476
FZUS63 KMQT 302002
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Mon Jun 30 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 29.8 inch trough remains over Lake Superior through Tuesday night
as the lake becomes sandwiched between a 30.0 inch high descending
southeast over the Plains and a low over Quebec deepening from 29.6
to 29.4 inches. 30.0 inch ridging then passes southeast over the
Upper Great Lakes Thursday into Friday. Then, low pressure emerging
from the northern Rockies into central Canada brings a 29.6 inch
trough moves through Lake Superior Saturday into Sunday.


LSZ162-010800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Mon Jun 30 2025 /301 PM CDT Mon Jun 30 2025/

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Isolated
showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...West winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots backing southwest in the
afternoon. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.TUESDAY NIGHT...Southwest winds 10 to 20 knots veering west
after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots. A slight chance of
showers. A slight chance of thunderstorms by mid afternoon. Waves
calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering northeast
after midnight. Waves calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots becoming south 10 to 20 knots.
A chance of showers. A chance of thunderstorms. Showers. Waves
calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots veering west. Showers
likely. A chance of thunderstorms. A chance of showers. Waves
calm to 2 feet.

$$

LSZ263-010800-
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 Mon Jun 30 2025

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Isolated
showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight. Waves building to 1 to 3 feet.
.TUESDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon. A slight chance of showers by mid
afternoon. Waves subsiding to calm to 2 feet, then building to
2 to 4 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots late. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots. A slight chance of
showers. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots becoming northeast
less than 10 knots after midnight. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots veering south after
midnight. A chance of showers after midnight. Waves calm to
2 feet.
.FRIDAY...Southeast winds 5 to 15 knots becoming south 10 to
20 knots. A chance of showers. A chance of thunderstorms. Showers
likely. Waves building to 1 to 3 feet.
.SATURDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots. Showers likely. A chance of thunderstorms. A chance of
showers. Waves subsiding to calm to 2 feet.

$$

LSZ264-010800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Mon Jun 30 2025

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves building to 1 to 3 feet.
.TUESDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon. A slight chance of showers and
thunderstorms by mid afternoon. Waves building to 2 to 4 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...West winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots becoming north less
than 10 knots after midnight. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots veering southeast by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...Southeast winds 5 to 15 knots becoming south 10 to
20 knots. A chance of showers. A chance of thunderstorms. Showers
likely. Waves building to 1 to 3 feet.
.SATURDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots. Showers likely, then a chance of showers. Waves 1 to
3 feet.

$$

LSZ265-010800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Mon Jun 30 2025

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Isolated
showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering west after
midnight. Isolated showers through midnight. Waves building to
1 to 3 feet, then subsiding to calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots. Waves calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots. A slight chance of
showers and thunderstorms by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots veering south. A chance
of showers and thunderstorms. Waves calm to 2 feet.
.SATURDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots. Showers likely and a chance of thunderstorms, then a
chance of showers. Waves calm to 2 feet.

$$

LSZ266-010800-
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 Mon Jun 30 2025

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Isolated
showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots becoming west 10 to
20 knots after midnight. Isolated showers through midnight. Waves
building to 1 to 3 feet.
.TUESDAY...West winds 10 to 20 knots. Waves building to 2 to
4 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
1 to 3 feet.
.WEDNESDAY...West winds 10 to 20 knots. A slight chance of
showers and thunderstorms by mid afternoon. Waves subsiding to
calm to 2 feet, then building to 1 to 3 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 2 to 4 feet.
.SATURDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots. Showers likely, then a chance of showers. Waves
subsiding to 1 to 3 feet.

$$

LSZ267-010800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Mon Jun 30 2025

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots veering west late. Patchy
fog through midnight. Isolated showers. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
late. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots. Waves subsiding
to calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A slight chance of showers by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots veering north
after 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...East winds 5 to 15 knots veering southeast
after midnight. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots becoming south 15 to
25 knots. A chance of showers. Waves building to 2 to 4 feet.
.SATURDAY...South winds 10 to 20 knots veering west. Showers
likely. Waves subsiding to 1 to 3 feet.

$$

LSZ261-010200-
MAFOR 3021/
Superior West 11530 11620 14610 12520. Waves 1 to 3 feet tonight.
Waves 1 to 3 feet building to 2 to 4 feet Tuesday.

Superior North Central 12520 14610 11520 11530. Waves 1 to 3 feet
tonight. Waves 2 to 4 feet Tuesday.

Superior South Central 11500 12510 11610 11620 11610 12620. Waves
1 to 3 feet.

Superior East 12400 11500 14610 11610. 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