574
FZUS63 KMQT 290201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 PM EDT Tue Apr 28 2026

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 30.0 inches this evening builds over Lake Superior
to 30.1 inches by Wednesday as a 30.3 inch high pressure sets up
shop over the Canadian Prairies and a deepening 29.6 inch low lifts
through West Virginia and Pennsylvania. High pressure ridging
gradually strengthens to 30.2 inches over the lake into Friday as
the Canadian high shifts east into northwestern Ontario and Hudson
Bay. Weak troughing of 29.9 inches moves over the lake late on
Saturday and strengthens to 29.7 inches through Sunday as the parent
low pressure deepens to 29.6 inches over northern Ontario and James
Bay.


LSZ162-290800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Tue Apr 28 2026 /901 PM CDT Tue Apr 28 2026/

.REST OF TONIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots backing southwest in
the afternoon, then veering west late. A slight chance of rain
showers. A slight chance of snow showers by mid afternoon. Waves
calm to 2 feet.
.WEDNESDAY NIGHT...North winds 5 to 15 knots increasing to 10 to
20 knots late. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots veering south by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots veering northwest.
Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots veering northwest. Waves calm
to 2 feet.

$$

LSZ263-290800-
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 Apr 28 2026

.REST OF TONIGHT...Northwest winds 5 to 15 knots. A chance of
rain showers. Waves 2 to 4 feet subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots backing west in the
afternoon. A slight chance of snow showers by mid afternoon.
Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. A slight chance of rain and snow showers through
midnight. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots veering west. Waves
calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots veering northwest. Waves calm
to 2 feet.

$$

LSZ264-290800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 PM EDT Tue Apr 28 2026

.REST OF TONIGHT...Northwest winds 5 to 15 knots. A chance of
rain showers by midnight. Waves 2 to 4 feet subsiding to calm to
2 feet.
.WEDNESDAY...North winds 5 to 15 knots backing west late. Waves
calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. A slight chance of snow showers through midnight.
Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ265-290800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EDT Tue Apr 28 2026

.REST OF TONIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves 1 to 3 feet subsiding to
calm to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots veering north in the
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...North winds 5 to 15 knots backing northwest
after midnight, then increasing to 10 to 20 knots late. Waves
calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.
.FRIDAY...North winds 15 to 25 knots backing northwest by mid
afternoon. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves 1 to 3 feet.
.SATURDAY...Northwest winds 10 to 20 knots. Waves building to
2 to 4 feet, then subsiding to calm to 2 feet.
.SUNDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.

$$

LSZ266-290800-
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 Apr 28 2026

.REST OF TONIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots late. Waves 5 to 8 feet occasionally to 10 feet
subsiding to 2 to 4 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 knots veering north
late. Waves calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves building to 2 to 4 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots veering north
after midnight. Waves 2 to 4 feet.
.FRIDAY...North winds 15 to 25 knots backing northwest by mid
afternoon. Waves building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots veering north
after midnight. Waves subsiding to 2 to 4 feet.
.SATURDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 1 to 3 feet.
.SUNDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 1 to 3 feet.

$$

LSZ267-290800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EDT Tue Apr 28 2026

.REST OF TONIGHT...Northwest winds 20 to 30 knots diminishing to
10 to 20 knots. Waves 6 to 9 feet occasionally to 11 feet
subsiding to 2 to 4 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 knots veering north
late. Waves calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots becoming northwest 15 to
25 knots by mid afternoon. Waves building to 2 to 4 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots becoming north
10 to 20 knots after midnight. Waves 2 to 4 feet.
.FRIDAY...North winds 15 to 25 knots becoming northwest 20 to
30 knots by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots becoming north
10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet.
.SATURDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 1 to 3 feet.
.SUNDAY...Northwest winds 10 to 20 knots. Waves 1 to 3 feet.

$$

LSZ261-290800-
MAFOR 2903/
Superior West 14700 11600 11500 11600 11700. Waves 2 feet or
less.

Superior North Central 11720 12710 11810 11710 11700 11600 11700.
Waves 2 to 4 feet subsiding to 1 to 3 feet overnight. Waves 2
feet or less Wednesday and Wednesday evening.

Superior South Central 12720 13710 13810. Waves 3 to 5 feet
subsiding to 2 to 4 feet overnight. Waves 1 to 3 feet Wednesday.
Waves 2 feet or less Wednesday evening.

Superior East 11730 11720 15710. Waves 5 to 8 feet overnight.
Waves 3 to 5 feet subsiding to 2 to 3 feet Wednesday. Waves
around 2 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