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Hurricane Symbol Storm Special! View the latest observations near Atlantic Post-Tropical Cyclone Teddy and East Pacific Tropical Storm Lowell.

National Weather Service Marine Forecast FZUS63 KMQT

FZUS63 KMQT 230741
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
341 AM EDT Wed Sep 23 2020

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 high pressure ridge of 30.0 inches will break down
today as a 29.8 inch low lifts toward the Upper Great Lakes
tonight. Troughing of 29.8 inches will linger ofer the lake
Thursday. Another low of 29.6 inches will move over Lake Superior
Friday night into Saturday. Brief high pressure of 29.7 inches
will follow on Saturday, before another low of 29.4 inches tracks
into Ontario, swinging a 29.5 inch trough through the region
Sunday.

LSZ162-231545-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
341 AM EDT Wed Sep 23 2020 /241 AM CDT Wed Sep 23 2020/

EARLY THIS MORNING
Southwest winds 5 to 15 knots. Waves calm
to 2 feet.

TODAY
Southwest winds 5 to 15 knots. Waves calm to 2 feet.

TONIGHT
Northeast winds 10 to 20 knots veering east after
midnight, then becoming northeast 15 to 25 knots late. A chance
of showers and a slight chance of thunderstorms. Waves building
to 3 to 5 feet occasionally to 7 feet.

THURSDAY
Northeast winds 15 to 25 knots. A chance of showers
through early afternoon. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.

THURSDAY NIGHT
Northeast winds 5 to 15 knots veering east
after midnight. Waves subsiding to calm to 2 feet.

FRIDAY
South winds 5 to 15 knots backing east by mid
afternoon. A chance of showers by mid afternoon. Waves calm to
2 feet.

FRIDAY NIGHT
West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A chance of showers. Waves calm to
2 feet.

SATURDAY
West winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.

SUNDAY
West winds 10 to 20 knots veering northwest. A chance
of showers. Waves calm to 2 feet.



LSZ263-231545-
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-
341 AM EDT Wed Sep 23 2020

EARLY THIS MORNING
Southwest winds 5 to 15 knots. Waves calm
to 2 feet.

TODAY
Southwest winds 5 to 15 knots veering west late. Waves
calm to 2 feet.

TONIGHT
Northeast winds 10 to 20 knots increasing to 15 to
25 knots late. A chance of showers and a slight chance of
thunderstorms. Waves building to 2 to 4 feet.

THURSDAY
Northeast winds 15 to 25 knots diminishing to 10 to
20 knots late. A slight chance of showers through early
afternoon. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 3 to 5 feet occasionally to 7 feet.

THURSDAY NIGHT
East winds 5 to 15 knots veering southeast
after midnight. Waves subsiding to calm to 2 feet.

FRIDAY
South winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. A chance of showers by mid afternoon. Waves
calm to 2 feet.

FRIDAY NIGHT
Southwest winds 5 to 15 knots becoming west 10 to
20 knots after midnight. Showers likely through midnight. A
chance of thunderstorms. Waves calm to 2 feet.

SATURDAY
West winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.

SUNDAY
West winds 10 to 20 knots veering northwest. A chance
of showers. Waves calm to 2 feet.



LSZ264-231545-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
341 AM EDT Wed Sep 23 2020

EARLY THIS MORNING
Southwest winds less than 10 knots. Waves
calm to 2 feet.

TODAY
Southwest winds 5 to 15 knots veering northwest late.
Waves calm to 2 feet.

TONIGHT
North winds 5 to 15 knots veering northeast after
midnight, then increasing to 10 to 20 knots late. A slight chance
of showers after midnight. Waves building to 2 to 4 feet.

THURSDAY
Northeast winds 5 to 15 knots veering east in the
afternoon. A slight chance of showers through early afternoon.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 1 to 3 feet.

THURSDAY NIGHT
East winds 5 to 15 knots veering southeast
after midnight. Waves subsiding to calm to 2 feet.

FRIDAY
South winds 5 to 15 knots. A chance of showers by mid
afternoon. Waves calm to 2 feet.

FRIDAY NIGHT
South winds 5 to 15 knots veering west after
midnight. Showers likely through midnight. A chance of
thunderstorms. A chance of showers after midnight. Waves calm to
2 feet.

