FZUS63 KMQT 212115
GLFLS

Experimental Tabular Open Lake Forecast for Lake Superior
National Weather Service Negaunee MI
415 PM EST Fri Feb 21 2025

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...High pressure of 30.6 inches sprawled out over the
Mississippi River Valley is currently extending a 30.4 inch ridge
into the Great Lakes. The high and ridge will shift east tonight,
and by Saturday morning, the high will be located over the
southeast U.S. at a pressure of 30.6 inches. Meanwhile, a 29.8
inch low pressure trough will sweep east, reaching northern
Ontario tonight and Saturday. At a pressure of 30.0 inches, the
tail end of this trough will drift south over Lake Superior during
Saturday night. The trough will then quickly lift north on Sunday
as 29.2 inch low pressure moves out over the Prairie Provinces.
The low will then track east, reaching northern Ontario by Monday
morning and northern Quebec during Monday night. One associated
trough at 29.4 inches will cross Lake Superior early Monday
followed by a second at 29.6 inches early on Tuesday. In its wake,
a weak 29.9 inch high pressure ridge will reach Lake Superior
Tuesday evening.

LSZ162-220500-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
357 PM EST Fri Feb 21 2025 /257 PM CST Fri Feb 21 2025/

.LATE THIS AFTERNOON, Southwest winds to 30 knots with a few
gale force gusts to 35 knots possible. Freezing spray. Waves 3 to
6 feet occasionally to 8 feet building to 4 to 7 feet
occasionally to 9 feet.
.TONIGHT, Southwest winds to 30 knots with a few gale force
gusts to 35 knots possible becoming west 20 to 30 knots by
midnight, then diminishing to 15 to 25 knots late. Freezing
spray. Waves building to 6 to 9 feet occasionally to 11 feet,
then subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY, West winds 10 to 20 knots becoming southwest 15 to
25 knots by late morning, then diminishing to 10 to 20 knots by
mid afternoon. A slight chance of snow showers in the morning.
Waves subsiding to 2 to 4 feet.
.SATURDAY NIGHT, West winds 10 to 20 knots diminishing to 5 to
15 knots by midnight, then backing southwest late. Waves
subsiding to calm to 2 feet.
.SUNDAY, Southwest winds 5 to 15 knots becoming south 10 to
20 knots in the afternoon. A slight chance of snow showers,
possibly mixed with rain and freezing rain in the afternoon.
Waves calm to 2 feet.
.SUNDAY NIGHT, Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A chance of rain showers, possibly
mixed with snow. Waves building to 1 to 3 feet.
.MONDAY, West winds 15 to 25 knots. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT, West winds 10 to 20 knots veering northwest after
midnight. Waves calm to 2 feet.
.TUESDAY, West winds 10 to 20 knots backing southwest. Waves
calm to 2 feet.
.WEDNESDAY, Northwest winds 10 to 20 knots. Waves calm to
2 feet.

Note, wave height forecasts are for ice free areas.

LSZ162-220300-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
415 PM EST Fri Feb 21 2025 /315 PM CST Fri Feb 21 2025/

.Tonight...
Weather.............Mostly cloudy with freezing spray.
Sfc winds...........Southwest to 30 knots decreasing to 15 to 20
                              knots after midnight.
100-ft winds........Southwest gales to 35 knots decreasing to 20 to
                              25 knots after midnight.
Sig waves...........8 to 12 feet.
Ocnl waves..........Around 13 feet.

.SATURDAY...
Weather.............Mostly cloudy with a slight chance of snow
                              showers, then partly sunny in the afternoon.
Sfc winds...........Southwest 15 to 20 knots.
100-ft winds........Southwest 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 7 feet.

.SATURDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Southwest 10 to 15 knots.
100-ft winds........Southwest 15 to 20 knots.
Sig waves...........3 to 5 feet subsiding to 2 to 4 feet after
                              midnight.
Ocnl waves..........Around 7 feet in the evening.

