731
FZUS63 KMQT 242002
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
402 PM EDT Sat May 24 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...Ridging over the Upper Great Lakes at 30.3 inches
persists into Tuesday morning. A 30.0 inch low pressure lifting
through the Lower Midwest decreases the ridge strength back to 30.2
inches Tuesday and lasts into Wednesday next week. This weak 30.0
inch low then lifts northeast over the Great Lakes Wednesday night
through Thursday.


LSZ162-250800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
402 PM EDT Sat May 24 2025 /302 PM CDT Sat May 24 2025/

.LATE THIS AFTERNOON...East winds 5 to 15 knots. A slight chance
of rain showers. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots backing northeast after
midnight, then backing west late. A slight chance of rain showers
through midnight. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest in the
afternoon, then backing east late. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots backing northeast after
midnight, then backing west late. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.TUESDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots backing northwest.
Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots increasing to 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ263-250800-
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-
402 PM EDT Sat May 24 2025

.LATE THIS AFTERNOON...West winds less than 10 knots. Waves calm
to 2 feet.
.TONIGHT...West winds less than 10 knots. Waves calm to 2 feet.
.SUNDAY...West winds less than 10 knots increasing to 5 to
15 knots in the afternoon, then diminishing to less than 10 knots
late. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds less than 10 knots. Waves calm to
2 feet.
.MONDAY...Southwest winds less than 10 knots becoming northeast
5 to 15 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots diminishing to less than
10 knots after midnight. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots backing west. Waves
calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-250800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
402 PM EDT Sat May 24 2025

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...West winds 5 to 15 knots veering northwest late. A
slight chance of rain showers. Waves calm to 2 feet.
.SUNDAY...Northwest winds 5 to 15 knots backing west in the
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots diminishing to less than
10 knots after midnight. Waves calm to 2 feet.
.MONDAY...West winds less than 10 knots becoming south 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots becoming northeast less
than 10 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots backing west. Waves
calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-250800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
402 PM EDT Sat May 24 2025

.LATE THIS AFTERNOON...North winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Northwest winds 5 to 15 knots backing west after
midnight. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots becoming northwest 10 to
20 knots in the afternoon, then diminishing to 5 to 15 knots
late. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots backing east by mid afternoon.
Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots backing west. Waves
calm to 2 feet.
.THURSDAY...West winds 10 to 20 knots. Waves calm to 2 feet.

$$

LSZ266-250800-
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-
402 PM EDT Sat May 24 2025

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots. A slight chance of rain
showers. Waves calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots late. 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. Waves calm to 2 feet.
.MONDAY NIGHT...East winds less than 10 knots veering southeast
after midnight. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots backing northwest.
Waves calm to 2 feet.
.THURSDAY...West winds 10 to 20 knots. Waves building to 1 to
3 feet.

$$

LSZ267-250800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
402 PM EDT Sat May 24 2025

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...Northwest winds 10 to 20 knots. A slight chance of
rain showers after midnight. Waves calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots backing west in the
afternoon. A slight chance of rain showers through early
afternoon. Waves 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...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots backing north. Waves
calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots increasing to 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ261-250200-
MAFOR 2421/
Superior West 11100 11200 11100 13600 12500. Waves 1 foot or
less.

Superior North Central 13600 14700 11600. Waves 1 foot or less.

Superior South Central 14700 11700 12710 11700. Waves 2 feet or
less.

Superior East 13710 14700 11710. A chance of rain showers Sunday
morning. 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