668
FZUS63 KMQT 190137
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
937 PM EDT Tue Jun 18 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 broad 29.6 inch low is over northern Ontario
tonight, eventually reaching James Bay Wednesday morning as it
pulls a 29.7 inch trough over Lake Superior. As the low lifts
northeast, high pressure to 30.4 inches builds over Lake Superior
for Thursday and Friday. By Friday night, the high weakens to 30.2
inches and slides east. Low pressure of at least 29.7 inches
lifts off of the Colorado Rockies Friday night and brings
troughing of around 29.6 inches over Lake Superior Saturday as the
low moves into Canada. The troughing over Lake Superior deepens
to at least 29.5 inches by Sunday as the low strengthens over
northern Ontario.

LSZ162-190945-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
937 PM EDT Tue Jun 18 2024 /837 PM CDT Tue Jun 18 2024/

...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM EDT /7 AM CDT/
WEDNESDAY...

.REST OF TONIGHT...South winds 15 to 25 knots becoming west 20 to
30 knots late. Patchy dense fog. Showers with thunderstorms
likely by late evening. A chance of showers and thunderstorms
after midnight. Waves 1 to 3 feet building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then backing southwest late. Waves
building to 3 to 6 feet occasionally to 8 feet, then subsiding to
calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north late.
Waves calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A slight chance of showers by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northeast winds 5 to 15 knots. A chance of
showers after midnight. Waves calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Showers and a chance of thunderstorms.
Waves building to 1 to 3 feet.
.FRIDAY NIGHT...Northeast winds 10 to 20 knots. Showers and a
chance of thunderstorms. Waves 1 to 3 feet.
.SATURDAY...Northeast winds 15 to 25 knots backing west. Showers.
A chance of thunderstorms. A chance of showers. Waves building to
2 to 4 feet, then subsiding to 1 to 3 feet.
.SUNDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots. A chance of showers. Waves subsiding to calm to 2 feet.

$$

LSZ263-190945-
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-
937 PM EDT Tue Jun 18 2024

...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM EDT WEDNESDAY...

.REST OF TONIGHT...Southwest winds 10 to 20 knots becoming south
15 to 25 knots after midnight, then veering southwest late.
Patchy dense fog. Showers by late evening. A chance of
thunderstorms. A chance of showers after midnight. Waves 1 to
3 feet building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north late.
Waves subsiding to calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots veering east by mid
afternoon. A slight chance of showers by mid afternoon. Waves
calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots. A chance of showers through
early afternoon. Showers likely by mid afternoon. Waves calm to
2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots. Showers and a chance of
thunderstorms. Waves building to 1 to 3 feet.
.SATURDAY...East winds 10 to 20 knots veering west. Showers and a
chance of thunderstorms. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 1 to 3 feet.

$$

LSZ264-190945-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
937 PM EDT Tue Jun 18 2024

...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM EDT WEDNESDAY...

.REST OF TONIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots late. Areas of dense fog. Showers likely by late
evening. A chance of thunderstorms. A chance of showers after
midnight. Waves 4 to 7 feet occasionally to 9 feet subsiding to
3 to 5 feet occasionally to 7 feet, then building to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots late. Patchy fog through early afternoon. Waves building
to 4 to 7 feet occasionally to 9 feet, then subsiding to 2 to
4 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots becoming northwest
less than 10 knots late. Waves subsiding to calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds less than 10 knots backing
southeast after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots. A chance of showers
through midnight. A chance of thunderstorms. Showers likely after
midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots veering west. Showers
and a chance of thunderstorms. Waves building to 2 to 4 feet.
.SUNDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 1 to 3 feet.

$$

LSZ265-190945-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
937 PM EDT Tue Jun 18 2024

.REST OF TONIGHT...South winds 15 to 25 knots. A chance of
showers and thunderstorms. Patchy fog after midnight. Waves 3 to
6 feet occasionally to 8 feet subsiding to 1 to 3 feet.
.WEDNESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots late. A slight chance of showers and thunderstorms
through early afternoon. Waves building to 2 to 4 feet, then
subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots backing west
after midnight, then veering northwest late. Waves calm to
2 feet.
.THURSDAY...North winds 5 to 15 knots veering northeast by mid
afternoon. A slight chance of showers by mid afternoon. Waves
calm to 2 feet.
.THURSDAY NIGHT...Southeast winds less than 10 knots backing east
after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Showers and a chance of thunderstorms. Waves calm to
2 feet.
.SATURDAY...Southeast winds 10 to 20 knots becoming west 15 to
25 knots. Showers and a chance of thunderstorms. Waves calm to
2 feet.
.SUNDAY...West winds 15 to 25 knots veering northwest. A chance
of showers. Waves calm to 2 feet.

$$

LSZ266-190945-
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-
937 PM EDT Tue Jun 18 2024

.REST OF TONIGHT...South winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Patchy fog. A chance of showers
and thunderstorms. Waves 4 to 7 feet occasionally to 9 feet
subsiding to 2 to 4 feet.
.WEDNESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots late. A slight chance of showers and thunderstorms.
Waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots. Waves subsiding
to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots. A slight chance of showers
by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...North winds less than 10 knots. Waves calm to
2 feet.
.FRIDAY...East winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. A chance of showers through midnight. A chance of
thunderstorms. Showers after midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots veering west. Showers
and a chance of thunderstorms. Waves building to 2 to 4 feet.
.SUNDAY...West winds 15 to 25 knots veering northwest. A chance
of showers. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet.

$$

LSZ267-190945-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
937 PM EDT Tue Jun 18 2024

.REST OF TONIGHT...South winds 15 to 25 knots. A chance of
showers and thunderstorms. Waves 3 to 5 feet occasionally to
7 feet subsiding to 2 to 4 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots veering west in the
afternoon, then becoming northwest 10 to 20 knots late. A chance
of showers and thunderstorms. Waves 2 to 4 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots. Waves subsiding
to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots becoming northwest 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...North winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...East winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots becoming southeast 10 to
20 knots after midnight. A chance of showers through midnight.
Showers likely after midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots veering south. Showers
and a chance of thunderstorms. Waves building to 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots. A chance of showers. Waves building to 2 to 4 feet.

$$
LSZ261-190945-
MAFOR 1903/
Superior West 11439 19434 11530 19534 12630 12620 12510. Waves 1
to 3 feet building to 3 to 5 feet overnight. Waves 3 to 6 feet
subsiding to 1 to 3 feet Wednesday and Wednesday evening.

Superior North Central 11436 19434 11324 11540 19544 13630 11620
11610. A chance of thunderstorms overnight. Waves 3 to 6 feet
overnight and Wednesday. Waves 2 to 4 feet Wednesday evening.

Superior South Central 13420 13620 12710. A chance of showers and
thunderstorms overnight. Waves 2 to 5 feet overnight. Waves 1 to
4 feet Wednesday and Wednesday evening.

Superior East 13430 11530 11630 11620 11720 11710. A chance of
showers and thunderstorms overnight and Wednesday morning. Waves
3 to 6 feet.

$$

GS

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