635
FZUS63 KMQT 170202
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 PM EDT Mon Jun 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...

A 29.6 inch low currently over northern Minnesota moves over
northern Lake Superior tonight while deepening to 29.5 inches. The
low then further deepens to 29.4 inches over northeastern Ontario
Tuesday afternoon and to 29.1 inches over northern Quebec Wednesday
morning. Meanwhile, a weak 29.8 inch ridge builds over the Lake
Tuesday into early Wednesday. By Wednesday evening, a 29.6 inch low
will approach Lake Michigan from the southwest while another 29.7
inch trough approaches Lake Superior from the northwest. These two
features will merge into a 29.5 inch low over Georgian Bay Thursday
morning while a 30.0 inch high moves over northern Ontario. Weak
30.0 inch ridging then remains over Lake Superior through Friday.


LSZ162-170800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Mon Jun 16 2025 /901 PM CDT Mon Jun 16 2025/

...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM EDT /7 AM CDT/
TUESDAY...

.REST OF TONIGHT...East winds 10 to 20 knots veering west late.
Patchy fog. Showers by midnight. A chance of thunderstorms. A
chance of showers after midnight. Waves 1 to 3 feet building to
2 to 4 feet, then subsiding to 1 to 3 feet.
.TUESDAY...West winds 10 to 20 knots backing southwest in the
afternoon. Patchy fog through early afternoon. Waves subsiding 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 backing south by mid
afternoon. A slight chance of showers by mid afternoon. Waves
calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots. A chance of showers
and a slight chance of thunderstorms. Waves calm to 2 feet.
.THURSDAY...Northeast winds 10 to 20 knots. A chance of showers
through early afternoon. Showers likely by mid afternoon. Waves
calm to 2 feet.
.THURSDAY NIGHT...Northeast winds 5 to 15 knots. A chance of
showers. Waves calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots backing northeast. A chance
of showers, then showers likely. Waves calm to 2 feet.
.SATURDAY...Northeast winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ263-170800-
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 Mon Jun 16 2025

...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM EDT TUESDAY...

.REST OF TONIGHT...East winds 5 to 15 knots becoming south 10 to
20 knots after midnight, then becoming southwest 15 to 25 knots
late. Patchy fog. Showers and thunderstorms likely by midnight. A
chance of showers and thunderstorms after midnight. Waves 1 to
3 feet building to 2 to 4 feet.
.TUESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then becoming southwest 5 to 15 knots
late. Patchy dense fog through early afternoon. A slight chance
of showers through early afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots diminishing to less
than 10 knots late. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots backing southeast by mid
afternoon. 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. A chance of showers. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.
.THURSDAY NIGHT...North winds 5 to 15 knots backing west after
midnight. A chance of showers. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots veering southeast. A chance of
showers, then showers likely. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots veering east. A chance
of showers. Waves calm to 2 feet.

$$

LSZ264-170800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 PM EDT Mon Jun 16 2025

...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM EDT TUESDAY...

.REST OF TONIGHT...Southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight, then becoming south 15 to 25 knots
late. Patchy fog. Showers and thunderstorms likely by midnight. A
chance of showers and thunderstorms after midnight. Waves calm to
2 feet building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then backing southwest late. Patchy
fog through early afternoon. A slight chance of showers through
early afternoon. Waves subsiding to 2 to 4 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots backing southwest after
midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots backing southeast by
mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots backing north after
midnight. A slight chance of showers. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots. A chance of
showers. Waves calm to 2 feet.
.FRIDAY...Southeast winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.

$$

LSZ265-170800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EDT Mon Jun 16 2025

.REST OF TONIGHT...Southeast winds 10 to 20 knots becoming south
15 to 25 knots after midnight. Patchy fog. A chance of showers by
midnight. A chance of thunderstorms. Showers likely after
midnight. Waves 1 to 3 feet building to 3 to 5 feet occasionally
to 7 feet, then subsiding to 2 to 4 feet.
.TUESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots late. A slight chance of showers through early
afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots. A slight chance of showers
by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering
northwest after midnight. A chance of showers. Waves calm to
2 feet.
.THURSDAY...Northwest winds 10 to 20 knots veering north by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots backing west
after midnight. A chance of showers. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots. A chance of showers,
then showers likely. Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots veering southeast. A chance
of showers. Waves calm to 2 feet.

$$

LSZ266-170800-
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 Mon Jun 16 2025

.REST OF TONIGHT...Southeast winds 10 to 20 knots becoming south
15 to 25 knots after midnight. Patchy fog. A chance of showers
and thunderstorms. Waves 1 to 3 feet building to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...Southwest winds 15 to 25 knots veering west in the
afternoon, then diminishing to 10 to 20 knots late. Patchy fog
through early afternoon. A chance of showers through early
afternoon. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 2 to 4 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots backing southwest after
midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. A slight chance of showers. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots backing north
after midnight. A chance of showers. Waves calm to 2 feet.
.THURSDAY...Northwest winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots. A chance of
showers. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots veering south. A chance
of showers, then showers likely. Waves building to 1 to 3 feet.
.SATURDAY...Southeast winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers. Waves subsiding to calm to 2 feet.

$$

LSZ267-170800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EDT Mon Jun 16 2025

.REST OF TONIGHT...South winds 10 to 20 knots becoming southeast
15 to 25 knots after midnight, then veering south late. A chance
of showers and thunderstorms. Waves 1 to 3 feet building to 2 to
4 feet.
.TUESDAY...Southwest winds 15 to 25 knots veering west in the
afternoon, then diminishing to 10 to 20 knots late. A slight
chance of thunderstorms through early afternoon. A chance of
showers. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots becoming north 10 to
20 knots after midnight. A chance of showers. Waves calm to
2 feet.
.THURSDAY...Northwest winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots. A chance of
showers. Waves calm to 2 feet.
.FRIDAY...Northwest winds 10 to 20 knots backing southeast. A
chance of showers, then showers likely. Waves building to 1 to
3 feet.
.SATURDAY...Southeast winds 10 to 20 knots. A chance of showers.
Waves subsiding to calm to 2 feet.

$$

LSZ261-170800-
MAFOR 1703/
Superior West 11326 11520 11630 12620 12510 11610. A chance of
thunderstorms overnight. Waves 2 to 4 feet overnight. Waves 3 to
5 feet subsiding to 2 to 4 feet Tuesday. Waves 1 to 3 feet
Tuesday evening.

Superior North Central 11329 11326 11436 12630 12620 11610. Waves
2 to 3 feet building to 3 to 5 feet overnight. Waves 3 to 6 feet
Tuesday. Waves 2 to 4 feet Tuesday evening.

Superior South Central 11320 12420 11530 11630 11620 11610 11600.
A chance of showers and thunderstorms overnight. A chance of
showers Tuesday morning. Waves 2 to 4 feet building to 3 to 5
feet overnight. Waves 3 to 5 feet subsiding to 2 to 3 feet
Tuesday. Waves 1 to 3 feet Tuesday evening.

Superior East 12320 11430 12530 12620 11600. A chance of showers
and thunderstorms overnight and Tuesday morning. Waves 2 to 4
feet overnight. Waves 3 to 6 feet Tuesday and Tuesday evening.

$$

WFO MQT

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