380
FZUS63 KMQT 190203
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1002 PM EDT Wed Jun 18 2025

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...

29.6 inch low pressure is moving into Lower Michigan this evening
while a 29.7 inch trough is dropping over Lake Superior. These two
features merge into a 29.5 inch low over southern Ontario Thursday
morning while a 29.9 inch high moves over northern Ontario. Weak
29.8 inch ridging then remains over Lake Superior until Friday. On
Saturday, a 29.6 inch trough moves over Lake Superior followed by
29.7 inch troughing remaining over the lake through the rest of the
weekend.


LSZ162-190800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1002 PM EDT Wed Jun 18 2025 /902 PM CDT Wed Jun 18 2025/

.REST OF TONIGHT...South winds 5 to 15 knots backing north after
midnight. Patchy fog. A slight chance of showers after midnight.
Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots. Patchy fog through early
afternoon. A chance of showers. A slight chance of thunderstorms
by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northeast winds 5 to 15 knots. Showers likely
through midnight. A slight chance of thunderstorms. A chance of
showers after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots becoming northeast 10 to
20 knots by mid afternoon. A chance of showers. A slight chance
of thunderstorms by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Northeast winds 10 to 20 knots. Showers and a
chance of thunderstorms. Waves calm to 2 feet.
.SATURDAY...Northeast winds 10 to 20 knots. A chance of showers
and thunderstorms through early afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 10 to 20 knots. A chance of
showers and thunderstorms. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots veering west. A chance of
showers. Waves building to 1 to 3 feet, then subsiding to calm to
2 feet.
.MONDAY...West winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.

$$

LSZ263-190800-
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-
1002 PM EDT Wed Jun 18 2025

.REST OF TONIGHT...Southeast winds less than 10 knots backing
north after midnight, then increasing to 5 to 15 knots late.
Patchy fog. Waves calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots veering east late. A
chance of showers. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds less than 10 knots. Showers likely
and a slight chance of thunderstorms through midnight, then a
chance of showers after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. A chance of showers. A slight chance of thunderstorms
by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots. A chance of showers
through midnight. A chance of thunderstorms. Showers after
midnight. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. A chance of showers and thunderstorms through early
afternoon. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots veering southwest. A chance
of showers. Waves building to 1 to 3 feet.
.MONDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots.
A chance of showers. Waves subsiding to calm to 2 feet.

$$

LSZ264-190800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1002 PM EDT Wed Jun 18 2025

.REST OF TONIGHT...Southeast winds less than 10 knots backing
north after midnight, then increasing to 5 to 15 knots late.
Areas of fog. Waves calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots. Patchy fog through
early afternoon. A slight chance of showers. Waves building to
1 to 3 feet, then subsiding to calm to 2 feet.
.THURSDAY NIGHT...West winds less than 10 knots backing east
late. A chance of showers. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots. A chance of showers. A slight
chance of thunderstorms by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots. A chance of
showers through midnight. A chance of thunderstorms. Showers
after midnight. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. Showers likely through
early afternoon. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots veering southeast
after midnight. A chance of showers. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots becoming southwest 10 to
20 knots. A chance of showers. Waves building to 1 to 3 feet.
.MONDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots.
A chance of showers. Waves subsiding to calm to 2 feet.

$$

LSZ265-190800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1002 PM EDT Wed Jun 18 2025

.REST OF TONIGHT...East winds 5 to 15 knots backing northwest
after midnight, then veering north late. Areas of fog. Waves calm
to 2 feet.
.THURSDAY...North winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. Patchy fog through early afternoon. A
slight chance of showers. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots backing west
after midnight, then backing east late. A slight chance of
thunderstorms through midnight. A chance of showers. Waves calm
to 2 feet.
.FRIDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A chance of showers. A chance of
thunderstorms by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots. A chance of
showers through midnight. A chance of thunderstorms. Showers
after midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots backing east by mid
afternoon. Showers likely through early afternoon. A chance of
thunderstorms. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots. Waves calm to
2 feet.
.SUNDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. Waves calm to 2 feet.
.MONDAY...West winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.

$$

LSZ266-190800-
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-
1002 PM EDT Wed Jun 18 2025

.REST OF TONIGHT...North winds 5 to 15 knots. Patchy fog by
midnight, then areas of dense fog after midnight. Waves calm to
2 feet.
.THURSDAY...Northwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then diminishing to 5 to 15 knots
late. Haze and patchy fog through early afternoon. A slight
chance of showers by mid afternoon. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots backing southwest
late. A slight chance of thunderstorms through midnight. A chance
of showers. Waves calm to 2 feet.
.FRIDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A chance of showers. A slight chance
of thunderstorms by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots. A chance of
showers through midnight. A slight chance of thunderstorms.
Showers after midnight. Waves building to 1 to 3 feet.
.SATURDAY...South winds 10 to 20 knots backing southeast by mid
afternoon. Showers through early afternoon. A chance of
thunderstorms. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots. A chance of
showers. Waves calm to 2 feet.
.SUNDAY...South winds 15 to 25 knots. Waves building to 2 to
4 feet.
.MONDAY...West winds 10 to 20 knots becoming northwest 5 to
15 knots. A chance of showers. Waves subsiding to calm to 2 feet.

$$

LSZ267-190800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1002 PM EDT Wed Jun 18 2025

.REST OF TONIGHT...Northeast winds 5 to 15 knots backing north
after midnight, then increasing to 10 to 20 knots late. Patchy
fog by midnight, then areas of dense fog and haze after midnight.
Waves calm to 2 feet.
.THURSDAY...Northwest winds 10 to 20 knots. Haze and patchy fog
through early afternoon. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then backing southwest late. A slight
chance of thunderstorms through midnight. A chance of showers.
Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. A chance of showers. Waves calm to
2 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots. A chance of
showers through midnight. A chance of thunderstorms. Showers
after midnight. Waves building to 1 to 3 feet.
.SATURDAY...South winds 10 to 20 knots. Showers through early
afternoon. A chance of thunderstorms. A chance of showers by mid
afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots. A chance of
showers. Waves calm to 2 feet.
.SUNDAY...South winds 15 to 25 knots. Waves building to 2 to
4 feet.
.MONDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots.
A chance of showers. Waves subsiding to calm to 2 feet.

$$

LSZ261-190800-
MAFOR 1903/
Superior West 11500 11700 11100 11200 11100 12200 11106. Waves 1
foot or less.

Superior North Central 11300 11804 11800 13110 11100 11700. A
chance of showers Thursday evening. Waves 1 foot or less
overnight. Waves 1 to 3 feet Thursday and Thursday evening.

Superior South Central 11800 11804 11800 12700 12800 11700. A
chance of showers Thursday evening. Waves 2 feet or less.

Superior East 11803 11804 11800 11710 11810 11710 11700 11600. A
chance of showers Thursday evening. Waves 1 foot or less
overnight. Waves 1 to 3 feet Thursday and Thursday 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