944
FZUS63 KMQT 070201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 PM EDT Tue May 6 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...Ridging builds in tonight thanks to a 30.5 inch high
traversing Ontario through Thursday night. Ridging over Lake
Superior will build to 30.4 inches late Wednesday, then slowly
weaken into Friday as a 30.1 inch trough approaches from the west.
This trough will pass over Lake Superior Friday night, quickly
replaced by high pressure ridging at 30.3 inches for Saturday and
Saturday night as a 30.4 inch high tracks east over Ontario. Ridging
weakens to 30.0 inches on Sunday as troughing develops to the
northwest.


LSZ162-070800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Tue May 6 2025 /901 PM CDT Tue May 6 2025/

.REST OF TONIGHT...Northeast winds 15 to 25 knots diminishing to
10 to 20 knots late. A slight chance of rain showers. Waves 2 to
4 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots veering east in the
afternoon. Waves 2 to 4 feet.
.WEDNESDAY NIGHT...Northeast winds 5 to 15 knots. Waves subsiding
to calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northeast winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots becoming northeast 5 to
15 knots. Waves calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots. Waves building to 1 to
3 feet.

$$

LSZ263-070800-
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 Tue May 6 2025

.REST OF TONIGHT...North winds 20 to 30 knots becoming northeast
15 to 25 knots after midnight, then diminishing to 10 to 20 knots
late. A slight chance of rain showers. Waves 3 to 6 feet
occasionally to 8 feet subsiding to 2 to 4 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots veering east late.
Waves 2 to 4 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots backing northeast
after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots. Waves building to 2 to
4 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots becoming north 10 to
20 knots after midnight. Waves subsiding to 1 to 3 feet.
.SATURDAY...Northeast winds 5 to 15 knots veering south. Waves
subsiding to calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots. Waves building to 1 to
3 feet.

$$

LSZ264-070800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 PM EDT Tue May 6 2025

.REST OF TONIGHT...North winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. A slight chance of rain showers.
Waves 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...North winds 5 to 15 knots veering east late.
Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots veering southeast by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...Southwest winds 10 to 20 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots becoming north 10 to
20 knots after midnight. Waves 1 to 3 feet.
.SATURDAY...Northeast winds 5 to 15 knots veering south. Waves
subsiding to calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots. Waves building to 2 to
4 feet.

$$

LSZ265-070800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EDT Tue May 6 2025

.REST OF TONIGHT...North winds 15 to 25 knots. A slight chance of
rain showers. Waves 2 to 4 feet building to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY...Northeast winds 20 to 30 knots becoming north 15 to
25 knots in the afternoon, then diminishing to 10 to 20 knots
late. Waves subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...North winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight, then becoming east 5 to 15 knots
late. Waves subsiding to calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots backing north after
midnight. Waves calm to 2 feet.
.SATURDAY...North winds 10 to 20 knots becoming south 5 to
15 knots. Waves calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots. Waves calm to 2 feet.

$$

LSZ266-070800-
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 Tue May 6 2025

.REST OF TONIGHT...North winds 20 to 30 knots diminishing to
15 to 25 knots late. A slight chance of rain showers. Waves 3 to
6 feet occasionally to 8 feet.
.WEDNESDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Waves subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight, then becoming east 5 to 15 knots late. Waves
subsiding to 1 to 3 feet.
.THURSDAY...East winds 5 to 15 knots backing north by mid
afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots backing north after
midnight. Waves building to 1 to 3 feet.
.SATURDAY...North winds 10 to 20 knots becoming south 5 to
15 knots. Waves subsiding to calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots. Waves building to 1 to
3 feet.

$$

LSZ267-070800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EDT Tue May 6 2025

.REST OF TONIGHT...Northwest winds 10 to 20 knots becoming north
15 to 25 knots after midnight. A slight chance of rain showers.
Waves calm to 2 feet building to 3 to 5 feet occasionally to
7 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots backing north in the
afternoon, then diminishing to 10 to 20 knots late. Waves
building to 3 to 6 feet occasionally to 8 feet, then subsiding to
2 to 4 feet.
.WEDNESDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. Waves subsiding to 1 to 3 feet, then building to
2 to 4 feet.
.THURSDAY...Northeast winds 10 to 20 knots becoming northwest
5 to 15 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots backing southwest
after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots backing north after
midnight. Waves calm to 2 feet.
.SATURDAY...North winds 10 to 20 knots veering southeast. Waves
calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots. Waves building to 1 to
3 feet.

$$

LSZ261-070800-
MAFOR 0703/
Superior West 11130 14120 11220 11210 11110. Waves 2 to 4 feet
building to 3 to 5 feet, then subsiding to 2 to 4 feet overnight.
Waves 2 to 4 feet Wednesday. Waves 1 to 3 feet Wednesday evening.

Superior North Central 11840 12830 11130 12120 12810. Waves 3 to
6 feet overnight. Waves 3 to 5 feet subsiding to 2 to 4 feet
Wednesday. Waves 1 to 3 feet Wednesday evening.

Superior South Central 11840 12830 11130 12820 12810. Waves 2 to
4 feet building to 4 to 7 feet overnight. Waves 3 to 6 feet
Wednesday. Waves 2 to 4 feet Wednesday evening.

Superior East 11820 12830 12130 13820. Waves 1 to 3 feet building
to 3 to 5 feet overnight. Waves 3 to 5 feet subsiding to 2 to 4
feet Wednesday. Waves 2 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