550
FZUS63 KMQT 292001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Wed Apr 29 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 persists between 30.0 and 30.1 inches through early
Saturday as a 30.3 inch high slowly shifts east from the Canadian
Prairies to northwest Ontario and Hudson Bay. Weak troughing of 29.8
inches moves over the lake Saturday night and strengthens to 29.5
inches through Monday as the parent low pressure deepens to 29.4
inches over northern Ontario and James Bay.


LSZ162-300800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Wed Apr 29 2026 /301 PM CDT Wed Apr 29 2026/

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. A chance of
snow and rain showers. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots veering north late. A slight
chance of rain showers. A slight chance of snow showers after
midnight. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots veering south in the
afternoon, then veering southwest late. A slight chance of snow
showers. Waves calm to 2 feet.
.THURSDAY NIGHT...West 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...Southwest winds 5 to 15 knots veering northwest
after midnight. Waves calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots veering northwest. Waves calm
to 2 feet.
.MONDAY...West winds 10 to 20 knots. A chance of rain showers.
Waves calm to 2 feet.

$$

LSZ263-300800-
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-
401 PM EDT Wed Apr 29 2026

.LATE THIS AFTERNOON...West winds less than 10 knots. A slight
chance of rain and snow showers. Waves calm to 2 feet.
.TONIGHT...Northwest winds less than 10 knots becoming north 5 to
15 knots after midnight. A slight chance of rain and snow
showers. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots becoming west less than
10 knots late. A slight chance of snow showers. Waves calm to
2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. A slight chance of rain and snow showers through
midnight. Waves calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots backing west. A chance of
rain showers. Waves building to 1 to 3 feet.

$$

LSZ264-300800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Wed Apr 29 2026

.LATE THIS AFTERNOON...Northwest winds less than 10 knots. A
slight chance of rain and snow showers. Waves calm to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering north late.
Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing northwest late.
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...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.SATURDAY...Northwest winds 5 to 15 knots backing southwest by
mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...West winds 5 to 15 knots veering northwest. Waves calm
to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots backing west. Waves
building to 1 to 3 feet.

$$

LSZ265-300800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Wed Apr 29 2026

.LATE THIS AFTERNOON...North winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Northwest winds 5 to 15 knots increasing to 10 to
20 knots late. Waves calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots veering north
late. Waves calm to 2 feet.
.FRIDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. Waves calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.MONDAY...Northwest winds 10 to 20 knots backing west. A chance
of rain showers. Waves building to 1 to 3 feet.

$$

LSZ266-300800-
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-
401 PM EDT Wed Apr 29 2026

.LATE THIS AFTERNOON...North winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...Northwest winds 10 to 20 knots veering north late.
Waves calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest late.
Waves building to 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots veering north
after midnight, then diminishing to 10 to 20 knots late. Waves
1 to 3 feet.
.FRIDAY...North winds 15 to 25 knots backing northwest by mid
afternoon. Waves building to 2 to 4 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.SATURDAY...Northwest winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. Waves calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves calm to 2 feet.
.MONDAY...Northwest winds 10 to 20 knots increasing to 15 to
25 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.

$$

LSZ267-300800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Wed Apr 29 2026

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...Northwest winds 10 to 20 knots veering north late. A
slight chance of snow showers after midnight. Waves calm to
2 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest in the
afternoon, then increasing to 15 to 25 knots late. A slight
chance of snow showers through early afternoon. Waves building to
1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots becoming north
10 to 20 knots after midnight. Waves building to 2 to 4 feet,
then subsiding to 1 to 3 feet.
.FRIDAY...North winds 10 to 20 knots becoming northwest 15 to
25 knots by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots becoming north
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.SATURDAY...Northwest winds 15 to 25 knots backing west by mid
afternoon. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots backing southwest
after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves calm to 2 feet.
.MONDAY...West winds 10 to 20 knots becoming northwest 15 to
25 knots. A chance of rain showers. Waves building to 2 to
4 feet.

$$

LSZ261-300200-
MAFOR 2921/
Superior West 12600 11700 13800 11100 11400. Waves 1 foot or
less.

Superior North Central 12700 12710 13810 11800. Waves 2 feet or
less.

Superior South Central 11800 11700 13710 13810. Waves 2 feet or
less.

Superior East 14710 13810 11710. Waves 1 to 2 feet.

$$

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