506
FZUS63 KMQT 162000
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
Issued by National Weather Service Gaylord MI
400 PM EDT Thu Oct 16 2025

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...30.2 inch high pressure centered east of Lake Superior
will moves east tonight as a 29.2 inch low pressure center lifts
northeast out of the Dakotas and into Manitoba by Friday morning.
A cold front (29.5 inch pressure trough) crosses Lake Superior
late Friday into Saturday...a new area of low pressure will
develop along the front over the mid Mississippi Valley Saturday
and strengthen to at least 29.2 inches as it lifts across Michigan
on Sunday. This low will lift northeast into northern Quebec and
be replaced by a 29.8 inch surface ridge across Lake Superior
Monday.

LSZ162-170400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 PM EDT Thu Oct 16 2025 /300 PM CDT Thu Oct 16 2025/

.LATE THIS AFTERNOON...East winds 10 to 20 knots. A chance of
rain. Waves calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then becoming south 10 to 20 knots late.
A slight chance of thunderstorms through midnight. A chance of
rain. Waves building to 1 to 3 feet, then subsiding to calm to
2 feet.
.FRIDAY...South winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon, then veering southwest late. A chance of rain.
Waves building to 2 to 4 feet.
.FRIDAY NIGHT...Southwest winds 20 to 30 knots diminishing to
10 to 20 knots. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.
.SATURDAY...West winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves building to 1 to 3 feet.
.SUNDAY...Northwest winds 15 to 25 knots backing west by mid
afternoon. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of rain. Waves building to 2 to 4 feet.
.TUESDAY...Northwest winds 20 to 30 knots. A chance of rain.
Waves subsiding to 1 to 3 feet, then building to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ263-170400-
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 PM EDT Thu Oct 16 2025

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. Rain
likely. Waves calm to 2 feet building to 1 to 3 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering south after
midnight. A chance of rain. Waves building to 2 to 4 feet.
.FRIDAY...South winds 10 to 20 knots increasing to 15 to 25 knots
late. A chance of rain. Waves subsiding to 1 to 3 feet, then
building to 2 to 4 feet.
.FRIDAY NIGHT...Southwest winds 20 to 30 knots diminishing to
15 to 25 knots late. A slight chance of rain through midnight.
Waves building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...West winds 15 to 25 knots. Waves subsiding to 2 to
4 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots becoming northwest
15 to 25 knots after midnight. Waves subsiding to 1 to 3 feet,
then building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...Northwest winds 20 to 30 knots. Waves building to 4 to
8 feet occasionally to 10 feet.
.SUNDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to 2 to 4 feet.
.MONDAY...Southwest winds 15 to 25 knots becoming south 20 to
30 knots. A chance of rain. Waves subsiding to calm to 2 feet,
then building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...Northwest gales to 40 knots. A chance of rain. Waves
building to 7 to 10 feet occasionally to 13 feet.

$$

LSZ264-170400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 PM EDT Thu Oct 16 2025

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. A chance
of rain. Waves 1 to 3 feet.
.TONIGHT...Southeast winds 15 to 25 knots veering south after
midnight, then diminishing to 10 to 20 knots late. Rain. Waves
building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...South winds 10 to 20 knots. A chance of rain. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots veering southwest
after midnight. A chance of rain through midnight. Waves 3 to
6 feet occasionally to 8 feet.
.SATURDAY...West winds 15 to 25 knots. Waves subsiding to 2 to
4 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots becoming northwest
15 to 25 knots after midnight. Waves subsiding to 1 to 3 feet,
then building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...Northwest winds 20 to 30 knots. Waves building to 6 to
9 feet occasionally to 11 feet, then subsiding to 4 to 7 feet
occasionally to 9 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet.
.MONDAY...West winds 15 to 25 knots backing south. A chance of
rain. Waves subsiding to 1 to 3 feet, then building to 3 to
5 feet occasionally to 7 feet.
.TUESDAY...Northwest gales to 40 knots. A chance of rain. Waves
building to 4 to 8 feet occasionally to 10 feet.

$$

LSZ265-170400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 PM EDT Thu Oct 16 2025

