361
FZUS63 KMQT 022002
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
402 PM EDT Sat Aug 2 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 30.3 inch high pressure over the western Great Lakes will weaken
to 30.2 inches this evening before shifting to the Lower Great Lakes
and east Sunday. By midday Monday, that high will be replaced by a
high building to 30.3 inches over James Bay. Tuesday, this high
builds to 30.4 inches over Quebec while 29.8 inch troughing is over
the High Plains. Wednesday, the high further builds to 30.5 inches
with both features remaining largely stationary. Thursday, a low of
29.7 inches emerges over Manitoba while the high weakens to 30.3
inches off the New England coast.


LSZ162-030800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
402 PM EDT Sat Aug 2 2025 /302 PM CDT Sat Aug 2 2025/

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Haze. Waves
1 to 3 feet.
.TONIGHT...Southwest winds 5 to 15 knots. Haze through midnight.
Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots backing east late. Waves
calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots. A slight chance of showers.
Waves calm to 2 feet.
.MONDAY NIGHT...East winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots veering southwest. A
chance of showers and thunderstorms. Waves calm to 2 feet.
.THURSDAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ263-030800-
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-
402 PM EDT Sat Aug 2 2025

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves 1 to
3 feet building to 2 to 4 feet.
.TONIGHT...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Haze through midnight. Waves subsiding
to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots becoming south less
than 10 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots veering south. A
chance of showers. A chance of thunderstorms. Waves calm to
2 feet.
.THURSDAY...Southwest winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ264-030800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
402 PM EDT Sat Aug 2 2025

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves 1 to
3 feet building to 2 to 4 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering west after
midnight, then diminishing to 5 to 15 knots late. Haze through
midnight. Waves subsiding to 1 to 3 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves 1 to 3 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots becoming south less
than 10 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots veering south. A
chance of showers and thunderstorms. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.

$$

LSZ265-030800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
402 PM EDT Sat Aug 2 2025

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Haze. Waves calm
to 2 feet.
.TONIGHT...West winds 5 to 15 knots backing southwest after
midnight, then becoming west 10 to 20 knots late. Haze through
midnight. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southeast late. Waves
calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. 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 5 to 15 knots. Waves calm to
2 feet.
.TUESDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 10 to 20 knots. Waves calm to
2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots veering south. A
chance of showers and thunderstorms. Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ266-030800-
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-
402 PM EDT Sat Aug 2 2025

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Haze. Waves
1 to 3 feet.
.TONIGHT...West winds 5 to 15 knots backing southwest after
midnight, then becoming west 10 to 20 knots late. Haze. Waves
1 to 3 feet.
.SUNDAY...West winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight, then backing southeast late. Haze 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...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 10 to 20 knots. Waves calm to
2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots veering south. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ267-030800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
402 PM EDT Sat Aug 2 2025

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Haze. Waves calm
to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering west late. Haze.
Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots. Haze through early afternoon.
Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots backing southeast late.
Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots backing east by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 10 to 20 knots. Waves calm to
2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots. Waves calm to
2 feet.
.THURSDAY...South winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ261-030200-
MAFOR 0221/
Superior West 15510 12500. Waves 2 feet or less.

Superior North Central 13520 11620 13610 11510. Waves 2 to 4
feet.

Superior South Central 11700 11600 12510 13610 11700. Waves 2
feet or less.

Superior East 11600 11500 12510 14610. 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