979
FZUS63 KMQT 031338
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
938 AM EDT Thu Apr 3 2025

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 over western Lake Superior will lift
to near James Bay this afternoon, weakening slightly to 29.4
inches. 30.1 inch ridging builds over Lake Superior Thursday
night, then builds to 30.3 inches by Friday morning. Saturday,
Lake Superior will be between a 30.4 inch high over the Central
Plains and a 29.8 inch low moving through the Lower Great Lakes.
This low deepens to 29.3 inches over northern Quebec while the
high over the Plains weakens to 30.2 inches on Sunday. Monday, a
30.3 inch high will settle from the Canadian Prairie to the
Northern Plains while a 29.6 inch low passes towards the Lower
Great Lakes.

LSZ162-032145-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
938 AM EDT Thu Apr 3 2025 /838 AM CDT Thu Apr 3 2025/

.REST OF TODAY...West winds 20 to 30 knots diminishing to 10 to
20 knots late. Waves 3 to 6 feet occasionally to 8 feet subsiding
to 1 to 3 feet.
.TONIGHT...West winds 5 to 15 knots veering northwest after
midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots veering east in the
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Northeast winds 5 to 15 knots becoming north
10 to 20 knots after midnight. A chance of snow showers, possibly
mixed with rain. Waves calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots backing west by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots veering northwest
after midnight. Waves calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots becoming north 15 to
25 knots. A chance of snow showers. Waves building to 2 to
4 feet.
.MONDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ263-032145-
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-
938 AM EDT Thu Apr 3 2025

...GALE WARNING IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON...

.REST OF TODAY...West gales to 35 knots diminishing to 15 to
25 knots. Waves 6 to 9 feet occasionally to 11 feet subsiding to
3 to 6 feet occasionally to 8 feet.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight, then veering northwest late. Waves subsiding to
calm to 2 feet.
.FRIDAY...West winds less than 10 knots backing south in the
afternoon, then becoming east 5 to 15 knots late. Waves calm to
2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots backing north after
midnight. A slight chance of rain and snow showers after
midnight. Waves calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots backing west by mid
afternoon. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots veering northwest
after midnight. Waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.
.SUNDAY...Northwest winds 10 to 20 knots becoming north 15 to
25 knots. Waves building to 3 to 6 feet occasionally to 8 feet.
.MONDAY...North winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.

$$

LSZ264-032145-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
938 AM EDT Thu Apr 3 2025

...GALE WARNING IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON...

.REST OF TODAY...Northwest gales to 35 knots becoming west 15 to
25 knots late. A slight chance of snow showers by late morning.
Waves 6 to 9 feet occasionally to 11 feet building to 7 to
10 feet occasionally to 13 feet, then subsiding to 4 to 7 feet
occasionally to 9 feet.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight, then veering northwest late. Waves subsiding to
calm to 2 feet.
.FRIDAY...West winds less than 10 knots backing southwest in the
afternoon, then backing southeast late. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots veering northwest
after midnight. Waves calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots becoming west 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots. Waves building
to 2 to 4 feet.
.SUNDAY...Northwest winds 10 to 20 knots becoming north 15 to
25 knots. Waves building to 4 to 7 feet occasionally to 9 feet.
.MONDAY...North winds 10 to 20 knots. Freezing spray. Waves
subsiding to 2 to 4 feet.

$$

LSZ265-032145-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
938 AM EDT Thu Apr 3 2025

...GALE WARNING IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON...

.REST OF TODAY...West gales to 35 knots diminishing to 15 to
25 knots late. A slight chance of snow showers by late morning.
Waves 5 to 8 feet occasionally to 10 feet subsiding to 3 to
5 feet occasionally to 7 feet.
.TONIGHT...West winds 15 to 25 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots backing east in the afternoon.
Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.SATURDAY...Northwest winds 10 to 20 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots. Waves calm to
2 feet.
.SUNDAY...Northwest winds 15 to 25 knots veering north. A chance
of snow showers. Waves building to 3 to 5 feet occasionally to
7 feet.
.MONDAY...North winds 15 to 25 knots backing northwest. Waves
subsiding to 1 to 3 feet.

$$

LSZ266-032145-
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-
938 AM EDT Thu Apr 3 2025

...GALE WARNING IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON...

.REST OF TODAY...West gales to 40 knots diminishing to 20 to
30 knots late. A slight chance of snow showers by late morning.
Waves 7 to 10 feet occasionally to 13 feet building to 10 to
14 feet occasionally to 18 feet, then subsiding to 7 to 10 feet
occasionally to 13 feet.
.TONIGHT...West winds 15 to 25 knots becoming northwest 10 to
20 knots after midnight, then diminishing to 5 to 15 knots late.
Waves subsiding to 1 to 3 feet.
.FRIDAY...West winds 5 to 15 knots backing south in the
afternoon, then backing east late. Waves subsiding to calm to
2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.SATURDAY...Northwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves building to 2 to 4 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots. Waves subsiding
to 1 to 3 feet, then building to 2 to 4 feet.
.SUNDAY...Northwest winds 15 to 25 knots veering north. A chance
of snow showers. Waves building to 3 to 6 feet occasionally to
8 feet.
.MONDAY...North winds 15 to 25 knots. Freezing spray. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 5 feet occasionally to 7 feet.

$$

LSZ267-032145-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
938 AM EDT Thu Apr 3 2025

...GALE WARNING IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON...

.REST OF TODAY...West gales to 40 knots. A slight chance of rain
and snow showers by late morning. Waves 5 to 8 feet occasionally
to 10 feet building to 10 to 14 feet occasionally to 18 feet,
then subsiding to 7 to 10 feet occasionally to 13 feet.
.TONIGHT...West winds 15 to 25 knots becoming northwest 10 to
20 knots after midnight, then becoming north 5 to 15 knots late.
Waves subsiding to 2 to 4 feet.
.FRIDAY...North winds 5 to 15 knots veering south in the
afternoon, then backing east late. Waves subsiding to calm to
2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves building to 2 to 4 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves 2 to 4 feet.
.SUNDAY...Northwest winds 15 to 25 knots veering north. Waves
building to 3 to 6 feet occasionally to 8 feet.
.MONDAY...North winds 15 to 25 knots. Waves building to 4 to
7 feet occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.

$$
LSZ261-032145-
MAFOR 0315/
Superior West...GALE WARNING IN EFFECT...11640 11630 11620 12610
13700. Waves 4 to 7 feet subsiding to 3 to 5 feet this afternoon.
Waves 2 to 4 feet subsiding to 1 foot or less tonight through Friday
morning.

Superior North Central...GALE WARNING IN EFFECT...11750 11740
12630 12710 11700 11600. Waves 5 to 9 feet this afternoon. Waves
4 to 7 feet subsiding to 2 to 4 feet tonight. Waves 1 to 2 feet
Friday morning.

Superior South Central...GALE WARNING IN EFFECT...12650 11640
11630 12710 12600. Waves 6 to 10 feet this afternoon. Waves 4 to
7 feet subsiding to 1 to 2 feet tonight. Waves 2 feet or less
Friday morning.

Superior East...GALE WARNING IN EFFECT...12650 11640 11630 11720
11710 12800. Waves 8 to 11 feet building to 10 to 13 feet this
afternoon. Waves 8 to 11 feet subsiding to 3 to 5 feet tonight.
Waves 2 to 4 feet Friday morning.

$$

WFO MQT

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

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