356
FZUS63 KMQT 172002
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Sun May 17 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...

Ridging of 30.1 inches shifts east into Quebec tonight as a 29.2
inch low moves out of Colorado. This low will weaken to 29.7 inches
as it reaches Lake Superior late tonight. Another low pressure will
follow it, reaching Lake Superior by Tuesday morning at 29.7 inches.
Thereafter, a 30.1 inch high will build into the midwest Tuesday
night, strengthening to 30.4 inches over Lake Superior Wednesday
night. The high pressure will shift east on Thursday with weaker
ridging of 30.1 inches over the lake continuing into at least
Friday morning.


LSZ162-180800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Sun May 17 2026 /301 PM CDT Sun May 17 2026/

...GALE WARNING IN EFFECT UNTIL 11 PM EDT /10 PM CDT/ THIS
EVENING...

.LATE THIS AFTERNOON...Northeast gales to 35 knots. Waves 6 to
9 feet occasionally to 11 feet building to 7 to 10 feet
occasionally to 13 feet.
.TONIGHT...Northeast gales to 35 knots diminishing to 15 to
25 knots. A chance of rain showers through midnight. A chance of
thunderstorms. Rain showers likely after midnight. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.MONDAY...North winds 10 to 20 knots becoming northeast 5 to
15 knots in the afternoon, then increasing to 10 to 20 knots
late. A slight chance of rain showers. Waves subsiding to 2 to
4 feet.
.MONDAY NIGHT...Northeast winds 15 to 25 knots increasing to
20 to 30 knots after midnight. A chance of rain showers and a
slight chance of thunderstorms through midnight, then rain
showers after midnight. Waves building to 7 to 10 feet
occasionally to 13 feet.
.TUESDAY...North winds 20 to 30 knots becoming west 10 to
20 knots by mid afternoon. Rain showers likely through early
afternoon. Waves subsiding to 2 to 4 feet.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots. Waves subsiding
to calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots veering south. Waves calm to
2 feet.
.FRIDAY...South winds 5 to 15 knots backing east. Waves calm to
2 feet.

$$

LSZ263-180800-
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 Sun May 17 2026

.LATE THIS AFTERNOON...Northeast winds to 30 knots with a few
gale force gusts to 35 knots possible. A slight chance of showers
and thunderstorms. Waves 5 to 9 feet occasionally to 11 feet,
then subsiding to 5 to 8 feet occasionally to 10 feet.
.TONIGHT...East winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A chance of rain showers through
midnight. A chance of thunderstorms. Rain showers likely after
midnight. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.MONDAY...North winds 10 to 20 knots veering northeast late. A
chance of rain showers. Waves subsiding to 2 to 4 feet.
.MONDAY NIGHT...Northeast winds 15 to 25 knots increasing to
20 to 30 knots after midnight. A chance of rain showers through
midnight. A slight chance of thunderstorms. Rain showers after
midnight. Waves building to 7 to 10 feet occasionally to 13 feet.
.TUESDAY...North winds 20 to 30 knots becoming northwest 15 to
25 knots by mid afternoon. Rain showers likely through early
afternoon. Waves building to 8 to 11 feet occasionally to
14 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots becoming southwest
10 to 20 knots by mid afternoon. Waves subsiding to calm to
2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots. Waves building to
1 to 3 feet, then subsiding to calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots increasing to 10 to
20 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.FRIDAY...South winds 5 to 15 knots backing southeast. Waves calm
to 2 feet.

$$

LSZ264-180800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Sun May 17 2026

.LATE THIS AFTERNOON...Northeast winds 10 to 20 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TONIGHT...East winds 15 to 25 knots. A chance of rain showers
through midnight. A chance of thunderstorms. Rain showers likely
after midnight. Waves building to 3 to 6 feet occasionally to
8 feet.
.MONDAY...East winds 10 to 20 knots becoming north 5 to 15 knots
in the afternoon, then increasing to 10 to 20 knots late. A
chance of rain showers. Waves subsiding to 2 to 4 feet.
.MONDAY NIGHT...Northeast winds 15 to 25 knots increasing to
20 to 30 knots after midnight. A chance of rain showers through
midnight. A slight chance of thunderstorms. Rain showers after
midnight. Waves building to 7 to 10 feet occasionally to 13 feet.
.TUESDAY...North winds 20 to 30 knots backing northwest by mid
afternoon. Rain showers through early afternoon. Waves subsiding
to 5 to 8 feet occasionally to 10 feet.
.TUESDAY NIGHT...North winds 15 to 25 knots becoming northwest
10 to 20 knots after midnight. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots becoming southwest
5 to 15 knots by mid afternoon. Waves subsiding to calm to
2 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots backing south
after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots increasing to 10 to
20 knots. Waves building to 1 to 3 feet.
.FRIDAY...Southeast winds 5 to 15 knots. Waves subsiding to calm
to 2 feet.

$$

LSZ265-180800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Sun May 17 2026

