668
FZUS63 KMQT 061336
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
936 AM EDT Mon May 6 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 shifts east
today as a broad 29.1 inch low pressure develops on the Northern
Plains. A strong pressure gradient over western Lake Superior
begins to set up Tuesday morning as a 29.1 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.

LSZ162-062145-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
936 AM EDT Mon May 6 2024 /836 AM CDT Mon May 6 2024/

.REST OF TODAY...East winds 5 to 15 knots increasing to 15 to
25 knots. Waves calm to 2 feet building to 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...East winds 10 to 20 knots increasing to 15 to 25 knots
late. Waves 2 to 4 feet.
.TUESDAY...East winds 20 to 30 knots diminishing to 15 to
25 knots late. A chance of rain showers through early afternoon,
then rain showers likely by mid afternoon. Waves building to 8 to
11 feet occasionally to 14 feet, then subsiding to 6 to 9 feet
occasionally to 11 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 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. A chance of rain showers. Waves
building to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots increasing to
20 to 30 knots after midnight. 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 west 10 to
20 knots. Waves subsiding to calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots veering west. Waves calm
to 2 feet.

$$

LSZ263-062145-
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-
936 AM EDT Mon May 6 2024

.REST OF TODAY...East winds 5 to 15 knots increasing to 10 to
20 knots late. Waves calm to 2 feet building to 1 to 3 feet.
.TONIGHT...East winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight, then increasing to 10 to 20 knots late. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.TUESDAY...East winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. A slight chance of rain showers through early
afternoon, then rain showers likely by mid afternoon. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 6 feet occasionally to 8 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 2 to
4 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. A chance of rain showers. Waves
building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots. 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
5 to 15 knots. Waves subsiding to 1 to 3 feet.
.FRIDAY...Southwest winds 5 to 15 knots veering west. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.

$$

LSZ264-062145-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
936 AM EDT Mon May 6 2024

.REST OF TODAY...South winds 5 to 15 knots backing east late.
Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.TUESDAY...East winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. A chance of rain showers by mid afternoon.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots becoming northeast
15 to 25 knots after midnight. A chance of rain showers. Waves
2 to 4 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. A chance of rain showers. Waves
subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots. Waves building
to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...North winds 15 to 25 knots becoming northwest 5 to
15 knots. Waves subsiding to 1 to 3 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing south. Waves 1 to
3 feet.

$$

LSZ265-062145-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
936 AM EDT Mon May 6 2024

.REST OF TODAY...East winds 5 to 15 knots increasing to 10 to
20 knots late. Waves calm to 2 feet.
.TONIGHT...East winds 10 to 20 knots veering southeast after
midnight. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon, then diminishing to 10 to 20 knots late. Rain
showers likely by mid afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots becoming northeast
5 to 15 knots after midnight. Rain showers likely. Waves
subsiding to calm to 2 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots. A chance of rain
showers. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves building to 2 to 4 feet.
.THURSDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 1 to 3 feet.
.FRIDAY...West winds 10 to 20 knots backing south. Waves
subsiding to calm to 2 feet.

$$

LSZ266-062145-
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-
936 AM EDT Mon May 6 2024

.REST OF TODAY...Southeast winds 5 to 15 knots becoming east
10 to 20 knots late. Waves calm to 2 feet.
.TONIGHT...East winds 10 to 20 knots becoming southeast 5 to
15 knots after midnight. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon, then diminishing to 10 to 20 knots late. A
chance of rain showers by mid afternoon. Waves building to 2 to
4 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots. Rain showers likely.
Waves subsiding to 1 to 3 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. A chance of rain showers. Waves
subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots. Waves building
to 2 to 4 feet.
.THURSDAY...North winds 15 to 25 knots. 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 south. Waves
subsiding to 1 to 3 feet.

$$

LSZ267-062145-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
936 AM EDT Mon May 6 2024

.REST OF TODAY...Southeast winds 5 to 15 knots backing east in
the afternoon, then increasing to 10 to 20 knots late. 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.
.TUESDAY...East winds 10 to 20 knots increasing to 15 to 25 knots
late. A chance of rain showers by mid afternoon. Waves building
to 2 to 4 feet.
.TUESDAY NIGHT...Southeast winds 10 to 20 knots backing east
after midnight. Rain showers likely. 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, then subsiding to calm to
2 feet.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves building to 2 to 4 feet.
.THURSDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. Waves 2 to 4 feet.
.FRIDAY...Northwest winds 10 to 20 knots backing south. Waves
subsiding to 1 to 3 feet.

$$
LSZ261-062145-
MAFOR 0615/
Superior West 11210 15220 11230. Waves 1 to 3 feet this
afternoon. Waves 2 to 4 feet tonight. Waves 3 to 6 feet Tuesday
morning.

Superior North Central 12310 12210 11320 12310 11220. Waves 1
foot or less this afternoon. Waves 1 to 3 feet tonight and
Tuesday morning.

Superior South Central 11300 12210 11320 14310. Waves 1 foot or
less this afternoon. Waves 1 to 3 feet tonight and Tuesday
morning.

Superior East 11300 11200 12210 11310 12300 11210. Waves 2 feet
or less.

$$

07

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

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