637
FZUS63 KMQT 160801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM EDT Wed Sep 16 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...

This morning, 30.3 inch high pressure west of Lake Superior builds
to 30.4 inches as it moves over the lake. The high weakens to 30.3
inches over Quebec early Thursday morning as 29.9 inch low pressure
moves slong the western Hudson Bay shoreline. This will pass a weak
30.2 inch trough over Lake Superior Thursday. Meanwhile, 30.4 inch
high pressure develops over North Dakota and Manitoba. This high
moves over northern Ontario and Lake Superior by Friday morning as
the low pushes into Quebec and another 29.9 inch low develops over
South Dakota and Nebraska. The high weakens to 30.3 inches as it
moves to the Quebec/Ontario line Saturday morning as the low shifts
to the Upper Mississippi Valley. By Sunday morning, another 30.3
inch high will move over northwestern Ontario as 29.9 inch low
pressure extends across the southern Great Lakes basin. The high
shifts to northeastern Ontario Monday morning.




LSZ162-162000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EDT Wed Sep 16 2026 /301 AM CDT Wed Sep 16 2026/

.EARLY THIS MORNING...North winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...Northeast winds 5 to 15 knots veering east in the
afternoon. A slight chance of showers by mid afternoon. Waves
calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots backing northwest late.
A slight chance of showers. Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...North winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 15 to 25 knots. A chance of showers. Waves
building to 1 to 3 feet.
.FRIDAY NIGHT...East winds 15 to 25 knots. Waves building to 2 to
4 feet.
.SATURDAY...Northeast winds 20 to 30 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.
.SUNDAY...Northeast gales to 35 knots becoming east 20 to
30 knots. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.

$$

LSZ263-162000-
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-
401 AM EDT Wed Sep 16 2026

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves 1 to
3 feet subsiding to calm to 2 feet.
.TODAY...North winds 5 to 15 knots becoming northeast less than
10 knots in the afternoon, then becoming east 5 to 15 knots late.
Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight, then veering southwest late. A slight chance of
showers. Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...North winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight. Waves building to 1 to 3 feet.
.FRIDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Waves 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 15 to 25 knots becoming northeast 10 to
20 knots. Waves calm to 2 feet.
.SUNDAY...Northeast winds 20 to 30 knots veering east. Waves
building to 2 to 4 feet, then subsiding to calm to 2 feet.

$$

LSZ264-162000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 AM EDT Wed Sep 16 2026

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TODAY...North winds 5 to 15 knots diminishing to less than
10 knots in the afternoon, then veering southeast late. Waves
subsiding to calm to 2 feet.
.TONIGHT...Southeast winds less than 10 knots becoming south 5 to
15 knots after midnight. A chance of showers. Waves calm to
2 feet.
.THURSDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...North winds 5 to 15 knots veering northeast
after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.SATURDAY...East winds 5 to 15 knots backing northeast. Waves
calm to 2 feet.
.SUNDAY...Northeast winds 10 to 20 knots veering east. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ265-162000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 AM EDT Wed Sep 16 2026

.EARLY THIS MORNING...Northwest winds 10 to 20 knots. Waves calm
to 2 feet.
.TODAY...Northwest winds 5 to 15 knots veering northeast in the
afternoon, then veering east late. Waves calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering south late. A
slight chance of showers. Waves calm to 2 feet.
.THURSDAY...West winds 10 to 20 knots veering northwest late.
Waves calm to 2 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots becoming northeast
15 to 25 knots after midnight. Waves building to 1 to 3 feet.
.FRIDAY...East winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots. Waves calm to
2 feet.
.SATURDAY...East winds 15 to 25 knots becoming northeast 10 to
20 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.SUNDAY...Northeast winds 15 to 25 knots veering east. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ266-162000-
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-
401 AM EDT Wed Sep 16 2026

.EARLY THIS MORNING...Northwest winds 10 to 20 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TODAY...North winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon, then veering northeast late. Waves subsiding to
calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering south after
midnight. A slight chance of showers. Waves calm to 2 feet.
.THURSDAY...Southwest winds 10 to 20 knots veering northwest
late. Waves calm to 2 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots becoming northeast
15 to 25 knots after midnight. Waves building to 1 to 3 feet.
.FRIDAY...East winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots becoming southeast 10 to
20 knots after midnight. Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots backing northeast. Waves
calm to 2 feet.
.SUNDAY...Northeast winds 10 to 20 knots veering east. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ267-162000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 AM EDT Wed Sep 16 2026

.EARLY THIS MORNING...Northwest winds 10 to 20 knots. Waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet.
.TODAY...Northwest winds 10 to 20 knots becoming north 5 to
15 knots in the afternoon. Waves subsiding to calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering south after midnight.
A slight chance of showers. Waves calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots becoming west 10 to
20 knots in the afternoon, then veering northwest late. Waves
calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves building to 1 to 3 feet.
.FRIDAY...East winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots becoming southeast 10 to
20 knots after midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots backing northeast.
Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots becoming east 10 to
20 knots. Waves building to 1 to 3 feet.

$$

LSZ261-161400-
MAFOR 1609/
Superior West 11710 11800 11100 13200 11100 11200. Waves 2 feet
or less.

Superior North Central 11710 11810 12800 12300 12400. A chance of
showers tonight. Waves 1 to 3 feet subsiding to 1 foot or less
today. Waves 1 foot or less tonight.

Superior South Central 11720 11710 11800 11100 11200 12300 11410.
Waves 1 to 3 feet.

Superior East 12710 12700 11800 11200 11300 11400. Waves 3 to 5
feet subsiding to 2 to 3 feet today. Waves 2 feet or less
tonight.

$$

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