660
FZUS63 KMQT 250745
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
345 AM EDT Tue Jun 25 2024

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 29.2 inch low over far-northern Ontario will reach
James Bay by noon. This low is pushing a 29.6 inch trough across
Lake Superior through today. Behind the trough, 29.9 inch high
pressure from the High Plains will extend into the Upper Great
Lakes Wednesday. This high anchors and builds to 30.0 inches
Thursday morning over the Upper Great Lakes. A 29.4 inch low then
tracks across central Minnesota Friday enabling troughing at 29.6
inches over much of Lake Superior Friday afternoon. The low fills
and reaches eastern Lake Superior at 29.6 on early Saturday
morning. High pressure ridging at 29.9 inches shifts over the
Upper Great Lakes Saturday afternoon.

LSZ162-251545-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
345 AM EDT Tue Jun 25 2024 /245 AM CDT Tue Jun 25 2024/

.EARLY THIS MORNING...West winds 10 to 20 knots. A slight chance
of showers. Waves calm to 2 feet.
.TODAY...West winds 15 to 25 knots increasing to 20 to 30 knots
late. Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.
.TONIGHT...Northwest winds 10 to 20 knots veering east after
midnight, then backing northeast late. A slight chance of showers
and thunderstorms after midnight. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots becoming south 5 to
15 knots late. A slight chance of showers through early
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight. Waves calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
.FRIDAY...East winds 15 to 25 knots becoming northeast 10 to
20 knots. Showers. A chance of showers. Waves building to 1 to
3 feet.
.SATURDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.

$$

LSZ263-251545-
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-
345 AM EDT Tue Jun 25 2024

.EARLY THIS MORNING...Southwest winds 10 to 20 knots. A slight
chance of showers and thunderstorms. Waves 1 to 3 feet.
.TODAY...West winds 15 to 25 knots increasing to 20 to 30 knots
in the afternoon. Waves building to 3 to 6 feet occasionally to
8 feet.
.TONIGHT...North winds 10 to 20 knots veering northeast after
midnight, then diminishing to 5 to 15 knots late. A slight chance
of showers after midnight. Waves subsiding to calm to 2 feet,
then building to 1 to 3 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots backing west late. A
slight chance of showers through early afternoon. Waves subsiding
to calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Southwest winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots. A chance of
showers. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots backing east. Showers. A
chance of showers. Waves building to 2 to 4 feet, then subsiding
to 1 to 3 feet.
.SATURDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.

$$

LSZ264-251545-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
345 AM EDT Tue Jun 25 2024

.EARLY THIS MORNING...Southwest winds 10 to 20 knots. A chance of
showers and a slight chance of thunderstorms. Waves 2 to 4 feet.
.TODAY...West winds 15 to 25 knots increasing to 20 to 30 knots
in the afternoon. Waves subsiding to 1 to 3 feet, then building
to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots late. A slight chance of showers after midnight. Waves
subsiding to 1 to 3 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots backing northwest
late. A slight chance of showers through early afternoon. Waves
subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Southwest winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots. A chance of showers
after midnight. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots. Showers likely. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.SATURDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to 1 to 3 feet.

$$

LSZ265-251545-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
345 AM EDT Tue Jun 25 2024

.EARLY THIS MORNING...South winds 10 to 20 knots. A chance of
showers and a slight chance of thunderstorms. Waves 1 to 3 feet
subsiding to calm to 2 feet.
.TODAY...West winds 10 to 20 knots increasing to 20 to 30 knots.
A slight chance of showers and thunderstorms through early
afternoon. Waves building to 2 to 4 feet.
.TONIGHT...Northwest winds 15 to 25 knots becoming north 10 to
20 knots after midnight. A slight chance of showers after
midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots backing north late. A
slight chance of showers through early afternoon. Waves building
to 1 to 3 feet, then subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Southwest winds 5 to 15 knots becoming southeast
10 to 20 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves calm to 2 feet.
.FRIDAY...Southeast winds 15 to 25 knots. Showers likely. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.SATURDAY...Northwest winds 15 to 25 knots. Waves calm to 2 feet.

$$

LSZ266-251545-
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-
345 AM EDT Tue Jun 25 2024

.EARLY THIS MORNING...South winds 15 to 25 knots. A chance of
showers and thunderstorms. Waves 2 to 4 feet.
.TODAY...Southwest winds 10 to 20 knots becoming west 15 to
25 knots in the afternoon, then increasing to 20 to 30 knots
late. A slight chance of showers and thunderstorms through early
afternoon. Waves subsiding to 1 to 3 feet, then building to 3 to
6 feet occasionally to 8 feet.
.TONIGHT...Northwest winds 15 to 25 knots becoming north 10 to
20 knots after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...North winds 10 to 20 knots backing northwest late. A
slight chance of showers through early afternoon. Waves subsiding
to calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...West winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Southeast winds 15 to 25 knots becoming south 10 to
20 knots. Showers likely. Waves building to 2 to 4 feet.
.SATURDAY...Northwest winds 10 to 20 knots increasing to 15 to
25 knots. Waves subsiding to 1 to 3 feet, then building to 2 to
4 feet.

$$

LSZ267-251545-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
345 AM EDT Tue Jun 25 2024

.EARLY THIS MORNING...South winds 15 to 25 knots. A chance of
showers and thunderstorms. Waves 1 to 3 feet.
.TODAY...South winds 10 to 20 knots becoming west 15 to 25 knots
in the afternoon. A chance of showers and thunderstorms through
early afternoon. Waves building to 2 to 4 feet.
.TONIGHT...Northwest winds 15 to 25 knots becoming north 10 to
20 knots late. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 1 to 3 feet.
.WEDNESDAY...North winds 10 to 20 knots backing northwest late.
Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 knots. Waves building
to 1 to 3 feet, then subsiding to calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Southeast winds 15 to 25 knots veering south. A chance
of showers, then showers. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.SATURDAY...Northwest winds 10 to 20 knots. A chance of showers.
Waves building to 2 to 4 feet.

$$

LSZ261-251545-
MAFOR 2509/
Superior West 11520 11620 11530 12630 11720 11810 11210. Waves 1
to 3 feet building to 3 to 5 feet today. Waves 1 to 4 feet
tonight.

Superior North Central 11520 11530 11630 12640 11730 12820. A
chance of showers this morning. Waves 2 to 4 feet building to 3
to 6 feet today. Waves 3 to 6 feet subsiding to 2 to 4 feet
tonight.

Superior South Central 11420 11520 11620 12630 11730 11820 11810.
A chance of showers this morning. Waves 1 to 4 feet.

Superior East 11430 11420 11520 11620 11630 12730 11820. A chance
of showers and thunderstorms this morning. Waves 2 to 5 feet.

$$

GS

Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes