290
FZUS63 KMQT 271401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM EDT Tue Oct 27 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...

30.5 inch high pressure centered over northern Ontario this morning
shifts east to the Saint Lawrence Seaway this evening, with 30.4
inch ridging over Lake Superior weakening to 30.1 inches through
tonight. A developing 29.8 inch Colorado low lifts through the
Plains on Wednesday, eventually moving across Lake Superior
Wednesday night into early Thursday morning. High pressure of 30.2
to 30.3 inches returns to the Upper Great Lakes by Friday,
strengthening to 30.4 inches over the Lower Great Lakes on Saturday
as ridging of 30.1 to 30.2 inches lingers over Lake Superior through
the weekend.



LSZ162-272000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Tue Oct 27 2026 /901 AM CDT Tue Oct 27 2026/

.REST OF TODAY...East winds 15 to 25 knots. Showers. Waves 2 to
4 feet building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.
.TONIGHT...Southeast winds 10 to 20 knots becoming southwest 5 to
15 knots after midnight. A slight chance of showers. Waves
subsiding to calm to 2 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing east late. A chance of
showers by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots becoming northwest
10 to 20 knots after midnight. Showers and a slight chance of
thunderstorms through midnight. Waves calm to 2 feet.
.THURSDAY...West winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...West winds less than 10 knots becoming east 5 to
15 knots. Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ263-272000-
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 AM EDT Tue Oct 27 2026

.REST OF TODAY...Southeast winds 10 to 20 knots increasing to
15 to 25 knots late. Rain showers. Waves 1 to 3 feet building to
2 to 4 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering southwest late.
A slight chance of showers. Waves 2 to 4 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots. A chance of showers
by mid afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots veering northwest
after midnight. Showers and a slight chance of thunderstorms
through midnight, then a slight chance of showers after midnight.
Waves building to 1 to 3 feet.
.THURSDAY...West winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots backing east. Waves calm to
2 feet.
.SATURDAY...Southeast winds 5 to 15 knots. A chance of rain
showers. Waves calm to 2 feet.

$$

LSZ264-272000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EDT Tue Oct 27 2026

.REST OF TODAY...Southeast winds 5 to 15 knots increasing to
15 to 25 knots. A slight chance of rain showers by late morning,
then rain showers by mid afternoon. Waves calm to 2 feet building
to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Southeast winds 15 to 25 knots veering south after
midnight, then becoming southwest 10 to 20 knots late. A chance
of showers. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 2 to 4 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots veering northwest
after midnight. Showers through midnight, then a chance of
showers after midnight. Waves building to 1 to 3 feet.
.THURSDAY...West winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots becoming northwest
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots backing east. Waves calm to
2 feet.
.SATURDAY...Southeast winds 5 to 15 knots veering south. A chance
of showers. Waves calm to 2 feet.

$$

LSZ265-272000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EDT Tue Oct 27 2026

.REST OF TODAY...Southeast winds 15 to 25 knots increasing to
20 to 30 knots late. A chance of showers. Waves calm to 2 feet
building to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...South winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A chance of showers through midnight.
Waves subsiding to 1 to 3 feet.
.WEDNESDAY...South winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon, then backing east late. Waves
subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 15 to 25 knots becoming west 20 to
30 knots after midnight. A slight chance of thunderstorms through
midnight. Showers. Waves building to 2 to 4 feet.
.THURSDAY...West winds 20 to 30 knots. Waves building to 3 to
5 feet occasionally to 7 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots becoming northwest
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots backing southeast. Waves calm
to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ266-272000-
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 AM EDT Tue Oct 27 2026

.REST OF TODAY...Southeast winds 10 to 20 knots increasing to
20 to 30 knots. A chance of showers. Waves calm to 2 feet
building to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Southeast winds 20 to 30 knots veering south after
midnight, then diminishing to 15 to 25 knots late. A chance of
showers through midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY...South winds 15 to 25 knots becoming southwest 10 to
20 knots in the afternoon, then backing south late. Waves
subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 15 to 25 knots becoming west 20 to
30 knots after midnight. Showers. A slight chance of
thunderstorms after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...Northwest winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Waves subsiding to 2 to 4 feet, then
building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.
.FRIDAY...Northwest winds 5 to 15 knots veering east. Waves
subsiding to calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ267-272000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EDT Tue Oct 27 2026

.REST OF TODAY...Southeast winds 10 to 20 knots increasing to
20 to 30 knots. Waves calm to 2 feet building to 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...Southeast winds 20 to 30 knots veering south after
midnight. A slight chance of showers through midnight. Waves
subsiding to 2 to 4 feet.
.WEDNESDAY...South winds 15 to 25 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 15 to 25 knots becoming southwest
20 to 30 knots after midnight. A chance of showers through
midnight, then showers and a slight chance of thunderstorms after
midnight. Waves building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...West winds 20 to 30 knots veering northwest by mid
afternoon. A slight chance of showers through early afternoon.
Waves building to 3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots. Waves subsiding
to 2 to 4 feet.
.FRIDAY...Northwest winds 5 to 15 knots. Waves subsiding to calm
to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots. Waves calm to 2 feet.

$$

LSZ261-272000-
MAFOR 2715/
Superior West 12236 11220 11320 11410 13510. Waves 3 to 5 feet
this afternoon. Waves 2 to 4 feet subsiding to 1 to 2 feet
tonight. Waves 1 to 2 feet Wednesday morning.

Superior North Central 11320 13336 11430 11420 12520. Waves 1 to
3 feet building to 2 to 4 feet this afternoon. Waves 3 to 6 feet
tonight. Waves 3 to 5 feet subsiding to 2 to 4 feet Wednesday
morning.

Superior South Central 11330 13340 11440 12430 11420. A chance of
showers this afternoon and evening. Waves 2 to 3 feet building to
3 to 5 feet this afternoon. Waves 3 to 5 feet subsiding to 2 to 4
feet tonight. Waves 2 to 4 feet subsiding to 1 to 3 feet
Wednesday morning.

Superior East 12320 12330 13430 11420. Waves 2 to 4 feet building
to 3 to 5 feet this afternoon. Waves 3 to 6 feet tonight and
Wednesday morning.

$$

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