Great Lakes Forecast
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FZUS63 KMQT 211330
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
930 AM EDT Thu Mar 21 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...Ridging builds to 30.4 inches across the Great Lakes
today. A weak 30.2 inch inverted trough moves across Lake Superior
on Friday as a 29.8 inch low pressure skirts along the Ohio River
Valley. Ridging around 30.4 inches builds into the High Plains
and Lake Superior on Saturday. A deep low pressure near 29.2
inches ejects out of Rockies on Sunday, moving towards the western
Great Lakes on Monday.

LSZ162-212130-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
930 AM EDT Thu Mar 21 2024 /830 AM CDT Thu Mar 21 2024/

.REST OF TODAY...Northwest winds 5 to 15 knots backing southwest
late. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots backing east after
midnight. A slight chance of snow showers after midnight. Waves
calm to 2 feet.
.FRIDAY...Northeast winds 10 to 20 knots backing northwest late.
A chance of snow through early afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots becoming north
10 to 20 knots after midnight. A slight chance of snow showers
through midnight. Waves building to 2 to 4 feet, then subsiding
to calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots backing southwest by
mid afternoon. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots backing east after
midnight. Waves calm to 2 feet.
.SUNDAY...East winds 15 to 25 knots increasing to gales to
35 knots. A chance of snow, then snow likely. Waves building to
7 to 10 feet occasionally to 13 feet.
.MONDAY...East gales to 40 knots. Snow, rain. Waves building to
9 to 12 feet occasionally to 15 feet, then subsiding to 5 to
8 feet occasionally to 10 feet.

$$

LSZ263-212130-
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-
930 AM EDT Thu Mar 21 2024

.REST OF TODAY...Northwest winds 5 to 15 knots backing west late.
Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots backing southeast after
midnight. A slight chance of snow showers after midnight. Waves
calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots backing north in the
afternoon, then becoming northwest 15 to 25 knots late. A chance
of snow. Waves calm to 2 feet.
.FRIDAY NIGHT...Northwest winds 20 to 30 knots becoming north
15 to 25 knots after midnight. A slight chance of snow showers.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.
.SATURDAY...Northwest winds 10 to 20 knots becoming southwest
5 to 15 knots by mid afternoon. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots backing southeast
after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots increasing to gales to
35 knots. A chance of snow, then snow likely. Waves building to
6 to 9 feet occasionally to 11 feet.
.MONDAY...East gales to 35 knots. Snow, rain. Waves building to
8 to 12 feet occasionally to 15 feet.

$$

LSZ264-212130-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
930 AM EDT Thu Mar 21 2024

.REST OF TODAY...Northwest winds 5 to 15 knots backing west late.
Waves 1 to 3 feet subsiding to calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots veering northwest in the
afternoon, then increasing to 10 to 20 knots late. A slight
chance of snow. Waves calm to 2 feet.
.FRIDAY NIGHT...North winds 15 to 25 knots. A slight chance of
snow showers. Freezing spray after midnight. Waves building to
3 to 5 feet occasionally to 7 feet.
.SATURDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet,
then building to 1 to 3 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots backing south
after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots increasing to 20 to 30 knots.
A chance of snow. Waves building to 5 to 8 feet occasionally to
10 feet.
.MONDAY...East gales to 40 knots. Snow likely. Rain likely. Waves
building to 8 to 12 feet occasionally to 15 feet.

$$

LSZ265-212130-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
930 AM EDT Thu Mar 21 2024

.REST OF TODAY...Northwest winds 10 to 20 knots. Waves 2 to
4 feet subsiding to calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots backing southeast after
midnight, then becoming south 10 to 20 knots late. A slight
chance of snow showers after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots veering north in the
afternoon, then increasing to 10 to 20 knots late. Snow likely
through early afternoon, then a chance of snow by mid afternoon.
Waves calm to 2 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots. A chance of snow
showers. Waves building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...Northwest winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots becoming east 20 to
30 knots. A chance of snow, then snow likely. Waves building to
4 to 7 feet occasionally to 9 feet.
.MONDAY...East gales to 35 knots becoming southeast gales to
40 knots. Snow likely. Rain likely. Waves building to 7 to
10 feet occasionally to 13 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.

$$

LSZ266-212130-
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-
930 AM EDT Thu Mar 21 2024

.REST OF TODAY...Northwest winds 10 to 20 knots. A slight chance
of snow showers by late morning. Waves 3 to 5 feet occasionally
to 7 feet subsiding to calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots backing south after midnight,
then increasing to 10 to 20 knots late. A chance of snow showers
after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots veering northwest late. Snow
through early afternoon, then a chance of snow by mid afternoon.
Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.FRIDAY NIGHT...North winds 15 to 25 knots increasing to 20 to
30 knots after midnight. A chance of snow showers. Freezing spray
after midnight. Waves building to 3 to 6 feet occasionally to
8 feet.
.SATURDAY...Northwest winds 15 to 25 knots diminishing to 5 to
15 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots becoming south 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots becoming east 20 to
30 knots. A chance of snow. Waves building to 4 to 7 feet
occasionally to 9 feet.
.MONDAY...East gales to 35 knots becoming southeast gales to
40 knots. Snow likely. Rain likely. Waves building to 8 to
12 feet occasionally to 15 feet.

$$

LSZ267-212130-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
930 AM EDT Thu Mar 21 2024

.REST OF TODAY...North winds 10 to 20 knots backing northwest
late. A chance of snow showers. Waves 3 to 5 feet occasionally to
7 feet subsiding to calm to 2 feet.
.TONIGHT...West winds 10 to 20 knots becoming south 5 to 15 knots
after midnight, then increasing to 10 to 20 knots late. A chance
of snow showers after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then backing southeast late. A chance
of snow. Waves building to 2 to 4 feet, then subsiding to calm to
2 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots becoming north
20 to 30 knots after midnight. A chance of snow showers. Freezing
spray after midnight. Waves building to 3 to 6 feet occasionally
to 8 feet.
.SATURDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots by mid afternoon. Freezing spray through early
afternoon. Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots backing south
after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots becoming east 15 to
25 knots. A chance of snow. Waves building to 3 to 6 feet
occasionally to 8 feet.
.MONDAY...East gales to 35 knots becoming southeast gales to
40 knots. A chance of snow. Rain likely. Waves building to 6 to
9 feet occasionally to 11 feet.

$$
LSZ261-212130-
MAFOR 2115/
Superior West 11710 11610 11510 11400 12300 11200 11110. A chance
of snow Friday morning. Waves 1 foot or less.

Superior North Central 12710 11610 12500 12400 11500. Waves 1 to
3 feet this afternoon and tonight. Waves 1 foot or less Friday
morning.

Superior South Central 11720 11710 11700 11600 12400 11410 11527.
Waves 1 to 4 feet this afternoon. Waves 2 feet or less tonight
and Friday morning.

Superior East 11720 12710 11610 11600 11400 11410 11437. A chance
of snow showers late this morning. Waves 1 to 4 feet.

$$

GS

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

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


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