813
FZUS63 KMQT 161401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM 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...

This morning, Lake Superior is situated between a 30.2 inch high
over New England and a 29.8 inch low over the Dakotas. This low
deepens to 29.6 inches as it approaches the western arm of Lake
Superior tonight. The low then further deepens to 29.4 inches over
northeastern Ontario Tuesday afternoon and to 29.1 inches over
northern Quebec Wednesday morning. Throughout the day Wednesday, a
29.6 inch low will approach Lake Michigan from the southwest while
lingering 29.7 inch troughing 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.


LSZ162-162000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Mon Jun 16 2025 /901 AM CDT Mon Jun 16 2025/

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

$$

LSZ263-162000-
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 AM EDT Mon Jun 16 2025

.REST OF TODAY...South winds less than 10 knots becoming east
5 to 15 knots late. A chance of showers. A slight chance of
thunderstorms by mid afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering south after midnight,
then becoming southwest 10 to 20 knots late. Showers likely
through midnight. A chance of thunderstorms. A chance of showers
after midnight. Waves building to 2 to 4 feet.
.TUESDAY...West winds 5 to 15 knots backing southwest late. A
slight chance of showers 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...Southwest winds 5 to 15 knots backing south by mid
afternoon. A slight chance of showers. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering northwest
after midnight. A chance of showers. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots veering south. A chance of
showers. Waves calm to 2 feet.
.FRIDAY...Southeast winds 5 to 15 knots. A chance of showers,
then showers likely. Waves calm to 2 feet.

$$

LSZ264-162000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EDT Mon Jun 16 2025

.REST OF TODAY...South winds less than 10 knots becoming
southeast 5 to 15 knots late. A slight chance of showers. A
slight chance of thunderstorms by mid afternoon. Waves calm to
2 feet.
.TONIGHT...Southeast winds 5 to 15 knots becoming southwest 10 to
20 knots late. Showers likely through midnight. A chance of
thunderstorms. A chance of showers after midnight. Waves building
to 2 to 4 feet.
.TUESDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots late. A chance of showers and a slight chance of
thunderstorms through early afternoon. Waves subsiding to 1 to
3 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Southwest 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 northwest
after midnight. A chance of showers. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing west. A chance of
showers. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots backing southeast. A chance
of showers, then showers likely. Waves calm to 2 feet.

$$

LSZ265-162000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EDT Mon Jun 16 2025

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

$$

LSZ266-162000-
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 AM EDT Mon Jun 16 2025

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

$$

LSZ267-162000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EDT Mon Jun 16 2025

.REST OF TODAY...South winds 5 to 15 knots backing southeast in
the afternoon, then increasing to 10 to 20 knots late. A slight
chance of showers. Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A chance of showers and a slight chance
of thunderstorms. Waves building to 2 to 4 feet.
.TUESDAY...Southwest winds 10 to 20 knots veering west in the
afternoon. A chance of thunderstorms through early afternoon. A
chance of showers. Waves subsiding to 1 to 3 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 10 to 20 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.
.FRIDAY...Southeast winds 10 to 20 knots veering south. A chance
of showers, then showers likely. Waves building to 1 to 3 feet.

$$

LSZ261-162000-
MAFOR 1615/
Superior West 11300 11200 11110 11216 11319 11516 11620 11610.
Waves 1 foot or less this afternoon. Waves 2 feet or less
building to 2 to 3 feet tonight. Waves 2 to 4 feet Tuesday
morning.

Superior North Central 11400 11300 11310 12316 11426 11526 11620.
A chance of thunderstorms tonight and Tuesday morning. Waves 1
foot or less this afternoon. Waves 1 to 3 feet tonight. Waves 2
to 4 feet Tuesday morning.

Superior South Central 12300 12310 12420 12520. A chance of
thunderstorms this afternoon. A chance of showers and
thunderstorms tonight. A chance of showers Tuesday morning. Waves
1 foot or less this afternoon. Waves 1 to 3 feet building to 2 to
4 feet tonight. Waves 2 to 4 feet subsiding to 1 to 3 feet
Tuesday morning.

Superior East 11400 11300 12310 12420 11436 11520. A chance of
thunderstorms tonight and Tuesday morning. Waves 1 foot or less
this afternoon. Waves 1 to 2 feet building to 2 to 4 feet
tonight. Waves 2 to 4 feet Tuesday morning.

$$

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