241
FZUS63 KMQT 051401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM EDT Thu Jun 5 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...

30.1 inch high pressure ridging lingers overhead, then slowly
weakens into the weekend. A 29.4 inch low moves southeast over
Northern Ontario toward Lake Superior, bringing 29.6 inch troughing
to Lake Superior on Sunday. This low weakens through the day, while
a secondary 29.6 inch low develops near Lake Huron. This low lifts
north into Ontario Monday morning. 29.9 inch ridging builds back
over the lake by Tuesday afternoon.


LSZ162-052000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Thu Jun 5 2025 /901 AM CDT Thu Jun 5 2025/

.REST OF TODAY...Southwest winds 5 to 15 knots backing east late.
Isolated showers and thunderstorms by mid afternoon. Waves calm
to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots backing west after
midnight, then veering north late. Scattered showers and a slight
chance of thunderstorms. Areas of smoke after midnight. Waves
calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots. Areas of smoke. A slight
chance of showers. Waves calm to 2 feet.
.FRIDAY NIGHT...Northeast winds 5 to 15 knots. A slight chance of
rain showers through midnight. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. A slight chance of showers
by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 10 to 20 knots veering south after
midnight. A chance of showers through midnight, then showers
after midnight. Waves calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots. Showers. Waves building to
1 to 3 feet, then subsiding to calm to 2 feet.
.MONDAY...West winds 10 to 20 knots. Showers likely, then a
chance of showers. Waves calm to 2 feet.

$$

LSZ263-052000-
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 Thu Jun 5 2025

.REST OF TODAY...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...West winds 5 to 15 knots becoming south less than
10 knots after midnight, then veering west late. A chance of
showers. Areas of smoke after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds less than 10 knots becoming west 5 to
15 knots in the afternoon, then backing southwest late. Areas of
smoke. A chance of showers. Waves calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots becoming south less
than 10 knots after midnight. A slight chance of rain showers
through midnight. Waves calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots backing east by mid
afternoon. A slight chance of rain showers by mid afternoon.
Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Showers likely after midnight.
Waves building to 1 to 3 feet.
.SUNDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots. Showers, then a chance of showers. Waves subsiding to
calm to 2 feet.
.MONDAY...West winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.

$$

LSZ264-052000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EDT Thu Jun 5 2025

.REST OF TODAY...Southwest winds 5 to 15 knots backing south
late. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots becoming west less than
10 knots after midnight. A slight chance of rain showers. Areas
of smoke after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds less than 10 knots veering west in the
afternoon. Areas of smoke. A slight chance of rain showers. Waves
calm to 2 feet.
.FRIDAY NIGHT...Southwest winds less than 10 knots. Waves calm to
2 feet.
.SATURDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. A chance of showers after
midnight. Waves building to 1 to 3 feet.
.SUNDAY...South winds 10 to 20 knots diminishing to 5 to
15 knots. Showers, then a chance of showers. Waves building to
2 to 4 feet, then subsiding to calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots backing west. A chance of
showers. Waves calm to 2 feet.

$$

LSZ265-052000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EDT Thu Jun 5 2025

.REST OF TODAY...Southwest winds 5 to 15 knots backing southeast
in the afternoon. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering northwest after
midnight, then backing west late. A slight chance of showers
after midnight. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots veering northwest in the
afternoon, then backing southeast late. A chance of showers.
Areas of smoke by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A chance of showers after midnight. Waves calm to
2 feet.
.SUNDAY...Southeast winds 10 to 20 knots veering southwest.
Showers, then a chance of showers. Waves calm to 2 feet.
.MONDAY...Northwest winds 10 to 20 knots backing west. A chance
of showers. Waves calm to 2 feet.

$$

LSZ266-052000-
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 Thu Jun 5 2025

.REST OF TODAY...Southwest winds 5 to 15 knots backing south
late. Areas of smoke by late morning. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots veering northwest late. A
slight chance of rain showers after midnight. Waves calm to
2 feet.
.FRIDAY...Northwest winds 5 to 15 knots. Areas of smoke. A chance
of rain showers. Waves calm to 2 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves building to 1 to 3 feet.
.SUNDAY...Southeast winds 10 to 20 knots veering south. Showers,
then a chance of showers. Waves building to 2 to 4 feet, then
subsiding to calm to 2 feet.
.MONDAY...Northwest winds 10 to 20 knots. A chance of rain
showers. Waves calm to 2 feet.

$$

LSZ267-052000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EDT Thu Jun 5 2025

.REST OF TODAY...South winds 5 to 15 knots veering southwest in
the afternoon, then backing southeast late. Areas of smoke. Waves
calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots backing northeast late.
Waves calm to 2 feet.
.FRIDAY...Northwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then diminishing to 5 to 15 knots
late. A slight chance of showers. Areas of smoke by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots veering north by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots. Waves calm to
2 feet.
.SUNDAY...Southeast winds 10 to 20 knots. A chance of rain
showers, then rain showers likely. Waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.
.MONDAY...West winds 10 to 20 knots. Rain showers likely, then a
chance of rain showers. Waves calm to 2 feet.

$$

LSZ261-052000-
MAFOR 0515/
Superior West 11500 11400 11300 11200 19206 11500 12700 11400.
Waves 1 foot or less.

Superior North Central 12500 12400 11500 11700 11600 11500. Waves
1 foot or less.

Superior South Central 11500 12300 12400 12700 11600. Waves 1
foot or less.

Superior East 11500 11600 11300 12400 11100 11800 11700. Waves 1
foot or less.

$$

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