934
FZUS63 KMQT 150201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 PM EDT Fri Aug 14 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...

30.2 inch high pressure over Lake Superior eventually gives way to a
29.9 inch low by tomorrow night as the aforementioned high moves
east towards New England. This low deepens to 29.8 inches as it
reaches the Lower Great Lakes by Sunday afternoon. Sunday night into
Monday, a 30.1 inch high over the Plains weakens to 30.0 inches as
it slides generally south of Lake Superior. By Tuesday, this high
becomes centered south of the Great Lakes as a 29.4 inch low over
Hudson Bay extends a 29.8 inch trough over Lake Superior. A second
29.7 inch low moves through the Great Lakes region into southern
Ontario on Wednesday.



LSZ162-150800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Fri Aug 14 2026 /901 PM CDT Fri Aug 14 2026/

.REST OF TONIGHT...Northeast winds 10 to 20 knots veering east
late. Waves 1 to 3 feet subsiding to calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots backing northeast late. A
chance of showers. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 10 to 20 knots becoming north
5 to 15 knots after midnight, then backing west late. A slight
chance of showers through midnight. Waves calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. A chance of showers. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots veering north. A chance of
showers. Waves calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots backing northwest. Waves
calm to 2 feet.

$$

LSZ263-150800-
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 PM EDT Fri Aug 14 2026

.REST OF TONIGHT...East winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. A chance of showers by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots backing northwest
after midnight, then backing west late. A chance of showers and a
slight chance of thunderstorms through midnight. Waves calm to
2 feet.
.SUNDAY...West winds 10 to 20 knots. A slight chance of showers
through early afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots becoming southwest 15 to
25 knots by mid afternoon. Waves building to 1 to 3 feet.
.MONDAY NIGHT...Southwest winds 10 to 20 knots veering west after
midnight. A chance of showers. Waves subsiding to calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots veering north. A chance of
showers. Waves calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots backing west. Waves calm
to 2 feet.

$$

LSZ264-150800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 PM EDT Fri Aug 14 2026

.REST OF TONIGHT...Southeast winds 5 to 15 knots backing east
after midnight. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
late. A chance of showers by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots veering northwest
late. Showers likely through midnight, then a slight chance of
showers after midnight. Waves calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots backing west by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots veering north. A chance of
showers. Waves calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots backing west. Waves calm
to 2 feet.

$$

LSZ265-150800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EDT Fri Aug 14 2026

.REST OF TONIGHT...East winds 5 to 15 knots veering southeast
late. Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots backing east in the
afternoon, then increasing to 15 to 25 knots late. A slight
chance of showers by mid afternoon. Waves building to 1 to
3 feet.
.SATURDAY NIGHT...Southeast winds 15 to 25 knots diminishing to
10 to 20 knots after midnight, then veering west late. A slight
chance of thunderstorms through midnight. A chance of showers.
Waves subsiding to calm to 2 feet.
.SUNDAY...Northwest winds 20 to 30 knots. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 1 to 3 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.MONDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots becoming southwest
15 to 25 knots after midnight. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots veering north. A chance of
showers. Waves calm to 2 feet.
.WEDNESDAY...North winds 10 to 20 knots backing northwest. A
chance of showers. Waves building to 1 to 3 feet, then subsiding
to calm to 2 feet.

$$

LSZ266-150800-
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 PM EDT Fri Aug 14 2026

.REST OF TONIGHT...North winds less than 10 knots becoming east
5 to 15 knots after midnight. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. A slight chance of showers by mid afternoon.
Waves building to 1 to 3 feet.
.SATURDAY NIGHT...Southeast winds 15 to 25 knots diminishing to
10 to 20 knots after midnight, then veering south late. A chance
of showers and a slight chance of thunderstorms. Waves subsiding
to calm to 2 feet.
.SUNDAY...Northwest winds 20 to 30 knots. Waves building to 3 to
6 feet occasionally to 8 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.MONDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots becoming north 5 to
15 knots. A chance of showers. Waves calm to 2 feet.
.WEDNESDAY...North winds 10 to 20 knots backing northwest. A
chance of showers. Waves building to 1 to 3 feet, then subsiding
to calm to 2 feet.

$$

LSZ267-150800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EDT Fri Aug 14 2026

.REST OF TONIGHT...North winds 5 to 15 knots veering east late.
Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots. A chance of
showers through midnight, then showers likely and a slight chance
of thunderstorms after midnight. Waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots becoming northwest 15 to
25 knots by mid afternoon. A slight chance of showers through
early afternoon. Waves building to 3 to 5 feet occasionally to
7 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots veering northwest. A chance
of showers. Waves calm to 2 feet.
.WEDNESDAY...North winds 10 to 20 knots backing northwest. A
chance of showers. Waves building to 1 to 3 feet, then subsiding
to calm to 2 feet.

$$

LSZ261-150800-
MAFOR 1503/
Superior West 11220 14210 11220 11126 11120. Waves 1 to 2 feet.

Superior North Central 13300 12310 12220 11226. Waves 2 feet or
less.

Superior South Central 12200 12310 11320 12230 11320. A chance of
showers Saturday evening. Waves 1 foot or less overnight. Waves 1
to 3 feet Saturday and Saturday evening.

Superior East 11800 11100 12200 11300 12210 11320. Waves 2 feet
or less overnight and Saturday. Waves 1 to 3 feet Saturday
evening.

$$

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