591
FZUS63 KMQT 080147
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
947 PM EDT Tue May 7 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 29.3 inch low rotates over the Northern Plains,
extending 29.6 inch troughing over Lake Superior this evening.
Through Wednesday, the Northern Plains low weakens and a 29.5 inch
low ejecting out of the Plains moves east along the southern end
of the Great Lakes Basin. After a brief window of height rises
late in the day Wednesday, another 29.5 inch low moves from the
Central Plains to the Ohio River Valley 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. A 29.5 inch trough
moves over northern Lake Superior Sunday afternoon as a 29.2 inch
low pressure skirts across the southern Hudson Bay.


LSZ162-081000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
947 PM EDT Tue May 7 2024 /847 PM CDT Tue May 7 2024/

.REST OF TONIGHT...Northeast winds 10 to 20 knots diminishing to
5 to 15 knots late. A chance of rain showers. Waves 3 to 6 feet
occasionally to 8 feet subsiding to 1 to 3 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots becoming east 20 to
30 knots in the afternoon, then diminishing to 15 to 25 knots
late. A slight chance of rain showers through early afternoon.
Waves building to 3 to 6 feet occasionally to 8 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 diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to 1 to 3 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 becoming west 15 to
25 knots by mid afternoon. A chance of rain showers by mid
afternoon. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots. Waves calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots veering northwest. A chance
of rain showers. Waves calm to 2 feet.

$$

LSZ263-081000-
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-
947 PM EDT Tue May 7 2024

.REST OF TONIGHT...East winds 5 to 15 knots backing northeast
after midnight, then increasing to 10 to 20 knots late. A chance
of rain showers. Waves 2 to 4 feet subsiding to 1 to 3 feet, then
building to 2 to 4 feet.
.WEDNESDAY...Northeast winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon, then veering east late. A slight
chance of rain showers through early afternoon. Waves building to
3 to 6 feet occasionally to 8 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots. Waves
subsiding to 2 to 4 feet, then building to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY...Northeast winds 15 to 25 knots becoming north 10 to
20 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots. A chance of rain
showers by mid afternoon. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots veering west. Waves calm
to 2 feet.

$$

LSZ264-081000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
947 PM EDT Tue May 7 2024

.REST OF TONIGHT...East winds 5 to 15 knots backing northeast
after midnight, then increasing to 15 to 25 knots late. A chance
of rain showers. Waves 1 to 3 feet building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...Northeast winds 20 to 30 knots diminishing to 10 to
20 knots. A slight chance of rain showers through early
afternoon. 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 increasing to
20 to 30 knots after midnight, then diminishing to 15 to 25 knots
late. Waves building to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...Northeast winds 15 to 25 knots becoming north 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots backing west
after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots. Waves building to 1 to
3 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots veering northwest
after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots backing southwest.
Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots becoming northwest 10 to
20 knots. Waves building to 1 to 3 feet.

$$

LSZ265-081000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
947 PM EDT Tue May 7 2024

.REST OF TONIGHT...East winds 10 to 20 knots becoming northeast
5 to 15 knots after midnight, then becoming north 10 to 20 knots
late. A chance of rain showers. Waves 1 to 3 feet subsiding to
calm to 2 feet.
.WEDNESDAY...North winds 10 to 20 knots. A chance of rain showers
through early afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. Waves 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 subsiding to calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots backing west
after midnight. Waves calm to 2 feet.
.FRIDAY...West winds 10 to 20 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots veering northwest
after midnight. Waves calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots backing southwest.
Waves calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots veering west. A chance
of rain showers. Waves calm to 2 feet.

$$

LSZ266-081000-
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-
947 PM EDT Tue May 7 2024

.REST OF TONIGHT...Southeast winds 10 to 20 knots becoming
northeast 5 to 15 knots after midnight, then increasing to 10 to
20 knots late. A chance of rain showers. Waves 2 to 4 feet
subsiding to 1 to 3 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...Northeast winds 20 to 30 knots becoming north 15 to
25 knots in the afternoon, then diminishing to 10 to 20 knots
late. A chance of rain showers through early afternoon. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
2 to 4 feet.
.WEDNESDAY NIGHT...North winds 15 to 25 knots veering northeast
after midnight, then diminishing to 10 to 20 knots late. Waves
building to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.FRIDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots becoming northwest
10 to 20 knots after midnight. Waves calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots backing west. Waves
calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots becoming west 15 to
25 knots. A chance of rain showers. Waves building to 1 to
3 feet.

$$

LSZ267-081000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
947 PM EDT Tue May 7 2024

.REST OF TONIGHT...Southeast winds 10 to 20 knots backing
northeast late. A chance of rain showers by late evening, then
rain showers after midnight. Waves 1 to 3 feet subsiding to calm
to 2 feet, then building to 1 to 3 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots backing north in the
afternoon, then diminishing to 10 to 20 knots late. A chance of
rain showers through early afternoon. Waves building to 3 to
6 feet occasionally to 8 feet, then subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.
.THURSDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots. Waves building to
2 to 4 feet, then subsiding to 1 to 3 feet.
.FRIDAY...Northwest winds 10 to 20 knots backing west by mid
afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots backing west. Waves
calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots backing south. A chance
of rain showers. Waves calm to 2 feet.

$$
LSZ261-081000-
MAFOR 0803/
Superior West 11110 13120 11130 11230 11220 11120. A chance of
rain showers overnight and Wednesday morning. Waves 2 to 4 feet
overnight building to 4 to 6 feet Wednesday then subsiding to 2
to 4 feet Wednesday evening.

Superior North Central 11210 11120 13130 12120 11130. A chance of
rain showers overnight. A chance of showers Wednesday morning.
Waves 2 to 4 feet overnight. Waves 3 to 6 feet Wednesday. Waves 2
to 4 feet Wednesday evening.

Superior South Central 11216 11116 11810 12820 11810 11800 11810.
Waves 2 to 4 feet.

Superior East 11310 11116 11126 12130 11820 11810 11820. Waves 1
to 3 feet overnight. Waves 2 to 4 feet Wednesday. Waves 2 to 3
feet Wednesday 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