357
FZUS63 KMQT 131402
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1002 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. A 29.9 inch trough will
extend northeast from this low into Lake Superior Tuesday while 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-
1002 AM EDT Sun Jul 13 2025 /902 AM CDT Sun Jul 13 2025/

.REST OF TODAY...Southwest winds 10 to 20 knots increasing to
15 to 25 knots late. Areas of smoke by late morning. Haze. A
chance of showers and a slight chance of thunderstorms by mid
afternoon. Waves 1 to 3 feet building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.TONIGHT...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then veering west late. A chance of
showers and a slight chance of thunderstorms through midnight.
Haze after midnight. 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-
1002 AM EDT Sun Jul 13 2025

.REST OF TODAY...Southwest winds 5 to 15 knots increasing to
10 to 20 knots in the afternoon. Haze and areas of smoke. 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-
1002 AM EDT Sun Jul 13 2025

.REST OF 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. 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 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-
1002 AM EDT Sun Jul 13 2025

.REST OF TODAY...Southwest winds 5 to 15 knots backing south
late. Haze. Areas of smoke by mid afternoon. Waves calm to
2 feet.
.TONIGHT...South winds 10 to 20 knots veering west late. A slight
chance of showers 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-
1002 AM EDT Sun Jul 13 2025

.REST OF TODAY...Southwest winds 10 to 20 knots backing south
late. Haze. Areas of smoke by mid afternoon. Waves 2 to 4 feet.
.TONIGHT...South 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 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-
1002 AM EDT Sun Jul 13 2025

.REST OF TODAY...Southwest winds 5 to 15 knots backing south
late. Haze. Waves 1 to 3 feet 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, then subsiding to
calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon. Haze and areas of smoke. Waves 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. A slight chance of
showers. A slight chance of thunderstorms by mid afternoon. 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.

$$

LSZ261-132000-
MAFOR 1315/
Superior West 13520 11530 11520 13610. A chance of showers this
evening. Waves 2 to 4 feet this afternoon and tonight. Waves 1 to
2 feet Monday morning.

Superior North Central 12520 11530 12520 12620 11610. Waves 2 to
4 feet.

Superior South Central 11510 11400 12410 11510 13610. Waves 2
feet or less.

Superior East 12510 12410 12520 12510. 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