691
FZUS63 KMQT 240201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 PM EDT Thu Jul 23 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...

Weak 29.9 inch troughing moves over the northwest half of Lake
Superior Friday as 30.1 inch high pressure over Lower Michigan
shifts east towards Lake Ontario. Expect troughing to deepen to 29.8
inches over the lake through Saturday as a 29.3 inch low tracks
across Hudson Bay Friday night. Weak ridging of around 29.9 inches
develops over the lake Saturday night. A 29.5 inch Clipper low moves
into the Upper Great Lakes or Upper Midwest by Monday.



LSZ162-240800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Thu Jul 23 2026 /901 PM CDT Thu Jul 23 2026/

.REST OF TONIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight, then diminishing to 10 to 20 knots
late. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.FRIDAY...Southwest winds 10 to 20 knots. Waves subsiding to calm
to 2 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots increasing to
20 to 30 knots after midnight. A chance of showers and
thunderstorms. Waves building to 3 to 5 feet occasionally to
7 feet.
.SATURDAY...Southwest winds 15 to 25 knots diminishing to 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots veering northeast
after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots. A chance of
showers and thunderstorms. Waves calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots backing north. Waves calm
to 2 feet.
.TUESDAY...East winds 5 to 15 knots backing northeast. Waves calm
to 2 feet.

$$

LSZ263-240800-
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 Thu Jul 23 2026

.REST OF TONIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves 3 to 5 feet occasionally to
7 feet subsiding to 2 to 4 feet.
.FRIDAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots late. Waves subsiding to 1 to 3 feet.
.FRIDAY NIGHT...South winds 20 to 30 knots veering southwest
after midnight. A chance of showers. A chance of thunderstorms
after midnight. Waves building to 3 to 6 feet occasionally to
8 feet.
.SATURDAY...Southwest winds 20 to 30 knots diminishing to 10 to
20 knots by mid afternoon. A slight chance of showers and
thunderstorms through early afternoon. Waves subsiding to calm to
2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots backing northeast
after midnight. Waves calm to 2 feet.
.SUNDAY...East winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots backing northeast after
midnight. A chance of showers and thunderstorms. Waves calm to
2 feet.
.MONDAY...Northeast winds 5 to 15 knots backing north. Waves calm
to 2 feet.
.TUESDAY...North winds 5 to 15 knots becoming east less than
10 knots. Waves calm to 2 feet.

$$

LSZ264-240800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 PM EDT Thu Jul 23 2026

.REST OF TONIGHT...Southwest winds 10 to 20 knots. Waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet.
.FRIDAY...Southwest winds 10 to 20 knots backing south late.
Waves subsiding to 1 to 3 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots veering southwest
late. A chance of showers and thunderstorms after midnight. Waves
building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...Southwest winds 20 to 30 knots becoming west 10 to
20 knots by mid afternoon. A chance of showers and a slight
chance of thunderstorms through early afternoon. Waves subsiding
to 1 to 3 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Southeast winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots backing northeast
after midnight. A chance of showers. Waves calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots backing north. A chance
of showers and thunderstorms. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots becoming west less than
10 knots. Waves calm to 2 feet.

$$

LSZ265-240800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EDT Thu Jul 23 2026

.REST OF TONIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots backing southeast late.
Waves building to 1 to 3 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots after midnight, then veering southwest late. A chance of
showers and a slight chance of thunderstorms after midnight.
Waves building to 2 to 4 feet.
.SATURDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots by mid afternoon. A chance of showers and a slight
chance of thunderstorms. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. A chance of showers by mid afternoon.
Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 10 to 20 knots. A chance of
showers. Waves calm to 2 feet.
.MONDAY...Northeast winds 10 to 20 knots backing north. A chance
of showers and thunderstorms. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots backing west. Waves calm to
2 feet.

$$

LSZ266-240800-
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 Thu Jul 23 2026

.REST OF TONIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots late. Waves 3 to 5 feet occasionally to 7 feet
subsiding to 2 to 4 feet.
.FRIDAY...Southwest winds 10 to 20 knots backing south in the
afternoon, then increasing to 20 to 30 knots late. Waves
subsiding to calm to 2 feet, then building to 2 to 4 feet.
.FRIDAY NIGHT...South winds 20 to 30 knots. A chance of showers
and a slight chance of thunderstorms after midnight. Waves
building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...Southwest winds 15 to 25 knots becoming west 5 to
15 knots by mid afternoon. Showers through early afternoon. A
slight chance of thunderstorms. A chance of showers by mid
afternoon. Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots. A slight chance of
showers through midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots. A chance of showers by
mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A chance of showers. Waves calm to 2 feet.
.MONDAY...North winds 10 to 20 knots. A chance of thunderstorms.
A chance of showers. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots backing northwest. Waves
calm to 2 feet.

$$

LSZ267-240800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EDT Thu Jul 23 2026

.REST OF TONIGHT...Southwest winds 10 to 20 knots. Waves 1 to
3 feet subsiding to calm to 2 feet, then building to 1 to 3 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing south in the
afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots late. A chance of showers after midnight. Waves building
to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...South winds 15 to 25 knots becoming west 5 to
15 knots by mid afternoon. Showers through early afternoon. A
slight chance of thunderstorms. A chance of showers by mid
afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots veering northwest
after midnight. A slight chance of showers through midnight.
Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. A chance of showers by mid afternoon. Waves calm to
2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. A chance of showers and thunderstorms. Waves calm to
2 feet.
.MONDAY...Northwest winds 10 to 20 knots. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.TUESDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ261-240800-
MAFOR 2403/
Superior West 12530 13520 11510 11520 11530. Waves 1 to 3 feet.

Superior North Central 11520 12530 13520 12420. Waves 3 to 5 feet
subsiding to 2 to 4 feet overnight. Waves 2 to 4 feet subsiding
to 1 to 3 feet Friday. Waves 1 to 3 feet Friday evening.

Superior South Central 14520 11410 11320 11430 11440. Waves 1 to
3 feet overnight and Friday. Waves 3 to 5 feet Friday evening.

Superior East 11510 11520 13510 11410 11430 11440. Waves 1 to 3
feet overnight and Friday. Waves 2 to 4 feet building to 3 to 5
feet Friday evening.

$$

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