245
FZUS63 KMQT 012002
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
402 PM 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 tonight as the lake
becomes sandwiched between a 30.0 inch high building over the
central 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.


LSZ162-020800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
402 PM EDT Tue Jul 1 2025 /302 PM CDT Tue Jul 1 2025/

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
late. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon. A chance of showers and a slight
chance of thunderstorms. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering northeast
after midnight. A slight chance of showers through 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 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. A chance of showers and thunderstorms. Waves
calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. A chance of showers through midnight. A chance of
thunderstorms. Showers likely after midnight. Waves calm to
2 feet.
.SATURDAY...Southwest winds 10 to 20 knots veering north.
Showers. A chance of thunderstorms. A chance of showers. Waves
calm to 2 feet.
.SUNDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ263-020800-
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 Tue Jul 1 2025

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. A slight
chance of showers. Waves 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. 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 veering east by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots veering southeast
after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. A chance of showers through midnight. Showers
likely after midnight. Waves building to 1 to 3 feet.
.SATURDAY...Southwest winds 5 to 15 knots veering north. Showers.
A chance of thunderstorms. A chance of showers. Waves subsiding
to calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots backing northwest. Waves calm
to 2 feet.

$$

LSZ264-020800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
402 PM EDT Tue Jul 1 2025

.LATE THIS AFTERNOON...West winds 10 to 20 knots. A slight chance
of showers. Waves 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 north less
than 10 knots after midnight, then veering northeast late. 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...Southeast winds 5 to 15 knots. Waves building to 1 to
3 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. A chance of showers. Waves 1 to 3 feet.
.SATURDAY...Southwest winds 10 to 20 knots becoming north 5 to
15 knots. Showers. A chance of thunderstorms. A chance of
showers. Waves subsiding to calm to 2 feet, then building to 1 to
3 feet.
.SUNDAY...North winds 5 to 15 knots backing northwest. Waves
subsiding to calm to 2 feet.

$$

LSZ265-020800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
402 PM EDT Tue Jul 1 2025

.LATE THIS AFTERNOON...West winds 10 to 20 knots. 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. A slight chance of showers by
mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southwest 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...Southeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots becoming southwest
10 to 20 knots after midnight. A chance of showers. Waves calm to
2 feet.
.SATURDAY...South winds 15 to 25 knots becoming southwest 10 to
20 knots. A chance of showers. A chance of thunderstorms. Showers
likely. Waves calm to 2 feet.
.SUNDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ266-020800-
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 Tue Jul 1 2025

.LATE THIS AFTERNOON...West winds 10 to 20 knots. A slight chance
of showers. Waves 2 to 4 feet.
.TONIGHT...West winds 10 to 20 knots backing southwest after
midnight, then veering west late. A slight chance of showers
through midnight. 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. Waves calm to
2 feet.
.FRIDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 1 to 3 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots. A chance of showers.
Waves building to 2 to 4 feet.
.SATURDAY...South winds 15 to 25 knots becoming southwest 10 to
20 knots. A chance of showers and thunderstorms. Waves subsiding
to calm to 2 feet, then building to 1 to 3 feet.
.SUNDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers. Waves subsiding to calm to 2 feet,
then building to 1 to 3 feet.

$$

LSZ267-020800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
402 PM EDT Tue Jul 1 2025

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots backing south after
midnight, then veering southwest late. Patchy fog through
midnight. A slight chance of showers through midnight. Waves calm
to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. A slight chance of showers by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north late.
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. Waves building to 1 to
3 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots. A chance of showers.
Waves building to 2 to 4 feet.
.SATURDAY...South winds 10 to 20 knots veering southwest. Showers
and a chance of thunderstorms. Waves subsiding to calm to 2 feet.
.SUNDAY...North winds 10 to 20 knots. A chance of showers. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ261-020200-
MAFOR 0121/
Superior West 12520 14610 12510. Waves 1 to 3 feet.

Superior North Central 11630 12620 14610 11510. Waves 2 to 4 feet
tonight. Waves 1 to 2 feet Wednesday.

Superior South Central 11620 11610 11510 13610 12710. Waves 1 to
2 feet.

Superior East 11510 14500 12600 11610. 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