SATURDAY
West winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.

SUNDAY
West winds 10 to 20 knots becoming northwest 5 to
15 knots. A chance of showers. Waves calm to 2 feet.



LSZ265-231545-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
341 AM EDT Wed Sep 23 2020

EARLY THIS MORNING
Southwest winds 5 to 15 knots. Waves calm
to 2 feet.

TODAY
Southwest winds 5 to 15 knots veering west late. Waves
calm to 2 feet.

TONIGHT
North winds 5 to 15 knots becoming northeast 10 to
20 knots after midnight. A chance of showers after midnight.
Waves building to 1 to 3 feet.

THURSDAY
Northeast winds 10 to 20 knots veering east in the
afternoon. A slight chance of thunderstorms through early
afternoon. A chance of showers. Waves 1 to 3 feet.

THURSDAY NIGHT
East winds 5 to 15 knots veering south after
midnight. Waves subsiding to calm to 2 feet.

FRIDAY
South winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Waves calm to 2 feet.

FRIDAY NIGHT
South winds 10 to 20 knots veering southwest
after midnight. Showers likely through midnight. A chance of
thunderstorms. A chance of showers after midnight. Waves calm to
2 feet.

SATURDAY
West winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers. Waves calm to 2 feet.

SUNDAY
West winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.



LSZ266-231545-
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-
341 AM EDT Wed Sep 23 2020

EARLY THIS MORNING
South winds 5 to 15 knots. Waves calm to
2 feet.

TODAY
South winds 5 to 15 knots veering northwest late. Waves
calm to 2 feet.

TONIGHT
North winds 5 to 15 knots veering northeast after
midnight, then increasing to 10 to 20 knots late. A slight chance
of showers after midnight. Waves building to 2 to 4 feet.

THURSDAY
Northeast winds 10 to 20 knots veering east in the
afternoon. A chance of showers. Waves subsiding to calm to
2 feet.

THURSDAY NIGHT
East winds 5 to 15 knots veering south after
midnight. A slight chance of showers through midnight. Patchy fog
after midnight. Waves calm to 2 feet.

FRIDAY
South winds 10 to 20 knots. Waves building to 1 to
3 feet.

FRIDAY NIGHT
South winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. Showers likely. Waves 1 to 3 feet.

SATURDAY
West winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers. Waves subsiding to calm to 2 feet.

SUNDAY
West winds 10 to 20 knots veering northwest. A chance
of showers. Waves calm to 2 feet.



LSZ267-231545-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
341 AM EDT Wed Sep 23 2020

EARLY THIS MORNING
South winds 5 to 15 knots. Waves calm to
2 feet.

TODAY
South winds 5 to 15 knots. Waves calm to 2 feet.

TONIGHT
Northwest winds 5 to 15 knots veering north after
midnight, then becoming northeast 10 to 20 knots late. A slight
chance of showers after midnight. Waves building to 1 to 3 feet.

THURSDAY
East winds 10 to 20 knots becoming northeast 5 to
15 knots late. A chance of showers. Waves subsiding to calm to
2 feet.

THURSDAY NIGHT
Southeast winds 10 to 20 knots veering south
after midnight. A slight chance of showers through midnight.
Waves calm to 2 feet.

FRIDAY
South winds 10 to 20 knots. Waves building to 1 to
3 feet.

FRIDAY NIGHT
South winds 15 to 25 knots veering southwest
after midnight. A chance of showers through midnight. Showers
likely after midnight. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.

SATURDAY
West winds 10 to 20 knots backing southwest. A chance
of showers and thunderstorms. Waves subsiding to calm to 2 feet.

SUNDAY
West winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.



LSZ261-231545-
MAFOR 2309/
Superior West 14500 11600 11110 12220. A chance of showers
overnight. Waves 1 foot or less today building to 2 to 4 feet
tonight.

Superior North Central 12500 11510 11610 11710 11810 12120. Waves
2 feet or less today. Waves 1 to 3 feet tonight.

Superior South Central 12500 12400 11300 11810 12110. Waves 2
feet or less.

Superior East 14400 11500 11800 11810 11110. Waves 2 feet or
less.



JP

Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes