Light station measured storm force winds through the period with a peak west wind gust of 71 mph at 10:03 am EST.
The Passage Island Light station measured storm force winds through the period with a peak west wind gust of 71 mph at 10:00 am EST.
A ship captain northwest of Marquette reported west wind gusts between 60 and 70 mph during the period.
Storm force west winds were reported during the period at Granite Island Light with a peak gust of 61 mph at 10:40 am EST.
The Grand Marais GLOS station measured a peak gust of 59 mph.
The Grand Marais GLOS station measured a peak gust of 59 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Lake Superior in 2020Every state in 2020This day in weather history
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 921802, 921805, 921806, 921803, 921807, 921808, 921809.