.LATE THIS AFTERNOON...East winds 10 to 20 knots. A chance of
rain showers. Waves 1 to 3 feet.
.TONIGHT...East winds 15 to 25 knots veering southeast late. A
chance of rain showers through midnight. A chance of
thunderstorms. Rain showers likely after midnight. Waves building
to 3 to 6 feet occasionally to 8 feet.
.MONDAY...Southeast winds 10 to 20 knots veering northwest in the
afternoon, then becoming north 15 to 25 knots late. A chance of
showers. A slight chance of thunderstorms by mid afternoon. Waves
subsiding to 1 to 3 feet.
.MONDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. A chance of rain showers through midnight. A
slight chance of thunderstorms. Rain showers after midnight.
Waves building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...Northwest winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. Rain showers and a slight chance of
thunderstorms through early afternoon. Waves building to 6 to
10 feet occasionally to 13 feet.
.TUESDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots becoming north 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.THURSDAY...Southeast winds 10 to 20 knots becoming south 15 to
25 knots. Waves building to 1 to 3 feet.
.FRIDAY...Southeast winds 10 to 20 knots veering south. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.

$$

LSZ266-180800-
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 Sun May 17 2026

.LATE THIS AFTERNOON...Northeast winds 10 to 20 knots. A chance
of rain showers. Waves 2 to 4 feet.
.TONIGHT...East winds 15 to 25 knots increasing to 20 to 30 knots
after midnight, then veering southeast late. A chance of rain
showers through midnight. A chance of thunderstorms. Rain showers
likely after midnight. Waves building to 4 to 7 feet occasionally
to 9 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.
.MONDAY...South winds 10 to 20 knots backing north late. A chance
of showers and a slight chance of thunderstorms. Waves subsiding
to 2 to 4 feet, then building to 3 to 5 feet occasionally to
7 feet.
.MONDAY NIGHT...North winds 15 to 25 knots veering northeast
after midnight, then becoming east 20 to 30 knots late. A chance
of rain showers through midnight. A slight chance of
thunderstorms. Rain showers after midnight. Waves building to
5 to 8 feet occasionally to 10 feet.
.TUESDAY...North winds 20 to 30 knots becoming northwest gales to
35 knots by mid afternoon. Rain showers through early afternoon.
A slight chance of thunderstorms. A slight chance of rain showers
by mid afternoon. Waves building to 8 to 11 feet occasionally to
14 feet.
.TUESDAY NIGHT...Northwest winds 20 to 30 knots. Waves subsiding
to 6 to 9 feet occasionally to 11 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. Waves building to 1 to 3 feet.
.FRIDAY...Southeast winds 15 to 25 knots becoming south 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ267-180800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Sun May 17 2026

.LATE THIS AFTERNOON...Northeast winds 10 to 20 knots. A slight
chance of showers. Waves calm to 2 feet.
.TONIGHT...East winds 15 to 25 knots increasing to 20 to 30 knots
after midnight, then veering southeast late. Rain showers likely
and a chance of thunderstorms. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.MONDAY...Southeast winds 15 to 25 knots becoming south 10 to
20 knots in the afternoon, then veering northwest late. Showers
likely through early afternoon. A slight chance of thunderstorms.
A chance of showers by mid afternoon. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots becoming northeast 10 to
20 knots after midnight, then becoming southeast 15 to 25 knots
late. A chance of rain showers through midnight. A slight chance
of thunderstorms. Rain showers likely after midnight. Waves
building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...South winds 20 to 30 knots becoming west gales to
35 knots by mid afternoon. Rain showers through early afternoon.
A slight chance of thunderstorms. A slight chance of rain showers
by mid afternoon. Waves building to 8 to 11 feet occasionally to
14 feet.
.TUESDAY NIGHT...Northwest gales to 35 knots diminishing to 20 to
30 knots after midnight. Waves subsiding to 7 to 10 feet
occasionally to 13 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots. Waves calm to 2 feet.

$$

LSZ261-180200-
MAFOR 1721/
Superior West...GALE WARNING IN EFFECT...11150 12140 11136 11126
12120 11110. A chance of thunderstorms tonight and Monday
morning. Waves 6 to 10 feet subsiding to 5 to 8 feet tonight.
Waves 3 to 6 feet Monday.

Superior North Central 11120 11220 13236 11310 12820. A chance of
thunderstorms overnight and Monday morning. Waves 1 to 3 feet
building to 3 to 6 feet tonight. Waves 3 to 6 feet Monday.

Superior South Central 11220 11230 11236 11346 11336 11320 11520
11720. A chance of thunderstorms tonight and Monday morning.
Waves 2 to 4 feet building to 3 to 6 feet tonight. Waves 3 to 6
feet subsiding to 2 to 3 feet Monday.

Superior East 11120 11230 12246 12336 11420 11510. A chance of
thunderstorms tonight and Monday morning. Waves 1 to 3 feet
building to 4 to 7 feet tonight. Waves 4 to 7 feet subsiding to 2
to 4 feet Monday.

$$

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