.LATE THIS AFTERNOON...Southeast winds 15 to 25 knots. A slight
chance of rain. Waves 1 to 3 feet.
.TONIGHT...Southeast winds 15 to 25 knots veering south after
midnight. Rain and a slight chance of thunderstorms through
midnight, then a chance of rain after midnight. Waves building to
3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.FRIDAY...South winds 15 to 25 knots. A chance of rain. Waves
2 to 4 feet.
.FRIDAY NIGHT...South winds 20 to 30 knots becoming southwest
15 to 25 knots after midnight, then diminishing to 10 to 20 knots
late. A chance of rain. Waves subsiding to calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots. A slight chance of rain.
Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots becoming northwest
15 to 25 knots after midnight. A chance of rain. Waves building
to 2 to 4 feet.
.SUNDAY...North winds 20 to 30 knots becoming northwest gales to
35 knots by mid afternoon. A chance of rain. Waves building to
4 to 8 feet occasionally to 10 feet.
.SUNDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...West winds 15 to 25 knots backing south. A chance of
rain. Waves subsiding to calm to 2 feet, then building to 1 to
3 feet.
.TUESDAY...South gales to 35 knots becoming west gales to
45 knots. Rain likely, then a chance of rain. Waves building to
4 to 7 feet occasionally to 9 feet.

$$

LSZ266-170400-
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 PM EDT Thu Oct 16 2025

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. A slight
chance of rain. Waves 1 to 3 feet.
.TONIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots after midnight. A slight chance of thunderstorms through
midnight. Rain. Waves building to 4 to 7 feet occasionally to
9 feet.
.FRIDAY...South winds 20 to 30 knots. A chance of rain. Waves
subsiding to 3 to 6 feet occasionally to 8 feet, then building to
4 to 7 feet occasionally to 9 feet.
.FRIDAY NIGHT...South winds 20 to 30 knots becoming southwest
10 to 20 knots late. Rain through midnight, then a chance of rain
after midnight. Waves building to 5 to 8 feet occasionally to
10 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...Southwest winds 10 to 20 knots veering west by mid
afternoon. A chance of rain. Waves subsiding to 2 to 4 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots becoming north 15 to
25 knots after midnight. A chance of rain. Waves subsiding to
1 to 3 feet, then building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...North winds 20 to 30 knots backing northwest by mid
afternoon. A chance of rain. Waves building to 10 to 14 feet
occasionally to 18 feet.
.SUNDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Waves subsiding to 5 to 8 feet
occasionally to 10 feet.
.MONDAY...West winds 15 to 25 knots backing south. A chance of
rain. Waves subsiding to 2 to 4 feet, then building to 3 to
5 feet occasionally to 7 feet.
.TUESDAY...South gales to 35 knots becoming west gales to
40 knots. Rain likely, then a chance of rain. Waves building to
5 to 9 feet occasionally to 11 feet.

$$

LSZ267-170400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 PM EDT Thu Oct 16 2025

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...South winds 10 to 20 knots increasing to 20 to
30 knots. Rain. Waves building to 3 to 5 feet occasionally to
7 feet.
.FRIDAY...South winds 20 to 30 knots. A chance of rain. Waves
3 to 5 feet occasionally to 7 feet.
.FRIDAY NIGHT...South winds to 30 knots with a few gale force
gusts to 35 knots possible diminishing to 15 to 25 knots. Rain. A
slight chance of thunderstorms after midnight. Waves building to
3 to 6 feet occasionally to 8 feet.
.SATURDAY...Southwest winds 10 to 20 knots veering west by mid
afternoon. A chance of rain. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots backing north after
midnight. Rain likely. Waves building to 2 to 4 feet.
.SUNDAY...North winds 15 to 25 knots becoming northwest gales to
35 knots by mid afternoon. Rain likely through early afternoon,
then a chance of rain by mid afternoon. Waves building to 10 to
14 feet occasionally to 18 feet.
.SUNDAY NIGHT...Northwest gales to 35 knots diminishing to 20 to
30 knots after midnight. A chance of rain through midnight. Waves
subsiding to 5 to 8 feet occasionally to 10 feet.
.MONDAY...West winds 15 to 25 knots backing south. A chance of
rain, then rain likely. Waves subsiding to 2 to 4 feet, then
building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...Southeast winds 20 to 30 knots becoming west gales to
35 knots. Rain. Waves building to 9 to 12 feet occasionally to
15 feet.

$$

LSZ261-170400-
MAFOR 1621/
Superior West 11226 11320 11316 12410 13420. Waves 1 to 3 feet.

Superior North Central 11320 11336 11430 12436 12430 11420. Waves
1 to 3 feet building to 3 to 6 feet tonight. Waves 3 to 6 feet
Friday.

Superior South Central 11320 11336 12436 14430. Waves 2 to 4 feet
building to 3 to 5 feet tonight. Waves 3 to 5 feet Friday.

Superior East 11310 11320 14436 12430. Waves 1 to 3 feet building
to 3 to 5 feet tonight. Waves 3 to 6 feet Friday.

$$

JPB

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

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