587
FZUS63 KMQT 270905 CCA
GLFLS

Open Lake Forecast for Lake Superior...CORRECTED
National Weather Service Marquette MI
505 AM EDT Mon Jul 27 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 29.6 inch Clipper low skims over far western Lake Superior this
morning before departing east towards the Mid-Atlantic this evening
through Tuesday. Behind the Clipper, weak ridging of 29.9 to 30.0
inches returns to Lake Superior on Tuesday and remains until
Thursday morning. The ridging then gives way to weak troughing of
29.9 inches before becoming weak ridging of 29.9 to 30.0 inches
again the rest of this week.

LSZ162-272000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
505 AM EDT Mon Jul 27 2026 /405 AM CDT Mon Jul 27 2026/

...DENSE FOG ADVISORY IN EFFECT UNTIL NOON EDT /11 AM CDT/
TODAY...
...SEVERE THUNDERSTORM WATCH 518 IN EFFECT UNTIL 10 AM EDT /9 AM
CDT/ THIS MORNING...

.EARLY THIS MORNING...Northeast winds 10 to 20 knots. Patchy dense
fog. A chance of showers and thunderstorms. Some thunderstorms could
be severe. Waves calm to 2 feet.
.TODAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots late. Patchy dense fog early. A chance of showers and a
slight chance of thunderstorms. Some thunderstorms could be severe
early. Waves building to 1 to 3 feet, then subsiding to calm to 2
feet.
.TONIGHT...North winds 5 to 15 knots diminishing to less than
10 knots after midnight. Patchy fog. Waves calm to 2 feet.
.TUESDAY...North winds less than 10 knots veering south in the
afternoon, then becoming east 5 to 15 knots late. Patchy dense
fog through early afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Northeast winds 5 to 15 knots becoming north
less than 10 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...North winds less than 10 knots becoming east 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northeast winds 5 to 15 knots diminishing to
less than 10 knots after midnight. Waves calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots veering west. A chance
of showers and thunderstorms. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots veering north. Waves calm to
2 feet.

$$

LSZ263-272000-
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-
505 AM EDT Mon Jul 27 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL NOON EDT TODAY...
...SEVERE THUNDERSTORM WATCH 518 IN EFFECT UNTIL 10 AM EDT THIS
MORNING...

.EARLY THIS MORNING...Northeast winds 5 to 15 knots. Patchy dense fog.
A chance of showers and a slight chance of thunderstorms. Some
thunderstorms could be severe. Waves calm to 2 feet.
.TODAY...Northeast winds 10 to 20 knots. Patchy dense fog early. A
slight chance of thunderstorms through early afternoon. Some
thunderstorms could be severe early. A chance of showers. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.TONIGHT...North winds 5 to 15 knots diminishing to less than
10 knots late. Patchy fog. Waves calm to 2 feet.
.TUESDAY...Northeast winds less than 10 knots becoming south 5 to
15 knots in the afternoon. Patchy dense fog through early
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds less than 10 knots veering south
after midnight. Waves calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds less than 10 knots veering south
after midnight. Waves calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots veering west. A chance
of showers. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots veering northwest. Waves calm
to 2 feet.

$$

LSZ264-272000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
505 AM EDT Mon Jul 27 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL NOON EDT TODAY...

.EARLY THIS MORNING...Northeast winds 5 to 15 knots. Areas of
dense fog. A slight chance of showers and thunderstorms. Waves
calm to 2 feet.
.TODAY...Northeast winds 5 to 15 knots backing north late. Areas
of dense fog through early afternoon. Patchy fog by mid
afternoon. A slight chance of thunderstorms through early
afternoon. A chance of showers. Waves calm to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering north after
midnight. Patchy fog. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots becoming northwest less than
10 knots in the afternoon, then backing southwest late. Waves
calm to 2 feet.
.TUESDAY NIGHT...Southwest winds less than 10 knots backing south
after midnight. Waves calm to 2 feet.
.WEDNESDAY...South winds less than 10 knots becoming southeast
5 to 15 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots becoming south
less than 10 knots after midnight. Waves calm to 2 feet.
.THURSDAY...South winds less than 10 knots becoming west 5 to
15 knots. A chance of showers. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-272000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
505 AM EDT Mon Jul 27 2026

.EARLY THIS MORNING...North winds 5 to 15 knots. Patchy fog. A
chance of showers and a slight chance of thunderstorms. Waves
calm to 2 feet.
.TODAY...Northeast winds 10 to 20 knots backing north late.
Patchy fog. Showers likely through early afternoon. A slight
chance of thunderstorms. A chance of showers by mid afternoon.
Waves calm to 2 feet.
.TONIGHT...Northwest winds 10 to 20 knots veering north late.
Patchy fog through midnight. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots backing southeast after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots veering west. Waves
calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots backing east. Waves calm to
2 feet.

$$

LSZ266-272000-
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-
505 AM EDT Mon Jul 27 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL NOON EDT TODAY...

.EARLY THIS MORNING...North winds 5 to 15 knots. Areas of dense
fog. A slight chance of showers and thunderstorms. Waves calm to
2 feet.
.TODAY...Northeast winds 5 to 15 knots backing north in the
afternoon, then increasing to 10 to 20 knots late. Patchy dense fog
through early afternoon. A chance of showers and a slight chance of
thunderstorms. Waves calm to 2 feet.
.TONIGHT...North winds 10 to 20 knots. Patchy fog through
midnight. Waves building to 2 to 4 feet.
.TUESDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots in the afternoon, then increasing to 10 to 20 knots
late. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots backing southeast
after midnight. Waves calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...Northwest winds 5 to 15 knots veering north. Waves calm
to 2 feet.

$$

LSZ267-272000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
505 AM EDT Mon Jul 27 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL NOON EDT TODAY...

.EARLY THIS MORNING...South winds 5 to 15 knots. Areas of dense
fog. Waves calm to 2 feet.
.TODAY...East winds 5 to 15 knots backing north in the afternoon,
then becoming northwest 10 to 20 knots late. Areas of dense fog
through early afternoon. A chance of showers and thunderstorms.
Waves calm to 2 feet.
.TONIGHT...Northwest winds 10 to 20 knots becoming north 15 to
25 knots after midnight. Patchy fog through midnight. Waves
building to 2 to 4 feet.
.TUESDAY...North winds 15 to 25 knots backing northwest in the
afternoon. Waves subsiding to 1 to 3 feet, then building to 2 to
4 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots veering south. Waves
calm to 2 feet.
.FRIDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ261-271400-
MAFOR 2709/
Superior West...SEVERE THUNDERSTORM WATCH IN EFFECT...11110 11124
12120 11110 12800 11700. A chance of showers and thunderstorms
this morning. A chance of showers this afternoon. Waves 1 to 3
feet today. Waves 2 feet or less tonight.

Superior North Central 13104 11810 11700 11710 12810. A chance of
showers today. Waves 1 foot or less.

Superior South Central 11800 11200 19204 11116 11816 11810 11820
11720 11820. A chance of thunderstorms this afternoon. Waves 1 to
3 feet.

Superior East 11104 11204 11100 11800 11710 11720 12820. A chance
of showers this afternoon. Waves 1 foot or less today. Waves 1 to
3 feet building to 2 to 4 feet tonight.

$$

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