329
FZUS63 KMQT 200202
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1002 PM EDT Sat Jul 19 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...

30.0 inch high pressure is moving into Lake Superior this evening.
As the high shifts towards the Lower Great Lakes through Tuesday
morning, it builds to 30.1 inches. Low pressure pushes out of the
Rockies on Tuesday. As this low moves into James Bay Wednesday, it
pulls a 29.8 inch trough through Lake Superior. Remnant troughing
of 29.9 inches remains over the lake through Thursday.


LSZ162-200800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1002 PM EDT Sat Jul 19 2025 /902 PM CDT Sat Jul 19 2025/

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

$$

LSZ263-200800-
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 PM EDT Sat Jul 19 2025

.REST OF TONIGHT...West winds 5 to 15 knots diminishing to less
than 10 knots late. Areas of smoke after midnight. Waves calm to
2 feet.
.SUNDAY...Northwest winds less than 10 knots backing south in the
afternoon, then becoming southwest 5 to 15 knots late. Areas of
smoke. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds less than 10 knots. Areas of smoke.
Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. A slight chance of showers and thunderstorms. Waves
calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots backing east by mid
afternoon. A chance of showers and thunderstorms. Waves calm to
2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. Showers and a chance of thunderstorms. Waves calm
to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-200800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1002 PM EDT Sat Jul 19 2025

.REST OF TONIGHT...West winds 5 to 15 knots veering northwest
late. Areas of smoke after midnight. Waves calm to 2 feet.
.SUNDAY...Northwest winds less than 10 knots backing southwest
late. Areas of smoke. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds less than 10 knots. Areas of smoke
through midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. A slight chance of showers after midnight. Waves calm
to 2 feet.
.TUESDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. Showers likely and a chance of thunderstorms.
Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-200800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1002 PM EDT Sat Jul 19 2025

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

$$

LSZ266-200800-
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 PM EDT Sat Jul 19 2025

.REST OF TONIGHT...Northwest winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.SUNDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...South winds 15 to 25 knots. A chance of showers
through midnight. A chance of thunderstorms. Showers likely after
midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...South winds 10 to 20 knots becoming west 5 to
15 knots. A chance of showers. Waves subsiding to calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.

$$

LSZ267-200800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1002 PM EDT Sat Jul 19 2025

.REST OF TONIGHT...Northwest winds 10 to 20 knots. Patchy fog.
Waves calm to 2 feet.
.SUNDAY...Northwest winds 5 to 15 knots becoming west 10 to
20 knots late. Waves calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots veering south by mid
afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...South winds 15 to 25 knots. A chance of showers
through midnight, then showers likely and a chance of
thunderstorms after midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...South winds 10 to 20 knots veering southwest.
Showers likely. A chance of showers. Waves subsiding to calm to
2 feet.
.THURSDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ261-200800-
MAFOR 2003/
Superior West 12600 11700 11800 11200 13300. Waves 1 foot or
less.

Superior North Central 12610 13700 13600. Waves 1 foot or less.

Superior South Central 14700 12800 11700 11500. Waves 1 foot or
less.

Superior East 16700. Waves 1 to 2 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