.SUNDAY...
Weather.............Mostly cloudy.
Sfc winds...........Northeast 5 to 10 knots becoming south 10 to 15
                              knots in the afternoon.
100-ft winds........Northeast 10 to 15 knots becoming south 15 to
                              20 knots in the afternoon.
Sig waves...........2 to 4 feet.

.SUNDAY NIGHT...
Weather.............Mostly cloudy with chance of rain and snow
                              showers, then mostly cloudy with chance of
                              showers after midnight.
Sfc winds...........Southwest 15 to 20 knots.
100-ft winds........Southwest 20 to 25 knots.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet after midnight.

Wave heights are for ice free areas.

.FORECAST DAYS 3 THROUGH 5...

.MONDAY...Chance of showers, light freezing rain and snow showers
in the morning. slight chance of light freezing rain. South winds
10 to 15 knots. Waves 4 to 6 feet.
.TUESDAY...North winds 10 to 15 knots. Waves 2 to 4 feet.
.WEDNESDAY...South winds 10 to 15 knots. Waves 3 to 5 feet.

$$

LSZ263-220300-
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-
415 PM EST Fri Feb 21 2025

...GALE WARNING IN EFFECT UNTIL 1 AM EST SATURDAY...

.Tonight...
Weather.............Mostly cloudy with freezing spray.
Sfc winds...........Southwest to 30 knots.
100-ft winds........Southwest gales to 35 knots.
Sig waves...........10 to 14 feet.
Ocnl waves..........Around 16 feet.

.SATURDAY...
Weather.............Mostly cloudy with a slight chance of snow
                              showers.
Sfc winds...........Southwest 15 to 20 knots.
100-ft winds........Southwest 20 to 25 knots.
Sig waves...........6 to 9 feet.
Ocnl waves..........Around 10 feet.

.SATURDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Southwest 10 to 15 knots becoming northwest 5
                              to 10 knots after midnight.
100-ft winds........Southwest 15 to 20 knots becoming northwest 10
                              to 15 knots after midnight.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.

.SUNDAY...
Weather.............Mostly cloudy.
Sfc winds...........East 5 to 10 knots becoming south 10 to 15
                              knots in the afternoon.
100-ft winds........East 10 to 15 knots becoming south 15 to 20
                              knots in the afternoon.
Sig waves...........2 to 4 feet.

.SUNDAY NIGHT...
Weather.............Mostly cloudy with chance of rain and snow
                              showers.
Sfc winds...........South 15 to 20 knots.
100-ft winds........South 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.

Wave heights are for ice free areas.

.FORECAST DAYS 3 THROUGH 5...

.MONDAY...Chance of showers, light freezing rain and snow showers
in the morning. slight chance of light freezing rain. South winds
10 to 15 knots. Waves 4 to 6 feet.
.TUESDAY...North winds 10 to 15 knots. Waves 2 to 4 feet.
.WEDNESDAY...South winds 10 to 15 knots. Waves 3 to 5 feet.

$$

LSZ264-220300-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
415 PM EST Fri Feb 21 2025

...GALE WARNING IN EFFECT UNTIL 1 AM EST SATURDAY...

.Tonight...
Weather.............Mostly cloudy, then freezing spray and slight
                              chance of snow showers after midnight.
Sfc winds...........Southwest to 30 knots.
100-ft winds........Southwest gales to 35 knots.
Sig waves...........10 to 14 feet.
Ocnl waves..........Around 16 feet.

.SATURDAY...
Weather.............Mostly cloudy with a slight chance of snow
                              showers, then mostly cloudy with chance of snow
                              showers in the afternoon.
Sfc winds...........West 15 to 20 knots.
100-ft winds........West 20 to 25 knots.
Sig waves...........6 to 9 feet subsiding to 5 to 7 feet in the
                              afternoon.
Ocnl waves..........Around 12 feet subsiding to around 9 feet in
                              the afternoon.

.SATURDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........West 10 to 15 knots.
100-ft winds........West 15 to 20 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.

.SUNDAY...
Weather.............Mostly cloudy.
Sfc winds...........Northeast 5 to 10 knots becoming south 10 to 15
                              knots in the afternoon.
100-ft winds........Northeast 10 to 15 knots becoming south 15 to
                              20 knots in the afternoon.
Sig waves...........2 to 4 feet.

.SUNDAY NIGHT...
Weather.............Cloudy with chance of rain and snow showers.
Sfc winds...........South 15 to 20 knots.
100-ft winds........South 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.


.FORECAST DAYS 3 THROUGH 5...

.MONDAY...Chance of showers, light freezing rain and snow showers
in the morning. slight chance of light freezing rain. South winds
10 to 15 knots. Waves 4 to 6 feet.
.TUESDAY...North winds 10 to 15 knots. Waves 2 to 4 feet.
.WEDNESDAY...South winds 10 to 15 knots. Waves 3 to 5 feet.

$$

LSZ265-220300-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
415 PM EST Fri Feb 21 2025

.Tonight...
Weather.............Mostly cloudy.
Sfc winds...........Southwest 15 to 20 knots.
100-ft winds........Southwest 20 to 25 knots.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet.

.SATURDAY...
Weather.............Mostly cloudy with a slight chance of snow
                              showers.
Sfc winds...........West 15 to 20 knots.
100-ft winds........West 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 5 feet.

.SATURDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Southwest 5 to 10 knots.
100-ft winds........Southwest 10 to 15 knots.
Sig waves...........1 to 3 feet.

.SUNDAY...
Weather.............Mostly cloudy.
Sfc winds...........Light and variable winds becoming south 5 to 10
                              knots in the afternoon.
100-ft winds........Light and variable winds becoming south 10 to
                              15 knots in the afternoon.
Sig waves...........1 to 3 feet.

.SUNDAY NIGHT...
Weather.............Mostly cloudy with chance of snow showers and
                              light freezing rain, then mostly cloudy with
                              chance of showers, snow showers and light
                              freezing rain after midnight.
Sfc winds...........South 10 to 15 knots.
100-ft winds........South 15 to 20 knots.
Sig waves...........2 to 4 feet.

Wave heights are for ice free areas.

.FORECAST DAYS 3 THROUGH 5...

.MONDAY...Chance of showers, light freezing rain and snow showers
in the morning. slight chance of light freezing rain. South winds
10 to 15 knots. Waves 4 to 6 feet.
.TUESDAY...North winds 10 to 15 knots. Waves 2 to 4 feet.
.WEDNESDAY...South winds 10 to 15 knots. Waves 3 to 5 feet.

$$

LSZ266-220300-
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-
415 PM EST Fri Feb 21 2025

.Tonight...
Weather.............Mostly cloudy, then freezing spray after
                              midnight.
Sfc winds...........Southwest 20 to 25 knots.
100-ft winds........Southwest to 30 knots.
Sig waves...........8 to 12 feet.
Ocnl waves..........Around 14 feet.

.SATURDAY...
Weather.............Mostly cloudy with freezing spray with a chance
                              of snow showers, then mostly cloudy with chance
                              of snow showers in the afternoon.
Sfc winds...........Southwest 20 to 25 knots.
100-ft winds........Southwest to 30 knots.
Sig waves...........6 to 9 feet.
Ocnl waves..........Around 11 feet.

.SATURDAY NIGHT...
Weather.............Mostly cloudy with chance of snow showers, then
                              mostly cloudy after midnight.
Sfc winds...........Southwest 10 to 15 knots.
100-ft winds........Southwest 15 to 20 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.

.SUNDAY...
Weather.............Mostly cloudy.
Sfc winds...........East 5 to 10 knots becoming south 10 to 15
                              knots in the afternoon.
100-ft winds........East 10 to 15 knots becoming south 15 to 20
                              knots in the afternoon.
Sig waves...........2 to 4 feet.

