437
FZUS63 KMQT 161402
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 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 29.7 inch low
over the Upper Mississippi moves across Lakes Michigan and Huron. By
Thursday afternoon, a 30.1 inch high moves over Lake Superior. This
high expands over the Upper Great Lakes by Friday morning, shifting
east to New England by Saturday morning. Another 30.1 inch high
slowly builds over the Upper Great Lakes by Sunday afternoon,
remaining over the Great Lakes region through Monday as it builds to
30.2 inches.


LSZ162-162000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Wed Jul 16 2025 /901 AM CDT Wed Jul 16 2025/

.REST OF TODAY...Northeast winds 15 to 25 knots. Showers likely
by late morning, then a chance of showers by mid afternoon. Waves
3 to 6 feet occasionally to 8 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...Northeast winds 10 to 20 knots becoming northwest 5 to
15 knots after midnight. 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. A slight chance of
showers by mid afternoon. 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-
1001 AM EDT Wed Jul 16 2025

.REST OF TODAY...Northeast winds 15 to 25 knots. A chance of
showers. Waves 3 to 6 feet occasionally to 8 feet, then subsiding
to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Northeast winds 10 to 20 knots becoming north 5 to
15 knots after midnight, then backing northwest late. 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. A slight chance of
showers by mid afternoon. 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-
1001 AM EDT Wed Jul 16 2025

.REST OF TODAY...North winds 10 to 20 knots becoming northeast
5 to 15 knots late. A chance of showers. Waves 3 to 5 feet
occasionally to 7 feet 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-
1001 AM EDT Wed Jul 16 2025

.REST OF TODAY...North winds 15 to 25 knots diminishing to 10 to
20 knots late. A chance of showers. Waves 3 to 5 feet
occasionally to 7 feet subsiding to 2 to 4 feet.
.TONIGHT...North winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
A chance of showers. Waves building to 3 to 5 feet occasionally
to 7 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-
1001 AM EDT Wed Jul 16 2025

.REST OF TODAY...North winds 15 to 25 knots diminishing to 10 to
20 knots late. A chance of showers. Waves 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...North winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A slight chance of thunderstorms through
midnight. A chance of showers. Waves building to 3 to 6 feet
occasionally to 8 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-
1001 AM EDT Wed Jul 16 2025

.REST OF TODAY...North winds 10 to 20 knots. A slight chance of
showers. Waves 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Northeast winds 10 to 20 knots becoming north 15 to
25 knots late. A chance of showers and a slight chance of
thunderstorms. Waves subsiding to 2 to 4 feet, then building to
3 to 6 feet occasionally to 8 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
calm to 2 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots becoming southwest
5 to 15 knots after midnight. Waves 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.

$$

LSZ261-162000-
MAFOR 1615/
Superior West 11136 11130 11120 11110 11810 11710 11700 11800.
Waves 3 to 5 feet subsiding to 2 to 4 feet this afternoon. Waves
2 to 4 feet subsiding to 1 to 3 feet tonight. Waves 1 foot or
less Thursday morning.

Superior North Central 11820 11120 11110 13810 12800. A chance of
showers this afternoon and overnight. Waves 3 to 5 feet subsiding
to 2 to 4 feet this afternoon. Waves 1 to 3 feet tonight and
Thursday morning.

Superior South Central 14820 11820 12830 11810. A chance of
showers. Waves 3 to 5 feet this afternoon and tonight. Waves 2 to
4 feet subsiding to 1 to 3 feet Thursday morning.

Superior East 11120 11820 13120 13830. A chance of showers. Waves
3 to 5 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