FZUS63 KMQT 190815
GLFLS
Experimental Tabular Open Lake Forecast for Lake Superior
National Weather Service Negaunee MI
415 AM EDT Mon May 19 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...A 30.5 inch high pressure over Hudson Bay builds to 30.6
inches by mid morning as ridging over Lake Superior weakens to 30.2
inches this evening. A 29.4 inch low over the Mid-Mississippi Valley
on Tuesday pushes eastward through the day and into the Ohio
Valley/Lower Great Lakes by Wednesday morning; this in turn
decreases ridging over Lake Superior to 30.1 inches by Tuesday
night. This low then may extend a 30.0 inch trough over the lake on
Thursday before it shifts off into the Atlantic. By Friday, the now
30.5 inch high pressure over Hudson Bay brings 30.2 inch ridging
back over Lake Superior.
LSZ162-191615-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
412 AM EDT Mon May 19 2025 /312 AM CDT Mon May 19 2025/
, GALE WARNING IN EFFECT FROM NOON EDT /11 AM CDT/ TODAY THROUGH
THIS EVENING,
.EARLY THIS MORNING, East winds 15 to 25 knots. Waves 1 to
3 feet.
.TODAY, East winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. Waves building to 8 to 11 feet
occasionally to 14 feet.
.TONIGHT, East gales to 35 knots diminishing to 20 to 30 knots
after midnight. Waves subsiding to 4 to 8 feet occasionally to
10 feet.
.TUESDAY, East gales to 35 knots becoming northeast gales to
40 knots in the afternoon. Waves building to 10 to 14 feet
occasionally to 18 feet.
.TUESDAY NIGHT, Northeast gales to 40 knots diminishing to 20 to
30 knots after midnight. A slight chance of rain showers. Waves
subsiding to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY, Northeast winds to 30 knots with a few gale force
gusts up to 35 knots possible diminishing to 20 to 30 knots by
mid afternoon. Waves subsiding to 3 to 5 feet occasionally to 7
feet.
.WEDNESDAY NIGHT, North winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.THURSDAY, Northeast winds 5 to 15 knots backing north. Waves
calm to 2 feet.
.FRIDAY, North winds 5 to 15 knots. Waves calm to 2 feet.
LSZ162-191400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
415 AM EDT Mon May 19 2025 /315 AM CDT Mon May 19 2025/
...GALE WARNING IN EFFECT FROM NOON EDT /11 AM CDT/ TODAY THROUGH
THIS EVENING...
.Today...
Weather.............Mostly sunny.
Sfc winds...........Northeast to 30 knots.
100-ft winds........Northeast gales to 35 knots.
Sig waves...........5 to 7 feet building to 8 to 12 feet in the
afternoon.
Ocnl waves..........Around 9 feet building to around 15 feet in the
afternoon.
.TONIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Northeast to 30 knots.
100-ft winds........Northeast gales to 35 knots.
Sig waves...........8 to 12 feet.
Ocnl waves..........Around 15 feet.
.TUESDAY...
Weather.............Partly sunny.
Sfc winds...........East to 30 knots becoming northeast gales to 35
knots in the afternoon.
100-ft winds........East gales to 35 knots becoming northeast at 45
knots in the afternoon.
Sig waves...........10 to 14 feet.
Ocnl waves..........Around 18 feet.
.TUESDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Northeast to 30 knots.
100-ft winds........Northeast gales to 35 knots.
Sig waves...........12 to 16 feet subsiding to 8 to 12 feet after
midnight.
Ocnl waves..........Around 20 feet subsiding to around 15 feet
after midnight.
.FORECAST DAYS 3 THROUGH 5...
.WEDNESDAY...Northeast winds 15 to 20 knots. Waves 6 to 9 feet.
.THURSDAY...Chance of showers. North winds 10 to 15 knots. Waves
4 to 6 feet.
