608
FZUS63 KMQT 092002
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Sat May 9 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 29.4 inch low east of Lake Superior makes it to Quebec this
evening. Behind the low, ridging progressively builds over the lake
as a 30.2 inch high pressure over the Canadian Prairies builds
towards the Great Lakes this weekend. The high shifts southeast into
the western Great Lakes at 30.3 inches Sunday night into Monday.
Ridging from the high persists at around 30.2 inches over Lake
Superior through Monday evening. The ridging is eventually replaced
by a 29.7 inch Clipper descending over western Lake Superior on
Tuesday as the previous high pressure weakens and shifts to the East
Coast. As the Clipper continues towards the eastern Great Lakes
Tuesday night into Wednesday, 30.1 inch high pressure ridging moves
over Lake Superior. This high pressure is pressed southeast to the
Lower Great Lakes on Thursday while a 29.4 inch low emanates off the
Northern Rockies.


LSZ162-100800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Sat May 9 2026 /301 PM CDT Sat May 9 2026/

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Waves calm
to 2 feet.
.TONIGHT...Northwest winds 10 to 20 knots. Waves calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing west late. Waves calm to
2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots veering north after
midnight, then diminishing to less than 10 knots late. Waves calm
to 2 feet.
.MONDAY...Southeast winds less than 10 knots increasing to 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. A chance of rain showers after midnight.
Waves calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots backing north by mid
afternoon. Rain showers. Waves building to 2 to 4 feet.
.TUESDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots becoming south 10 to
20 knots. A chance of rain showers. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.

$$

LSZ263-100800-
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-
401 PM EDT Sat May 9 2026

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Waves 1 to
3 feet.
.TONIGHT...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves 1 to 3 feet.
.SUNDAY...Northwest winds 5 to 15 knots backing west in the
afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots veering north after
midnight, then diminishing to less than 10 knots late. Waves calm
to 2 feet.
.MONDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots. A chance of rain
showers after midnight. Waves building to 1 to 3 feet.
.TUESDAY...Southeast winds 10 to 20 knots. Rain showers. Waves
building to 2 to 4 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots. Waves subsiding to
1 to 3 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves subsiding to calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots increasing to 10 to
20 knots. A chance of rain showers. Waves building to 1 to
3 feet.

$$

LSZ264-100800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Sat May 9 2026

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Waves 1 to
3 feet.
.TONIGHT...Northwest winds 5 to 15 knots. Waves 1 to 3 feet.
.SUNDAY...Northwest winds 5 to 15 knots backing west late. Waves
subsiding to calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots veering north late.
Waves calm to 2 feet.
.MONDAY...Northwest winds less than 10 knots becoming south 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots becoming southeast
10 to 20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 20 to 30 knots. Rain showers likely.
Waves building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...Northeast winds 15 to 25 knots becoming north
10 to 20 knots after midnight. A chance of rain showers. Waves
subsiding to 1 to 3 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots becoming west 5 to
15 knots. Waves subsiding to calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots increasing to 10 to
20 knots. A chance of rain showers. Waves building to 2 to
4 feet.

$$

LSZ265-100800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Sat May 9 2026

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TONIGHT...West winds 15 to 25 knots veering northwest after
midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves building to 1 to 3 feet.
.TUESDAY...Southeast winds 20 to 30 knots. Rain showers likely.
Waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...Southeast winds 15 to 25 knots becoming north
20 to 30 knots after midnight. A chance of rain showers. Waves
subsiding to 1 to 3 feet.
.WEDNESDAY...Northwest gales to 35 knots becoming west 10 to
20 knots. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.
.THURSDAY...Southeast winds 10 to 20 knots becoming south 20 to
30 knots. A chance of rain showers. Waves building to 2 to
4 feet.

$$

LSZ266-100800-
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-
401 PM EDT Sat May 9 2026

.LATE THIS AFTERNOON...Northwest winds 20 to 30 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 2 to 4 feet.
.SUNDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots late. Waves 2 to 4 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots. Waves subsiding
to 1 to 3 feet.
.MONDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves building to 1 to 3 feet.
.TUESDAY...South winds 20 to 30 knots backing southeast by mid
afternoon. A chance of rain showers through early afternoon, then
rain showers likely by mid afternoon. Waves building to 4 to
7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY NIGHT...Southeast winds 15 to 25 knots becoming north
20 to 30 knots after midnight. A chance of rain showers. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.WEDNESDAY...Northwest gales to 35 knots diminishing to 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to calm to 2 feet.
.THURSDAY...Southeast winds 10 to 20 knots becoming south 15 to
25 knots. Waves building to 2 to 4 feet.

$$

LSZ267-100800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Sat May 9 2026

.LATE THIS AFTERNOON...Northwest winds to 30 knots with a few
gale force gusts to 35 knots possible. Waves 3 to 6 feet
occasionally to 8 feet building to 4 to 7 feet occasionally to
9 feet.
.TONIGHT...Northwest winds to 30 knots with a few gale force
gusts to 35 knots possible diminishing to 15 to 25 knots after
midnight. Waves subsiding to 2 to 4 feet.
.SUNDAY...Northwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
5 to 15 knots. Waves subsiding to 1 to 3 feet.
.MONDAY...Northwest winds 5 to 15 knots. Waves subsiding to calm
to 2 feet.
.MONDAY NIGHT...South winds less than 10 knots becoming southeast
5 to 15 knots after midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Rain showers likely by mid afternoon.
Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.TUESDAY NIGHT...Southeast winds 15 to 25 knots becoming north
10 to 20 knots after midnight. A chance of rain showers. Waves
subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.THURSDAY...West winds 5 to 15 knots becoming south 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ261-100200-
MAFOR 0921/
Superior West 11620 12720 14710 11610. Waves 2 feet or less.

Superior North Central 12720 11710 13720 11710 11610. Waves 1 to
3 feet.

Superior South Central 11730 15720 11720. Waves 2 to 4 feet
tonight. Waves 1 to 3 feet Sunday.

Superior East 12740 11730 14720 11720. Waves 3 to 5 feet building
to 4 to 7 feet, then subsiding to 3 to 5 feet tonight. Waves 2 to
4 feet Sunday.

$$

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