992
FZUS63 KMQT 070756
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
356 AM 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 weak ridge at 29.9 inches extending over southern
Ontario and parts of the Great Lakes Basin retreats north this
morning while a 29.1 inch low rotates over the Northern Plains.
This sets up a strong pressure gradient over western Lake
Superior this morning as the 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 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.

LSZ162-071600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
356 AM EDT Tue May 7 2024 /256 AM CDT Tue May 7 2024/

.EARLY THIS MORNING...East winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TODAY...East winds 15 to 25 knots increasing to 20 to 30 knots
in the afternoon, then becoming northeast 15 to 25 knots late. A
chance of rain showers through early afternoon. A slight chance
of thunderstorms. Rain showers by mid afternoon. Waves building
to 5 to 8 feet occasionally to 10 feet.
.TONIGHT...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Patchy fog. Rain showers likely through
midnight. A chance of rain showers after midnight. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots becoming east 15 to
25 knots in the afternoon, then diminishing to 10 to 20 knots
late. Patchy fog through early afternoon. A chance of rain
showers. Waves building to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots. 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...Northwest winds 5 to 15 knots becoming west
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots veering northwest. A
chance of rain showers. Waves calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots. Waves calm to 2 feet.

$$

LSZ263-071600-
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-
356 AM EDT Tue May 7 2024

.EARLY THIS MORNING...East winds 10 to 20 knots. Waves 1 to
3 feet building to 2 to 4 feet.
.TODAY...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 6 feet occasionally to 8 feet.
.TONIGHT...East winds 5 to 15 knots backing northeast after
midnight, then increasing to 10 to 20 knots late. Patchy fog.
Rain showers likely through midnight. A chance of rain showers
after midnight. Waves subsiding to 2 to 4 feet, then building to
3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Patchy fog through early 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 10 to 20 knots increasing to
15 to 25 knots after midnight. 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 diminishing to 10 to
20 knots by mid afternoon. Waves 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...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-071600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
356 AM EDT Tue May 7 2024

.EARLY THIS MORNING...Southeast winds 5 to 15 knots. Waves 1 to
3 feet.
.TODAY...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.
.TONIGHT...East winds 5 to 15 knots becoming northeast 15 to
25 knots late. Patchy fog. A chance of rain showers. Waves
subsiding to 2 to 4 feet, then building to 4 to 7 feet
occasionally to 9 feet.
.WEDNESDAY...Northeast winds 20 to 30 knots diminishing to 5 to
15 knots. Patchy fog through early afternoon. A slight chance of
rain showers. Waves subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet,
then building to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...Northeast winds 10 to 20 knots becoming north 5 to
15 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots. Waves subsiding
to calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing south. Waves calm
to 2 feet.
.SATURDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-071600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
356 AM EDT Tue May 7 2024

.EARLY THIS MORNING...Southeast winds 10 to 20 knots. Waves calm
to 2 feet.
.TODAY...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 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.
.TONIGHT...East winds 10 to 20 knots backing northeast late.
Patchy fog. Rain showers likely. Waves subsiding to 1 to 3 feet,
then building to 2 to 4 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots backing north in the
afternoon, then diminishing to 10 to 20 knots late. Patchy fog
through early 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 1 to 3 feet.
.THURSDAY...Northeast winds 10 to 20 knots backing north by mid
afternoon. 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 becoming southeast 5 to
15 knots. Waves calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots backing west. Waves
calm to 2 feet.

$$

LSZ266-071600-
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-
356 AM EDT Tue May 7 2024

.EARLY THIS MORNING...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...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, then subsiding to 2 to
4 feet.
.TONIGHT...East winds 10 to 20 knots becoming northeast 15 to
25 knots late. Patchy fog. Rain showers likely. Waves building to
3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Northeast winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon, then becoming north 10 to 20 knots
late. Patchy fog through early 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...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 10 to 20 knots backing north by mid
afternoon. Waves subsiding to 2 to 4 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots backing northwest
after midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...Northwest winds 10 to 20 knots backing south. Waves
subsiding to calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots. Waves calm to 2 feet.

$$

LSZ267-071600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
356 AM EDT Tue May 7 2024

.EARLY THIS MORNING...Southeast winds 10 to 20 knots. Waves calm
to 2 feet.
.TODAY...East winds 10 to 20 knots increasing to 15 to 25 knots
late. A slight chance of rain showers by mid afternoon. Waves
building to 2 to 4 feet.
.TONIGHT...Southeast winds 15 to 25 knots becoming east 10 to
20 knots after midnight, then increasing to 15 to 25 knots late.
A chance of rain showers through midnight, then rain showers
likely after midnight. Patchy fog after midnight. Waves subsiding
to 1 to 3 feet, then building to 2 to 4 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots becoming north 10 to
20 knots late. Patchy fog through early afternoon. Rain showers
likely through early afternoon, then a chance of rain showers by
mid afternoon. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 knots increasing to
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 south. Waves
subsiding to calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots. Waves calm to 2 feet.

$$

LSZ261-071600-
MAFOR 0709/
Superior West 11220 11230 11240 11246 11236 11136 11126 11120.
Waves 3 to 5 feet building to 5 to 8 feet today, then subsiding
to 3 to 5 feet tonight.

Superior North Central 11310 12220 12230 11220 11210 11120. A
chance of rain showers overnight. Waves 2 to 5 feet.

Superior South Central 11310 11320 12220 11230 13226. Waves 1 to
3 feet building to 3 to 5 feet today, then subsiding to 2 to 3
feet tonight.

Superior East 12310 12220 11320 11330 11230 11226. Waves 1 to 4
feet.

$$

Jablonski

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

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