426
FZUS63 KMQT 310801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 AM EDT Fri Jul 31 2026

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 29.7 inch low pressure moving over Hudson Bay early this morning
is dragging a 29.9 inch trough over the lake. Troughing lingers over
the lake into early Saturday morning as the parent low moves into
Quebec. A 30.0 inch high will build over James Bay on Saturday,
extending a weak 29.9 inch ridge over the lake. Ridging over the
lake builds further to 30.0 inches on Sunday, lingering into Monday.
A weak trough of 29.9 inches then moves through the area on Tuesday
followed by 30.0 inch ridging on Wednesday.



LSZ162-312000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 AM EDT Fri Jul 31 2026 /300 AM CDT Fri Jul 31 2026/

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Patchy
smoke. A slight chance of showers and thunderstorms. Waves calm
to 2 feet.
.TODAY...West winds 5 to 15 knots backing southwest in the
afternoon. Patchy smoke. A chance of showers and a slight chance
of thunderstorms. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering west after
midnight, then veering northeast late. Patchy smoke through
midnight. A slight chance of showers through midnight. Waves calm
to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots veering east in the
afternoon, then backing northeast late. Waves calm to 2 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots veering northeast
after midnight. Waves calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...East winds 5 to 15 knots veering southwest. Waves calm
to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ263-312000-
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-
400 AM EDT Fri Jul 31 2026

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Patchy
smoke. A slight chance of showers and thunderstorms. Waves calm
to 2 feet.
.TODAY...West winds 5 to 15 knots backing southwest in the
afternoon, then veering west late. Patchy smoke. A chance of
showers and a slight chance of thunderstorms. Waves calm to
2 feet.
.TONIGHT...West winds 5 to 15 knots veering north late. Patchy
smoke through midnight. A slight chance of showers and
thunderstorms through midnight. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots increasing to 10 to 20 knots.
Waves building to 1 to 3 feet.
.TUESDAY...Southwest winds 10 to 20 knots veering northwest.
Waves subsiding to calm to 2 feet.

$$

LSZ264-312000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 AM EDT Fri Jul 31 2026

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Patchy
smoke. A slight chance of showers and thunderstorms. Waves calm
to 2 feet.
.TODAY...West winds 5 to 15 knots. Patchy smoke. A slight chance
of showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots veering north after midnight.
Patchy smoke through midnight. A slight chance of thunderstorms
through midnight. A slight chance of showers. Waves calm to
2 feet.
.SATURDAY...North winds 5 to 15 knots veering northeast in the
afternoon. A slight chance of showers through early afternoon.
Waves calm to 2 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots veering northeast
after midnight. Waves calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds less than 10 knots veering southeast
after midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots becoming south 10 to
20 knots. Waves calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.

$$

LSZ265-312000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 AM EDT Fri Jul 31 2026

.EARLY THIS MORNING...Southwest winds 10 to 20 knots. Patchy
smoke. A chance of showers and a slight chance of thunderstorms.
Waves calm to 2 feet.
.TODAY...Southwest winds 10 to 20 knots veering west in the
afternoon. A chance of showers. A slight chance of thunderstorms
by mid afternoon. Patchy smoke by mid afternoon. Waves calm to
2 feet.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight, then veering north late. Patchy smoke. A slight
chance of thunderstorms through midnight. A chance of showers.
Waves calm to 2 feet.
.SATURDAY...North winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. Waves calm to 2 feet.
.SUNDAY...Northeast winds 10 to 20 knots becoming north 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...North winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots becoming south 15 to
25 knots. Waves calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots veering west. A chance
of showers. Waves calm to 2 feet.

$$

LSZ266-312000-
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-
400 AM EDT Fri Jul 31 2026

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Patchy
smoke. A chance of showers and a slight chance of thunderstorms.
Waves calm to 2 feet.
.TODAY...Southwest winds 5 to 15 knots veering northwest late.
Patchy smoke. A chance of showers. A slight chance of
thunderstorms by mid afternoon. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots veering north late. Patchy
smoke. A chance of showers and a slight chance of thunderstorms.
Waves calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots increasing to 10 to
20 knots late. A chance of showers. Waves calm to 2 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. A slight chance of showers through midnight.
Waves building to 1 to 3 feet.
.SUNDAY...Northeast winds 5 to 15 knots backing north by mid
afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...North winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots becoming south 10 to
20 knots. Waves building to 1 to 3 feet.
.TUESDAY...South winds 10 to 20 knots veering west. A chance of
showers. Waves subsiding to calm to 2 feet.

$$

LSZ267-312000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 AM EDT Fri Jul 31 2026

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. A chance of
showers and a slight chance of thunderstorms. Waves calm to
2 feet.
.TODAY...Southwest winds 5 to 15 knots veering northwest late. A
slight chance of showers. A slight chance of thunderstorms by mid
afternoon. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots veering north late. Patchy
smoke. A chance of showers and a slight chance of thunderstorms.
Waves calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots increasing to 10 to
20 knots late. A chance of showers and a slight chance of
thunderstorms. Waves calm to 2 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. A chance of showers and a slight chance of
thunderstorms through midnight. Waves building to 1 to 3 feet.
.SUNDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...North winds 5 to 15 knots veering northeast after
midnight. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots veering south. Waves calm to
2 feet.
.TUESDAY...South winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ261-311400-
MAFOR 3109/
Superior West 11510 12600 14500 11800. A chance of showers today
and this evening. Waves 1 foot or less.

Superior North Central 11510 14610 12600 11800. A chance of
showers early this morning. Waves 1 to 2 feet.

Superior South Central 12510 11610 11710 11700 11500 11600 11700.
A chance of showers. Waves 1 foot or less.

Superior East 12500 11600 12700 12600 11700. A chance of showers
this morning and tonight. Waves 1 foot or less.

$$

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