619
FZUS63 KMQT 031401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 AM EDT Thu Sep 3 2026

For waters beyond 5 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 extends over Lake Superior today from a 30.2 inch
high over Hudson Bay. The ridge over the lake will gradually
strengthen 30.1 inches through this weekend as a 29.8 inch low over
Quebec shifts east towards Nova Scotia and deepens to 29.5 inches.
Ridging builds to 30.2 inches over the lake by early next week as
high pressure over Hudson Bay strengthens to 30.4 inches. Broad
troughing of 29.5 to 29.6 inches will persist over the Rockies and
Northern Plains through the period.



LSZ162-032000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1000 AM EDT Thu Sep 3 2026 /900 AM CDT Thu Sep 3 2026/

.REST OF TODAY...Northeast winds 10 to 20 knots becoming east
15 to 25 knots in the afternoon, then becoming northeast 20 to
30 knots late. Waves calm to 2 feet building to 2 to 4 feet.
.TONIGHT...East winds 15 to 25 knots becoming northeast 10 to
20 knots after midnight. A slight chance of showers and
thunderstorms. Waves subsiding to 1 to 3 feet.
.FRIDAY...Northeast winds 15 to 25 knots increasing to 20 to
30 knots late. A slight chance of showers through early
afternoon. Waves building to 2 to 4 feet.
.FRIDAY NIGHT...Northeast winds 15 to 25 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...East winds 5 to 15 knots becoming northeast 10 to
20 knots. A chance of showers and thunderstorms. Waves calm to
2 feet.
.MONDAY...East gales to 35 knots. A chance of showers. Showers
likely. Waves building to 4 to 7 feet occasionally to 9 feet.

$$

LSZ263-032000-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
1000 AM EDT Thu Sep 3 2026

.REST OF TODAY...Northeast winds 5 to 15 knots increasing to
10 to 20 knots in the afternoon, then becoming east 20 to
30 knots late. Waves calm to 2 feet building to 1 to 3 feet.
.TONIGHT...East winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A slight chance of showers and
thunderstorms. Patchy fog after midnight. Waves subsiding to calm
to 2 feet.
.FRIDAY...East winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. Waves building to 2 to 4 feet.
.FRIDAY NIGHT...East winds 15 to 25 knots diminishing to 5 to
15 knots after midnight. A slight chance of showers through
midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots veering southeast
after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots increasing to 15 to 25 knots.
A chance of showers. Waves building to 1 to 3 feet.
.MONDAY...East winds 20 to 30 knots veering southeast. A chance
of showers. Showers likely. Waves building to 4 to 7 feet
occasionally to 9 feet.

$$

LSZ264-032000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1000 AM EDT Thu Sep 3 2026

.REST OF TODAY...Northeast winds less than 10 knots increasing to
5 to 15 knots in the afternoon, then veering east late. Patchy
fog. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots. Patchy fog. Waves calm to
2 feet.
.FRIDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots. A chance of showers. Waves calm to 2 feet.
.MONDAY...East winds 15 to 25 knots becoming southeast 20 to
30 knots. A chance of showers, then showers likely. Waves
building to 4 to 7 feet occasionally to 9 feet.

$$

LSZ265-032000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1000 AM EDT Thu Sep 3 2026

.REST OF TODAY...Northeast winds 5 to 15 knots becoming east
10 to 20 knots late. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots. Patchy fog after midnight.
Waves calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. A slight chance of showers through early
afternoon. Waves building to 1 to 3 feet.
.FRIDAY NIGHT...East winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots increasing to 15 to 25 knots
by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots. Waves calm to
2 feet.
.SUNDAY...Southeast winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
.MONDAY...East winds 15 to 25 knots becoming southeast 20 to
30 knots. A chance of showers, then showers likely. Waves
building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ266-032000-
Lake Superior East of a line from Manitou Island to Marquette MI
and West of a line from Grand Marais MI to the US/Canadian Border
Beyond 5NM from shore-
1000 AM EDT Thu Sep 3 2026

.REST OF TODAY...North winds 5 to 15 knots veering northeast in
the afternoon. Patchy fog. Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots veering east after
midnight. Patchy fog through midnight, then areas of dense fog
after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY NIGHT...Northeast winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots becoming southeast
10 to 20 knots after midnight. Waves calm to 2 feet.
.SUNDAY...Southeast winds 10 to 20 knots veering south. Waves
calm to 2 feet.
.MONDAY...East winds 15 to 25 knots becoming southeast 20 to
30 knots. A chance of showers. Waves building to 4 to 7 feet
occasionally to 9 feet.

$$

LSZ267-032000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1000 AM EDT Thu Sep 3 2026

.REST OF TODAY...Northwest winds 5 to 15 knots veering north
late. Patchy fog. Waves calm to 2 feet.
.TONIGHT...North winds 5 to 15 knots veering east late. Patchy
fog. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots backing north late. Waves calm
to 2 feet.
.FRIDAY NIGHT...Northeast winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots becoming
southeast 10 to 20 knots after midnight. Waves calm to 2 feet.
.SUNDAY...Southeast winds 10 to 20 knots veering south. Waves
calm to 2 feet.
.MONDAY...East winds 10 to 20 knots becoming southeast 15 to
25 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ261-032000-
MAFOR 0315/
Superior West 11210 11120 11130 11230 12220 12230. A chance of
showers overnight. Waves 2 feet or less this afternoon. Waves 2
to 3 feet tonight and Friday morning.

Superior North Central 12100 14200 12210. Waves 1 foot or less.

Superior South Central 11100 11110 12210 11200 13210. Waves 1
foot or less.

Superior East 11700 13800 11103 12204 11210. Waves 1 foot or
less.

$$

WFO MQT

Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes