491
FZUS63 KMQT 240802
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM EDT Tue Jun 24 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...

30.2 inch ridging builds over the Upper Great Lakes today, weakening
to 30.1 inches Wednesday night. On Thursday, a deepening 29.8 inch
low lifts into the Upper Mississippi Valley and brings 29.8 inch
troughing over the lake by Friday. 29.8 inch troughing to the west
of the Great lakes on Saturday moves east through Sunday, reaching
the Upper Great Lakes by Sunday night.


LSZ162-242000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EDT Tue Jun 24 2025 /301 AM CDT Tue Jun 24 2025/

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...West winds 5 to 15 knots backing south late. Waves calm
to 2 feet.
.TONIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots backing northeast in the
afternoon. A slight chance of showers by mid afternoon. Waves
calm to 2 feet.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 knots. A chance of
showers. Waves calm to 2 feet.
.THURSDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. A chance of showers. Waves building to
2 to 4 feet.
.THURSDAY NIGHT...Northeast winds 10 to 20 knots. A chance of
showers. Waves subsiding to calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots veering southwest. Waves
calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots veering west. A chance of
showers. Waves calm to 2 feet.

$$

LSZ263-242000-
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 AM EDT Tue Jun 24 2025

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots becoming east less than
10 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...East winds less than 10 knots increasing to 5 to
15 knots in the afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. A chance of showers. Waves building to 1 to
3 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots becoming northeast
5 to 15 knots after midnight. Showers likely through midnight,
then a chance of showers after midnight. Waves subsiding to calm
to 2 feet.
.FRIDAY...North winds 5 to 15 knots backing southwest. Waves calm
to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ264-242000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 AM EDT Tue Jun 24 2025

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves 1 to
3 feet.
.TODAY...West winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.TONIGHT...West winds less than 10 knots backing southwest late.
Waves calm to 2 feet.
.WEDNESDAY...South winds less than 10 knots backing southeast in
the afternoon, then increasing to 5 to 15 knots late. Waves calm
to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots. A slight chance of
showers after midnight. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. A chance of showers. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots. Showers likely
through midnight, then a chance of showers after midnight. Waves
building to 1 to 3 feet.
.FRIDAY...North winds 5 to 15 knots backing west. Waves subsiding
to calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-242000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 AM EDT Tue Jun 24 2025

.EARLY THIS MORNING...Northwest winds 10 to 20 knots. Waves calm
to 2 feet.
.TODAY...Northwest winds 5 to 15 knots veering north in the
afternoon. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots becoming southeast less than
10 knots late. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots backing east in the
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots. A slight chance of
showers. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. A chance of showers. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots. Showers likely
through midnight, then a chance of showers after midnight. Waves
calm to 2 feet.
.FRIDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots becoming southwest
10 to 20 knots. Waves calm to 2 feet.

$$

LSZ266-242000-
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 AM EDT Tue Jun 24 2025

.EARLY THIS MORNING...Northwest winds 10 to 20 knots. Waves 1 to
3 feet.
.TODAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots late. Waves subsiding to calm to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering north late.
Waves calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots backing east in the
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northeast winds 5 to 15 knots veering east
after midnight. A slight chance of showers. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. A chance of showers. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots. Showers likely.
Waves building to 1 to 3 feet.
.FRIDAY...East winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots increasing to 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ267-242000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 AM EDT Tue Jun 24 2025

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.TODAY...Northwest winds 10 to 20 knots backing west in the
afternoon, then veering northwest late. Patchy fog through early
afternoon. Waves calm to 2 feet.
.TONIGHT...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then veering north late. Waves calm to
2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northeast winds 5 to 15 knots veering east
after midnight. A slight chance of showers after midnight. Waves
calm to 2 feet.
.THURSDAY...East winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots. Showers. Waves
building to 1 to 3 feet.
.FRIDAY...East winds 10 to 20 knots becoming west 5 to 15 knots.
A chance of showers. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ261-241400-
MAFOR 2409/
Superior West 12600 12500 11400 11300 12200. Waves 2 feet or
less.

Superior North Central 12710 15600. Waves 1 to 3 feet today.
Waves 1 foot or less tonight.

Superior South Central 12710 11700 12800 11700 11600 11700. Waves
2 feet or less.

Superior East 11710 12700 14710 11800. Waves 1 to 3 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