154
FZUS63 KMQT 171355
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
955 AM EDT Fri May 17 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...As a 29.7 inch low pressure just north of Lake
Superior moves east this afternoon, a weak 29.8 inch high pressure
ridge will drift across the western Great Lakes. As the ridge builds
to 29.9 inches while shifting toward the Lower Great Lakes on
Saturday, a 29.3 inch low over southern Manitoba will push an
associated 29.6 inch trough eastward to western Lake Superior late
in the afternoon. This trough will weaken to 29.9 inches while
sailing across the rest of Lake Superior during Saturday night. The
parent low pressure that was over southern Manitoba on Saturday will
weaken to 29.6 inches as it moves over far northern Ontario during
Sunday. To its south, look for a 30.0 inch high pressure ridge to
settle over the Upper Great Lakes. As this ridge builds to 30.1
inches while quickly shifting to the Mid-Atlantic Coast on Monday, a
29.8 inch trough will develop northeast to Lake Superior and Upper
Michigan. On Tuesday, a 29.4 inch low pressure will track northeast
to the Upper Mississippi Valley.

LSZ162-172200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
955 AM EDT Fri May 17 2024 /855 AM CDT Fri May 17 2024/

.REST OF TODAY...South winds 5 to 15 knots backing east in the
afternoon, then becoming northeast 10 to 20 knots late. A chance
of rain showers. A slight chance of thunderstorms by mid
afternoon. Waves calm to 2 feet building to 2 to 4 feet.
.TONIGHT...Northeast winds 10 to 20 knots. A slight chance of
showers and thunderstorms through midnight. Patchy fog after
midnight. Waves subsiding to 1 to 3 feet, then building to 2 to
4 feet.
.SATURDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then backing west late. A chance of
rain showers and a slight chance of thunderstorms. Waves building
to 1 to 3 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots backing southwest
after midnight. A slight chance of showers and thunderstorms
through midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots backing east after
midnight. Showers likely after midnight. Waves calm to 2 feet.
.MONDAY...Northeast winds 10 to 20 knots backing north. A chance
of rain showers. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.TUESDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.

$$

LSZ263-172200-
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-
955 AM EDT Fri May 17 2024

.REST OF TODAY...Southwest winds 5 to 15 knots backing south in
the afternoon, then backing east late. Patchy fog. A slight
chance of rain showers. A slight chance of thunderstorms by mid
afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots. A slight chance of showers
and thunderstorms through midnight. Waves building to 1 to
3 feet.
.SATURDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then veering southwest late. A chance
of rain showers and a slight chance of thunderstorms. Waves
building to 1 to 3 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight. A slight chance of showers and thunderstorms
through midnight. Waves 1 to 3 feet.
.SUNDAY...Southwest winds 10 to 20 knots. Waves 1 to 3 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots backing southeast after
midnight. A chance of showers. Waves subsiding to calm to 2 feet.
.MONDAY...East winds 5 to 15 knots backing northeast. A chance of
rain showers. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots. A chance of showers. Waves building to 1 to 3 feet.

$$

LSZ264-172200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
955 AM EDT Fri May 17 2024

.REST OF TODAY...Southwest winds 5 to 15 knots backing southeast
late. Patchy fog. A slight chance of rain showers by mid
afternoon. Waves 1 to 3 feet subsiding to calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast late.
Patchy fog through midnight. A slight chance of showers and
thunderstorms. Waves building to 1 to 3 feet.
.SATURDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. A slight chance of showers and
thunderstorms by mid afternoon. Waves building to 2 to 4 feet.
.SATURDAY NIGHT...Southwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. A chance of showers and
thunderstorms through midnight. Waves subsiding to 1 to 3 feet.
.SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves 1 to 3 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. A chance of showers
after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...East winds 5 to 15 knots backing northeast. A chance of
rain showers. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots. A chance of showers. Waves building to 2 to 4 feet.

$$

LSZ265-172200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
955 AM EDT Fri May 17 2024

.REST OF TODAY...South winds 5 to 15 knots backing southeast in
the afternoon, then becoming east 10 to 20 knots late. Patchy fog
through late morning. Waves calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A slight chance of showers and
thunderstorms. Waves building to 1 to 3 feet.
.SATURDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. A slight chance of showers and
thunderstorms by mid afternoon. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A chance of showers and thunderstorms
through midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots backing southeast
after midnight. A chance of showers after midnight. Waves calm to
2 feet.
.MONDAY...Southeast winds 10 to 20 knots backing east. Showers
likely, then a chance of showers. Waves calm to 2 feet.
.TUESDAY...Northeast winds 10 to 20 knots veering east. A chance
of showers. Waves calm to 2 feet.

$$

LSZ266-172200-
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-
955 AM EDT Fri May 17 2024

...DENSE FOG ADVISORY IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON...

.REST OF TODAY...Southwest winds 5 to 15 knots backing south in
the afternoon, then backing east late. Patchy dense fog through
early afternoon. Waves 1 to 3 feet subsiding to calm to 2 feet.
.TONIGHT...East winds 10 to 20 knots veering southeast after
midnight. A slight chance of rain showers. Waves building to 1 to
3 feet.
.SATURDAY...Southeast winds 10 to 20 knots becoming south 15 to
25 knots in the afternoon. A slight chance of showers by mid
afternoon. Waves building to 2 to 4 feet.
.SATURDAY NIGHT...Southwest winds 10 to 20 knots becoming west
5 to 15 knots after midnight. A chance of showers and
thunderstorms. Waves subsiding to 1 to 3 feet.
.SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots backing east. A chance
of rain showers. Waves calm to 2 feet.
.TUESDAY...Northeast winds 10 to 20 knots veering east. A chance
of showers. Waves building to 2 to 4 feet.

$$

LSZ267-172200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
955 AM EDT Fri May 17 2024

...DENSE FOG ADVISORY IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON...

.REST OF TODAY...West winds 5 to 15 knots veering north in the
afternoon, then veering east late. Patchy dense fog through early
afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight, then increasing to 10 to 20 knots late. Waves calm to
2 feet.
.SATURDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots late. Waves calm to 2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots becoming west 5 to
15 knots after midnight. A chance of showers and thunderstorms.
Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots backing east. A chance
of showers. Waves calm to 2 feet.
.TUESDAY...Northeast winds 10 to 20 knots veering east. A chance
of showers. Showers likely. Waves building to 1 to 3 feet.

$$
LSZ261-172200-
MAFOR 1715/
Superior West 11300 11210 11110 11120 11220 13210. A chance of
showers late this morning. A chance of rain showers this evening.
Waves calm to 4 feet.

Superior North Central 11510 11400 12310 12220 12310. Waves 1 to
3 feet.

Superior South Central 11400 19404 12210 12310 13320. Waves 1 to 3
feet.

Superior East 11600 19604 11400 12210 14310. Waves 2 feet or
less.

$$

Rolfson

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

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