National Weather Service Marine Forecast FZUS61 KBUF

FZUS61 KBUF 240902
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
402 AM EST Wed Dec 24 2025

For waters beyond five nautical miles of shore on Lake Ontario

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 30.4 inch sfc high builds across the lake today, then sliding off the Mid-Alantic coast Christmas eve. A weak 29.8 inch sfc low moves across southern Quebec Christmas Day, with its cold front dropping southward across the Lake. With the passage of this front, a strong 30.6 inch sfc high over Ontario will slide over the Lake Thursday night and then linger just to the east of the Lake Friday. A compact 29.6 inch surface low will slide well south of the lake across Ohio and southern Pennsylvania Friday night into Saturday. Another 29.5 inch surface low will pass by to the northeast of the lake Sunday.

LOZ062-241600
Lake Ontario open waters from the Niagara River to Hamlin Beach
402 AM EST Wed Dec 24 2025

TODAY
Northwest winds 15 to 25 knots becoming west and diminishing to 5 to 15 knots. Waves 6 to 9 feet subsiding to 2 feet or less. Waves occasionally around 11 feet.

TONIGHT
West winds 10 knots or less becoming southwest. Waves 1 foot or less.

THURSDAY
West winds 10 to 15 knots becoming north 15 to 20 knots. Waves 1 to 3 feet.

THURSDAY NIGHT
Northeast winds 15 to 20 knots becoming east. Waves 2 to 4 feet.

FRIDAY
East winds to 30 knots diminishing to 15 to 20 knots. Snow. Waves 4 to 7 feet building to 6 to 9 feet, then subsiding to 4 to 7 feet. Waves occasionally around 11 feet.

SATURDAY
East winds 5 to 15 knots. Waves 3 to 5 feet subsiding to 1 to 3 feet.

SUNDAY
Southeast winds 10 to 15 knots becoming west and increasing to 40 knot gales. Rain during the day, then rain and snow Sunday night. Waves 1 to 3 feet building to 13 to 17 feet. Waves occasionally around 22 feet.

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LOZ063-241600
Lake Ontario open waters from Hamlin Beach to Sodus Bay
402 AM EST Wed Dec 24 2025

TODAY
Northwest winds to 30 knots becoming west and diminishing to 5 to 15 knots this afternoon. Waves 9 to 12 feet subsiding to 1 to 3 feet. Waves occasionally around 15 feet.

TONIGHT
West winds 5 to 15 knots becoming southwest. Waves 1 to 2 feet.

THURSDAY
West winds 10 to 15 knots becoming north 15 to 20 knots. Waves 1 to 3 feet building to 3 to 5 feet.

THURSDAY NIGHT
North winds 15 to 20 knots becoming northeast. Waves 3 to 5 feet.

FRIDAY
East winds 15 to 25 knots becoming southeast. Snow. Waves 3 to 5 feet building to 4 to 7 feet, then subsiding to 3 to 6 feet. Waves occasionally around 9 feet.

SATURDAY
Southeast winds 15 to 20 knots diminishing to 10 to 15 knots. Snow likely during the day. Waves 3 to 5 feet subsiding to 1 to 3 feet.

SUNDAY
Southeast winds 15 to 20 knots becoming west and increasing to 40 knot gales. Rain during the day, then rain and snow Sunday night. Waves 2 to 4 feet building to 15 to 20 feet. Waves occasionally around 26 feet.

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LOZ064-065-241600
Lake Ontario open waters from Sodus Bay to the Saint Lawrence River
402 AM EST Wed Dec 24 2025

TODAY
Northwest winds to 30 knots diminishing to 5 to 15 knots. Waves 9 to 12 feet subsiding to 1 to 3 feet. Waves occasionally around 15 feet.

TONIGHT
West winds 5 to 15 knots becoming south. Waves 2 feet or less.

THURSDAY
Southwest winds 10 to 15 knots becoming north and increasing to 15 to 25 knots. Waves 1 to 2 feet building to 3 to 6 feet.

THURSDAY NIGHT
North winds 15 to 25 knots becoming northeast. Waves 3 to 6 feet subsiding to 2 to 4 feet.

FRIDAY
East winds 10 to 15 knots becoming southeast 15 to 20 knots. Snow. Waves 1 to 3 feet building to 3 to 5 feet.

SATURDAY
Southeast winds 15 to 20 knots diminishing to 10 to 15 knots. Snow likely during the day. Waves 2 to 4 feet subsiding to 1 to 3 feet.

SUNDAY
Southeast winds 15 to 20 knots becoming west and increasing to 40 knot gales. Rain during the day, then rain and snow Sunday night. Waves 2 to 4 feet building to 16 to 21 feet. Waves occasionally around 27 feet.

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LOZ061-241600
MAFOR 2410/ ONTARIO WEST 1/2 11740 11720 11710 12600 13500. Waves 7 to 11 feet subsiding to 1 to 3 feet, and occasionally around 14 feet today. Waves 2 feet or less tonight.

ONTARIO EAST 1/2 11740 11730 11710 11700 11600 11500 11510 11410. Waves 9 to 12 feet subsiding to 1 to 3 feet, and occasionally around 15 feet today. Waves 2 feet or less tonight.