360
FZUS63 KMQT 251946
GLFLS

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

LSZ162-260400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
346 PM EDT Tue Jun 25 2024 /246 PM CDT Tue Jun 25 2024/

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

$$

LSZ263-260400-
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-
346 PM EDT Tue Jun 25 2024

.LATE THIS AFTERNOON...West winds 20 to 30 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...West winds 10 to 20 knots becoming northeast 5 to
15 knots after midnight, then increasing to 10 to 20 knots late.
A chance of showers after midnight. Waves subsiding to 1 to
3 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then veering southwest 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 becoming south 10 to
20 knots 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. Showers. Waves building
to 1 to 3 feet.
.FRIDAY NIGHT...Northeast winds 10 to 20 knots backing north
after midnight. Showers likely through midnight. A chance of
thunderstorms. A chance of showers after midnight. Waves building
to 2 to 4 feet.
.SATURDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots. Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots backing south. Waves calm
to 2 feet.

$$

LSZ264-260400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
346 PM EDT Tue Jun 25 2024

.LATE THIS AFTERNOON...West winds 20 to 30 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...North winds 10 to 20 knots becoming northeast 5 to
15 knots late. A chance of showers after midnight. Waves
subsiding to 1 to 3 feet.
.WEDNESDAY...North winds 5 to 15 knots backing west late. A
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...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots backing southeast
after midnight. A chance of showers after midnight. Waves calm to
2 feet.
.FRIDAY...Southeast winds 10 to 20 knots. Showers. Waves building
to 2 to 4 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots backing northeast
after midnight. Showers likely through midnight. A chance of
showers after midnight. Waves 2 to 4 feet.
.SATURDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots. Waves subsiding to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest. Waves calm
to 2 feet.

$$

LSZ265-260400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
346 PM EDT Tue Jun 25 2024

.LATE THIS AFTERNOON...West winds 20 to 30 knots. Waves 2 to
4 feet.
.TONIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A slight chance of showers after
midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...North winds 10 to 20 knots backing northwest late. A
chance of showers through early afternoon. Waves subsiding to
calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight, then backing west late. Waves calm
to 2 feet.
.THURSDAY...West 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. A chance of showers
through early afternoon, then showers likely by mid afternoon.
Waves building to 1 to 3 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots becoming west 15 to
25 knots after midnight. Showers likely through midnight. A
chance of showers after midnight. Waves subsiding to calm to
2 feet.
.SATURDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots becoming southwest 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ266-260400-
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-
346 PM EDT Tue Jun 25 2024

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Waves 4 to
7 feet occasionally to 9 feet subsiding to 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...Northwest winds 15 to 25 knots becoming north 10 to
20 knots after midnight. A chance of showers after midnight.
Waves subsiding to 2 to 4 feet.
.WEDNESDAY...North winds 10 to 20 knots backing northwest late. A
slight chance of showers through early afternoon. Waves subsiding
to 1 to 3 feet.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 knots. Waves 1 to
3 feet.
.THURSDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves subsiding to 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. A chance of showers
through early afternoon, then showers likely by mid afternoon.
Waves building to 2 to 4 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Showers likely through midnight. A
chance of showers after midnight. Waves 2 to 4 feet.
.SATURDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to 1 to 3 feet.
.SUNDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ267-260400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
346 PM EDT Tue Jun 25 2024

.LATE THIS AFTERNOON...West winds 20 to 30 knots. Patchy fog.
Waves 1 to 3 feet building to 2 to 4 feet.
.TONIGHT...West winds 15 to 25 knots becoming northwest 10 to
20 knots after midnight, then veering north late. Waves building
to 3 to 6 feet occasionally to 8 feet, then subsiding to 2 to
4 feet.
.WEDNESDAY...North winds 10 to 20 knots backing northwest late.
Waves subsiding to calm to 2 feet, then building to 2 to 4 feet.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 knots. Waves
subsiding to 1 to 3 feet.
.THURSDAY...West winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. A chance of showers through early
afternoon, then showers likely by mid afternoon. Waves building
to 1 to 3 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Showers. Waves building to 2 to 4 feet,
then subsiding to 1 to 3 feet.
.SATURDAY...West winds 15 to 25 knots veering northwest. A chance
of showers. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.SUNDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ261-260400-
MAFOR 2521/
Superior West 11630 11620 11810 11220 12120 11110 11300. A chance
of showers Wednesday morning. Waves 1 to 4 feet tonight through
Wednesday.

Superior North Central 11640 11720 11820 11810 12110 11810 11700.
A chance of showers Wednesday morning. Waves 3 to 6 feet
subsiding to 2 to 4 feet tonight, then to 1 to 3 feet Wednesday.

Superior South Central 11630 11720 11820 14810 11810. Waves 1 to
4 feet tonight through Wednesday.

Superior East 11630 11730 11720 14810 11710. Waves 3 to 6 feet
tonight. Waves 2 to 4 feet Wednesday.

$$

BW

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

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