716
FZUS63 KMQT 180135
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
935 PM 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... A weak 29.8 inch high pressure ridge will drift
across the western Great Lakes tonight. 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. This low
deepens to 29.3 inches, centering over Upper Michigan early
Wednesday.

LSZ162-180945-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
935 PM EDT Fri May 17 2024 /835 PM CDT Fri May 17 2024/

.REST OF TONIGHT...Northeast winds 10 to 20 knots veering east
late. Scattered rain showers and a slight chance of
thunderstorms. Waves 2 to 4 feet subsiding to 1 to 3 feet, then
building to 2 to 4 feet.
.SATURDAY...East winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then veering west late. A chance of
showers and a slight chance of thunderstorms. Waves 1 to 3 feet.
.SATURDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then backing southwest late. Waves
building to 2 to 4 feet, then subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots. Waves building to 1 to
3 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots backing northeast
after midnight. A chance of showers. Waves subsiding to calm to
2 feet.
.MONDAY...East winds 10 to 20 knots backing northeast by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.TUESDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 2 to 4 feet.
.WEDNESDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots. A chance of rain showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 1 to 3 feet.

$$

LSZ263-180945-
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-
935 PM EDT Fri May 17 2024

.REST OF TONIGHT...East winds 5 to 15 knots. A slight chance of
thunderstorms and isolated rain showers. Waves 1 to 3 feet
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.SATURDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots in the afternoon, then veering southwest late. A slight
chance of rain showers through early afternoon. A slight chance
of thunderstorms. Rain showers likely by mid afternoon. Waves
1 to 3 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots becoming southwest
5 to 15 knots late. A chance of rain showers and a slight chance
of thunderstorms through midnight. Waves 1 to 3 feet.
.SUNDAY...Southwest winds 10 to 20 knots. Waves building to 2 to
4 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. A chance of showers.
Waves subsiding to calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots backing northeast by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.TUESDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of rain showers. Waves subsiding to 1 to
3 feet.

$$

LSZ264-180945-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
935 PM EDT Fri May 17 2024

.REST OF TONIGHT...East winds 10 to 20 knots becoming southeast
5 to 15 knots late. Scattered rain showers and a slight chance of
thunderstorms. Waves calm to 2 feet building to 2 to 4 feet.
.SATURDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. A chance of showers. A slight chance
of thunderstorms by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY NIGHT...Southwest winds 10 to 20 knots veering west
after midnight, then becoming southwest 5 to 15 knots late. Rain
showers likely and a slight chance of thunderstorms through
midnight. Waves subsiding to 1 to 3 feet.
.SUNDAY...Southwest winds 10 to 20 knots. Waves building to 2 to
4 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots backing northeast
after midnight. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of rain showers. Waves subsiding to 2 to
4 feet.

$$

LSZ265-180945-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
935 PM EDT Fri May 17 2024

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

$$

LSZ266-180945-
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-
935 PM EDT Fri May 17 2024

.REST OF TONIGHT...Southeast winds 10 to 20 knots veering south
late. Scattered rain showers. A slight chance of thunderstorms
after midnight. Waves 1 to 3 feet.
.SATURDAY...South winds 10 to 20 knots becoming southeast 15 to
25 knots in the afternoon, then veering south late. A slight
chance of showers and thunderstorms by mid afternoon. Waves
building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight, then becoming west 5 to 15 knots late. Showers
likely and a slight chance of thunderstorms through midnight.
Waves subsiding to 1 to 3 feet.
.SUNDAY...Southwest winds 5 to 15 knots backing south by mid
afternoon. Waves 1 to 3 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots. Showers likely. Waves
calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots backing northeast
after midnight. A chance of rain showers. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots becoming east 10 to
20 knots. A chance of showers, then showers likely late. A chance
of thunderstorms. Waves building to 2 to 4 feet.
.WEDNESDAY...West winds 15 to 25 knots. A chance of rain showers.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.

$$

LSZ267-180945-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
935 PM EDT Fri May 17 2024

.REST OF TONIGHT...Southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Patchy dense fog after midnight.
Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots. Waves building to
1 to 3 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots becoming west 5 to
15 knots late. Showers likely and a slight chance of
thunderstorms. Waves subsiding to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing south by mid
afternoon. Waves 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. Showers likely. Waves
calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots becoming northeast
5 to 15 knots after midnight. A chance of showers. Waves calm to
2 feet.
.TUESDAY...Northeast winds 10 to 20 knots veering southeast. A
chance of showers, then showers likely late. A chance of
thunderstorms. Waves building to 1 to 3 feet.
.WEDNESDAY...West winds 15 to 25 knots. A chance of showers.
Waves building to 2 to 4 feet.

$$
LSZ261-180945-
MAFOR 1803/
Superior West 12220 12210 11310 11410 11626 11620. A chance of
thunderstorms Saturday afternoon. Waves 2 to 4 feet.

Superior North Central 11320 19326 11220 19226 13320 11330 11436
11526. Waves 2 to 3 feet overnight. Waves 2 to 5 feet Saturday
and Saturday evening.

Superior South Central 12320 11420 12320 12330 11426. Waves 1 to
3 feet.

Superior East 14310 11310 12320 11420. A chance of showers
Saturday evening. Waves 1 to 3 feet overnight and Saturday. Waves
2 to 4 feet Saturday evening.

$$

BW

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

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