792
FZUS63 KMQT 291403
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1002 AM EDT Sun Jun 29 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 29.6 inch low passing through northern Ontario today and tonight
sends a 29.8 inch trough over the lake this afternoon through
tonight. Monday into Tuesday, Lake Superior is expected to be
between a 30.0 inch high over the Plains and a low over Quebec
deepening from 29.6 to 29.4 inches, with 29.8 inch troughing holding
steady over the lake until Wednesday morning. 30.0 inch ridging then
builds over the western Great Lakes Thursday. Low pressure emerging
from the northern Rockies into central Canada reintroduces troughing
in the Great Lakes next weekend.


LSZ162-292000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1002 AM EDT Sun Jun 29 2025 /902 AM CDT Sun Jun 29 2025/

.REST OF TODAY...Southwest winds 5 to 15 knots increasing to
10 to 20 knots in the afternoon. A chance of thunderstorms and a
slight chance of showers. Waves calm to 2 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering west after
midnight. A slight chance of showers and thunderstorms through
midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots veering west late. A
chance of showers and a slight chance of thunderstorms by mid
afternoon. Waves building to 1 to 3 feet.
.MONDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots becoming north 5 to
15 knots. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots. A chance of showers. A
chance of thunderstorms. Waves calm to 2 feet.

$$

LSZ263-292000-
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-
1002 AM EDT Sun Jun 29 2025

.REST OF TODAY...Southwest winds 5 to 15 knots. A chance of
showers. A slight chance of thunderstorms by mid afternoon. Waves
calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering west late. A
slight chance of showers and thunderstorms through midnight.
Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon. A slight chance of showers and
thunderstorms by mid afternoon. Waves building to 1 to 3 feet.
.MONDAY NIGHT...West winds 5 to 15 knots. Waves 1 to 3 feet.
.TUESDAY...West winds 10 to 20 knots. Waves building to 2 to
4 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots veering south. A chance
of thunderstorms. Waves calm to 2 feet.

$$

LSZ264-292000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1002 AM EDT Sun Jun 29 2025

.REST OF TODAY...Southwest winds 5 to 15 knots backing south
late. A slight chance of showers and thunderstorms by mid
afternoon. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots veering west late. A slight
chance of thunderstorms through midnight. A slight chance of
showers. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots late. A slight chance of showers by mid afternoon. Waves
building to 1 to 3 feet.
.MONDAY NIGHT...West winds 5 to 15 knots. Waves 1 to 3 feet.
.TUESDAY...West winds 10 to 20 knots. Waves building to 2 to
4 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots becoming north 5 to
15 knots. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-292000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1002 AM EDT Sun Jun 29 2025

.REST OF TODAY...South winds 10 to 20 knots backing southeast
late. A chance of showers and thunderstorms. Waves calm to
2 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest after
midnight, then becoming west 5 to 15 knots late. A slight chance
of thunderstorms through midnight. A chance of showers. Waves
calm to 2 feet.
.MONDAY...West winds 10 to 20 knots backing southwest late. A
slight chance of showers and thunderstorms by mid afternoon.
Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 10 to 20 knots veering west after
midnight. A slight chance of showers and thunderstorms through
midnight. Waves calm to 2 feet.
.TUESDAY...West winds 15 to 25 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots. Waves calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots becoming south 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ266-292000-
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-
1002 AM EDT Sun Jun 29 2025

.REST OF TODAY...South winds 10 to 20 knots backing southeast
late. A chance of showers and thunderstorms. Waves calm to
2 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest after
midnight. A slight chance of thunderstorms through midnight. A
chance of showers. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots veering west in the
afternoon, then backing southwest late. A slight chance of
showers. A slight chance of thunderstorms by mid afternoon. Waves
calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots becoming west 10 to
20 knots after midnight. A slight chance of showers and
thunderstorms through midnight. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. Waves building to 2 to 4 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots veering south. Waves calm
to 2 feet.

$$

LSZ267-292000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1002 AM EDT Sun Jun 29 2025

.REST OF TODAY...South winds 10 to 20 knots backing southeast
late. A chance of showers and thunderstorms. Waves calm to
2 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest after
midnight. A chance of showers and thunderstorms. Waves calm to
2 feet.
.MONDAY...Southwest winds 5 to 15 knots veering northwest late. A
chance of showers. A slight chance of thunderstorms by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. A slight chance of showers and thunderstorms through
midnight. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots. Waves building to 1 to
3 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...Northwest winds 10 to 20 knots backing southeast.
Waves calm to 2 feet.

$$

LSZ261-292000-
MAFOR 2915/
Superior West 11500 14510 13610. A chance of showers and
thunderstorms this afternoon and evening. Waves 2 feet or less.

Superior North Central 11500 13410 12510 11610 11510. Waves 1 to
2 feet.

Superior South Central 11400 12310 11400 11500 11510 12610. A
chance of showers this afternoon. A chance of showers and
thunderstorms this evening, then a chance of showers overnight.
Waves 2 feet or less.

Superior East 11410 11300 11310 12410 11510 12500. A chance of
showers and thunderstorms this afternoon and tonight. 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