685
FZUS63 KMQT 011343
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
943 AM EDT Wed May 1 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 29.6 inch low pressure currently over south central
Lake Superior continues lifting into northern Ontario as it
weakens to 29.7 inches today. Ridging builds to 30.1 inches over
the Upper Great Lakes tonight, then shifts east on Thursday as a
29.7 inch low pressure tracks across the Upper Mississippi
Valley. The low then lifts north over northwestern Ontario
Friday. A weak 30.0 inch trough pivots across the lake Saturday
morning ahead of ridging that builds to 30.1 inches by Saturday
evening; this ridging persists through Sunday. The ridging leaves
the Upper Great Lakes Monday as a deepening low lifts off of the
Northern Rockies into the Northern Plains.

LSZ162-012145-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
943 AM EDT Wed May 1 2024 /843 AM CDT Wed May 1 2024/

.REST OF TODAY...North winds 15 to 25 knots becoming west 10 to
20 knots in the afternoon. A slight chance of rain showers. Waves
3 to 6 feet occasionally to 8 feet subsiding to 2 to 4 feet.
.TONIGHT...Northwest winds 5 to 15 knots. Waves subsiding to calm
to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots increasing to 20 to
30 knots. A chance of rain showers. Waves building to 4 to 7 feet
occasionally to 9 feet.
.THURSDAY NIGHT...East winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Rain showers through midnight, then a
chance of rain showers after midnight. Waves building to 5 to
8 feet occasionally to 10 feet, then subsiding to 2 to 4 feet.
.FRIDAY...Southwest winds 15 to 25 knots. Waves building to 3 to
6 feet occasionally to 8 feet.
.FRIDAY NIGHT...Southwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots veering west. A chance
of rain showers. Waves calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots backing south. Waves
calm to 2 feet.

$$

LSZ263-012145-
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-
943 AM EDT Wed May 1 2024

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

$$

LSZ264-012145-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
943 AM EDT Wed May 1 2024

.REST OF TODAY...East winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then backing northwest late. Patchy
fog late this morning. Rain showers by late morning, then a
chance of rain showers by mid afternoon. Waves 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds less than 10 knots becoming northeast
5 to 15 knots in the afternoon, then veering east late. A chance
of rain showers by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Rain showers. Waves building to 3 to
6 feet occasionally to 8 feet.
.FRIDAY...South winds 20 to 30 knots becoming southwest 15 to
25 knots by mid afternoon. A chance of rain showers through early
afternoon. Waves 3 to 6 feet occasionally to 8 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots becoming southwest
5 to 15 knots after midnight. Waves subsiding to 1 to 3 feet.
.SATURDAY...Southwest winds 5 to 15 knots veering west. Waves
subsiding to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing south. Waves calm to
2 feet.

$$

LSZ265-012145-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
943 AM EDT Wed May 1 2024

.REST OF TODAY...Southeast winds 10 to 20 knots becoming west
15 to 25 knots in the afternoon, then increasing to 20 to
30 knots late. Patchy fog late this morning. A chance of rain
showers. Waves 3 to 5 feet occasionally to 7 feet subsiding to 2
to 4 feet, then building to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...West winds 15 to 25 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots backing east in the
afternoon, then increasing to 10 to 20 knots late. A chance of
rain showers by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots veering southeast
after midnight. Rain showers. A slight chance of thunderstorms
after midnight. Waves building to 2 to 4 feet.
.FRIDAY...South winds 10 to 20 knots veering southwest by mid
afternoon. A chance of rain showers through early afternoon.
Waves subsiding to 1 to 3 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots veering west. A chance
of rain showers. Waves calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots backing south. Waves calm to
2 feet.

$$

LSZ266-012145-
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-
943 AM EDT Wed May 1 2024

.REST OF TODAY...East winds 10 to 20 knots veering west in the
afternoon, then increasing to 20 to 30 knots late with a few gale
force gusts up to 35 knots possible. Patchy fog late this
morning. 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...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to 2 to 4 feet.
.THURSDAY...Northwest winds 5 to 15 knots veering northeast in
the afternoon, then veering east late. A chance of rain showers
by mid afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots becoming southeast
20 to 30 knots after midnight. Rain showers. A slight chance of
thunderstorms after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY...South winds 15 to 25 knots. A chance of rain showers
through early afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots. Waves subsiding to
1 to 3 feet.
.SATURDAY...Southwest winds 10 to 20 knots veering west. A chance
of rain showers. Waves subsiding to calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots backing south. Waves calm to
2 feet.

$$

LSZ267-012145-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
943 AM EDT Wed May 1 2024

.REST OF TODAY...Southeast winds 15 to 25 knots veering south in
the afternoon, then becoming west 20 to 30 knots late. Patchy fog
late this morning. A chance of rain showers. Waves 2 to 4 feet
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.TONIGHT...West winds 20 to 30 knots becoming northwest 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
Waves building to 5 to 8 feet occasionally to 10 feet, then
subsiding to 2 to 4 feet.
.THURSDAY...West winds 5 to 15 knots veering north in the
afternoon, then veering east late. A slight chance of rain
showers by mid afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots becoming southeast
20 to 30 knots after midnight. Rain showers. A slight chance of
thunderstorms after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY...Southeast winds 20 to 30 knots diminishing to 10 to
20 knots by mid afternoon. A chance of rain showers. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves calm to 2 feet.
.SATURDAY...Northeast winds 10 to 20 knots backing northwest. A
chance of rain showers. Waves calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots backing southwest. Waves calm
to 2 feet.

$$
LSZ261-012145-
MAFOR 0115/
Superior West 11720 12610 12710 11700 11800 11100. Waves 3 to 6
feet this afternoon. Waves 2 to 4 feet subsiding to 1 to 2 feet
tonight. Waves around 1 foot Thursday morning.

Superior North Central 11236 11820 12730 13710 11800. Waves 3 to
6 feet this afternoon. Waves 3 to 6 feet subsiding to 1 to 3 feet
tonight. Waves 1 to 2 feet Thursday morning.

Superior South Central 11420 13640 11720 11610 11710 11700. A
chance of showers late this morning. Waves 2 to 4 feet building
to 3 to 6 feet this afternoon. Waves 4 to 7 feet subsiding to 1
to 3 feet tonight. Waves 2 feet or less Thursday morning.

Superior East 11320 11530 11630 11740 12720 11710 11700. A chance
of showers this afternoon. Waves 3 to 5 feet this afternoon.
Waves 5 to 8 feet tonight. Waves 2 to 4 feet Thursday morning.

$$

TAP

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

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