157
FZUS63 KMQT 160201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 PM EDT Wed Oct 15 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 over Lake Superior tonight will weaken and
shift east on Thursday as a deepening 29.3 inch low develops over
the Northern Plains Thursday night and and lifts near Lake Winnipeg
at 29.2 inches Friday morning. This will send 29.5 inch troughing
over Lake Superior Friday into Saturday as the low moves to the
Hudson Bay. A secondary low deepens to 29.1 inches over Lower
Michigan and moves over Quebec by Sunday night. 29.8 inch ridging
returns to Lake Superior on Monday.


LSZ162-160800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Wed Oct 15 2025 /901 PM CDT Wed Oct 15 2025/

.REST OF TONIGHT...East winds 5 to 15 knots veering southeast
late. Waves calm to 2 feet.
.THURSDAY...Southeast winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Showers through midnight, then a chance of
showers after midnight. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.FRIDAY...South winds 15 to 25 knots increasing to 20 to 30 knots
by mid afternoon. A chance of showers. Waves building to 3 to
5 feet occasionally to 7 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. A slight chance of showers through
midnight. Waves subsiding to 1 to 3 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 2 to 4 feet.
.SUNDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots becoming west 15 to
25 knots. A chance of showers. Waves building to 1 to 3 feet.

$$

LSZ263-160800-
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-
1001 PM EDT Wed Oct 15 2025

.REST OF TONIGHT...East winds less than 10 knots veering
southeast after midnight, then becoming south 5 to 15 knots late.
Waves calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight, then increasing to 15 to 25 knots late. Showers.
Waves building to 2 to 4 feet.
.FRIDAY...South winds 20 to 30 knots. A chance of showers. Waves
building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY NIGHT...Southwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. A chance of showers. Waves
subsiding to 2 to 4 feet.
.SATURDAY...West winds 15 to 25 knots. Waves subsiding to 1 to
3 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots increasing to
20 to 30 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...Northwest gales to 35 knots becoming west 20 to
30 knots. Waves building to 5 to 8 feet occasionally to 10 feet,
then subsiding to 2 to 4 feet.
.MONDAY...Southwest winds 15 to 25 knots becoming west 20 to
30 knots. A chance of showers. Waves subsiding to 1 to 3 feet,
then building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ264-160800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 PM EDT Wed Oct 15 2025

.REST OF TONIGHT...West winds less than 10 knots backing south
late. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then backing southeast late. A chance
of showers by mid afternoon. Waves building to 1 to 3 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots. Showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...South winds 15 to 25 knots. A chance of showers. Waves
building to 4 to 7 feet occasionally to 9 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots. A chance of
showers. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...West winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots increasing to
20 to 30 knots after midnight. A chance of showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...Northwest gales to 35 knots diminishing to 15 to
25 knots. A chance of showers. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 2 to 4 feet.
.MONDAY...Southwest winds 15 to 25 knots becoming west 20 to
30 knots. A chance of showers. Waves building to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ265-160800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EDT Wed Oct 15 2025

.REST OF TONIGHT...Northwest winds less than 10 knots backing
west after midnight, then becoming south 5 to 15 knots late.
Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots in the afternoon, then increasing to 15 to 25 knots
late. A chance of showers by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots late. Showers. Waves building to 2 to 4 feet.
.FRIDAY...South winds 20 to 30 knots. A chance of showers. Waves
2 to 4 feet.
.FRIDAY NIGHT...South winds 20 to 30 knots becoming southwest
15 to 25 knots after midnight. Showers likely through midnight,
then a chance of showers after midnight. Waves subsiding to calm
to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots veering northwest by
mid afternoon. A chance of showers. Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots increasing to
20 to 30 knots after midnight. A chance of showers. Waves
building to 1 to 3 feet.
.SUNDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots. A chance of showers. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to calm to 2 feet.
.MONDAY...West winds 15 to 25 knots increasing to 20 to 30 knots.
A chance of showers. Waves building to 1 to 3 feet.

$$

LSZ266-160800-
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-
1001 PM EDT Wed Oct 15 2025

.REST OF TONIGHT...Northwest winds 5 to 15 knots diminishing to
less than 10 knots after midnight, then becoming north 5 to
15 knots late. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots late. A slight chance of showers by mid afternoon. Waves
building to 1 to 3 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Showers. Waves building to 4 to 7 feet
occasionally to 9 feet.
.FRIDAY...South gales to 35 knots. Showers likely through early
afternoon, then a chance of showers by mid afternoon. Waves
building to 6 to 9 feet occasionally to 11 feet.
.FRIDAY NIGHT...South gales to 35 knots diminishing to 20 to
30 knots after midnight. Showers through midnight. A slight
chance of thunderstorms. A chance of showers after midnight.
Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...Southwest winds 10 to 20 knots veering west by mid
afternoon. A chance of showers through early afternoon, then
showers likely by mid afternoon. Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Showers likely. Waves building to 3 to
5 feet occasionally to 7 feet.
.SUNDAY...Northwest gales to 35 knots. Showers likely. Waves
building to 7 to 10 feet occasionally to 13 feet, then subsiding
to 3 to 6 feet occasionally to 8 feet.
.MONDAY...West winds 15 to 25 knots. A chance of showers. Waves
subsiding to 2 to 4 feet, then building to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ267-160800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EDT Wed Oct 15 2025

.REST OF TONIGHT...Northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight. Waves calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots veering south in the
afternoon, then backing southeast late. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots becoming south
15 to 25 knots after midnight, then increasing to 20 to 30 knots
late. Showers. Waves building to 3 to 5 feet occasionally to
7 feet.
.FRIDAY...South winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. Showers through early afternoon, then
a chance of showers by mid afternoon. Waves building to 4 to
7 feet occasionally to 9 feet.
.FRIDAY NIGHT...South gales to 35 knots diminishing to 20 to
30 knots after midnight. Showers and a slight chance of
thunderstorms. Waves subsiding to 3 to 5 feet occasionally to
7 feet.
.SATURDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Showers. Waves subsiding to calm to
2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots backing north
after midnight. Showers. Waves building to 2 to 4 feet.
.SUNDAY...Northwest winds 20 to 30 knots. Showers likely, then a
chance of showers. Waves building to 7 to 10 feet occasionally to
13 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.
.MONDAY...West winds 15 to 25 knots. A chance of showers. Waves
subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ261-160800-
MAFOR 1603/
Superior West 13300 12310 11316 11310 11316. Waves 2 feet or
less.

Superior North Central 12600 11400 11410 11420 12320 11336. Waves
2 feet or less overnight and Thursday. Waves 1 to 3 feet building
to 2 to 4 feet Thursday evening.

Superior South Central 11700 11600 11300 11400 11410 12320 11336.
Waves 2 feet or less overnight and Thursday. Waves 1 to 3 feet
Thursday evening.

Superior East 11700 11800 11100 11300 11400 11300 11310 11326.
Waves 2 feet 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