699
FZUS63 KMQT 261402
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM EDT Sat Jul 26 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...

Today, Lake Superior is between a 30.1 inch high extending across
the East Coast and a 29.5 inch low over Hudson Bay. A 29.8 inch
trough extending from the Hudson Bay low moves through western Lake
Superior this evening. Broad, weak ridging over the Great Lakes
basin builds back to near 30.0 inches inches for Sunday before a
weak 29.9 inch trough moves through the Lake Sunday night into
Monday. A high pressure near 30.3 inches builds over the Canadian
Prairies on Tuesday, bringing 30.1 inch ridging back over Lake
Superior beginning Monday night. The high will approach the western
arm of the lake by Thursday morning into Friday.


LSZ162-262000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Sat Jul 26 2025 /901 AM CDT Sat Jul 26 2025/

.REST OF TODAY...Southwest winds 5 to 15 knots backing south in
the afternoon, then veering southwest late. A slight chance of
showers and thunderstorms by mid afternoon. Waves calm to 2 feet.
.TONIGHT...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots late. A chance of showers and a slight chance of
thunderstorms through midnight. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots backing south in the
afternoon, then backing east late. A slight chance of showers and
thunderstorms by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots becoming west 10 to
20 knots after midnight. Showers likely through midnight. A
chance of thunderstorms. A chance of showers after midnight.
Waves calm to 2 feet.
.MONDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.MONDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.TUESDAY...North winds 5 to 15 knots backing northwest. Waves
calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots veering north. Waves
calm to 2 feet.

$$

LSZ263-262000-
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 Sat Jul 26 2025

.REST OF TODAY...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Southwest winds 5 to 15 knots. A slight chance of
showers and thunderstorms. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots backing east late. A
slight chance of showers and thunderstorms by mid afternoon.
Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Showers likely through midnight. A chance of
thunderstorms. A chance of showers after midnight. Waves calm to
2 feet.
.MONDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots veering northwest. Waves calm
to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ264-262000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EDT Sat Jul 26 2025

.REST OF TODAY...Southwest winds 5 to 15 knots backing south
late. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots veering west late. A chance
of showers and a slight chance of thunderstorms. Waves calm to
2 feet.
.SUNDAY...Southwest winds 5 to 15 knots backing southeast late.
Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. A chance of showers and thunderstorms. Waves calm to
2 feet.
.MONDAY...West winds 5 to 15 knots. A slight chance of showers
through early afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. Waves calm to 2 feet.
.TUESDAY...Northwest winds 5 to 15 knots backing west. Waves calm
to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-262000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EDT Sat Jul 26 2025

.REST OF TODAY...South winds 5 to 15 knots backing southeast in
the afternoon, then increasing to 10 to 20 knots late. Areas of
smoke. Waves calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering southwest after
midnight. A slight chance of showers and thunderstorms. Waves
calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing east in the afternoon.
Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. A slight chance of thunderstorms
through midnight. A chance of showers. Waves calm to 2 feet.
.MONDAY...West winds 10 to 20 knots veering northwest by mid
afternoon. A slight chance of showers. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots backing northwest. Waves
calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ266-262000-
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 Sat Jul 26 2025

.REST OF TODAY...South winds 5 to 15 knots. Areas of smoke. Waves
calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest after
midnight, then diminishing to 5 to 15 knots late. A slight chance
of showers and thunderstorms. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southeast late. Waves
calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. A chance of showers and a slight
chance of thunderstorms. Waves calm to 2 feet.
.MONDAY...West winds 10 to 20 knots. A chance of showers. A
slight chance of thunderstorms by mid afternoon. Waves calm to
2 feet.
.MONDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.TUESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ267-262000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EDT Sat Jul 26 2025

.REST OF TODAY...South winds 5 to 15 knots backing southeast in
the afternoon. Areas of smoke. Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest late.
Patchy fog after midnight. A slight chance of showers after
midnight. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing east late. Waves calm
to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. A chance of showers and a slight
chance of thunderstorms. Waves calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots veering west by mid
afternoon. A chance of showers. A slight chance of thunderstorms
by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Northwest winds 10 to 20 knots. Waves calm to
2 feet.
.TUESDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots increasing to 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ261-262000-
MAFOR 2615/
Superior West 12500 14510 11510 11500. A chance of showers and
thunderstorms tonight. Waves 1 foot or less.

Superior North Central 11510 13410 12510 11610 11500. A chance of
showers and thunderstorms this evening. Waves 1 to 2 feet.

Superior South Central 11410 13310 12510 11500 11600. Waves 2
feet or less.

Superior East 11410 12300 11310 11410 11520 11510 11600. 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