551
FZUS63 KMQT 071346
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
946 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 29.1 inch low rotates over the Northern Plains
today, extending 29.6 inch troughing over Lake Superior. 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.

LSZ162-072200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
946 AM EDT Tue May 7 2024 /846 AM CDT Tue May 7 2024/

.REST OF 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 by late morning, then rain showers
likely by mid afternoon. Waves 4 to 8 feet occasionally to
10 feet, then subsiding to 4 to 7 feet occasionally to 9 feet.
.TONIGHT...Northeast winds 10 to 20 knots. A chance of rain
showers. Waves subsiding to 2 to 4 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.

$$

LSZ263-072200-
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-
946 AM EDT Tue May 7 2024

.REST OF TODAY...East winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. A chance of rain showers. Waves 3 to
6 feet occasionally to 8 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.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 subsiding to 1 to 3 feet, then building to
2 to 4 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.

$$

LSZ264-072200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
946 AM EDT Tue May 7 2024

.REST OF 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
1 to 3 feet building to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Southeast winds 10 to 20 knots becoming east 5 to
15 knots after midnight, then becoming northeast 15 to 25 knots
late. A chance of rain showers. Waves subsiding to 1 to 3 feet,
then building to 3 to 5 feet occasionally to 7 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.

$$

LSZ265-072200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
946 AM EDT Tue May 7 2024

.REST OF 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 1 to
3 feet building to 2 to 4 feet.
.TONIGHT...East winds 10 to 20 knots backing northeast late. Rain
showers likely. Waves subsiding 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. 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.

$$

LSZ266-072200-
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-
946 AM EDT Tue May 7 2024

.REST OF 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 1 to
3 feet building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.
.TONIGHT...Southeast winds 10 to 20 knots backing northeast late.
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 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.

$$

LSZ267-072200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
946 AM EDT Tue May 7 2024

.REST OF TODAY...East winds 10 to 20 knots becoming southeast
15 to 25 knots late. Waves calm to 2 feet building to 2 to
4 feet.
.TONIGHT...Southeast winds 10 to 20 knots backing northeast late.
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 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.

$$
LSZ261-072200-
MAFOR 0715/
Superior West 11240 11246 11136 13120 12130. Waves 5 to 8 feet
this afternoon. Waves 4 to 7 feet subsiding to 3 to 6 feet
tonight. Waves 2 to 4 feet Wednesday morning.

Superior North Central 11330 12230 11320 11210 11120 11130 11140.
A chance of rain showers tonight and Wednesday morning. Waves 2
to 5 feet this afternoon and tonight. Waves 3 to 6 feet Wednesday
morning.

Superior South Central 11220 11230 11320 11210 12216 11126 11130.
Waves 2 to 5 feet.

Superior East 12220 12320 11310 11226 11126 11130. Waves 1 to 4
this afternoon and tonight, building to 3 to 5 feet Wednesday
morning.

$$

GS

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

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