191
FZUS63 KMQT 080203
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1002 PM EDT Thu May 7 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 troughing of around 29.8 inches remains over the lake until
Friday morning associated with a pair of 29.4 inch lows (one over
Labrador and one over Hudson Bay). The Hudson low drops a 29.6 inch
trough over western Lake Superior Friday evening, passing over the
rest of the lake overnight into Saturday morning. By Saturday
evening, Lake Superior will be situated between a 29.5 inch low over
western Quebec and a 30.2 inch high over Saskatchewan. By Sunday
afternoon, the low will shift into central Quebec while the high
moves over Lake Winnipeg. For Monday afternoon, the high builds to
30.3 inches and resides over Lake Superior. Meanwhile, Monday
evening, a 29.7 inch low develops over the Northern Plains. This low
passes through or near the Upper Great Lakes by Tuesday afternoon as
the 30.1 inch high shifts east.


LSZ162-080800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1002 PM EDT Thu May 7 2026 /902 PM CDT Thu May 7 2026/

.REST OF TONIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...Southwest winds 5 to 15 knots. A chance of rain showers
by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots backing west after
midnight, then becoming northwest 10 to 20 knots late. A chance
of rain showers. Waves calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. A slight chance of rain showers
through early afternoon, then sprinkles by mid afternoon. Waves
calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots. Waves calm to
2 feet.
.SUNDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots backing east. Waves calm
to 2 feet.
.TUESDAY...East winds 5 to 15 knots backing north. A chance of
rain showers. Waves calm to 2 feet.

$$

LSZ263-080800-
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-
1002 PM EDT Thu May 7 2026

.REST OF TONIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...Southwest winds 5 to 15 knots. A chance of rain showers
by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots veering northwest
late. A chance of rain showers. Waves calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. A chance of rain showers. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots veering northwest
after midnight. Waves building to 1 to 3 feet.
.SUNDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.MONDAY...North winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.
.TUESDAY...East winds 5 to 15 knots backing northeast. A chance
of rain showers. Waves calm to 2 feet.

$$

LSZ264-080800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1002 PM EDT Thu May 7 2026

.REST OF TONIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...Southwest winds 5 to 15 knots. A chance of rain showers
by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight, then veering northwest late. A chance of rain showers.
Flurries after midnight. Waves calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots backing west by mid
afternoon. A slight chance of rain showers, possibly mixed with
snow through early afternoon, then sprinkles and flurries by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots veering northwest
after midnight. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.SUNDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.MONDAY...North winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots backing east. Waves calm
to 2 feet.

$$

LSZ265-080800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1002 PM EDT Thu May 7 2026

.REST OF TONIGHT...South winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots veering west in the
afternoon, then backing south late. A chance of rain showers by
mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then veering west late. A chance of rain
showers. Waves calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots. A chance of rain
showers. A slight chance of snow showers by mid afternoon. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves building to 1 to 3 feet.
.SUNDAY...Northwest winds 15 to 25 knots. Waves 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...North winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots backing east. A chance
of rain showers. Waves building to 2 to 4 feet, then subsiding to
calm to 2 feet.

$$

LSZ266-080800-
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-
1002 PM EDT Thu May 7 2026

.REST OF TONIGHT...Southwest winds 10 to 20 knots. Waves calm to
2 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing south late.
Sprinkles by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then veering west late. A chance of rain
showers. Flurries after midnight. Waves calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots. A chance of rain
showers, possibly mixed with snow. Waves building to 2 to 4 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots. Waves building
to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.SUNDAY...Northwest winds 15 to 25 knots. Waves 2 to 4 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots backing south. Waves calm
to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots backing east. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ267-080800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1002 PM EDT Thu May 7 2026

.REST OF TONIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing south in the
afternoon, then veering southwest late. Sprinkles by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A chance of rain showers. Waves calm to
2 feet.
.SATURDAY...Northwest winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. A chance of rain showers. A chance of
snow showers by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY NIGHT...Northwest winds 20 to 30 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.
.SUNDAY...Northwest winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves subsiding to 1 to 3 feet, then
building to 2 to 4 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots backing east. Waves calm
to 2 feet.

$$

LSZ261-080800-
MAFOR 0803/
Superior West 12500 11510 11610 13510 11600. Waves 2 feet or
less.

Superior North Central 13500 11510 11520 12510 11410. A chance of
rain showers Friday evening. Waves 1 to 2 feet.

Superior South Central 15500 11300 11410. A chance of showers
Friday evening. Waves 2 feet or less.

Superior East 11500 12510 13500 11400 11410. A chance of rain
showers Friday evening. Waves 1 to 2 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