.FRIDAY...Chance of showers in the morning. North winds 10 to
15 knots. Waves 3 to 5 feet.
$$
LSZ263-191400-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
415 AM EDT Mon May 19 2025
...GALE WATCH IN EFFECT FROM TUESDAY MORNING THROUGH TUESDAY
AFTERNOON...
.Today...
Weather.............Mostly sunny.
Sfc winds...........Northeast 20 to 25 knots.
100-ft winds........Northeast to 30 knots.
Sig waves...........5 to 7 feet building to 8 to 12 feet in the
afternoon.
Ocnl waves..........Around 8 feet building to around 14 feet in the
afternoon.
.TONIGHT...
Weather.............Partly cloudy.
Sfc winds...........Northeast 15 to 20 knots.
100-ft winds........Northeast 20 to 25 knots.
Sig waves...........6 to 9 feet.
Ocnl waves..........Around 12 feet.
.TUESDAY...
Weather.............Mostly sunny.
Sfc winds...........East to 30 knots.
100-ft winds........East gales to 35 knots.
Sig waves...........8 to 12 feet.
Ocnl waves..........Around 15 feet.
.TUESDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Northeast to 30 knots.
100-ft winds........Northeast gales to 35 knots.
Sig waves...........8 to 12 feet.
Ocnl waves..........Around 14 feet.
.FORECAST DAYS 3 THROUGH 5...
.WEDNESDAY...Northeast winds 15 to 20 knots. Waves 6 to 9 feet.
.THURSDAY...Chance of showers. North winds 10 to 15 knots. Waves
4 to 6 feet.
.FRIDAY...Chance of showers in the morning. North winds 10 to
15 knots. Waves 3 to 5 feet.
$$
LSZ264-191400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
415 AM EDT Mon May 19 2025
.Today...
Weather.............Sunny.
Sfc winds...........Northeast 15 to 20 knots.
100-ft winds........Northeast 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 8 feet.
.TONIGHT...
Weather.............Partly cloudy.
Sfc winds...........Northeast 10 to 15 knots increasing to east 20
to 25 knots after midnight.
100-ft winds........Northeast 15 to 20 knots increasing to east to
30 knots after midnight.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 7 feet.
.TUESDAY...
Weather.............Mostly sunny.
Sfc winds...........East 20 to 25 knots.
100-ft winds........East to 30 knots.
Sig waves...........6 to 9 feet.
Ocnl waves..........Around 11 feet.
.TUESDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Northeast 15 to 20 knots increasing to 30 knots
after midnight.
100-ft winds........Northeast 20 to 25 knots increasing to 35 knot
gales after midnight.
Sig waves...........6 to 9 feet.
Ocnl waves..........Around 10 feet.
.FORECAST DAYS 3 THROUGH 5...
.WEDNESDAY...Northeast winds 15 to 20 knots. Waves 6 to 9 feet.
.THURSDAY...Chance of showers. North winds 10 to 15 knots. Waves
4 to 6 feet.
.FRIDAY...Chance of showers in the morning. North winds 10 to
15 knots. Waves 3 to 5 feet.
$$
LSZ265-191400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
415 AM EDT Mon May 19 2025
.Today...
Weather.............Mostly sunny.
Sfc winds...........Northeast 15 to 20 knots.
100-ft winds........Northeast 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 8 feet.
.TONIGHT...
Weather.............Partly cloudy.
Sfc winds...........North 10 to 15 knots increasing to east 20 to
25 knots after midnight.
100-ft winds........North 15 to 20 knots increasing to east to 30
knots after midnight.
Sig waves...........3 to 5 feet building to 5 to 7 feet after
midnight.
Ocnl waves..........Around 6 feet building to around 9 feet after
midnight.
.TUESDAY...
Weather.............Mostly sunny.
Sfc winds...........East 20 to 25 knots.
100-ft winds........East to 30 knots.
Sig waves...........6 to 9 feet.
Ocnl waves..........Around 10 feet.
.TUESDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Northeast 20 to 25 knots.
