642
FZUS63 KMQT 060801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM EDT Wed May 6 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...

30.2 inch ridging over the Canadian Prairies splits today and moves
to the Canadian Four Corners and the Southern Plains at 30.0 inches
and 30.2 inches, respectively. As this happens, expect weak high
pressure ridging of 29.9 inches to settle over Lake Superior. By
Thursday afternoon, Lake Superior is projected to be between a 29.4
inch low over Hudson Bay, a 29.4 inch low over the mouth of the St.
Lawrence River, a low of 29.7 inches over the Black Hills, a high of
30.1 inches over Oklahoma, and a weak 29.9 inch high over the
Saskatchewan/Manitoba line. The Hudson Bay and Black Hills lows work
to pass a 29.7 inch trough over Lake Superior Friday, strengthening
to 29.6 inches by Friday night into Saturday before the lows
consolidate over western Quebec by late Saturday. High pressure
ridging builds back up to 30.1 inches over Lake Superior by Sunday
as the parent high strengthens over the Canadian Prairies and
Northern Plains.


LSZ162-062000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EDT Wed May 6 2026 /301 AM CDT Wed May 6 2026/

.EARLY THIS MORNING...Northwest winds 10 to 20 knots. Waves calm
to 2 feet.
.TODAY...West winds 10 to 20 knots backing southwest late. A
chance of rain and snow showers. Waves building to 1 to 3 feet.
.TONIGHT...West winds 5 to 15 knots. Sprinkles through midnight.
Waves subsiding to calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots backing southwest in the
afternoon. 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...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. Waves calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots veering northwest. Waves
calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots veering northwest. Waves calm
to 2 feet.

$$

LSZ263-062000-
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 AM EDT Wed May 6 2026

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves 1 to
3 feet.
.TODAY...West winds 5 to 15 knots increasing to 10 to 20 knots in
the afternoon. A chance of rain and snow showers by mid
afternoon. Waves building to 2 to 4 feet.
.TONIGHT...West winds 5 to 15 knots. A chance of rain showers
through midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon. Waves building to 1 to 3 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots veering northwest. Waves
building to 1 to 3 feet.
.SUNDAY...West winds 5 to 15 knots veering northwest. Waves
subsiding to calm to 2 feet.

$$

LSZ264-062000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 AM EDT Wed May 6 2026

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves 1 to
3 feet.
.TODAY...West winds 5 to 15 knots increasing to 10 to 20 knots in
the afternoon. Sprinkles and flurries by mid afternoon. Waves
building to 2 to 4 feet.
.TONIGHT...West winds 5 to 15 knots diminishing to less than
10 knots late. Sprinkles and flurries through midnight. Waves
subsiding to calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots backing southwest in the
afternoon. A slight chance of snow showers by mid afternoon.
Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves building to 1 to 3 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots veering northwest. Waves
building to 1 to 3 feet.
.SUNDAY...West winds 5 to 15 knots veering northwest. Waves
subsiding to calm to 2 feet.

$$

LSZ265-062000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 AM EDT Wed May 6 2026

.EARLY THIS MORNING...West winds 10 to 20 knots. Waves calm to
2 feet.
.TODAY...West winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. Waves calm to 2 feet.
.TONIGHT...West winds 10 to 20 knots. Waves calm to 2 feet.
.THURSDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. Waves calm to 2 feet.
.FRIDAY...West winds 10 to 20 knots backing south by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. Waves calm to 2 feet.
.SATURDAY...West winds 15 to 25 knots veering northwest. A chance
of rain showers. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.SUNDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.

$$

LSZ266-062000-
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 AM EDT Wed May 6 2026

.EARLY THIS MORNING...West winds 10 to 20 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TODAY...West winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon, then diminishing to 10 to 20 knots late. Waves
1 to 3 feet.
.TONIGHT...West winds 5 to 15 knots increasing to 10 to 20 knots
after midnight, then diminishing to 5 to 15 knots late. Waves
subsiding to calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. Waves building to 1 to 3 feet.
.SATURDAY...West winds 10 to 20 knots becoming northwest 15 to
25 knots. A chance of rain showers. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.SUNDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ267-062000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 AM EDT Wed May 6 2026

.EARLY THIS MORNING...West winds 10 to 20 knots. Sprinkles and
flurries. Waves 2 to 4 feet.
.TODAY...West winds 10 to 20 knots. Sprinkles and flurries
through early afternoon. Waves subsiding to 1 to 3 feet.
.TONIGHT...West winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.THURSDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots late. Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots backing south
after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots veering west by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves building to 1 to 3 feet.
.SATURDAY...West winds 10 to 20 knots veering northwest. A chance
of rain showers. Waves building to 2 to 4 feet.
.SUNDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 1 to 3 feet.

$$

LSZ261-061400-
MAFOR 0609/
Superior West 11710 11610 11620 12520 12610 11600. Waves 1 to 3
feet.

Superior North Central 12720 14620 11610 11600. Waves 2 to 3 feet
today. Waves 2 to 4 feet subsiding to 1 to 2 feet tonight.

Superior South Central 12620 11610 12620 13610. Waves 1 to 2
feet.

Superior East 12610 14620 12610. Waves 2 to 4 feet.

$$

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