887
FZUS63 KMQT 130802
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM EDT Sun Jul 13 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 29.4 inch low approaching James Bay deepens further to 29.2 inches
today as it drifts northeast into Hudson Bay while 30.0 inch high
pressure builds just south of the Great Lakes basin. On Monday, weak
ridging near 30.0 inches builds over Lake Superior as 29.7 inch low
pressure forms over the High Plains. This low will pass a 29.9 inch
trough over Lake Superior Tuesday before 30.1 inch high pressure
builds in its wake over northern Ontario Wednesday into Thursday.


LSZ162-132000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EDT Sun Jul 13 2025 /301 AM CDT Sun Jul 13 2025/

.EARLY THIS MORNING...Southwest winds 10 to 20 knots. Haze. Waves
1 to 3 feet.
.TODAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots late. Haze. A chance of showers and a slight chance of
thunderstorms by mid afternoon. Waves building to 2 to 4 feet,
then subsiding to 1 to 3 feet.
.TONIGHT...Southwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. A chance of showers and a slight chance
of thunderstorms through midnight. Haze. Waves subsiding to calm
to 2 feet.
.MONDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots in the afternoon, then backing south late. Areas of
smoke. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots veering west by mid
afternoon. A chance of showers through early afternoon. A chance
of thunderstorms. Showers likely by mid afternoon. Waves calm to
2 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. Showers likely and a chance of thunderstorms.
Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots becoming north 10 to
20 knots. A chance of showers. Waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots becoming west 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ263-132000-
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-
401 AM EDT Sun Jul 13 2025

.EARLY THIS MORNING...West winds 10 to 20 knots. Haze. Waves 2 to
4 feet.
.TODAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. Haze. Areas of smoke by mid afternoon.
A slight chance of showers and thunderstorms by mid afternoon.
Waves 2 to 4 feet.
.TONIGHT...Southwest winds 10 to 20 knots becoming west 5 to
15 knots late. Haze through midnight. A slight chance of showers
and thunderstorms through midnight. Waves subsiding to 1 to
3 feet.
.MONDAY...West winds 5 to 15 knots backing southwest in the
afternoon. Areas of smoke. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots. A chance of
showers. A slight chance of thunderstorms after midnight. Waves
calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots veering southwest by mid
afternoon. A chance of showers through early afternoon. A chance
of thunderstorms. Showers likely by mid afternoon. Waves calm to
2 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight. Showers likely. Waves calm to
2 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots becoming north 5 to
15 knots. A chance of showers. Waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.

$$

LSZ264-132000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 AM EDT Sun Jul 13 2025

.EARLY THIS MORNING...West winds 10 to 20 knots. Haze. Waves 2 to
4 feet.
.TODAY...Southwest winds 10 to 20 knots. Haze. Areas of smoke by
mid afternoon. A slight chance of showers by mid afternoon. Waves
2 to 4 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering west late. A
slight chance of showers and thunderstorms through midnight.
Haze. Waves subsiding to 1 to 3 feet.
.MONDAY...West winds 5 to 15 knots backing southwest in the
afternoon. Areas of smoke. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots. A slight chance of
showers and thunderstorms after midnight. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots. Showers likely. Waves
calm to 2 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots becoming north 5 to
15 knots. A chance of showers. Waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing west. Waves calm to
2 feet.

$$

LSZ265-132000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 AM EDT Sun Jul 13 2025

.EARLY THIS MORNING...West winds 10 to 20 knots. Haze. Waves 1 to
3 feet.
.TODAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots late. Haze. Areas of smoke by mid afternoon. Waves
subsiding to calm to 2 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering west late. A
slight chance of showers and thunderstorms through midnight.
Areas of smoke through midnight. Haze. Waves calm to 2 feet.
.MONDAY...West winds 10 to 20 knots becoming east 5 to 15 knots
late. Areas of smoke. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots. A slight chance of
showers after midnight. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 10 to 20 knots veering north
after midnight. Showers likely. Waves calm to 2 feet.
.WEDNESDAY...North winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots backing west. Waves calm
to 2 feet.

$$

LSZ266-132000-
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-
401 AM EDT Sun Jul 13 2025

.EARLY THIS MORNING...West winds 10 to 20 knots. Haze. Waves 2 to
4 feet.
.TODAY...Southwest winds 10 to 20 knots backing south late. Haze.
Waves subsiding to 1 to 3 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest after
midnight. A slight chance of showers and thunderstorms through
midnight. Haze. Waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.
.MONDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. Haze through early afternoon. Areas of smoke.
Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots. A slight chance of
showers after midnight. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots backing north after
midnight. Showers likely. Waves building to 1 to 3 feet.
.WEDNESDAY...North winds 10 to 20 knots. A chance of showers.
Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.
.THURSDAY...North winds 10 to 20 knots becoming west 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ267-132000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 AM EDT Sun Jul 13 2025

.EARLY THIS MORNING...West winds 10 to 20 knots. Haze. Waves calm
to 2 feet building to 1 to 3 feet.
.TODAY...Southwest winds 5 to 15 knots backing south late. Haze.
Waves subsiding to calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest after
midnight. Haze. A slight chance of showers and thunderstorms
after midnight. Waves building to 1 to 3 feet.
.MONDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon. Haze and areas of smoke. Waves
subsiding to calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots. A chance of showers
and thunderstorms. Waves calm to 2 feet.
.WEDNESDAY...North winds 10 to 20 knots. A chance of showers.
Waves building to 1 to 3 feet.
.THURSDAY...Northwest winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.

$$

LSZ261-131400-
MAFOR 1309/
Superior West 14520 11520 11530 11520 11610. A chance of showers
this evening. Waves 2 to 4 feet.

Superior North Central 11620 13520 11530 12520 11620. Waves 2 to
4 feet.

Superior South Central 12610 11510 11400 12410 12510. Waves 1 to
3 feet.

Superior East 14510 12410 12520. 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