.SUNDAY NIGHT...
Weather.............Mostly cloudy with chance of snow showers, then
                              mostly cloudy with rain and snow showers likely
                              after midnight.
Sfc winds...........South 15 to 20 knots.
100-ft winds........South 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 7 feet.


.FORECAST DAYS 3 THROUGH 5...

.MONDAY...Chance of showers, light freezing rain and snow showers
in the morning. slight chance of light freezing rain. South winds
10 to 15 knots. Waves 4 to 6 feet.
.TUESDAY...North winds 10 to 15 knots. Waves 2 to 4 feet.
.WEDNESDAY...South winds 10 to 15 knots. Waves 3 to 5 feet.

$$

LSZ267-220300-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
415 PM EST Fri Feb 21 2025

.Tonight...
Weather.............Mostly cloudy, then freezing spray after
                              midnight.
Sfc winds...........Southwest 20 to 25 knots.
100-ft winds........Southwest to 30 knots.
Sig waves...........6 to 9 feet.
Ocnl waves..........Around 12 feet.

.SATURDAY...
Weather.............Mostly cloudy with freezing spray with a chance
                              of snow showers, then mostly cloudy with chance
                              of snow showers in the afternoon.
Sfc winds...........Southwest 20 to 25 knots.
100-ft winds........Southwest to 30 knots.
Sig waves...........6 to 9 feet.
Ocnl waves..........Around 10 feet.

.SATURDAY NIGHT...
Weather.............Mostly cloudy with chance of snow showers, then
                              mostly cloudy after midnight.
Sfc winds...........Southwest 10 to 15 knots.
100-ft winds........Southwest 15 to 20 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 6 feet.

.SUNDAY...
Weather.............Mostly cloudy.
Sfc winds...........Northeast 5 to 10 knots becoming south 10 to 15
                              knots in the afternoon.
100-ft winds........Northeast 10 to 15 knots becoming south 15 to
                              20 knots in the afternoon.
Sig waves...........2 to 4 feet.

.SUNDAY NIGHT...
Weather.............Mostly cloudy with chance of snow showers, then
                              cloudy with snow showers likely after midnight.
Sfc winds...........South 15 to 20 knots.
100-ft winds........South 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 7 feet.

Wave heights are for ice free areas.

.FORECAST DAYS 3 THROUGH 5...

.MONDAY...Chance of showers, light freezing rain and snow showers
in the morning. slight chance of light freezing rain. South winds
10 to 15 knots. Waves 4 to 6 feet.
.TUESDAY...North winds 10 to 15 knots. Waves 2 to 4 feet.
.WEDNESDAY...South winds 10 to 15 knots. Waves 3 to 5 feet.

$$

LSZ261-220300-
MAFOR 2122/
Superior West...GALE WARNING IN EFFECT...11540 11551 11651 11641
11640 11630 12520. Waves 3 to 6 feet building to 5 to 9 feet,
then subsiding to 4 to 7 feet tonight. Waves 3 to 6 feet
Saturday.

Superior North Central...GALE WARNING IN EFFECT...11540 11550
11651 12641 13630. A chance of snow showers Saturday. Waves 5 to
8 feet building to 7 to 11 feet tonight. Waves 5 to 8 feet
subsiding to 3 to 6 feet Saturday.

Superior South Central 11430 12530 14630 11620. A chance of snow
showers Saturday afternoon. Waves 1 to 3 feet building to 3 to 5
feet, then subsiding to 2 to 4 feet tonight. Waves 2 to 4 feet
subsiding to 1 to 3 feet Saturday. Wave heights are for ice free
areas.

Superior East 11530 11540 11541 11631 11630 12631 11630. A chance
of snow showers Saturday. Waves 2 to 4 feet building to 5 to 8
feet tonight. Waves 4 to 7 feet subsiding to 3 to 6 feet
Saturday.

$$

Occasional waves will only be displayed when values meet or exceed 5 feet.

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