784
FZUS63 KMQT 222002
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Tue Sep 22 2026

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...

30.5 inc high pressure currently centered over the Ontario/Quebec
border strengthens 30.6 inches over Quebec by Wednesday morning. This
keeps a 30.5 inch ridge over Lake Superior while mainly easterly
surface winds persist. The Quebec high begins to break down Thursday
morning, weakening to 30.4 inches by Thursday night as light winds
veer southerly. By late Friday, the high weakens to 30.2 inches over
the eastern Great Lakes basin as 29.5 inch low pressure develops
over Montana. Southerly flow persists through Saturday as the high
deteriorates further and the Montana low pressure deepens and moves
north toward the Canadian Prairies.



LSZ162-230800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Tue Sep 22 2026 /301 PM CDT Tue Sep 22 2026/

.LATE THIS AFTERNOON...Northeast winds 15 to 25 knots. Waves 1 to
3 feet building to 2 to 4 feet.
.TONIGHT...East winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight, then veering southeast late. Waves subsiding to
calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots backing east in the
afternoon, then increasing to 10 to 20 knots late. Waves building
to 1 to 3 feet.
.WEDNESDAY NIGHT...East winds 10 to 20 knots veering south after
midnight, then diminishing to 5 to 15 knots late. Waves subsiding
to calm to 2 feet, then building to 1 to 3 feet.
.THURSDAY...South winds 5 to 15 knots backing east by mid
afternoon. A slight chance of showers. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots becoming south less
than 10 knots after midnight. Waves calm to 2 feet.
.FRIDAY...South winds less than 10 knots becoming east 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots veering south. A
chance of showers. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots veering west. Waves calm
to 2 feet.

$$

LSZ263-230800-
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 PM EDT Tue Sep 22 2026

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves calm to
2 feet building to 1 to 3 feet.
.TONIGHT...East winds 10 to 20 knots becoming southeast 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots backing east late.
Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight, then diminishing to 5 to 15 knots late. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots backing northeast by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots becoming south 10 to
20 knots. A chance of showers. Waves calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ264-230800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Tue Sep 22 2026

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight, then diminishing to 5 to 15 knots late. Waves
calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...Southwest winds less than 10 knots backing south by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.SATURDAY...Southeast winds 10 to 20 knots veering south. Waves
calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots veering west. Waves calm
to 2 feet.

$$

LSZ265-230800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Tue Sep 22 2026

.LATE THIS AFTERNOON...East winds 15 to 25 knots. Waves calm to
2 feet.
.TONIGHT...East winds 15 to 25 knots becoming southeast 10 to
20 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots becoming east 15 to
25 knots late. Waves building to 1 to 3 feet.
.WEDNESDAY NIGHT...Southeast winds 15 to 25 knots becoming south
10 to 20 knots after midnight, then diminishing to 5 to 15 knots
late. Waves subsiding to calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots becoming south
5 to 15 knots after midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 15 to 25 knots becoming south 10 to
20 knots. Waves calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots becoming west 5 to 15 knots.
Waves calm to 2 feet.

$$

LSZ266-230800-
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 PM EDT Tue Sep 22 2026

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots increasing to 10 to 20 knots
after midnight, then becoming southeast 5 to 15 knots late. Waves
calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then backing east late. Waves calm to
2 feet.
.WEDNESDAY NIGHT...Southeast winds 10 to 20 knots becoming south
15 to 25 knots after midnight, then diminishing to 10 to 20 knots
late. Waves building to 1 to 3 feet, then subsiding to calm to
2 feet.
.THURSDAY...South winds 10 to 20 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots veering south. Waves
calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots becoming southwest 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ267-230800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Tue Sep 22 2026

.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots becoming southeast 10 to
20 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots backing east in the
afternoon, then diminishing to 5 to 15 knots late. Waves calm to
2 feet.
.WEDNESDAY NIGHT...Southeast winds 10 to 20 knots veering south
late. Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots becoming south 10 to
20 knots. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots veering southwest. Waves calm
to 2 feet.

$$

LSZ261-230200-
MAFOR 2221/
Superior West 11120 12220 11310 13300 11200. Waves 1 to 3 feet.

Superior North Central 12210 12310 12300 12310. Waves 1 to 2
feet.

Superior South Central 12220 11320 12310 11300 11310 11210. Waves
1 to 2 feet.

Superior East 12100 11210 14310 11210. Waves 2 feet 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