973
FZUS63 KMQT 031401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM EDT Thu Jul 3 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 weak ridge of 30.0 inches builds in across the Upper Great Lakes
today. By Friday morning, the ridging will build to 30.1 inches as
it shifts over southern Ontario and the Lower Great Lakes while a
29.3 inch low over northern Saskatchewan drapes a trough of 29.7
inches over the Northern Great Plains. By Saturday, the ridge will
shift over the East Coast and as the low moves over Hudson Bay,
pressing troughing of 29.8 inches into Lake Superior. The trough
then lingers over the lake through Sunday morning, with 30.1 inch
high pressure building over the Plains. This high moves over the
Great Lakes basin for the early portions of next week.


LSZ162-032000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Thu Jul 3 2025 /901 AM CDT Thu Jul 3 2025/

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

$$

LSZ263-032000-
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 Thu Jul 3 2025

.REST OF TODAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight. A slight chance of showers and thunderstorms after
midnight. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots. A chance of showers and a
slight chance of thunderstorms. Waves calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots. A chance of
showers and thunderstorms. Waves building to 1 to 3 feet.
.SATURDAY...Southwest winds 5 to 15 knots veering west by mid
afternoon. Showers and a chance of thunderstorms. Waves subsiding
to calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots becoming north 10 to
20 knots after midnight. Showers likely through midnight, then a
chance of showers after midnight. Waves building to 1 to 3 feet.
.SUNDAY...Northeast winds 10 to 20 knots becoming west 5 to
15 knots. Waves subsiding to calm to 2 feet.
.MONDAY...East winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-032000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EDT Thu Jul 3 2025

.REST OF TODAY...East winds 5 to 15 knots veering southeast late.
Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots backing southeast late. A
slight chance of showers and thunderstorms. Waves building to
1 to 3 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. A chance of showers and thunderstorms. Waves 1 to
3 feet.
.SATURDAY...Southwest winds 5 to 15 knots veering west by mid
afternoon. Showers and a chance of thunderstorms. Waves subsiding
to calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots becoming north 10 to
20 knots after midnight. Showers likely through midnight, then a
chance of showers after midnight. Waves building to 1 to 3 feet.
.SUNDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing southeast. Waves
calm to 2 feet.

$$

LSZ265-032000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EDT Thu Jul 3 2025

.REST OF TODAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots increasing to 10 to
20 knots late. Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots. A slight chance of showers
and thunderstorms by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. A slight chance of showers and thunderstorms.
Waves calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots becoming west 15 to
25 knots by mid afternoon. A chance of showers through early
afternoon. A chance of thunderstorms. Showers likely by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots veering northwest
after midnight. Showers likely through midnight, then a chance of
showers after midnight. Waves calm to 2 feet.
.SUNDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.MONDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.

$$

LSZ266-032000-
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 Thu Jul 3 2025

.REST OF TODAY...Northeast winds 5 to 15 knots backing north in
the afternoon, then veering east late. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots increasing to 10 to
20 knots late. Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots increasing to 15 to 25 knots
late. A slight chance of showers and thunderstorms by mid
afternoon. Waves building to 1 to 3 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots. A chance of showers
and thunderstorms. Waves building to 2 to 4 feet.
.SATURDAY...South winds 10 to 20 knots veering southwest by mid
afternoon. A chance of showers through early afternoon. A chance
of thunderstorms. Showers likely by mid afternoon. Waves
subsiding to calm to 2 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots becoming north 15 to
25 knots after midnight. Showers likely through midnight, then a
chance of showers after midnight. Waves building to 1 to 3 feet.
.SUNDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.
.MONDAY...North winds 5 to 15 knots veering south. Waves calm to
2 feet.

$$

LSZ267-032000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EDT Thu Jul 3 2025

.REST OF TODAY...North winds 5 to 15 knots backing northwest in
the afternoon. Waves calm to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots backing southeast after
midnight. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots veering south late.
Waves building to 1 to 3 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots. A chance of showers
and a slight chance of thunderstorms. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.SATURDAY...South winds 10 to 20 knots veering southwest by mid
afternoon. A chance of showers. A chance of thunderstorms by mid
afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots veering northwest
after midnight. Showers through midnight. A chance of
thunderstorms. A chance of showers after midnight. Waves building
to 1 to 3 feet.
.SUNDAY...North winds 10 to 20 knots. Waves building to 2 to
4 feet, then subsiding to calm to 2 feet.
.MONDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ261-032000-
MAFOR 0315/
Superior West 12110 11120 11220 12210 11200 11300. A chance of
showers and thunderstorms Friday morning. Waves 1 to 2 feet.

Superior North Central 11200 12300 14310 11320. Waves 2 feet or
less.

Superior South Central 11100 12210 12300 13310. Waves 1 foot or
less.

Superior East 13700 11600 12300 12310. Waves 2 feet 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