777
FZUS63 KMQT 142002
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Mon Jul 14 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...

Tonight through Tuesday night, a 29.7 inch low over the High Plains
will pass a 29.9 inch trough over Lake Superior. Wednesday through
Friday, a 30.1 inch high pressure will slowly move from the Canadian
Prairie to Lake Superior, reaching the Lower Great Lakes Saturday.
Saturday evening, a 29.9 inch low pressure will move from the
Northern Plains over the lake.


LSZ162-150800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Mon Jul 14 2025 /301 PM CDT Mon Jul 14 2025/

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Areas of smoke.
Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots becoming northeast 10 to
20 knots late. Areas of smoke. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots backing north in the
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 increasing to
15 to 25 knots late. Showers and a chance of thunderstorms. Waves
building to 1 to 3 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots. Showers likely
through early afternoon. A slight chance of thunderstorms. A
chance of showers by mid afternoon. Waves building to 2 to
4 feet.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 knots backing north
after midnight. A chance of showers. Waves subsiding to calm to
2 feet.
.THURSDAY...North winds 10 to 20 knots becoming south 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing east. A chance of
showers. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots backing north. A chance
of showers. Waves calm to 2 feet.

$$

LSZ263-150800-
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 Mon Jul 14 2025

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

$$

LSZ264-150800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Mon Jul 14 2025

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

$$

LSZ265-150800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Mon Jul 14 2025

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Areas of smoke.
Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots backing east after
midnight, then veering southeast late. Areas of smoke. A slight
chance of showers and thunderstorms after midnight. Waves calm to
2 feet.
.TUESDAY...South winds 10 to 20 knots backing north late. 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. Showers likely and a
chance of thunderstorms. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Showers likely and a slight chance of
thunderstorms. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.WEDNESDAY NIGHT...North winds 10 to 20 knots. A chance of
showers. Waves calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots veering south. Waves calm to
2 feet.
.SATURDAY...South winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ266-150800-
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 Mon Jul 14 2025

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Areas of smoke.
Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots backing east after
midnight, then veering southeast late. Areas of smoke. A slight
chance of showers and thunderstorms after midnight. Waves calm to
2 feet.
.TUESDAY...South winds 10 to 20 knots veering northwest late. A
chance of showers and thunderstorms. Waves calm to 2 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then increasing to 10 to 20 knots late.
Showers likely and a chance of thunderstorms. Waves calm to
2 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots. Showers likely and a
slight chance of thunderstorms. Waves building to 1 to 3 feet.
.WEDNESDAY NIGHT...North winds 10 to 20 knots. A chance of
showers. Waves 1 to 3 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots backing west
after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing south. Waves calm
to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots veering northwest.
Waves calm to 2 feet.

$$

LSZ267-150800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Mon Jul 14 2025

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

$$

LSZ261-150200-
MAFOR 1421/
Superior West 11400 13200 11100 12200 11806. A chance of
thunderstorms overnight and Tuesday. Waves 1 foot or less.

Superior North Central 11510 11500 11400 11300 11210 11310 11510
11616. A chance of thunderstorms Tuesday. Waves 1 to 2 feet.

Superior South Central 11400 13300 11310 12410 11416. A chance of
thunderstorms Tuesday afternoon. Waves 1 foot or less.

Superior East 11400 11300 11200 11300 11310 13410. A chance of
showers and thunderstorms Tuesday. Waves 1 to 2 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