551
FZUS63 KMQT 031401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM EDT Fri Oct 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 30.4 inch high over the Mid-Atlantic Coast and a 30.1 inch high
crossing northern Ontario today maintain 30.0 to 30.1 inch ridging
over Lake Superior through tonight. Meanwhile, troughing over the
Plains deepens to 29.6 inches this afternoon, becoming centered over
the Dakotas tonight. This lifts towards Lake Winnipeg on Saturday
while a 29.4 inch low develops off of the Colorado Rockies. This
second low then lifts northeast on Sunday to northwestern Ontario,
quickly reaching far northern Quebec by Monday morning as it deepens
to at least 29.2 inches. This results in at least 29.8 inch
troughing over Lake Superior by Saturday, which holds until Monday
morning. In its wake, a 30.3 inch high pressure moving across the
Northern Plains brings ridging of 30.1 inches back over Lake
Superior by Monday. A reinforcing 30.3 inch high pressure dropping
down from the Canadian Prairies into the Northern Plains on Tuesday
brings 30.2 inch ridging to Lake Superior by Tuesday evening. The
high then strengthens to around 30.4 inches close to the lake
Tuesday night into Wednesday.


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

.REST OF TODAY...Northeast winds 5 to 15 knots veering east in
the afternoon, then becoming northeast 10 to 20 knots late. Waves
calm to 2 feet.
.TONIGHT...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then veering east late. Waves calm to
2 feet.
.SATURDAY...South winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Waves building to 2 to 4 feet.
.SATURDAY NIGHT...South winds 20 to 30 knots. Waves subsiding to
1 to 3 feet, then building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...South winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. A slight chance of showers by mid
afternoon. Waves building to 5 to 8 feet occasionally to 10 feet.
.SUNDAY NIGHT...Southwest winds 20 to 30 knots becoming west
15 to 25 knots after midnight. Waves subsiding to 2 to 4 feet.
.MONDAY...West winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.TUESDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots. Waves building to 1 to 3 feet, then subsiding to 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 Fri Oct 3 2025

.REST OF TODAY...North winds less than 10 knots veering northeast
in the afternoon, then becoming east 5 to 15 knots late. Waves
calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight, then becoming south 10 to 20 knots late. Waves calm to
2 feet.
.SATURDAY...South winds 15 to 25 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.SATURDAY NIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...South gales to 40 knots. A slight chance of showers by
mid afternoon. Waves building to 6 to 9 feet occasionally to
11 feet.
.SUNDAY NIGHT...Southwest gales to 35 knots becoming west 20 to
30 knots after midnight. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.MONDAY...West winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.TUESDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 1 to 3 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 Fri Oct 3 2025

.REST OF TODAY...North winds 5 to 15 knots becoming northeast
less than 10 knots in the afternoon, then becoming east 5 to
15 knots late. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight, then becoming south 10 to 20 knots late. Waves building
to 1 to 3 feet.
.SATURDAY...South winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Waves building to 2 to 4 feet.
.SATURDAY NIGHT...South winds 15 to 25 knots. Waves building to
3 to 6 feet occasionally to 8 feet.
.SUNDAY...South winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. Waves building to 5 to 8 feet
occasionally to 10 feet.
.SUNDAY NIGHT...Southwest gales to 35 knots becoming west 20 to
30 knots after midnight. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.MONDAY...West winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.TUESDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 1 to 3 feet.

$$

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

.REST OF TODAY...West winds 5 to 15 knots backing east in the
afternoon. A slight chance of showers and thunderstorms. Waves
calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight, then becoming south 10 to 20 knots late. Waves calm to
2 feet.
.SATURDAY...South winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...South winds 20 to 30 knots. Waves 1 to 3 feet.
.SUNDAY...South winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY NIGHT...South gales to 35 knots becoming west 15 to
25 knots after midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...West winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.TUESDAY...West winds 15 to 25 knots becoming north 10 to
20 knots. Waves building to 1 to 3 feet, then subsiding to 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 Fri Oct 3 2025

.REST OF TODAY...Southwest winds 5 to 15 knots backing east late.
A slight chance of showers and thunderstorms. Waves calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight, then becoming south 10 to 20 knots late. Waves building
to 1 to 3 feet.
.SATURDAY...South winds 15 to 25 knots increasing to 20 to
30 knots late. Waves building to 3 to 5 feet occasionally to
7 feet.
.SATURDAY NIGHT...South winds 20 to 30 knots. Waves building to
3 to 6 feet occasionally to 8 feet.
.SUNDAY...South winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. Waves building to 5 to 8 feet
occasionally to 10 feet.
.SUNDAY NIGHT...South gales to 35 knots becoming west 20 to
30 knots after midnight. A chance of showers. Waves building to
7 to 10 feet occasionally to 13 feet, then subsiding to 4 to
7 feet occasionally to 9 feet.
.MONDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves subsiding to 1 to 3 feet.
.TUESDAY...West winds 15 to 25 knots veering north. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.

$$

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

.REST OF TODAY...Southwest winds 10 to 20 knots diminishing to
5 to 15 knots in the afternoon, then backing east late. A slight
chance of showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots becoming southeast 10 to
20 knots after midnight. Waves calm to 2 feet.
.SATURDAY...South winds 10 to 20 knots increasing to 20 to
30 knots. Waves building to 2 to 4 feet.
.SATURDAY NIGHT...South winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY...South winds 15 to 25 knots increasing to 20 to 30 knots
by mid afternoon. Waves building to 4 to 7 feet occasionally to
9 feet.
.SUNDAY NIGHT...South gales to 35 knots becoming southwest 20 to
30 knots after midnight. Showers likely. Waves building to 5 to
8 feet occasionally to 10 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.MONDAY...Northwest winds 10 to 20 knots backing west. Waves
subsiding to calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots becoming north 15 to
25 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.

$$

LSZ261-032000-
MAFOR 0315/
Superior West 11100 11200 11110 12210 11310 11410 11420. Waves 2
feet or less.

Superior North Central 11800 11100 11200 11210 11310 11320 12420.
Waves 2 feet or less this afternoon. Waves 1 to 3 feet tonight.
Waves 1 to 3 feet building to 2 to 4 feet Saturday morning.

Superior South Central 11600 13200 11300 11310 11410 11420. Waves
2 feet or less.

Superior East 11510 11400 12200 11300 12310 11420. Waves 2 feet
or less this afternoon and tonight. Waves 1 to 3 feet Saturday
morning.

$$

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