801
FZUS63 KMQT 160802
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 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-
401 AM EDT Mon Jun 16 2025 /301 AM CDT Mon Jun 16 2025/

.EARLY THIS MORNING...East winds 5 to 15 knots. A slight chance
of showers and thunderstorms. Waves calm to 2 feet.
.TODAY...East winds 5 to 15 knots backing northeast late. A
chance of showers. A chance of thunderstorms by mid afternoon.
Waves calm to 2 feet.
.TONIGHT...East winds 10 to 20 knots backing northeast after
midnight, then backing west late. Showers with thunderstorms
likely through midnight, then a chance of showers after midnight.
Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots in the afternoon. Waves building to 1 to 3 feet, then
subsiding to calm to 2 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-
401 AM EDT Mon Jun 16 2025

.EARLY THIS MORNING...East winds less than 10 knots. A slight
chance of showers. Waves calm to 2 feet.
.TODAY...East winds less than 10 knots veering southeast in the
afternoon, then becoming east 5 to 15 knots late. A chance of
showers. A chance of thunderstorms by mid afternoon. Waves calm
to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering south after midnight,
then veering west late. Showers likely through midnight. A chance
of thunderstorms. A chance of showers after midnight. Waves
building to 1 to 3 feet.
.TUESDAY...West winds 5 to 15 knots backing southwest late. A
slight chance of showers through early afternoon. Waves 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. 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-
401 AM EDT Mon Jun 16 2025

.EARLY THIS MORNING...South winds less than 10 knots. A slight
chance of showers. Waves calm to 2 feet.
.TODAY...South winds less than 10 knots backing southeast in the
afternoon, then increasing to 5 to 15 knots late. A slight 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 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. 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-
401 AM EDT Mon Jun 16 2025

.EARLY THIS MORNING...South winds 5 to 15 knots. A slight chance
of showers. Waves calm to 2 feet.
.TODAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots in the afternoon, then backing east late. A chance of
showers. A chance of thunderstorms by mid afternoon. Waves calm
to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering south after
midnight. A chance of showers and thunderstorms. Waves building
to 1 to 3 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-
401 AM EDT Mon Jun 16 2025

.EARLY THIS MORNING...South winds 10 to 20 knots. A slight chance
of showers. Waves calm to 2 feet.
.TODAY...South winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon, then backing southeast 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. 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-
401 AM EDT Mon Jun 16 2025

.EARLY THIS MORNING...South winds 10 to 20 knots. Waves calm to
2 feet.
.TODAY...South winds 10 to 20 knots backing southeast in the
afternoon. 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. A chance of showers
and 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.

$$

LSZ261-161400-
MAFOR 1609/
Superior West 14200 11100 11119 11216 11616. Waves 2 feet or
less.

Superior North Central 13400 12300 11216 11316 11426. A chance of
thunderstorms tonight. Waves 1 foot or less today. Waves 1 to 3
feet building to 2 to 4 feet tonight.

Superior South Central 12400 11300 13310 12420. A chance of
showers and thunderstorms tonight. Waves 1 foot or less today.
Waves 1 to 3 feet building to 2 to 4 feet tonight.

Superior East 12400 12300 12310 12320. A chance of showers this
evening, then a chance of showers and thunderstorms overnight.
Waves around 1 foot today. Waves 1 to 3 feet building to 2 to 4
feet tonight.

$$

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