667
FZUS63 KMQT 240800
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 AM EDT Sat Oct 24 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 30.5 inch high pressure over New England is extending a 30.2 inch
ridge over Lake Superior this morning. By this afternoon, a 29.2
inch low over northern Manitoba drags a 30.1 inch trough over the
west half of Lake Superior. The trough remains over the lake until
tonight. High pressure of 30.6 inches over the Canadian Prairies on
Sunday pushes ridging of 30.4 inches over the Upper Great Lakes. The
high pressure moves over northern Ontario at 30.5 inches Monday into
Tuesday. A weak 30.0 inch low lifts north over Minnesota on Tuesday.
Then, a 29.8 inch low quickly follows a similar northeast track over
the Dakotas/northwestern Minnesota Tuesday night into Wednesday
while the high moves to New England. The low then tracks northeast
over northern Ontario on Wednesday.



LSZ162-242000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 AM EDT Sat Oct 24 2026 /300 AM CDT Sat Oct 24 2026/

.EARLY THIS MORNING...South winds 10 to 20 knots. A chance of
showers. Waves 1 to 3 feet.
.TODAY...South winds 15 to 25 knots veering southwest late. A
chance of showers by mid afternoon. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.TONIGHT...West winds 10 to 20 knots. A slight chance of showers
through midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots. Waves building to 1 to
3 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Northeast winds 10 to 20 knots becoming east 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves building to 1 to 3 feet.
.TUESDAY...East winds 15 to 25 knots diminishing to 10 to
20 knots. Rain showers likely. Waves 1 to 3 feet.
.WEDNESDAY...South winds 10 to 20 knots becoming southwest 20 to
30 knots. Showers likely, then a chance of showers. Waves
subsiding to calm to 2 feet, then building to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ263-242000-
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-
400 AM EDT Sat Oct 24 2026

.EARLY THIS MORNING...South winds 10 to 20 knots. A chance of
showers. Waves 1 to 3 feet building to 2 to 4 feet.
.TODAY...South winds 15 to 25 knots becoming southwest 10 to
20 knots late. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.TONIGHT...West winds 15 to 25 knots diminishing to 5 to
15 knots. A chance of showers through midnight. Waves subsiding
to 1 to 3 feet.
.SUNDAY...West winds 10 to 20 knots. Waves building to 2 to
4 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...North winds 5 to 15 knots veering northeast by mid
afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots veering southeast. A chance
of rain showers. Waves building to 1 to 3 feet.
.WEDNESDAY...South winds 10 to 20 knots becoming southwest gales
to 35 knots. Showers likely. Waves building to 5 to 8 feet
occasionally to 10 feet.

$$

LSZ264-242000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 AM EDT Sat Oct 24 2026

.EARLY THIS MORNING...South winds 10 to 20 knots. A chance of
showers. Waves 1 to 3 feet.
.TODAY...South winds 15 to 25 knots increasing to 20 to 30 knots
in the afternoon, then diminishing to 15 to 25 knots late. A
chance of showers. Waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Southwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. A chance of showers through midnight.
Waves subsiding to 1 to 3 feet.
.SUNDAY...West winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. Waves building to 2 to 4 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...North winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of rain showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...South winds 15 to 25 knots becoming southwest 20 to
30 knots. A chance of showers. Waves building to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ265-242000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 AM EDT Sat Oct 24 2026

.EARLY THIS MORNING...South winds 15 to 25 knots. Waves 1 to
3 feet.
.TODAY...South winds 15 to 25 knots increasing to 20 to 30 knots
in the afternoon. Sprinkles through early afternoon. Waves
building to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...South winds 15 to 25 knots veering west after
midnight. A chance of showers. Waves subsiding to calm to 2 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 10 to 20 knots
late. A slight chance of showers through early afternoon. Waves
building to 1 to 3 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots veering north
after midnight. Waves building to 2 to 4 feet.
.MONDAY...North winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...Northeast winds 10 to 20 knots veering east after
midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 15 to 25 knots. A chance of showers.
Waves building to 2 to 4 feet.
.WEDNESDAY...South winds 20 to 30 knots becoming southwest gales
to 35 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.

$$

LSZ266-242000-
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-
400 AM EDT Sat Oct 24 2026

.EARLY THIS MORNING...South winds 15 to 25 knots. Waves 2 to
4 feet.
.TODAY...South winds 20 to 30 knots increasing to 30 knots with a
few gale force gusts to 35 knots possible in the afternoon.
Sprinkles through early afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet.
.TONIGHT...South winds 20 to 30 knots veering southwest after
midnight, then becoming west 10 to 20 knots late. A chance of
showers. Waves subsiding to 2 to 4 feet.
.SUNDAY...West winds 10 to 20 knots. A chance of showers through
early afternoon. Waves subsiding to 1 to 3 feet, then building to
2 to 4 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots veering north
after midnight. Waves 2 to 4 feet.
.MONDAY...North winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 15 to 25 knots. A chance of rain
showers. Waves building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...South winds 20 to 30 knots veering southwest. A
chance of showers. Waves building to 3 to 6 feet occasionally to
8 feet.

$$

LSZ267-242000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 AM EDT Sat Oct 24 2026

.EARLY THIS MORNING...South winds 10 to 20 knots. Waves 1 to
3 feet.
.TODAY...South winds 15 to 25 knots increasing to 20 to 30 knots
late. Waves building to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...South winds 20 to 30 knots becoming west 15 to
25 knots late. A chance of showers. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.
.SUNDAY...West winds 10 to 20 knots. A chance of showers through
early afternoon. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots veering north
after midnight. Waves building to 2 to 4 feet.
.MONDAY...North winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...Northeast winds 10 to 20 knots veering east after
midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of rain showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY...Southeast winds 20 to 30 knots veering south. A
chance of showers. Waves subsiding to 3 to 6 feet occasionally to
8 feet.

$$

LSZ261-241400-
MAFOR 2409/
Superior West 13420 12520 11620 12610. A chance of showers this
afternoon and evening. Waves 1 to 3 feet building to 2 to 4 feet
today. Waves 1 to 3 feet tonight.

Superior North Central 11420 11430 12440 11430 11520 11620 11610.
A chance of showers tonight. Waves 1 to 3 feet building to 4 to 7
feet today. Waves 3 to 6 feet subsiding to 2 to 4 feet tonight.

Superior South Central 11430 14440 11440 11540 11620. A chance of
showers tonight. Waves 2 to 4 feet building to 3 to 6 feet today.
Waves 3 to 5 feet subsiding to 1 to 3 feet tonight.

Superior East 11420 13430 13440 11536. Waves 2 to 4 feet building
to 3 to 5 feet today. Waves 4 to 7 feet subsiding to 3 to 5 feet
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