063
FZUS63 KMQT 271402
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM EDT Mon Apr 27 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...

A 29.5 inch low over the Central Plains moves northeast today
reaching the Upper Peninsula late this evening and crosses the lake
at 29.4 inches by early Tuesday morning. The low reaches James Bay
Tuesday afternoon while 30.1 inch high pressure builds over the
Canadian Prairie. As the low departs northeast, the high builds to
30.2 inches while a 29.8 inch low passes south of the Lower Great
Lakes Wednesday. By Thursday night, the 30.2 inch high will span
from Hudson Bay to the Central Plains while low pressure of 29.5
inches will be off Cape Cod. The high then shifts directly over Lake
Superior by Saturday ahead of the arrival of a weak trough late
Saturday into Sunday.


LSZ162-272000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Mon Apr 27 2026 /901 AM CDT Mon Apr 27 2026/

.REST OF TODAY...Northeast winds 15 to 25 knots. Rain showers and
a slight chance of thunderstorms. Waves 3 to 6 feet occasionally
to 8 feet.
.TONIGHT...Northeast winds 10 to 20 knots becoming west 15 to
25 knots after midnight, then increasing to 20 to 30 knots late.
A chance of rain showers. Waves subsiding to 1 to 3 feet, then
building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...West winds 20 to 30 knots diminishing to 10 to
20 knots late. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots. Waves subsiding
to calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...North winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Northeast winds 5 to 15 knots backing north. Waves
calm to 2 feet.
.FRIDAY...Southeast winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ263-272000-
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 AM EDT Mon Apr 27 2026

.REST OF TODAY...East winds 15 to 25 knots. A chance of rain
showers by late morning. A slight chance of thunderstorms. Rain
showers by mid afternoon. Waves 2 to 4 feet building to 3 to
6 feet occasionally to 8 feet.
.TONIGHT...Southeast winds 15 to 25 knots becoming west 10 to
20 knots after midnight, then increasing to 20 to 30 knots late.
Rain showers likely through midnight, then a chance of rain
showers after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. A slight chance of rain showers
through early afternoon. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...North winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...North winds 5 to 15 knots backing northwest. Waves
calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots backing west. Waves calm to
2 feet.

$$

LSZ264-272000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EDT Mon Apr 27 2026

...GALE WARNING IN EFFECT FROM 5 PM EDT THIS AFTERNOON THROUGH
TUESDAY AFTERNOON...

.REST OF TODAY...Southeast winds 15 to 25 knots increasing to
gales to 35 knots. A chance of rain showers. A slight chance of
thunderstorms by mid afternoon. Waves 3 to 5 feet occasionally to
7 feet building to 4 to 7 feet occasionally to 9 feet.
.TONIGHT...Southeast gales to 35 knots diminishing to 20 to
30 knots after midnight, then veering west late. Rain showers and
a slight chance of thunderstorms through midnight, then a chance
of rain showers after midnight. Waves building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...West gales to 35 knots diminishing to 20 to 30 knots
late. A slight chance of rain showers through early afternoon.
Waves building to 5 to 8 feet occasionally to 10 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds less than 10 knots becoming
north 5 to 15 knots after midnight. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing northwest. Waves
calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots backing northwest. Waves calm
to 2 feet.

$$

LSZ265-272000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EDT Mon Apr 27 2026

...GALE WARNING IN EFFECT FROM 5 PM EDT THIS AFTERNOON THROUGH
TUESDAY AFTERNOON...

.REST OF TODAY...Southeast winds 20 to 30 knots increasing to
gales to 35 knots in the afternoon. A slight chance of rain
showers by late morning, then rain showers and a slight chance of
thunderstorms by mid afternoon. Waves 2 to 4 feet building to
3 to 5 feet occasionally to 7 feet.
.TONIGHT...Southeast gales to 35 knots diminishing to 20 to
30 knots after midnight, then veering west late. Rain showers and
a slight chance of thunderstorms through midnight, then a chance
of rain showers after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...West gales to 40 knots diminishing to 20 to 30 knots
late. A slight chance of rain showers through early afternoon.
Waves building to 5 to 8 feet occasionally to 10 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots. Waves calm to
2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves calm to 2 feet.
.FRIDAY...North winds 10 to 20 knots backing northwest. Waves
calm to 2 feet.

$$

LSZ266-272000-
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 AM EDT Mon Apr 27 2026

...GALE WARNING IN EFFECT FROM 3 PM EDT THIS AFTERNOON THROUGH
TUESDAY AFTERNOON...

.REST OF TODAY...Southeast winds 20 to 30 knots increasing to
gales to 40 knots in the afternoon. A chance of rain showers and
a slight chance of thunderstorms by mid afternoon. Waves 3 to
5 feet occasionally to 7 feet building to 6 to 9 feet
occasionally to 11 feet.
.TONIGHT...Southeast gales to 45 knots becoming west gales to
35 knots late. Rain showers and a slight chance of thunderstorms
through midnight, then a chance of rain showers after midnight.
Waves building to 7 to 10 feet occasionally to 13 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...West gales to 40 knots. A slight chance of rain
showers through early afternoon. Waves building to 10 to 14 feet
occasionally to 18 feet, then subsiding to 7 to 10 feet
occasionally to 13 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to 1 to 3 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
after midnight. Waves calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest. Waves
building to 1 to 3 feet.
.FRIDAY...North winds 15 to 25 knots backing northwest. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.

$$

LSZ267-272000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EDT Mon Apr 27 2026

...GALE WARNING IN EFFECT FROM 3 PM EDT THIS AFTERNOON THROUGH
TUESDAY AFTERNOON...

.REST OF TODAY...Southeast winds 20 to 30 knots increasing to
gales to 40 knots in the afternoon. A chance of rain showers by
mid afternoon. Waves 3 to 5 feet occasionally to 7 feet building
to 6 to 9 feet occasionally to 11 feet.
.TONIGHT...Southeast gales to 45 knots becoming south gales to
35 knots late. A slight chance of thunderstorms through midnight.
Rain showers likely. Waves building to 7 to 10 feet occasionally
to 13 feet, then subsiding to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...West gales to 40 knots. A chance of rain showers
through early afternoon. Waves building to 10 to 14 feet
occasionally to 18 feet, then subsiding to 9 to 12 feet
occasionally to 15 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves calm to 2 feet.
.THURSDAY...Northwest winds 10 to 20 knots veering north. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.FRIDAY...Northwest winds 15 to 25 knots veering north. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
1 to 3 feet.

$$

LSZ261-272000-
MAFOR 2715/
Superior West 11236 11136 11236 11226 11620 12630 11640. Waves 3
to 6 feet this afternoon. Waves 3 to 5 feet tonight. Waves 3 to 6
feet Tuesday morning.

Superior North Central...GALE WARNING IN EFFECT...12340 12356
11346 11430 11640 11650. Waves 3 to 6 feet building to 4 to 7
feet this afternoon. Waves 5 to 9 feet tonight and Tuesday
morning.

Superior South Central...GALE WARNING IN EFFECT...12340 12356
11340 11440 12650. Waves 3 to 6 feet this afternoon and tonight.
Waves 3 to 6 feet building to 5 to 8 feet Tuesday morning.

Superior East...GALE WARNING IN EFFECT...11340 11350 11360 12366
11356 11540 11650. Waves 3 to 6 feet building to 5 to 8 feet this
afternoon. Waves 6 to 10 feet subsiding to 5 to 8 feet tonight.
Waves 5 to 8 feet Tuesday morning.

$$

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