490
FZUS63 KMQT 190301
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 PM EST Tue Nov 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...

High pressure averaging 30.2 inches persists over Lake Superior as a
28.9 inch low lifts away from Labrador. 30.2 inch ridging continues
to encompass the Great Lakes basin Wednesday, shifting into New
England Wednesday night and Thursday as a 29.7 inch low develops
over far northern Ontario. High pressure ridging of around 30.1
inches develops over the Northern Plains and Upper Midwest on Friday
before moving into the Great Lakes region by Saturday. Meanwhile,
troughing of 29.8 inches moves over Lake Superior on Saturday before
weakening to 29.9 inches over the lake by Sunday. Another high
pressure of around 30.2 inches builds over the Northern Plains
Sunday night before moving into the western Great Lakes Monday
evening.


LSZ162-190900-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EST Tue Nov 18 2025 /901 PM CST Tue Nov 18 2025/

.REST OF TONIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots. A slight chance of rain showers in the afternoon. Waves
building to 1 to 3 feet.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots by midnight, then diminishing to 10 to 20 knots
late. A chance of rain showers in the evening, then rain showers
likely after midnight. Waves building to 2 to 4 feet.
.THURSDAY...West winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. A chance of rain showers in the
morning. Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves 1 to 3 feet.
.FRIDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots backing southwest after
midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots veering west. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots. Waves calm to 2 feet.

$$

LSZ263-190900-
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 EST Tue Nov 18 2025

.REST OF TONIGHT...West winds less than 10 knots becoming
southwest 5 to 15 knots late. Waves calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots. Waves building to 1 to 3 feet.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots by midnight. A chance of rain showers. Waves
building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...Southwest winds 15 to 25 knots veering west in the
afternoon. Rain showers likely in the morning, then a slight
chance of rain showers in the afternoon. Waves 3 to 5 feet
occasionally to 7 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots. Waves 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots in the afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots backing southwest after
midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.

$$

LSZ264-190900-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 PM EST Tue Nov 18 2025

.REST OF TONIGHT...West winds less than 10 knots increasing to
5 to 15 knots by midnight. Waves calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots by midnight. A chance of rain showers. Waves
building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...Southwest winds 15 to 25 knots veering west in the
afternoon. Rain showers in the morning, then a chance of rain
showers in the afternoon. Waves 3 to 5 feet occasionally to
7 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots backing west
after midnight. Waves building to 3 to 6 feet occasionally to
8 feet.
.FRIDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Waves subsiding to 1 to 3 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots backing southwest
after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots. Waves building to 2 to 4 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to 1 to 3 feet.

$$

LSZ265-190900-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EST Tue Nov 18 2025

.REST OF TONIGHT...Northwest winds 5 to 15 knots backing west by
midnight. Waves calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots by midnight. A chance of rain showers after
midnight. Waves calm to 2 feet.
.THURSDAY...Southwest winds 15 to 25 knots becoming west 20 to
30 knots in the afternoon. Rain showers likely. Waves building to
2 to 4 feet.
.THURSDAY NIGHT...West winds 20 to 30 knots. A slight chance of
rain showers in the evening. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots backing southwest
after midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots becoming west 15 to
25 knots. Waves calm to 2 feet.
.SUNDAY...West winds 15 to 25 knots. Waves calm to 2 feet.

$$

LSZ266-190900-
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 EST Tue Nov 18 2025

.REST OF TONIGHT...Northwest winds 5 to 15 knots backing west by
midnight. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots backing southwest by late
morning, then increasing to 10 to 20 knots by mid afternoon.
Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots by midnight. A chance of rain showers after
midnight. Waves building to 2 to 4 feet.
.THURSDAY...Southwest winds 15 to 25 knots becoming west 20 to
30 knots in the afternoon. Rain showers. Waves building to 3 to
6 feet occasionally to 8 feet.
.THURSDAY NIGHT...Northwest winds 20 to 30 knots. A chance of
rain showers. Waves building to 4 to 7 feet occasionally to
9 feet.
.FRIDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. A chance of rain showers in the
morning. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots backing southwest
after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots becoming west 15 to
25 knots. A chance of rain showers. Waves building to 2 to
4 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of rain showers. Waves subsiding to 1 to
3 feet.

$$

LSZ267-190900-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EST Tue Nov 18 2025

.REST OF TONIGHT...Northwest winds 10 to 20 knots backing west
late. Waves calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots backing southwest. Waves
calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots by midnight. A slight chance of rain showers after
midnight. Waves building to 2 to 4 feet.
.THURSDAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Rain showers. Waves building to 3 to
5 feet occasionally to 7 feet.
.THURSDAY NIGHT...West winds 20 to 30 knots veering northwest
after midnight. Rain showers likely in the evening, then a chance
of rain showers after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet.
.FRIDAY...Northwest winds 20 to 30 knots. A chance of rain and
snow showers. Waves building to 5 to 8 feet occasionally to
10 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots backing west after
midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots becoming west 15 to
25 knots. A chance of rain showers. Waves building to 2 to
4 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of rain showers. Waves 2 to 4 feet.

$$

LSZ261-190900-
MAFOR 1904/
Superior West 13500 14510 11520. A chance of showers Wednesday
evening. Waves 2 feet or less overnight and Wednesday. Waves 1 to
3 feet Wednesday evening.

Superior North Central 13600 11510 14520. Waves 1 foot or less
overnight. Waves 1 to 3 feet Wednesday. Waves 1 to 3 feet
building to 2 to 4 feet Wednesday evening.

Superior South Central 13600 13500 11510 11520. Waves 2 feet or
less.

Superior East 11700 12600 11610 13510 11520. Waves 2 feet or less
overnight and Wednesday. Waves 1 to 3 feet Wednesday 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