224
FZUS63 KMQT 272002
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Sun Sep 27 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...

A 30.3 high over the Canadian Maritimes will continue to push east
with the trailing high pressure, at 30.1 inches, lingering over Lake
Superior through Monday evening. Thereafter a 29.7 inch trough will
build into the plains with Lake Superior remaining between the
trough and high pressure over the eastern U.S. The trough will shift
to the western part of the lake by Wednesday night as a 29.3 inch
low moves from the Canadian Prairies to the Hudson bay. Behind the
trough high pressure of 30.4 inches develops over the central plains
Thursday night into Friday, extending 30.2 inch ridging over the
lake.



LSZ162-280800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Sun Sep 27 2026 /301 PM CDT Sun Sep 27 2026/

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering west after
midnight, then veering north late. Patchy fog after midnight.
Waves calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots veering east in the
afternoon, then backing northeast late. Patchy fog through early
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots veering south late. A
chance of showers after midnight. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots becoming southwest 15 to
25 knots by mid afternoon. A chance of showers through early
afternoon, then showers likely by mid afternoon. Waves building
to 1 to 3 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A chance of showers. Waves subsiding to
calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. A chance of showers. Waves calm to
2 feet.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 knots veering west
after midnight. A chance of showers. Waves calm to 2 feet.
.THURSDAY...West winds 15 to 25 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.FRIDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots.
Waves calm to 2 feet.

$$

LSZ263-280800-
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 Sun Sep 27 2026

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots becoming west less than
10 knots after midnight, then becoming north 5 to 15 knots late.
Patchy fog after midnight. Waves calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots diminishing to less than
10 knots in the afternoon, then increasing to 5 to 15 knots late.
Patchy fog through early afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight, then becoming south 10 to 20 knots late. A slight
chance of showers after midnight. Waves building to 1 to 3 feet.
.TUESDAY...South winds 15 to 25 knots veering southwest by mid
afternoon. A slight chance of showers through early afternoon,
then showers likely by mid afternoon. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.TUESDAY NIGHT...Southwest winds 10 to 20 knots becoming south
5 to 15 knots after midnight. A chance of showers. Waves
subsiding to calm to 2 feet.
.WEDNESDAY...South winds 10 to 20 knots veering southwest by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots becoming west
10 to 20 knots after midnight. A chance of showers. Waves
building to 1 to 3 feet.
.THURSDAY...West winds 20 to 30 knots. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.
.FRIDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ264-280800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Sun Sep 27 2026

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots becoming west less than
10 knots after midnight, then becoming north 5 to 15 knots late.
Patchy fog after midnight. Waves calm to 2 feet.
.MONDAY...North winds 5 to 15 knots becoming northeast less than
10 knots in the afternoon, then veering east late. Patchy dense
fog through early afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering south late.
Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots. A chance of showers. Waves
building to 1 to 3 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A chance of showers. Waves 1 to 3 feet.
.WEDNESDAY...South winds 5 to 15 knots. A chance of showers.
Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots becoming west
10 to 20 knots after midnight. A chance of showers. Waves
building to 1 to 3 feet.
.THURSDAY...West gales to 35 knots diminishing to 20 to 30 knots.
Waves building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...West winds 20 to 30 knots becoming northwest 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ265-280800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Sun Sep 27 2026

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering northwest late.
Waves calm to 2 feet.
.MONDAY...North winds 5 to 15 knots veering east late. Waves calm
to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...South winds 15 to 25 knots. A slight chance of showers
by mid afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...South winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Showers likely. Waves subsiding to calm
to 2 feet.
.WEDNESDAY...South winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots becoming west 15 to
25 knots after midnight. A chance of showers. Waves building to
1 to 3 feet.
.THURSDAY...West gales to 40 knots. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...Northwest gales to 35 knots becoming west 15 to
25 knots. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to calm to 2 feet.

$$

LSZ266-280800-
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 Sun Sep 27 2026

.LATE THIS AFTERNOON...East winds less than 10 knots. Waves calm
to 2 feet.
.TONIGHT...Northeast winds less than 10 knots backing west after
midnight, then becoming northwest 5 to 15 knots late. Waves calm
to 2 feet.
.MONDAY...North winds 5 to 15 knots diminishing to less than
10 knots in the afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight, then increasing to 10 to 20 knots late. Waves calm to
2 feet.
.TUESDAY...South winds 15 to 25 knots. A slight chance of showers
by mid afternoon. Waves building to 2 to 4 feet.
.TUESDAY NIGHT...South winds 15 to 25 knots. Showers likely
through midnight, then a chance of showers after midnight. Waves
subsiding to 1 to 3 feet.
.WEDNESDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. A chance of showers. Waves subsiding
to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. A chance of showers. Waves
building to 1 to 3 feet.
.THURSDAY...West gales to 40 knots becoming northwest 20 to
30 knots. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots. Waves subsiding to calm to 2 feet.

$$

LSZ267-280800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Sun Sep 27 2026

.LATE THIS AFTERNOON...North winds less than 10 knots. Waves calm
to 2 feet.
.TONIGHT...Northeast winds less than 10 knots becoming northwest
5 to 15 knots after midnight, then veering north late. Waves calm
to 2 feet.
.MONDAY...North winds 5 to 15 knots backing northwest late. Waves
calm to 2 feet.
.MONDAY NIGHT...Northwest winds 5 to 15 knots becoming west less
than 10 knots after midnight, then backing south late. Waves calm
to 2 feet.
.TUESDAY...South winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...South winds 15 to 25 knots. A chance of showers.
Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.WEDNESDAY...South winds 10 to 20 knots. A chance of showers.
Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 15 to 25 knots veering southwest
after midnight. A chance of showers through midnight, then
showers likely after midnight. Waves building to 1 to 3 feet.
.THURSDAY...West gales to 35 knots becoming northwest 20 to
30 knots. A chance of showers. Waves building to 4 to 8 feet
occasionally to 10 feet.
.FRIDAY...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots. Waves building to 5 to 8 feet occasionally to 10 feet,
then subsiding to 1 to 3 feet.

$$

LSZ261-280200-
MAFOR 2721/
Superior West 12500 11600 11700 11800 11100 11200 11100. Waves 1
foot or less.

Superior North Central 12500 11600 11700 11800 11800 19804 12100.
Waves 1 foot or less.

Superior South Central 11200 11100 12600 11700 13800. Waves 1
foot or less.

Superior East 12100 13700 12800 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