100-ft winds........Northeast to 30 knots.
Sig waves...........6 to 9 feet.
Ocnl waves..........Around 10 feet.
.FORECAST DAYS 3 THROUGH 5...
.WEDNESDAY...Northeast winds 15 to 20 knots. Waves 6 to 9 feet.
.THURSDAY...Chance of showers. North winds 10 to 15 knots. Waves
4 to 6 feet.
.FRIDAY...Chance of showers in the morning. North winds 10 to
15 knots. Waves 3 to 5 feet.
$$
LSZ266-191400-
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 AM EDT Mon May 19 2025
.Today...
Weather.............Sunny.
Sfc winds...........Northeast 15 to 20 knots.
100-ft winds........Northeast 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 8 feet.
.TONIGHT...
Weather.............Partly cloudy.
Sfc winds...........North 10 to 15 knots increasing to northeast 20
to 25 knots after midnight.
100-ft winds........North 15 to 20 knots increasing to northeast to
30 knots after midnight.
Sig waves...........3 to 5 feet building to 5 to 7 feet after
midnight.
Ocnl waves..........Around 6 feet building to around 9 feet after
midnight.
.TUESDAY...
Weather.............Mostly sunny.
Sfc winds...........East 20 to 25 knots.
100-ft winds........East to 30 knots.
Sig waves...........6 to 9 feet.
Ocnl waves..........Around 10 feet.
.TUESDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Northeast 20 to 25 knots.
100-ft winds........Northeast to 30 knots.
Sig waves...........5 to 7 feet.
Ocnl waves..........Around 9 feet.
.FORECAST DAYS 3 THROUGH 5...
.WEDNESDAY...Northeast winds 15 to 20 knots. Waves 6 to 9 feet.
.THURSDAY...Chance of showers. North winds 10 to 15 knots. Waves
4 to 6 feet.
.FRIDAY...Chance of showers in the morning. North winds 10 to
15 knots. Waves 3 to 5 feet.
$$
LSZ267-191400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
415 AM EDT Mon May 19 2025
.Today...
Weather.............Sunny.
Sfc winds...........North 15 to 20 knots.
100-ft winds........North 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 7 feet.
.TONIGHT...
Weather.............Mostly clear.
Sfc winds...........Northeast 15 to 20 knots.
100-ft winds........Northeast 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.TUESDAY...
Weather.............Mostly sunny.
Sfc winds...........Northeast 15 to 20 knots.
100-ft winds........Northeast 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.TUESDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Northeast 20 to 25 knots.
100-ft winds........Northeast to 30 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 7 feet.
.FORECAST DAYS 3 THROUGH 5...
.WEDNESDAY...Northeast winds 15 to 20 knots. Waves 6 to 9 feet.
.THURSDAY...Chance of showers. North winds 10 to 15 knots. Waves
4 to 6 feet.
.FRIDAY...Chance of showers in the morning. North winds 10 to
15 knots. Waves 3 to 5 feet.
$$
LSZ261-191400-
MAFOR 1909/
Superior West...GALE WARNING IN EFFECT...11220 11230 15240. Waves
1 to 3 feet building to 6 to 9 feet today. Waves 5 to 9 feet
subsiding to 4 to 7 feet tonight.
Superior North Central 11120 12130 11120 12110 12230. Waves 2 to
4 feet building to 3 to 5 feet, then subsiding to 2 to 4 feet
today. Waves 1 to 3 feet building to 3 to 5 feet tonight.
Superior South Central 11120 11130 12120 12110 12230. Waves 2 to
4 feet building to 3 to 5 feet today. Waves 2 to 3 feet building
to 3 to 6 feet tonight.
Superior East 13130 11120 11820 11120 11130 11230. Waves 2 to 3
feet building to 3 to 5 feet, then subsiding to 2 to 3 feet
today. Waves 1 to 3 feet building to 3 to 5 feet tonight.
$$
Occasional waves will only be displayed when values meet or exceed 5 feet.
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