038
FZUS63 KMQT 132002
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM 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 29.2 inch low drifts across Hudson Bay tonight 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.


LSZ162-140800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Sun Jul 13 2025 /301 PM CDT Sun Jul 13 2025/

.LATE THIS AFTERNOON...Southwest winds 20 to 30 knots. Areas of
smoke. A slight chance of showers and thunderstorms. Waves 3 to
5 feet occasionally to 7 feet.
.TONIGHT...Southwest winds 15 to 25 knots becoming west 10 to
20 knots after midnight, then diminishing to 5 to 15 knots late.
A slight chance of showers and thunderstorms through midnight.
Areas of smoke after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...West winds 5 to 15 knots backing south late. Areas of
smoke. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots late. A chance of showers and thunderstorms. Waves calm
to 2 feet.
.TUESDAY...East winds 10 to 20 knots backing north 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...Northeast winds 10 to 20 knots. Showers likely.
Waves building to 1 to 3 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots. Showers likely.
Waves building to 2 to 4 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. A chance of showers. Waves
subsiding to calm to 2 feet.
.THURSDAY...Northeast winds 10 to 20 knots becoming west 5 to
15 knots. A chance of showers. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots veering west. Waves calm
to 2 feet.

$$

LSZ263-140800-
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 PM EDT Sun Jul 13 2025

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Areas of
smoke. A slight chance of showers and thunderstorms. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then becoming west 5 to 15 knots late. A
slight chance of showers and thunderstorms through midnight.
Areas of smoke. 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...East winds 5 to 15 knots veering south late. A
slight chance of showers and thunderstorms. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots veering northwest 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...Northeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Showers likely and a chance of
thunderstorms. Waves building to 1 to 3 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots. Showers likely.
Waves building to 2 to 4 feet.
.WEDNESDAY NIGHT...Northeast winds 5 to 15 knots. A chance of
showers. Waves subsiding to calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots backing west. Waves
calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-140800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Sun Jul 13 2025

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Areas of
smoke. Waves 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Southwest winds 10 to 20 knots becoming west 5 to
15 knots late. A slight chance of showers and thunderstorms
through midnight. Areas of smoke. 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 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 5 to 15 knots becoming northeast
10 to 20 knots after midnight. Showers likely through midnight,
then a chance of showers after midnight. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots. A chance of showers.
Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Northeast winds 5 to 15 knots backing north
after midnight. A chance of showers. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing west. Waves calm to
2 feet.
.FRIDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-140800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Sun Jul 13 2025

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Areas of
smoke. Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots becoming southwest 15 to
25 knots after midnight, then becoming west 10 to 20 knots late.
A slight chance of showers and thunderstorms through midnight.
Areas of smoke. Waves calm to 2 feet.
.MONDAY...West winds 10 to 20 knots becoming south 5 to 15 knots
late. Areas of smoke. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.TUESDAY...South winds 10 to 20 knots backing north by mid
afternoon. A chance of showers and thunderstorms. Waves calm to
2 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots. Showers likely
through midnight. A chance of thunderstorms. A chance of showers
after midnight. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. A chance of showers through early
afternoon. Showers likely by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 knots backing north
after midnight. Showers likely. Waves calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest. A
chance of showers. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots backing southwest. Waves calm
to 2 feet.

$$

LSZ266-140800-
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 PM EDT Sun Jul 13 2025

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Areas of
smoke. Waves 2 to 4 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest after
midnight. A slight chance of showers and thunderstorms through
midnight. Areas of smoke. Waves subsiding to 1 to 3 feet.
.MONDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon, then backing south late. Areas of smoke. Waves
subsiding to calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.TUESDAY...South winds 10 to 20 knots veering southwest by mid
afternoon. A chance of showers and thunderstorms. Waves calm to
2 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Showers likely through midnight. A chance of
thunderstorms. A chance of showers after midnight. Waves calm to
2 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots. A chance of showers.
Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 knots backing north
after midnight. Showers likely. Waves building to 1 to 3 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest. A
chance of showers. Waves subsiding to calm to 2 feet.
.FRIDAY...Northwest winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.

$$

LSZ267-140800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Sun Jul 13 2025

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Areas of
smoke. Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots becoming southwest 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
Areas of smoke. Waves building to 1 to 3 feet.
.MONDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. 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 veering southwest by mid
afternoon. A chance of showers and a slight chance of
thunderstorms by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 10 to 20 knots veering north
after midnight. A chance of showers and thunderstorms. Waves calm
to 2 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 knots. Showers likely
and a chance of thunderstorms. Waves building to 1 to 3 feet.
.THURSDAY...North winds 10 to 20 knots. A chance of showers.
Waves subsiding to calm to 2 feet.
.FRIDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ261-140200-
MAFOR 1321/
Superior West 11530 12520 11620 12610 11500 11510. Waves 2 to 4
feet subsiding to 1 to 3 feet tonight. Waves 2 feet or less
Monday.

Superior North Central 11530 12520 11620 13610 11510. Waves 3 to
5 feet subsiding to 2 to 4 feet tonight. Waves 1 to 3 feet
Monday.

Superior South Central 12410 12520 13610 11510. Waves 1 foot or
less.

Superior East 11410 11420 12520 11510 11610 12600. 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