913
FZUS63 KMQT 170139
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
939 PM EDT Thu May 16 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 29.7 inch low pressure overtop far western Lake
Superior will track northeast into Ontario overnight. In its wake,
a weak 29.8 inch high pressure ridge will drift across the
western Great Lakes on Friday. As the ridge builds to 29.9 inches
while shifting toward the Lower Great Lakes on Saturday, a 29.3
inch low pressure over southern Manitoba will push an associated
29.6 inch trough toward western Lake Superior. This trough will
weaken to 29.9 inches while moving across Lake Superior during
Saturday night. The parent low pressure that was over southern
Manitoba on Saturday will weaken to 29.7 inches as it moves over
far northern Ontario during Sunday. To its south, look for a 29.9
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 29.6 inch low pressure trough will
approach Lake Superior from the west. This low heads northeast
towards James Bay through Monday and a secondary 29.5 inch low
begins to strengthen west of the Upper Great Lakes Tuesday.

LSZ162-170945-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
939 PM EDT Thu May 16 2024 /839 PM CDT Thu May 16 2024/

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

$$

LSZ263-170945-
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-
939 PM EDT Thu May 16 2024

.REST OF TONIGHT...Southwest winds 5 to 15 knots veering west
late. Isolated rain showers by late evening. Patchy fog. Waves
1 to 3 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing east late. A
slight chance of showers and thunderstorms by mid afternoon.
Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots veering southeast late.
A slight chance of showers and thunderstorms. Waves calm to
2 feet.
.SATURDAY...South winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A chance of showers and thunderstorms
by mid afternoon. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight. A 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...Southeast winds 5 to 15 knots. A chance of
showers. Waves subsiding to calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots veering west. A chance of
showers. Waves building to 1 to 3 feet, then subsiding to calm to
2 feet.
.TUESDAY...North winds 10 to 20 knots backing west. A chance of
showers. Waves building to 1 to 3 feet.

$$

LSZ264-170945-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
939 PM EDT Thu May 16 2024

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

$$

LSZ265-170945-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
939 PM EDT Thu May 16 2024

.REST OF TONIGHT...Southeast winds 5 to 15 knots veering
southwest after midnight, then veering west late. Isolated rain
showers by late evening. Patchy fog. Waves 1 to 3 feet subsiding
to calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots becoming southeast 10 to
20 knots in the afternoon, then backing east late. Waves calm to
2 feet.
.FRIDAY NIGHT...East winds 10 to 20 knots veering southeast after
midnight. A slight chance of rain showers. Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. A slight chance of showers by mid
afternoon. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots veering west after
midnight. A chance of showers. Waves subsiding to calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots backing southeast 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 veering south. A chance
of showers. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots veering west. A chance of
showers. Waves calm to 2 feet.

$$

LSZ266-170945-
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-
939 PM EDT Thu May 16 2024

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

$$

LSZ267-170945-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
939 PM EDT Thu May 16 2024

.REST OF TONIGHT...Southeast winds 10 to 20 knots becoming south
5 to 15 knots late. A slight chance of thunderstorms and isolated
rain showers. Patchy fog after midnight. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots backing east late. Waves calm
to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. A chance of showers. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots becoming north 5 to 15 knots
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. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots veering west. A chance of
showers. Waves building to 1 to 3 feet.

$$
LSZ261-170945-
MAFOR 1703/
Superior West 11610 11510 11610 11500 11400 13210. Waves 2 feet
or less overnight and Friday. Waves 1 to 3 feet Friday evening.

Superior North Central 11420 11520 19526 11520 11610 11510 11400
11300 11310. Waves 2 to 4 feet overnight subsiding to 1 to 2 feet
Friday and Friday evening.

Superior South Central 11410 11500 12600 11500 11300 11210 11300.
Waves 1 to 3 feet overnight. Waves 2 feet or less Friday and
Friday evening.

Superior East 11310 11410 11500 11600 11500 11400 12200. Waves 1
to 3 feet overnight and Friday.

$$

BW

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

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