881
FZUS63 KMQT 061953
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
353 PM 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 slowly drifts
eastward and weakens to 29.9 inches tonight while low pressure
deepens to 29.1 inches over 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
29.5 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 29.5 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. This will be followed by weak height rises Saturday as a weak
ridge briefly builds to 29.8 inches.



LSZ162-070400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
353 PM EDT Mon May 6 2024 /253 PM CDT Mon May 6 2024/

.LATE THIS AFTERNOON...Northeast winds 15 to 25 knots. Waves 2 to
4 feet building to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...East winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then increasing to 20 to 30 knots late.
Waves subsiding to 2 to 4 feet, then building to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...East winds 15 to 25 knots increasing to 20 to 30 knots
in the afternoon, then diminishing to 15 to 25 knots late. A
chance of rain showers through early afternoon, then rain showers
likely and 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, then increasing to 15 to 25 knots
late. A slight chance of thunderstorms through midnight. A chance
of rain showers. Waves subsiding to 3 to 5 feet occasionally to
7 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 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY NIGHT...Northeast winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...Northeast winds 15 to 25 knots. Waves subsiding to
2 to 4 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots veering northwest. Waves
calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots veering west. Waves
calm to 2 feet.

$$

LSZ263-070400-
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-
353 PM EDT Mon May 6 2024

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves calm to
2 feet building to 1 to 3 feet.
.TONIGHT...East winds 10 to 20 knots. 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 chance of rain showers. Waves building to
3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots becoming northeast
15 to 25 knots late. A chance of rain showers. Waves subsiding to
2 to 4 feet, then building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northeast winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. A chance of rain showers. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding 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 backing north by mid
afternoon. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 2 to 4 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots backing west
after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-070400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
353 PM EDT Mon May 6 2024

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...East winds 10 to 20 knots diminishing to 5 to 15 knots
late. Waves building to 1 to 3 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
slight chance of rain showers by mid afternoon. Waves building to
3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots becoming northeast
15 to 25 knots late. A chance of rain showers. Waves subsiding to
2 to 4 feet, then building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northeast winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. A chance of rain showers. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
2 to 4 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots. Waves
subsiding to 1 to 3 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...Northeast winds 15 to 25 knots becoming north 10 to
20 knots by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots backing west
after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots veering north. Waves calm
to 2 feet.
.SATURDAY...North winds 5 to 15 knots backing west. Waves calm to
2 feet.

$$

LSZ265-070400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
353 PM EDT Mon May 6 2024

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...East winds 10 to 20 knots veering southeast after
midnight. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots becoming east 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 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots. A chance of rain
showers through midnight, then rain showers likely after
midnight. Waves subsiding to 1 to 3 feet, then building to 2 to
4 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots backing north by mid
afternoon. A chance of rain showers. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.
.THURSDAY...North winds 15 to 25 knots. Waves building to 2 to
4 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots backing west
after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...West winds 10 to 20 knots backing southeast. Waves calm
to 2 feet.
.SATURDAY...North winds 10 to 20 knots backing west. Waves calm
to 2 feet.

$$

LSZ266-070400-
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-
353 PM EDT Mon May 6 2024

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves calm to
2 feet building to 1 to 3 feet.
.TONIGHT...East winds 10 to 20 knots becoming southeast 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots. 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 10 to 20 knots. A chance of rain
showers. Waves building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Northeast winds 20 to 30 knots becoming north 15 to
25 knots by mid afternoon. A chance of rain showers. Waves
building to 3 to 6 feet occasionally to 8 feet, then subsiding to
2 to 4 feet.
.WEDNESDAY NIGHT...North winds 15 to 25 knots veering northeast
after midnight. Waves subsiding to 1 to 3 feet, then building to
3 to 5 feet occasionally to 7 feet.
.THURSDAY...North winds 15 to 25 knots. Waves subsiding to 2 to
4 feet.
.THURSDAY NIGHT...North winds 15 to 25 knots becoming northwest
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...West winds 10 to 20 knots backing southeast. Waves
subsiding to calm to 2 feet.
.SATURDAY...North winds 10 to 20 knots backing west. Waves calm
to 2 feet.

$$

LSZ267-070400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
353 PM EDT Mon May 6 2024

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots becoming southeast 10 to
20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots backing east in the
afternoon, then becoming southeast 15 to 25 knots late. Waves
building to 2 to 4 feet.
.TUESDAY NIGHT...Southeast winds 10 to 20 knots backing east
after midnight. A chance of rain showers. Waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots backing north by mid
afternoon. A chance of rain showers. Waves subsiding to 1 to
3 feet.
.WEDNESDAY NIGHT...North winds 10 to 20 knots becoming northeast
15 to 25 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...Northeast winds 15 to 25 knots backing north by mid
afternoon. Waves subsiding to 2 to 4 feet, then building to 3 to
5 feet occasionally to 7 feet.
.THURSDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...Northwest winds 10 to 20 knots backing southeast. Waves
subsiding to calm to 2 feet.
.SATURDAY...North winds 10 to 20 knots backing west. Waves calm
to 2 feet.

$$

LSZ261-070400-
MAFOR 0621/
Superior West 11120 11230 13220 11230 11240 11246. Waves 2 to 4
feet tonight. Waves 3 to 5 feet building to 5 to 8 feet Tuesday.

Superior North Central 12220 12320 11310 12220 11230. Waves 1 to
3 feet tonight. Waves 2 to 4 feet building to 3 to 5 feet
Tuesday.

Superior South Central 12210 14310 11220 11230. Waves 1 to 3 feet
tonight. Waves 1 to 3 feet building to 3 to 5 feet Tuesday.

Superior East 13200 11300 12310 11320 11220. Waves 1 foot or less
tonight. Waves 1 to 3 feet building to 2 to 4 feet Tuesday.

$$

LC

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

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