345
FZUS63 KMQT 010201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 PM 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...

This evening, a 29.7 inch low is over eastern Iowa while a 30.0 inch
high is over Manitoba. Through the weekend, the high shifts over
northern Ontario while the low shifts south of the Great Lakes. By
Sunday night, the 30.0 inch high over northeast Ontario and James
Bay will extend 29.9 inch ridging over the lake while the low moves
over the Appalachian Range at 29.8 inches. Meanwhile, a 29.3 inch
low will move from Saskatchewan into northern Manitoba Sunday night
into Monday morning. By Monday night, this low will force the 30.0
inch high over the Great Lakes as the low weakens to 29.5 inches
over western Hudson Bay. Tuesday, the high builds to 30.1 inches as
it moves over the East Coast while the low expands over the rest of
Hudson Bay. Wednesday and Thursday, the high merges with a 30.3 inch
Bermuda High, sending a 30.0 inch ridge over Lake Superior while the
low retrogrades back to northern Manitoba, weakening to 29.6 inches.



LSZ162-010800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Fri Jul 31 2026 /901 PM CDT Fri Jul 31 2026/

.REST OF TONIGHT...Southwest winds 5 to 15 knots veering west
after midnight, then veering north late. Patchy smoke. Patchy fog
after midnight. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots veering east in the
afternoon, then backing northeast late. A slight chance of
showers by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots veering northeast
late. Waves calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots veering southwest
after midnight. A chance of showers after midnight. Waves calm to
2 feet.
.TUESDAY...Southwest winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots veering northwest.
Waves calm to 2 feet.

$$

LSZ263-010800-
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-
1001 PM EDT Fri Jul 31 2026

.REST OF TONIGHT...Southwest winds 5 to 15 knots veering west
after midnight, then veering north late. A slight chance of
showers and thunderstorms by midnight. Patchy fog and smoke.
Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. Waves building to 1 to 3 feet, then
subsiding to 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 5 to 15 knots becoming southeast less
than 10 knots after midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds less than 10 knots becoming east 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ264-010800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 PM EDT Fri Jul 31 2026

.REST OF TONIGHT...West winds 5 to 15 knots veering north late.
Patchy fog. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots. Patchy fog 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 backing north by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots becoming southeast
less than 10 knots after midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-010800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EDT Fri Jul 31 2026

.REST OF TONIGHT...Southwest winds 10 to 20 knots becoming west
5 to 15 knots after midnight, then becoming northwest 10 to
20 knots late. A slight chance of showers and thunderstorms by
midnight. Patchy smoke. Patchy fog after midnight. Waves calm to
2 feet.
.SATURDAY...North winds 10 to 20 knots. Patchy fog through early
afternoon. A slight chance of showers. Waves calm to 2 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots veering northeast
late. 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 east after
midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots veering west. A chance of
showers. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots backing west. Waves
calm to 2 feet.

$$

LSZ266-010800-
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-
1001 PM EDT Fri Jul 31 2026

.REST OF TONIGHT...West winds 5 to 15 knots veering northwest
late. Patchy fog. A slight chance of thunderstorms by midnight. A
chance of showers. Waves calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots becoming northeast 10 to
20 knots in the afternoon, then backing north late. Patchy fog
through early afternoon. A slight chance of showers. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. Waves building to 1 to 3 feet.
.SUNDAY...Northeast winds 10 to 20 knots becoming north 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...North winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots becoming west 10 to
20 knots. A chance of showers. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots backing west. Waves
calm to 2 feet.

$$

LSZ267-010800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EDT Fri Jul 31 2026

.REST OF TONIGHT...West winds 5 to 15 knots veering northwest
late. Patchy smoke by midnight. Areas of dense fog. Showers
likely by midnight. A slight chance of thunderstorms. A chance of
showers after midnight. Waves calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots veering northeast in the
afternoon, then becoming north 10 to 20 knots late. Patchy fog
through early afternoon. A chance of showers and a slight chance
of thunderstorms. Waves building to 1 to 3 feet, then subsiding
to calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 10 to 20 knots. Waves building
to 1 to 3 feet.
.SUNDAY...North winds 10 to 20 knots. 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...Northeast winds 5 to 15 knots backing north by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots veering south. A chance
of showers. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ261-010800-
MAFOR 0103/
Superior West 11500 11700 13110 11210 11110 11810. Waves 2 feet
or less.

Superior North Central 11600 11710 11810 12120 12110 11810. Waves
1 to 3 feet.

Superior South Central 11500 11600 11700 14810 11810. A chance of
showers overnight and Saturday. Waves 2 feet or less.

Superior East 11603 11704 12800 14110. A chance of showers
overnight and Saturday morning. Waves 1 foot or less overnight.
Waves 1 foot or less building to 1 to 3 feet Saturday and
Saturday evening.

$$

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