248
FZUS63 KMQT 191349
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
949 AM EDT Wed Jun 19 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...Ridging builds over Lake Superior today through
tonight as a strengthening high pressure arrives over Lake
Superior by Thursday at 30.4 inches and remains through Friday as
it slowly weakens. By Friday night, the high weakens to 30.2
inches and slides east. Low pressure of 29.7 inches lifts off of
the Colorado Rockies Friday night and deepens to 29.6 inches by
the time it arrives over Lake Superior Saturday. The troughing
over Lake Superior deepens to at least 29.5 inches by Saturday
night as the low strengthens while moving eastward into northern
Ontario. By Sunday, the troughing over the lake gives way to weak
ridging of 29.8 inches as a weak high pressure of 30.0 inches
moves through the Northern Plains. The ridging remains over Lake
Superior through Monday as the high moves through the Midwest.


LSZ162-192200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
949 AM EDT Wed Jun 19 2024 /849 AM CDT Wed Jun 19 2024/

.REST OF TODAY...West winds 15 to 25 knots diminishing to 5 to
15 knots. Waves 3 to 5 feet occasionally to 7 feet subsiding to
calm to 2 feet.
.TONIGHT...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 in the afternoon, then veering east late. Waves calm to
2 feet.
.THURSDAY NIGHT...Northeast winds 5 to 15 knots. A slight 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. A chance of showers through early
afternoon. Showers likely by mid afternoon. 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 10 to 20 knots backing west. Showers
likely. A chance of thunderstorms. A chance of showers. Waves
subsiding to calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots. A chance of showers. Waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.

$$

LSZ263-192200-
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-
949 AM EDT Wed Jun 19 2024

.REST OF TODAY...West winds 20 to 30 knots diminishing to 10 to
20 knots. Waves 4 to 7 feet occasionally to 9 feet subsiding to
1 to 3 feet.
.TONIGHT...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 late.
Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots. A slight chance of
showers 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. Showers and a chance of
thunderstorms. Waves calm to 2 feet.
.SATURDAY...Northeast winds 10 to 20 knots becoming west 5 to
15 knots. Showers likely. A chance of thunderstorms. A chance of
showers. Waves building to 1 to 3 feet, then subsiding to calm to
2 feet.
.SUNDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots. A chance of showers. Waves subsiding to calm to 2 feet.

$$

LSZ264-192200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
949 AM EDT Wed Jun 19 2024

.REST OF TODAY...West winds 20 to 30 knots diminishing to 10 to
20 knots late. Waves 4 to 7 feet occasionally to 9 feet subsiding
to 2 to 4 feet.
.TONIGHT...West winds 5 to 15 knots becoming northwest less than
10 knots late. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds less than 10 knots becoming east 5 to
15 knots in the afternoon, then veering south late. Waves calm to
2 feet.
.THURSDAY NIGHT...East 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. A chance of showers
through midnight. A chance of thunderstorms. Showers likely after
midnight. Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots becoming northwest 5 to
15 knots. Showers likely. A chance of thunderstorms. A chance of
showers. Waves building to 1 to 3 feet.
.SUNDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots. A chance of showers. Waves subsiding to calm to 2 feet.

$$

LSZ265-192200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
949 AM EDT Wed Jun 19 2024

.REST OF TODAY...West winds 15 to 25 knots diminishing to 10 to
20 knots late. Isolated showers and thunderstorms by late
morning. Waves 1 to 3 feet building to 2 to 4 feet, then
subsiding to calm to 2 feet.
.TONIGHT...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 east late. Waves
calm to 2 feet.
.THURSDAY NIGHT...East winds less than 10 knots. A slight chance
of showers. 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 veering northwest.
Showers. A chance of thunderstorms. A chance of showers. Waves
calm to 2 feet.
.SUNDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ266-192200-
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-
949 AM EDT Wed Jun 19 2024

.REST OF TODAY...West winds 15 to 25 knots diminishing to 10 to
20 knots late. Scattered showers and thunderstorms by late
morning. Waves 3 to 6 feet occasionally to 8 feet building to
4 to 7 feet occasionally to 9 feet, then subsiding to 2 to
4 feet.
.TONIGHT...Northwest winds 5 to 15 knots. Waves subsiding to calm
to 2 feet.
.THURSDAY...North winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...North winds 5 to 15 knots diminishing to less
than 10 knots after midnight. A slight chance of showers. 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 northwest.
Showers. A chance of thunderstorms. A chance of showers. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots. A chance of showers.
Waves subsiding to calm to 2 feet.

$$

LSZ267-192200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
949 AM EDT Wed Jun 19 2024

.REST OF TODAY...Southwest winds 15 to 25 knots veering west in
the afternoon, then becoming northwest 10 to 20 knots late.
Scattered showers and thunderstorms. Waves 2 to 4 feet.
.TONIGHT...Northwest winds 5 to 15 knots. Waves subsiding to calm
to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing northwest in the
afternoon, then increasing to 10 to 20 knots late. Waves calm to
2 feet.
.THURSDAY NIGHT...North winds 5 to 15 knots. A slight chance of
showers. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. 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,
then showers after midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots veering northwest.
Showers and a chance of thunderstorms. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots. A chance of showers.
Waves building to 1 to 3 feet.

$$
LSZ261-192200-
MAFOR 1915/
Superior West 11630 12620 11510 11600 11800 11100 11200. Waves 3
to 5 feet subsiding to 2 to 3 feet this afternoon. Waves 1 to 3
feet subsiding to 1 foot or less tonight. Waves 1 foot or less
Thursday morning.

Superior North Central 11640 11630 11620 11610 11600 12700 11800.
Waves 4 to 7 feet subsiding to 3 to 6 feet this afternoon. Waves
3 to 5 feet subsiding to 1 to 3 feet tonight. Waves 1 to 2 feet
Thursday morning.

Superior South Central 12630 11620 11710 11600 12700 11800. Waves
2 to 4 feet this afternoon. Waves 1 to 3 feet subsiding to 1 foot
or less tonight. Waves 1 foot or less Thursday morning.

Superior East 12630 11720 11710 12700 12800. Waves 3 to 5 feet
this afternoon. Waves 3 to 5 feet subsiding to 1 to 3 feet
tonight. Waves 1 to 2 feet Thursday morning.

$$

TAP

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

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