266
FZUS63 KMQT 251402
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1002 AM EDT Wed Jun 25 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...

A 30.2 inch ridge remains centered over Lake Superior today, then
slides to near southern James Bay tonight. On Thursday, a deepening
29.8 inch low lifts into the Upper Mississippi Valley, passing near
the Straits of Mackinaw on Friday. Weak 30.0 inch ridging then
resides over the lake until Saturday morning when a 29.6 inch low
passing through northern Ontario brings a 29.8 inch trough over the
lake on Sunday. 29.8 inch troughing remains over the lake through
Tuesday as a deepening low pressure dives southeast over far
northern Ontario early next week.


LSZ162-252000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1002 AM EDT Wed Jun 25 2025 /902 AM CDT Wed Jun 25 2025/

.REST OF TODAY...East winds 5 to 15 knots backing northeast in
the afternoon. A chance of showers by mid afternoon. Waves calm
to 2 feet.
.TONIGHT...Northeast winds 10 to 20 knots. A chance of showers.
Waves building to 1 to 3 feet.
.THURSDAY...Northeast winds 15 to 25 knots. A chance of showers.
Waves building to 2 to 4 feet.
.THURSDAY NIGHT...Northeast winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Showers likely through midnight,
then a chance of showers after midnight. Waves subsiding to 1 to
3 feet.
.FRIDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. A slight chance of showers through
early afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots veering west. A chance of
showers. A chance of thunderstorms. Showers likely. Waves calm to
2 feet.
.SUNDAY...Southwest winds 5 to 15 knots becoming west 10 to
20 knots. A chance of showers and thunderstorms. Waves calm to
2 feet.

$$

LSZ263-252000-
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-
1002 AM EDT Wed Jun 25 2025

.REST OF TODAY...East winds less than 10 knots becoming northeast
5 to 15 knots in the afternoon. A slight chance of showers by mid
afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots backing northeast after
midnight, then veering east late. A chance of showers. Waves
building to 1 to 3 feet.
.THURSDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. A chance of showers. Waves subsiding
to calm to 2 feet, then building to 2 to 4 feet.
.THURSDAY NIGHT...Northeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Showers likely through midnight,
then a chance of showers after midnight. Waves subsiding to 1 to
3 feet.
.FRIDAY...Northeast winds 5 to 15 knots. A slight chance of
showers through early afternoon. Waves subsiding to calm to
2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots becoming south less than
10 knots after midnight. Waves calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots veering southwest. A chance
of showers. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots veering west. A chance of
showers and thunderstorms. Waves calm to 2 feet.

$$

LSZ264-252000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1002 AM EDT Wed Jun 25 2025

.REST OF TODAY...South winds less than 10 knots increasing to
5 to 15 knots in the afternoon, then backing southeast late.
Waves calm to 2 feet.
.TONIGHT...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
in the afternoon. A slight chance of showers. Waves calm to
2 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Showers likely through midnight, then a
chance of showers after midnight. Waves building to 1 to 3 feet.
.FRIDAY...Northeast winds 5 to 15 knots backing north by mid
afternoon. A slight chance of showers through early afternoon.
Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots becoming southwest less
than 10 knots after midnight. Waves calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots veering southwest. A chance
of showers. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ265-252000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1002 AM EDT Wed Jun 25 2025

.REST OF TODAY...Southeast winds 5 to 15 knots backing east late.
Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots increasing to 10 to 20 knots
after midnight. A chance of showers. 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. A slight
chance of thunderstorms after midnight. Waves building to 1 to
3 feet.
.FRIDAY...Northeast winds 10 to 20 knots backing north by mid
afternoon. A chance of showers. Waves subsiding to calm to
2 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots becoming southwest
10 to 20 knots. A chance of showers. Waves calm to 2 feet.
.SUNDAY...Southeast winds 10 to 20 knots becoming southwest 5 to
15 knots. A chance of showers and thunderstorms. Waves calm to
2 feet.

$$

LSZ266-252000-
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-
1002 AM EDT Wed Jun 25 2025

.REST OF TODAY...South winds 5 to 15 knots backing east late.
Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots increasing to 10 to 20 knots
late. A chance of showers. 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. A slight
chance of thunderstorms after midnight. Waves building to 2 to
4 feet.
.FRIDAY...Northeast winds 10 to 20 knots backing north by mid
afternoon. A chance of showers. Waves subsiding to calm to
2 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots backing northwest after
midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots becoming south 10 to
20 knots. A chance of showers. Waves calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ267-252000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1002 AM EDT Wed Jun 25 2025

.REST OF TODAY...Northwest winds 5 to 15 knots veering north in
the afternoon. Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots veering east after
midnight, then becoming northeast 10 to 20 knots late. A chance
of showers. 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. A slight
chance of thunderstorms after midnight. Waves building to 1 to
3 feet.
.FRIDAY...East winds 10 to 20 knots backing north by mid
afternoon. Showers likely through early afternoon, then a slight
chance of showers by mid afternoon. Waves subsiding to calm to
2 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots becoming northwest
5 to 15 knots after midnight. Waves calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots becoming south 10 to
20 knots. A chance of showers. Waves calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots veering southwest. A chance
of showers. Showers likely. Waves calm to 2 feet.

$$

LSZ261-252000-
MAFOR 2515/
Superior West 11200 12100 14110 11120. A chance of showers
tonight. Waves 2 feet or less this afternoon and tonight. Waves 2
to 3 feet Thursday morning.

Superior North Central 11400 13300 13200 11210. Waves 1 foot or
less.

Superior South Central 11300 11310 11210 11200 11300 11310 12210.
A chance of showers tonight and Thursday morning. Waves 2 feet or
less.

Superior East 11600 12800 11100 12200 11100 11210. A chance of
showers overnight and Thursday morning. Waves 1 foot or less.

$$

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