419
FZUS63 KMQT 221344
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
944 AM EDT Tue Apr 22 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...Weak ridging of around 30.1 inches remains over Lake
Superior today into Wednesday. After weak troughing of around 30.0
inches moves over the lake late Wednesday, expect ridging to build
back up to 30.3 inches by Thursday and to continue through Friday
as high pressure moves through northern Ontario. High pressure
averaging 30.4 inches then shifts over the Upper Great Lakes
Saturday before moving into the Lower Great Lakes on Sunday.

LSZ162-222145-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
944 AM EDT Tue Apr 22 2025 /844 AM CDT Tue Apr 22 2025/

.REST OF TODAY...East winds 10 to 20 knots. A slight chance of
rain showers. Waves calm to 2 feet building to 2 to 4 feet.
.TONIGHT...East winds 10 to 20 knots backing northeast after
midnight, then diminishing to 5 to 15 knots late. A slight chance
of rain showers. Waves subsiding to calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots veering southwest in the
afternoon, then becoming west 10 to 20 knots late. A slight
chance of rain showers. Waves calm to 2 feet.
.WEDNESDAY NIGHT...North winds 5 to 15 knots. A slight chance of
rain showers through midnight. Waves calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northeast winds 10 to 20 knots. A chance of
rain showers. Waves building to 1 to 3 feet.
.FRIDAY...Northeast winds 10 to 20 knots. Waves subsiding to calm
to 2 feet.
.SATURDAY...Northeast winds 10 to 20 knots veering east. Waves
calm to 2 feet.

$$

LSZ263-222145-
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-
944 AM EDT Tue Apr 22 2025

.REST OF TODAY...East winds 5 to 15 knots. A slight chance of
rain showers by mid afternoon. Waves calm to 2 feet building to
1 to 3 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight. A chance of rain showers. Waves subsiding to calm to
2 feet.
.WEDNESDAY...South winds 5 to 15 knots veering southwest in the
afternoon. A chance of rain showers. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots. A slight chance
of rain showers through midnight. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots veering northeast by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northeast winds 5 to 15 knots. Waves building
to 1 to 3 feet.
.FRIDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.SATURDAY...Northeast winds 5 to 15 knots veering east. Waves
subsiding to calm to 2 feet.

$$

LSZ264-222145-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
944 AM EDT Tue Apr 22 2025

.REST OF TODAY...North winds 5 to 15 knots veering east in the
afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight. A slight chance of rain showers. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots veering south in the
afternoon. A chance of rain showers. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots veering northwest
after midnight. A slight chance of rain showers. Waves calm to
2 feet.
.THURSDAY...North winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.SATURDAY...Northeast winds 5 to 15 knots veering southeast.
Waves subsiding to calm to 2 feet.

$$

LSZ265-222145-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
944 AM EDT Tue Apr 22 2025

.REST OF TODAY...Northwest winds 5 to 15 knots veering east in
the afternoon, then increasing to 10 to 20 knots late. A slight
chance of rain showers by mid afternoon. Waves calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots. A slight chance of
rain showers. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots. A chance of rain
showers. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots veering west after
midnight. A chance of rain showers. Waves calm to 2 feet.
.THURSDAY...Northwest winds 10 to 20 knots veering north by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northeast winds 5 to 15 knots. A chance of rain
showers. Waves calm to 2 feet.
.FRIDAY...Northeast winds 10 to 20 knots. A chance of rain
showers. Waves building to 2 to 4 feet.
.SATURDAY...Northeast winds 10 to 20 knots becoming southeast
5 to 15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ266-222145-
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-
944 AM EDT Tue Apr 22 2025

.REST OF TODAY...Northwest winds 10 to 20 knots becoming north
5 to 15 knots in the afternoon, then veering east late. Waves
3 to 5 feet occasionally to 7 feet subsiding to calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight, then increasing to 10 to 20 knots late. A slight chance
of rain showers. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots. A chance of rain
showers. Waves building to 1 to 3 feet, then subsiding to calm to
2 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots veering west after
midnight. A chance of rain showers. Waves calm to 2 feet.
.THURSDAY...Northwest winds 10 to 20 knots veering north by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northeast winds 5 to 15 knots. A chance of rain
showers. Waves calm to 2 feet.
.FRIDAY...Northeast winds 10 to 20 knots. A chance of rain
showers. Waves building to 2 to 4 feet.
.SATURDAY...Northeast winds 10 to 20 knots becoming southeast
5 to 15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ267-222145-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
944 AM EDT Tue Apr 22 2025

.REST OF TODAY...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots late. Waves 3 to 5 feet occasionally to 7 feet
subsiding to calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots becoming southeast 10 to
20 knots late. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots. A chance of rain
showers. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots. A chance of rain
showers. Waves calm to 2 feet.
.THURSDAY...Northwest winds 10 to 20 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...Northeast winds 10 to 20 knots. A chance of
rain showers. Waves calm to 2 feet.
.FRIDAY...Northeast winds 10 to 20 knots. A chance of rain
showers. Waves building to 2 to 4 feet.
.SATURDAY...North winds 10 to 20 knots veering southeast. Waves
subsiding to calm to 2 feet.

$$
LSZ261-222145-
MAFOR 2215/
Superior West 12210 12220 12210 11200 11300. A chance of rain
showers this evening. Waves 1 to 3 feet.

Superior North Central 11100 11200 12210 12310 12320. A chance of
rain showers Wednesday morning. Waves 2 feet or less this
afternoon. Waves 1 to 3 feet tonight and Wednesday morning.

Superior South Central 11800 11200 12210 14310. Waves 1 to 3
feet.

Superior East 11710 11700 11800 11200 11210 13310. Waves 2 to 4
feet this afternoon. Waves 1 to 3 feet tonight and Wednesday
morning.

$$

TAP

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

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