672
FZUS63 KMQT 160802
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
402 AM EDT Wed Jul 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...

This morning, a 29.9 inch trough remains over far eastern Lake
Superior. This afternoon through Thursday morning, a 29.8 inch low
will quickly eject from the Central Plains across Lakes Michigan and
Huron. By Thursday afternoon, Lake Superior will be between a 29.6
inch low over Quebec and a 30.1 inch high over Minnesota. This high
expands over the Uppper Great Lakes Friday, shifting east to New
England by Saturday morning. Another 30.1 inch high will slowly
build over the Upper Great Lakes by Sunday afternoon, remaining
over the Great Lakes through Monday.


LSZ162-162000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
402 AM EDT Wed Jul 16 2025 /302 AM CDT Wed Jul 16 2025/

.EARLY THIS MORNING...Northeast winds 10 to 20 knots. A chance of
showers. Waves 2 to 4 feet.
.TODAY...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots late. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.TONIGHT...North winds 10 to 20 knots becoming northwest 5 to
15 knots after midnight, then veering north late. A slight chance
of showers. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing southwest in the
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots backing north after
midnight. Showers likely through midnight. A chance of
thunderstorms. A chance of showers after midnight. Waves calm to
2 feet.
.SATURDAY...Northeast winds 5 to 15 knots backing west. Waves
calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ263-162000-
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 AM EDT Wed Jul 16 2025

.EARLY THIS MORNING...Northeast winds 10 to 20 knots. A chance of
showers. Waves 2 to 4 feet.
.TODAY...Northeast winds 15 to 25 knots. A chance of showers.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.
.TONIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A chance of showers. Waves subsiding to
calm to 2 feet.
.THURSDAY...Northwest winds 5 to 15 knots backing southwest late.
Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots. A chance of
showers. Waves calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots backing west. Waves calm to
2 feet.
.SUNDAY...Northeast winds 5 to 15 knots veering east. Waves calm
to 2 feet.

$$

LSZ264-162000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
402 AM EDT Wed Jul 16 2025

.EARLY THIS MORNING...North winds 10 to 20 knots. A slight chance
of showers. Waves 2 to 4 feet.
.TODAY...North winds 10 to 20 knots veering northeast in the
afternoon, then diminishing to 5 to 15 knots late. A chance of
showers. Waves subsiding to 1 to 3 feet.
.TONIGHT...North winds 5 to 15 knots. A chance of showers. Waves
subsiding to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing west in the
afternoon, then backing southwest late. Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots. A chance of
showers. Waves calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing southeast. Waves calm
to 2 feet.

$$

LSZ265-162000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
402 AM EDT Wed Jul 16 2025

.EARLY THIS MORNING...North winds 15 to 25 knots. A chance of
showers. Waves calm to 2 feet building to 1 to 3 feet.
.TODAY...North winds 15 to 25 knots veering northeast in the
afternoon, then diminishing to 10 to 20 knots late. A chance of
showers. A slight chance of thunderstorms by mid afternoon. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.TONIGHT...Northeast winds 10 to 20 knots backing north after
midnight. A chance of showers. Waves 1 to 3 feet.
.THURSDAY...North winds 10 to 20 knots backing west late. Waves
subsiding to calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. A chance of showers. Waves calm to 2 feet.
.SATURDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.

$$

LSZ266-162000-
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 AM EDT Wed Jul 16 2025

.EARLY THIS MORNING...North winds 10 to 20 knots. A chance of
showers. Waves 2 to 4 feet.
.TODAY...North winds 10 to 20 knots. A chance of showers. A
slight chance of thunderstorms by mid afternoon. Waves 2 to
4 feet.
.TONIGHT...North winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A chance of showers. Waves 2 to 4 feet.
.THURSDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots in the afternoon, then backing west late. Waves
subsiding to calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots. A chance of showers
after midnight. Waves calm to 2 feet.
.SATURDAY...South winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.

$$

LSZ267-162000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
402 AM EDT Wed Jul 16 2025

.EARLY THIS MORNING...North winds 5 to 15 knots. A chance of
showers and a slight chance of thunderstorms. Waves calm to
2 feet.
.TODAY...North winds 10 to 20 knots. A slight chance of showers
and thunderstorms. Waves building to 2 to 4 feet.
.TONIGHT...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then becoming north 15 to 25 knots late.
A slight chance of thunderstorms through midnight. A chance of
showers. Waves 2 to 4 feet.
.THURSDAY...North winds 15 to 25 knots backing northwest in the
afternoon, then diminishing to 10 to 20 knots late. A slight
chance of showers through early afternoon. Waves subsiding to
1 to 3 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots becoming southwest
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...South winds 10 to 20 knots veering northwest. Waves
calm to 2 feet.
.SUNDAY...North winds 10 to 20 knots becoming east 5 to 15 knots.
Waves calm to 2 feet.

$$

LSZ261-161400-
MAFOR 1609/
Superior West 11120 11130 11136 11130 11220 11810 11710 11700.
Waves 2 to 4 feet today. Waves 2 to 4 feet subsiding to 1 to 3
feet tonight.

Superior North Central 12820 11120 12110 12800 11810. A chance of
showers this afternoon and overnight. Waves 2 to 4 feet today.
Waves 1 to 3 feet tonight.

Superior South Central 14820 11110 11120 12820. A chance of
showers. Waves 1 to 3 feet building to 2 to 4 feet today. Waves 2
to 3 feet tonight.

Superior East 11810 15120 11830. A chance of showers. Waves 1 to
3 feet building to 2 to 4 feet today. Waves 2 to 4 feet tonight.

$$

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