253
FZUS63 KMQT 262002
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Sat Jul 26 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...

Lake Superior will be between a 30.1 inch high extending across the
East Coast and a 29.4 inch low moving east over Hudson Bay through
this evening. A 29.8 inch trough extending from the Hudson Bay low
moves through western Lake Superior this evening. Broad, weak
ridging over the Great Lakes basin builds back to near 30.0 inches
inches for Sunday before a weak 29.9 inch trough moves over the Lake
Sunday night into Monday. A high pressure near 30.3 inches builds
over the Canadian Prairies on Tuesday, bringing 30.1 inch ridging
back over Lake Superior beginning Monday night. The high will
approach the western arm of the lake by Thursday morning, slowly
shifting overhead through Friday.


LSZ162-270800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Sat Jul 26 2025 /301 PM CDT Sat Jul 26 2025/

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. A slight
chance of showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing east late. A slight
chance of showers and thunderstorms by mid afternoon. Waves calm
to 2 feet.
.SUNDAY NIGHT...East winds 10 to 20 knots veering southwest after
midnight, then veering west late. Showers likely through
midnight. A chance of thunderstorms. A chance of showers after
midnight. Waves calm to 2 feet.
.MONDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ263-270800-
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 Sat Jul 26 2025

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. A slight
chance of showers and thunderstorms. Waves 1 to 3 feet subsiding
to calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering west late. A
slight chance of showers and thunderstorms through midnight.
Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots becoming south less than
10 knots in the afternoon, then becoming east 5 to 15 knots late.
A slight chance of showers and thunderstorms by mid afternoon.
Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots veering southwest
after midnight. Showers likely and a chance of thunderstorms.
Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.WEDNESDAY...West winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-270800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Sat Jul 26 2025

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Haze. A slight
chance of showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering west late. A
slight chance of showers and thunderstorms through midnight.
Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing south in the
afternoon, then backing east late. A slight chance of showers and
thunderstorms by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots veering southwest
late. A chance of showers through midnight. A chance of
thunderstorms. Showers likely after midnight. Waves calm to
2 feet.
.MONDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. Waves calm to 2 feet.
.TUESDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...Northwest winds 5 to 15 knots backing west. Waves
calm to 2 feet.

$$

LSZ265-270800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Sat Jul 26 2025

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing east in the afternoon,
then becoming southeast 10 to 20 knots late. A slight chance of
showers and thunderstorms by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 10 to 20 knots veering southwest
late. A chance of thunderstorms through midnight. A chance of
showers. Waves calm to 2 feet.
.MONDAY...West winds 10 to 20 knots. A slight chance of showers
through early afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots backing west after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...Northwest winds 5 to 15 knots backing west. Waves
calm to 2 feet.

$$

LSZ266-270800-
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 Sat Jul 26 2025

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...South winds 5 to 15 knots veering west late. A slight
chance of showers and thunderstorms through midnight. Waves calm
to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southeast late. A
slight chance of showers and thunderstorms by mid afternoon.
Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.MONDAY...West winds 10 to 20 knots. A slight chance of showers
through early afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.TUESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...Northwest winds 5 to 15 knots backing west. Waves
calm to 2 feet.

$$

LSZ267-270800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Sat Jul 26 2025

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Haze. Waves
calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest after
midnight, then becoming west 5 to 15 knots late. Waves calm to
2 feet.
.SUNDAY...West winds 5 to 15 knots backing east late. Waves calm
to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. A chance of showers and a slight
chance of thunderstorms. Waves calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots veering west by mid
afternoon. A chance of showers. A slight chance of thunderstorms
by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Northwest winds 10 to 20 knots. Waves calm to
2 feet.
.TUESDAY...West winds 10 to 20 knots veering northwest by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots. Waves calm to
2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots. Waves calm to
2 feet.
.THURSDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ261-270200-
MAFOR 2621/
Superior West 11510 13500 11600 11500 11400 11300. Waves 1 foot
or less.

Superior North Central 11410 13510 13600 11300. Waves 1 to 2
feet.

Superior South Central 11410 12510 13600 11800 11300. Waves 2
feet or less.

Superior East 11300 11410 11520 11510 13600 11500. Waves 1 to 3
feet tonight. Waves 2 feet or less Sunday.

$$

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