646
FZUS63 KMQT 270801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM 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 inch high shifts from northern Quebec to the Canadian
Maritimes today while a 29.3 inch low spins over Nunavut and a 29.5
inch nor`easter weakens to 29.7 inches over New Jersey. Lake
Superior will remain under 30.1 inch ridging between these three
features through Monday. A 29.7 inch low develops in the lee of the
northern Rockies on Monday and ejects northeast to northern Ontario
at 29.6 inches by Tuesday. Tuesday night through Wednesday night, a
29.3 inch low moves across the far northern Canadian Prairie to
Hudson Bay, dragging a 29.7 inch trough across Lake Superior
Wednesday night. High pressure of 30.2 inches returns to the Upper
Great Lakes By Friday.



LSZ162-272000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EDT Sun Sep 27 2026 /301 AM CDT Sun Sep 27 2026/

.EARLY THIS MORNING...South winds 5 to 15 knots. A chance of
showers. Waves calm to 2 feet.
.TODAY...South winds 5 to 15 knots veering southwest in the
afternoon. A slight chance of showers through early afternoon.
Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots veering north late. Waves
calm to 2 feet.
.MONDAY...Northeast winds less than 10 knots becoming east 5 to
15 knots in the afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots veering southwest by mid
afternoon. A chance of rain through early afternoon, then rain
likely by mid afternoon. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots becoming southwest
5 to 15 knots after midnight. A chance of rain. Waves calm to
2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots becoming west 10 to
20 knots. Waves calm to 2 feet.
.THURSDAY...West winds 10 to 20 knots veering northwest. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ263-272000-
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 Sun Sep 27 2026

.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 veering southwest in the
afternoon. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots veering north late. Waves
calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots diminishing to less than
10 knots in the afternoon, then becoming east 5 to 15 knots late.
Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.TUESDAY...South winds 15 to 25 knots. A chance of rain by mid
afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots becoming southwest
5 to 15 knots after midnight. A chance of rain. Waves subsiding
to calm to 2 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots veering west. Waves
calm to 2 feet.
.THURSDAY...West winds 20 to 30 knots becoming northwest 15 to
25 knots. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.

$$

LSZ264-272000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 AM EDT Sun Sep 27 2026

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...South winds 5 to 15 knots veering southwest in the
afternoon. Waves calm to 2 feet.
.TONIGHT...West winds less than 10 knots becoming north 5 to
15 knots late. 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. Waves calm to
2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots. A chance of rain by mid
afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. Rain likely through midnight, then a chance of
rain after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots becoming west 10 to
20 knots. Waves calm to 2 feet.
.THURSDAY...West winds 20 to 30 knots becoming northwest 15 to
25 knots. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.

$$

LSZ265-272000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 AM EDT Sun Sep 27 2026

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...South winds 5 to 15 knots diminishing to less than
10 knots late. 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 10 to 20 knots increasing to 15 to
25 knots 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. Rain likely through midnight, then a
chance of rain after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...South winds 10 to 20 knots becoming west 15 to
25 knots. A chance of rain. Waves calm to 2 feet.
.THURSDAY...West gales to 35 knots becoming northwest 20 to
30 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet.

$$

LSZ266-272000-
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 Sun Sep 27 2026

.EARLY THIS MORNING...South winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.TODAY...South winds 5 to 15 knots becoming southwest less than
10 knots late. Waves calm to 2 feet.
.TONIGHT...Southwest winds less than 10 knots veering west after
midnight, then becoming north 5 to 15 knots late. Waves calm to
2 feet.
.MONDAY...North winds 5 to 15 knots diminishing to less than
10 knots late. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 2 to 4 feet.
.TUESDAY NIGHT...South winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Rain likely through midnight, then a
chance of rain after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. A chance of rain. Waves subsiding to calm to 2 feet,
then building to 1 to 3 feet.
.THURSDAY...West winds 20 to 30 knots becoming northwest 15 to
25 knots. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 2 to 4 feet.

$$

LSZ267-272000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 AM EDT Sun Sep 27 2026

.EARLY THIS MORNING...South winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.TODAY...South winds 5 to 15 knots diminishing to less than
10 knots in the afternoon, then backing north late. Waves calm to
2 feet.
.TONIGHT...North winds less than 10 knots becoming northwest 5 to
15 knots after midnight. Patchy fog through midnight. Waves calm
to 2 feet.
.MONDAY...North winds 5 to 15 knots backing northwest in the
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Northwest winds 5 to 15 knots becoming south less
than 10 knots after midnight. 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 rain
through midnight, then rain likely after midnight. Waves building
to 2 to 4 feet, then subsiding to 1 to 3 feet.
.WEDNESDAY...South winds 10 to 20 knots. A chance of rain. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.THURSDAY...West winds 15 to 25 knots becoming northwest 20 to
30 knots. Waves building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ261-271400-
MAFOR 2709/
Superior West 11410 12400 13500 11600 11700. Waves 2 feet or
less.

Superior North Central 12410 14500 11600 11700. Waves 2 feet or
less.

Superior South Central 13400 11300 11200 11500 11600 11700. Waves
1 foot or less.

Superior East 13400 11500 11800 11100 11600 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