495
FZUS63 KMQT 010802
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM EDT Tue Jul 1 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 29.8 inch trough remains over Lake Superior through tonight as the
lake becomes sandwiched between a 30.0 inch high descending
southeast over the Plains and a low over Quebec deepening from 29.5
to 29.3 inches. 30.0 inch ridging then passes southeast over the
Upper Great Lakes Thursday into Friday. Then, low pressure emerging
from the northern Rockies into central Canada brings a 29.6 inch
trough through Lake Superior Saturday into Sunday.


LSZ162-012000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EDT Tue Jul 1 2025 /301 AM CDT Tue Jul 1 2025/

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

$$

LSZ263-012000-
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 AM EDT Tue Jul 1 2025

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves 1 to
3 feet.
.TODAY...West winds 10 to 20 knots backing southwest in the
afternoon. A slight chance of showers and thunderstorms by mid
afternoon. Waves building to 2 to 4 feet.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots backing southwest late. A
slight chance of showers and thunderstorms by mid afternoon.
Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots becoming northeast
less than 10 knots after midnight. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots veering southeast
after midnight. A chance of showers and thunderstorms. Waves calm
to 2 feet.
.FRIDAY...South winds 5 to 15 knots veering southwest. A chance
of showers. A chance of thunderstorms. Showers likely. Waves
building to 1 to 3 feet.
.SATURDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots. Showers likely. A chance of showers. Waves subsiding to
calm to 2 feet.

$$

LSZ264-012000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 AM EDT Tue Jul 1 2025

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

$$

LSZ265-012000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 AM EDT Tue Jul 1 2025

.EARLY THIS MORNING...West winds 10 to 20 knots. Waves calm to
2 feet.
.TODAY...West winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon, then diminishing to 10 to 20 knots late. Waves
calm to 2 feet.
.TONIGHT...West winds 10 to 20 knots. Waves calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots veering northwest in the
afternoon, then backing west late. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots veering south. A chance
of showers. Showers likely. Waves calm to 2 feet.
.SATURDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots. Showers likely and a chance of thunderstorms, then a
chance of showers. Waves calm to 2 feet.

$$

LSZ266-012000-
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 AM EDT Tue Jul 1 2025

.EARLY THIS MORNING...West winds 10 to 20 knots. Waves calm to
2 feet building to 1 to 3 feet.
.TODAY...West winds 10 to 20 knots. Waves subsiding to calm to
2 feet, then building to 2 to 4 feet.
.TONIGHT...West winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.WEDNESDAY...West winds 10 to 20 knots veering northwest in the
afternoon, then becoming west 5 to 15 knots late. A slight chance
of showers by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 2 to 4 feet.
.SATURDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots. Showers likely, then a chance of showers. Waves
subsiding to 1 to 3 feet.

$$

LSZ267-012000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 AM EDT Tue Jul 1 2025

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
late. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...Southeast winds 10 to 20 knots becoming south 15 to
25 knots. A chance of showers. Waves building to 2 to 4 feet.
.SATURDAY...South winds 15 to 25 knots becoming west 10 to
20 knots. Showers likely. Waves subsiding to calm to 2 feet.

$$

LSZ261-011400-
MAFOR 0109/
Superior West 11610 11620 13520 11620 12610. Waves 1 to 3 feet.

Superior North Central 11610 11620 11520 11530 11630 12620 11610.
Waves 2 to 4 feet.

Superior South Central 11610 14620 11620 12610. Waves 1 to 3
feet.

Superior East 13610 11510 11610 12510 11500. Waves 1 to 3 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