274
FZUS63 KMQT 051949
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
349 PM EDT Sun May 5 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 30.1 inch ridge over the Great Lakes today shifts
east Monday as a broad 29.2 inch low pressure develops on the
Northern Plains. A strong pressure gradient over western Lake
Superior begins to set up Tuesday morning as a deepening 29.0 inch
low pushes eastward against 30.0 inch ridging over far northern
Ontario. This gradient loosens into Wednesday as the Northern
Plains low weakens and a 29.5 and a 29.4 inch low ejecting out of
the Plains move south of Lake Superior. After a brief window of
height rises late in the day Wednesday, another 29.4 inch low
moves from the Central Plains into the Lower Great Lakes early
Thursday. Weak 30.0 inch ridging briefly builds in Thursday night
through early Friday before another 29.7 inch low pressure trough
drops through later in the day.



LSZ162-060400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
349 PM EDT Sun May 5 2024 /249 PM CDT Sun May 5 2024/

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...South winds 5 to 15 knots backing east after midnight,
then backing northeast late. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
late. Waves building to 3 to 5 feet occasionally to 7 feet.
.MONDAY NIGHT...East winds 10 to 20 knots. Waves subsiding to
2 to 4 feet, then building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...East winds 20 to 30 knots with a few gale force gusts
to 35 knots. Rain showers. A slight chance of thunderstorms by
mid afternoon. Waves building to 5 to 8 feet occasionally to 10
feet.
.TUESDAY NIGHT...Northeast winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Rain showers likely through
midnight, then a chance of rain showers after midnight. Waves
subsiding to 1 to 3 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. A chance of rain showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY NIGHT...Northeast winds 20 to 30 knots. A chance of
rain showers. Waves subsiding to 2 to 4 feet, then building to
3 to 5 feet occasionally to 7 feet.
.THURSDAY...Northeast winds 15 to 25 knots becoming northwest
10 to 20 knots. Waves subsiding to 1 to 3 feet.
.FRIDAY...Southwest winds 10 to 20 knots veering northwest. Waves
subsiding to calm to 2 feet.

$$

LSZ263-060400-
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-
349 PM EDT Sun May 5 2024

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves 1 to
3 feet building to 2 to 4 feet.
.TONIGHT...Southwest winds 5 to 15 knots backing south after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southeast winds less than 10 knots becoming east 5 to
15 knots in the afternoon. Waves building to 1 to 3 feet.
.MONDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight, then backing east late. Waves 1 to 3 feet.
.TUESDAY...East winds 15 to 25 knots. A chance of rain showers
through early afternoon, then rain showers by mid afternoon.
Waves building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots backing northeast
after midnight. Rain showers likely through midnight, then a
chance of rain showers after midnight. Waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots. A chance of rain
showers. Waves 2 to 4 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots. A chance of
rain showers. Waves building to 3 to 5 feet occasionally to
7 feet.
.THURSDAY...Northeast winds 15 to 25 knots becoming north 5 to
15 knots. Waves subsiding to 2 to 4 feet.
.FRIDAY...West winds 5 to 15 knots. Waves subsiding to 1 to
3 feet.

$$

LSZ264-060400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
349 PM EDT Sun May 5 2024

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves 1 to
3 feet.
.TONIGHT...Southwest winds 5 to 15 knots. Waves subsiding to calm
to 2 feet.
.MONDAY...Southwest winds less than 10 knots becoming southeast
5 to 15 knots in the afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots. Waves building to
1 to 3 feet.
.TUESDAY...East winds 15 to 25 knots. A chance of rain showers.
Waves building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight. Rain showers likely through
midnight, then a chance of rain showers after midnight. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots. A chance of rain
showers. Waves 2 to 4 feet.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 knots. Waves
subsiding to 1 to 3 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...North winds 10 to 20 knots. Waves subsiding to 2 to
4 feet.
.FRIDAY...West winds 5 to 15 knots veering northwest. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.

$$

LSZ265-060400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
349 PM EDT Sun May 5 2024

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing east in the
afternoon, then increasing to 10 to 20 knots late. Waves calm to
2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight, then diminishing to 5 to 15 knots late.
Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots. A slight chance of showers
through early afternoon, then showers likely by mid afternoon.
Waves building to 2 to 4 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots backing northeast after
midnight. Rain showers likely through midnight, then a chance of
rain showers after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots. A chance of rain
showers. Waves building to 1 to 3 feet.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A chance of rain showers. Waves
building to 2 to 4 feet.
.THURSDAY...North 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.
.FRIDAY...Northwest winds 10 to 20 knots backing west. Waves
subsiding to calm to 2 feet.

$$

LSZ266-060400-
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-
349 PM EDT Sun May 5 2024

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest after
midnight, then backing south late. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing east late. Waves calm
to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots. A chance of rain showers by
mid afternoon. Waves building to 2 to 4 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots backing northeast after
midnight. Rain showers likely through midnight, then a chance of
rain showers after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots backing north by mid
afternoon. A chance of rain showers. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A chance of rain showers. Waves
building to 2 to 4 feet.
.THURSDAY...North 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.
.FRIDAY...Northwest winds 10 to 20 knots. Waves subsiding to 2 to
4 feet.

$$

LSZ267-060400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
349 PM EDT Sun May 5 2024

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves 1 to
3 feet subsiding to calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots backing southeast late.
Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing east in the
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots. Waves building to 1 to
3 feet.
.TUESDAY NIGHT...Southeast winds 10 to 20 knots backing northeast
after midnight. Rain showers likely through midnight, then a
chance of rain showers after midnight. Waves 1 to 3 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots backing north by mid
afternoon. A chance of rain showers. Waves subsiding to calm to
2 feet.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A chance of rain showers. Waves
building to 2 to 4 feet.
.THURSDAY...North 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.
.FRIDAY...Northwest winds 10 to 20 knots. Waves 2 to 4 feet.

$$

LSZ261-060400-
MAFOR 0521/
Superior West 11410 11400 11300 12200 11300 11200 11210. Waves 2
feet or less.

Superior North Central 12520 11510 13500 11400 11310. Waves 1 to
3 feet tonight. Waves 1 foot or less Monday.

Superior South Central 11600 14400 11400 11300 11210. Waves 1
foot or less.

Superior East 11600 12500 14400 11200. Waves 1 to 3 feet tonight.
Waves 1 foot or less Monday.

$$

LC

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

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