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Marine Forecast
FZUS63 KMQT 202055

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
355 PM EST Mon Nov 20 2017

For waters beyond five nautical miles of shore on Lake Superior

Waves are the significant wave height - the average of the
highest 1/3 of the wave spectrum. Occasional wave height is the
average of the highest 1/10 of the wave spectrum.

.SYNOPSIS...A 29.9 inch ridge of high pressure over the Lower 
Great Lakes this evening will shift over New England tonight. 
Meanwhile, a 29.2 inch low pressure over northwestern Ontario this
evening will deepen to 29.1 inches as it moves north of Lake 
Superior tonight and reaches James Bay on Tuesday afternoon. A 
30.4 inch high over the Northern Plains Tuesday evening will drift
south into the Central Plains Wednesday morning and weaken to 
30.3 inches over the Ohio Valley on Wednesday night. On Thursday 
morning, a 29.8 inch trough will settle south across the Upper 
Great Lakes. A 30.0 inch ridge will move over the Upper Great 
Lakes Thursday night and into the Lower Great Lakes on Friday 
morning. A 29.0 inch low will move to Lake Winnipeg Friday morning
and track east across northern Ontario Friday evening. This low 
will drag a 29.2 inch trough across Lake Superior on late Friday 
night. A 30.0 inch ridge then builds into the Upper Great Lakes on

MAFOR 2022/
Superior West...Gale Warning in effect...11540 11550 11650 12650
13750. Scattered snow showers Tuesday morning. Waves 1 to 2 feet
building to 8 to 11 feet tonight, and then subsiding to 5 to 9 
feet Tuesday. 

Superior North Central...Gale Warning in effect...11440 12550
11650 11657 11757 11760 11750. Scattered rain and snow showers.
Waves 2 to 4 feet building to 9 to 13 feet tonight.

Superior South Central...Gale Warning in effect...11440 11540
11550 12650 11757 12767. Scattered snow showers. Waves 2 to 4 
feet building to 8 to 12 feet tonight, and then building to 11 to
15 feet Tuesday.

Superior East...Gale Warning in effect...11440 11450 12550 11650 
11657 12757. Scattered rain showers. Waves 3 to 6 feet building 
to 9 to 12 feet tonight, and then building to 11 to 15 feet 



Experimental modernized open lake forecast is available online at

Graphical marine forecasts are available online at:

US Forecasts are Public Domain and derived from the
National Weather Service - (IWIN) and the National Oceanic Atmospheric Administration (NOAA)
Canadian forecasts are obtained from and are copyright of Environment Canada.

All weather information provided by should be used with caution.
We cannot guarantee that the data provided here is 100% accurate or up to date!

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