510
FZUS63 KMQT 222001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Thu May 22 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 30.1 inch ridge persists over Lake Superior this
afternoon as a 29.7 inch low is located over Lake Ontario. This low
dwindles to 29.8 inches by Friday as it phases with another low
moving into Maine. In response, ridging over Lake Superior increases
to 30.3 inches by Saturday and remains near that strength through
the rest of the weekend into Tuesday night next week.


LSZ162-230800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Thu May 22 2025 /301 PM CDT Thu May 22 2025/

.LATE THIS AFTERNOON...East winds 5 to 15 knots. A slight chance
of rain showers. Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots backing north after
midnight. Sprinkles. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots backing southwest in the
afternoon. Sprinkles. Waves calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. Waves calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots veering south by mid
afternoon. A slight chance of rain showers by mid afternoon.
Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots backing north after
midnight. Waves calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots backing north after
midnight. Waves calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots backing north. Waves
calm to 2 feet.

$$

LSZ263-230800-
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 Thu May 22 2025

.LATE THIS AFTERNOON...North winds 10 to 20 knots. A slight
chance of rain showers. Waves calm to 2 feet.
.TONIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots late. A slight chance of rain showers. Waves building to
1 to 3 feet, then subsiding to calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots backing northwest late.
Sprinkles. Waves calm to 2 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots veering north late.
Sprinkles through midnight. Waves calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds less than 10 knots veering northwest
after midnight. Waves calm to 2 feet.
.SUNDAY...Northwest winds 5 to 15 knots veering north by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds less than 10 knots. Waves calm to
2 feet.
.MONDAY...Northeast winds 5 to 15 knots veering east. Waves calm
to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots backing west. Waves calm
to 2 feet.

$$

LSZ264-230800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Thu May 22 2025

.LATE THIS AFTERNOON...North winds 10 to 20 knots. A slight
chance of rain showers. Waves 1 to 3 feet.
.TONIGHT...North winds 10 to 20 knots. A slight chance of rain
showers. Waves building to 2 to 4 feet.
.FRIDAY...North winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. Sprinkles. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots. Sprinkles. Waves calm
to 2 feet.
.SATURDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds less than 10 knots. Waves calm
to 2 feet.
.SUNDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds less than 10 knots. Waves calm to
2 feet.
.MONDAY...Northwest winds 5 to 15 knots becoming east less than
10 knots. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots backing west. Waves calm
to 2 feet.

$$

LSZ265-230800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Thu May 22 2025

.LATE THIS AFTERNOON...North winds 15 to 25 knots. A slight
chance of rain showers. Waves 2 to 4 feet.
.TONIGHT...North winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A slight chance of rain showers. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.FRIDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots late. A slight chance of rain showers. Waves building to
3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots late. Sprinkles. Waves subsiding to calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...Northwest winds 5 to 15 knots becoming north 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots backing west after
midnight. Waves calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots veering east. Waves calm
to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots backing west. Waves calm
to 2 feet.

$$

LSZ266-230800-
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 Thu May 22 2025

.LATE THIS AFTERNOON...North winds 15 to 25 knots. A slight
chance of rain showers. Waves 2 to 4 feet building to 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...North winds 15 to 25 knots. A chance of rain showers.
Waves subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots late. A slight chance of rain showers. Waves building to
3 to 6 feet occasionally to 8 feet, then subsiding to 2 to
4 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots. A slight chance of
rain showers. Waves subsiding to calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots. A slight chance of
rain showers through early afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...Northwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...Northwest winds 5 to 15 knots veering north. Waves calm
to 2 feet.
.TUESDAY...North winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ267-230800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Thu May 22 2025

.LATE THIS AFTERNOON...North winds 15 to 25 knots. A slight
chance of rain showers. Waves 2 to 4 feet.
.TONIGHT...North winds 15 to 25 knots. A chance of rain showers.
Waves 2 to 4 feet.
.FRIDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots late. A chance of rain showers. Waves 2 to 4 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots. A chance of rain
showers. Waves subsiding to calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots. A slight chance of
rain showers. 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. Waves calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...Northwest winds 5 to 15 knots veering north. Waves calm
to 2 feet.
.TUESDAY...North winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ261-230200-
MAFOR 2221/
Superior West 11300 12800 11810 12800 11700 11500. A chance of
rain showers early this evening. Waves 2 feet or less.

Superior North Central 15820 11820 11810. Waves 2 to 4 feet.

Superior South Central 14820 11820 11720 11820 11720. A chance of
rain showers Friday morning. Waves 2 to 4 feet tonight. Waves 3
to 5 feet subsiding to 2 to 4 feet Friday.

Superior East 11830 15820 11820. A chance of rain showers
overnight and Friday morning. Waves 3 to 5 feet subsiding to 2 to
4 feet tonight. Waves 2 to 4 feet Friday.

$$

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