216
FZUS63 KMQT 162001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Fri May 16 2025

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 low will move through Lake Superior tonight at 29.3
inches, then move into Ontario Saturday. Behind the departing low, a
30.4 inch high pressure moves over northern Manitoba, extending a
30.1 inch ridge over the lake by Sunday morning. By early Monday,
this high strengthens to 30.6 inches over far-northern Ontario and
southern Hudson Bay, with the ridge over the lake building to 30.3
inches by Monday and remaining over Lake Superior into Tuesday.


LSZ162-170800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Fri May 16 2025 /301 PM CDT Fri May 16 2025/

.LATE THIS AFTERNOON...North winds 10 to 20 knots. A chance of
showers. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots backing northwest after
midnight, then becoming west 10 to 20 knots late. A chance of
rain showers. Patchy fog after midnight. Waves calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots becoming northwest 15 to
25 knots in the afternoon, then diminishing to 10 to 20 knots
late. A slight chance of showers. Waves building to 2 to 4 feet,
then subsiding to calm to 2 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots veering northeast
late. A chance of rain showers. Waves building to 1 to 3 feet.
.SUNDAY...Northeast winds 10 to 20 knots veering east by mid
afternoon. Waves 1 to 3 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet, then
building to 1 to 3 feet.
.MONDAY...Northeast winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Waves building to 5 to 8 feet
occasionally to 10 feet.
.MONDAY NIGHT...Northeast winds 20 to 30 knots becoming east
15 to 25 knots after midnight. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...Northeast winds 20 to 30 knots. Waves building to 6 to
9 feet occasionally to 11 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots becoming north 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ263-170800-
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 Fri May 16 2025

.LATE THIS AFTERNOON...North winds 10 to 20 knots. A slight
chance of showers. Waves 1 to 3 feet.
.TONIGHT...North winds 5 to 15 knots backing northwest after
midnight. A chance of rain showers. Waves subsiding to calm to
2 feet.
.SATURDAY...West winds 10 to 20 knots becoming northwest 20 to
30 knots in the afternoon. A chance of rain showers. Waves
building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...North winds 20 to 30 knots diminishing to 10 to
20 knots. A chance of rain showers. Waves subsiding to 2 to
4 feet.
.SUNDAY...Northeast winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.SUNDAY NIGHT...North winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet,
then building to 1 to 3 feet.
.MONDAY...Northeast winds 15 to 25 knots. Waves building to 3 to
6 feet occasionally to 8 feet.
.MONDAY NIGHT...Northeast winds 15 to 25 knots veering east after
midnight. Waves subsiding to 2 to 4 feet, then building to 3 to
5 feet occasionally to 7 feet.
.TUESDAY...Northeast winds 15 to 25 knots. Waves building to 5 to
8 feet occasionally to 10 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots becoming north 5 to
15 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.

$$

LSZ264-170800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Fri May 16 2025

.LATE THIS AFTERNOON...Southeast winds 15 to 25 knots. A chance
of showers and a slight chance of thunderstorms. Waves 3 to
5 feet occasionally to 7 feet.
.TONIGHT...South winds 10 to 20 knots becoming north 5 to
15 knots after midnight. A slight chance of thunderstorms through
midnight. A chance of rain showers. Patchy fog after midnight.
Waves subsiding to calm to 2 feet.
.SATURDAY...North winds 10 to 20 knots increasing to 20 to
30 knots in the afternoon. Patchy fog through early afternoon. A
chance of rain showers. Waves building to 6 to 9 feet
occasionally to 11 feet.
.SATURDAY NIGHT...North winds 20 to 30 knots diminishing to 10 to
20 knots. A chance of rain showers. Waves subsiding to 3 to
6 feet occasionally to 8 feet.
.SUNDAY...North winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.SUNDAY NIGHT...North winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet,
then building to 2 to 4 feet.
.MONDAY...Northeast winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.MONDAY NIGHT...Northeast winds 10 to 20 knots veering east after
midnight. Waves subsiding to calm to 2 feet, then building to
3 to 5 feet occasionally to 7 feet.
.TUESDAY...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to 1 to 3 feet, then building to 3 to
5 feet occasionally to 7 feet.
.WEDNESDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.

$$

LSZ265-170800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Fri May 16 2025

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

$$

LSZ266-170800-
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 Fri May 16 2025

.LATE THIS AFTERNOON...South winds 20 to 30 knots. A chance of
showers and a slight chance of thunderstorms. Waves 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...South winds 15 to 25 knots becoming southeast 10 to
20 knots after midnight. A slight chance of thunderstorms through
midnight. A chance of rain showers. Patchy fog after midnight.
Waves subsiding to calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots increasing to 20 to
30 knots. Patchy fog. Rain showers likely through early
afternoon. A slight chance of rain showers by mid afternoon.
Waves building to 7 to 10 feet occasionally to 13 feet.
.SATURDAY NIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A chance of rain showers. Waves building
to 8 to 11 feet occasionally to 14 feet, then subsiding to 3 to
6 feet occasionally to 8 feet.
.SUNDAY...North winds 15 to 25 knots. Waves subsiding to 2 to
4 feet.
.SUNDAY NIGHT...North winds 10 to 20 knots becoming northeast
15 to 25 knots after midnight. Waves subsiding to 1 to 3 feet,
then building to 2 to 4 feet.
.MONDAY...Northeast winds 15 to 25 knots becoming north 10 to
20 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.MONDAY NIGHT...Northeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves subsiding to calm to 2 feet,
then building to 2 to 4 feet.
.TUESDAY...Northeast winds 15 to 25 knots. Waves subsiding to
1 to 3 feet, then building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...North winds 15 to 25 knots. Waves subsiding to 2 to
4 feet.

$$

LSZ267-170800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Fri May 16 2025

.LATE THIS AFTERNOON...South winds 20 to 30 knots. A chance of
showers. Waves 2 to 4 feet.
.TONIGHT...Southeast winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A chance of rain showers through
midnight. A slight chance of thunderstorms. Rain showers likely
after midnight. Patchy fog after midnight. Waves subsiding to
calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots increasing to 15 to 25 knots
late. Patchy fog. Rain showers likely through early afternoon. A
slight chance of rain showers by mid afternoon. Waves building to
2 to 4 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots veering north
after midnight. Patchy fog through midnight. A chance of rain
showers. Waves building to 5 to 8 feet occasionally to 10 feet,
then subsiding to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to 2 to 4 feet.
.SUNDAY NIGHT...North winds 10 to 20 knots becoming northeast
15 to 25 knots after midnight. Waves 2 to 4 feet.
.MONDAY...Northeast winds 15 to 25 knots becoming north 10 to
20 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.MONDAY NIGHT...Northeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves building to 2 to 4 feet.
.TUESDAY...North winds 15 to 25 knots veering northeast. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.WEDNESDAY...North winds 15 to 25 knots. Waves 2 to 4 feet.

$$

LSZ261-170200-
MAFOR 1621/
Superior West 11810 12100 11700 11610 11620 12720. A chance of
showers. Waves 2 feet or less tonight. Waves 1 to 3 feet
Saturday.

Superior North Central 11330 11420 11210 12800 11710 11730 11840.
A chance of showers Saturday. Waves 3 to 5 feet subsiding to 1 to
3 feet tonight. Waves 1 to 3 feet building to 5 to 8 feet
Saturday.

Superior South Central 11440 11430 11420 11300 11710 11726 11720
11730. A chance of thunderstorms this evening. Waves 3 to 5 feet
subsiding to 1 to 3 feet tonight. Waves 1 to 2 feet building to 4
to 7 feet Saturday.

Superior East 12430 11326 11316 12216 11700 11710. Waves 3 to 5
feet subsiding to 2 to 4 feet tonight. Waves 1 to 2 feet
Saturday.

$$

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