334
FZUS63 KMQT 020201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 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
remains sandwiched between a 30.0 inch high over the Central Plains
and a 29.3 low over far northern Quebec. 29.9 inch ridging moves in
Wednesday before building to 30.0 inches late Wednesday night/
Thursday morning; the 30.0 inch ridging remains across the Upper
Great Lakes into Friday. Afterwards, low pressure emerging from the
northern Rockies into central Canada brings a 29.7 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-
1001 PM EDT Tue Jul 1 2025 /901 PM CDT Tue Jul 1 2025/

.REST OF TONIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Haze after midnight. Waves 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. A slight chance
of showers and thunderstorms after midnight. 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-
1001 PM EDT Tue Jul 1 2025

.REST OF TONIGHT...West winds 5 to 15 knots. Haze after midnight.
Waves 1 to 3 feet 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. A slight chance of showers and thunderstorms
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-
1001 PM EDT Tue Jul 1 2025

.REST OF TONIGHT...West winds 5 to 15 knots. Haze after midnight.
Waves 1 to 3 feet.
.WEDNESDAY...West winds 5 to 15 knots backing southwest late.
Waves subsiding to 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-
1001 PM EDT Tue Jul 1 2025

.REST OF 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-
1001 PM EDT Tue Jul 1 2025

.REST OF TONIGHT...Southwest winds 10 to 20 knots veering west
late. A slight chance of showers by midnight. Waves 1 to 3 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 subsiding to 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-
1001 PM EDT Tue Jul 1 2025

.REST OF TONIGHT...South winds 5 to 15 knots veering west late.
Patchy fog by midnight. A slight chance of showers by 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 calm to 2 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.

$$

LSZ261-020800-
MAFOR 0203/
Superior West 14610 13510 11610. Waves 1 to 2 feet.

Superior North Central 14610 11610 11510 12610. Waves 1 to 3
feet.

Superior South Central 11510 13610 12710 11510 11500. Waves 2
feet or less.

Superior East 12500 11610 12600 11610 12600. 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