971
FZUS63 KMQT 251417
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1017 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 James Bay will continue to track
eastward this afternoon. One associated trough of 29.5 inches over
Lake Superior will move east of the lake during the afternoon, and
a second trough of 29.7 inches will sweep southeast across Lake
Superior this evening. In its wake, 30.2 inch high pressure over
the Canadian Prairies Wednesday morning will weaken to 30.0 inches
as it moves southeast, reaching the Upper Mississippi Valley
Wednesday night. This high will then shift east across the Great
Lakes region on Thursday. As high builds to 30.1 inches while
moving to New England by Friday morning, 29.4 inch low pressure
will track east to the eastern Dakotas. This low will then weaken
29.6 inches as it tracks over or just north of Lake Superior
during Friday night and Saturday morning. As the low heads toward
southern Quebec on Saturday, 30.2 inch high pressure will build
over the Northern Plains.

LSZ162-252230-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1017 AM EDT Tue Jun 25 2024 /917 AM CDT Tue Jun 25 2024/

.REST OF TODAY...West winds 15 to 25 knots backing southwest in
the afternoon, then becoming west late. Waves 1 to 3 feet
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, then 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.

$$

LSZ263-252230-
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-
1017 AM EDT Tue Jun 25 2024

.REST OF TODAY...West winds 20 to 30 knots becoming southwest
in the afternoon, then veering west late. Patchy fog through late
morning. Waves 1 to 3 feet building to 3 to 6 feet occasionally
to 8 feet, then subsiding to 3 to 5 feet occasionally to 7 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,
then 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.

$$

LSZ264-252230-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1017 AM EDT Tue Jun 25 2024

.REST OF TODAY...West winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Patchy fog through early afternoon.
Waves 1 to 3 feet 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.

$$

LSZ265-252230-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1017 AM EDT Tue Jun 25 2024

.REST OF TODAY...West winds 10 to 20 knots increasing to 20 to
30 knots. Waves calm to 2 feet 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.

$$

LSZ266-252230-
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-
1017 AM EDT Tue Jun 25 2024

.REST OF TODAY...West winds 10 to 20 knots increasing to 20 to
30 knots. Patchy fog through early afternoon. Waves 1 to 3 feet
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.

$$

LSZ267-252230-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1017 AM EDT Tue Jun 25 2024

.REST OF TODAY...Southwest winds 10 to 20 knots becoming west
15 to 25 knots in the afternoon. Patchy fog through mid afternoon.
Waves 1 to 3 feet 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.

$$
LSZ261-252230-
MAFOR 2515/
Superior West 11630 11530 11630 11720 11820 11220 12120. A chance
of showers overnight and Wednesday morning. Waves 1 to 5 feet.

Superior North Central 11630 12640 11730 11830 11820 11810 11110.
Waves 2 to 6 feet this afternoon and tonight. Waves 1 to 3 feet
Wednesday morning.

Superior South Central 13630 11730 11830 12810 11110. Waves 1 to
4 feet.

Superior East 11520 12630 12730 11820 11810 11110. Waves 2 to 5
feet.

$$

Rolfson

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

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