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National Weather Service Marine Forecast FZUS61 KBUF

FZUS61 KBUF 181502
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
1002 AM EST Sun Jan 18 2026

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 29.6 inch low will move from near Lake Superior tonight to central Quebec by later Monday night, while pushing an arctic cold front across the lake Monday afternoon. A 30.5 inch high will then slide east across the southeastern states Tuesday and Tuesday night, with a 29.8 inch low then making its way across the central Great Lakes Wednesday, then into central Quebec Thursday.

LOZ062-182200
Lake Ontario open waters from the Niagara River to Hamlin Beach
1002 AM EST Sun Jan 18 2026

GALE WARNING IN EFFECT FROM MONDAY MORNING THROUGH LATE TUESDAY NIGHT

HEAVY FREEZING SPRAY WARNING IN EFFECT FROM MONDAY MORNING THROUGH LATE TUESDAY NIGHT

THIS AFTERNOON
Southwest winds 15 to 25 knots. A chance of snow showers late. Waves 4 to 7 feet subsiding to 3 to 5 feet. Waves occasionally around 9 feet.

TONIGHT
Southwest winds 15 to 20 knots. A chance of snow showers in the evening, then lake effect snow showers after midnight. Waves 3 to 5 feet.

MONDAY
Southwest winds to 30 knots becoming west and increasing to 40 knot gales in the afternoon. Heavy freezing spray. Lake effect snow showers likely. Waves 3 to 6 feet building to 12 to 16 feet. Waves occasionally around 20 feet.

MONDAY NIGHT
West gales to 40 knots diminishing to 30 knots. Heavy freezing spray. Lake effect snow showers. Waves 11 to 16 feet subsiding to 10 to 13 feet. Waves occasionally around 20 feet.

TUESDAY
West gales to 35 knots becoming southwest and diminishing to 30 knots. Heavy freezing spray. Lake effect snow showers. Waves 9 to 13 feet subsiding to 7 to 10 feet. Waves occasionally around 16 feet.

WEDNESDAY
Southwest winds to 30 knots becoming west and increasing to 35 knot gales. Snow showers likely. Waves 4 to 7 feet building to 9 to 13 feet. Waves occasionally around 16 feet.

THURSDAY
West gales to 35 knots diminishing to 30 knots. A chance of snow showers. Waves 9 to 13 feet subsiding to 7 to 10 feet. Waves occasionally around 16 feet.

LOZ063>065-182200
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River
1002 AM EST Sun Jan 18 2026

GALE WARNING IN EFFECT FROM MONDAY MORNING THROUGH LATE TUESDAY NIGHT

HEAVY FREEZING SPRAY WARNING IN EFFECT FROM MONDAY MORNING THROUGH LATE TUESDAY NIGHT

THIS AFTERNOON
Southwest winds 15 to 25 knots. A chance of snow showers, then snow showers likely late. Waves 5 to 8 feet subsiding to 3 to 6 feet. Waves occasionally around 10 feet.

TONIGHT
Southwest winds 15 to 25 knots. A chance of snow showers through the early overnight, then lake effect snow showers likely late. Waves 3 to 6 feet.

MONDAY
Southwest winds to 30 knots increasing to 40 knot gales in the afternoon. Heavy freezing spray. Lake effect snow showers likely. Waves 4 to 7 feet building to 13 to 17 feet. Waves occasionally around 22 feet.

MONDAY NIGHT
West gales to 40 knots diminishing to 30 knots. Heavy freezing spray. Lake effect snow showers. Waves 15 to 20 feet subsiding to 12 to 16 feet. Waves occasionally around 26 feet.

TUESDAY
West gales to 35 knots becoming southwest and diminishing to 30 knots. Heavy freezing spray. Lake effect snow showers. Waves 10 to 15 feet subsiding to 8 to 11 feet. Waves occasionally around 19 feet.

WEDNESDAY
South winds to 30 knots becoming southwest and increasing to 35 knot gales. Snow showers likely. Waves 5 to 9 feet building to 10 to 15 feet. Waves occasionally around 19 feet.

THURSDAY
West gales to 35 knots diminishing to 30 knots. A chance of snow showers. Waves 10 to 15 feet subsiding to 9 to 12 feet. Waves occasionally around 19 feet.

LOZ061-182200
MAFOR 1816/ ONTARIO WEST 1/2...GALE WARNING IN EFFECT...14520 11520 11527 12537. Waves 4 to 7 feet subsiding to 3 to 5 feet, and occasionally around 9 feet this afternoon. Waves 3 to 5 feet tonight. Waves 3 to 6 feet building to 4 to 7 feet, and occasionally around 9 feet Monday morning.

ONTARIO EAST 1/2...GALE WARNING IN EFFECT...11520 11527 14520 11531 11537. Waves 5 to 8 feet subsiding to 3 to 6 feet, and occasionally around 10 feet this afternoon. Waves 3 to 6 feet tonight. Waves 5 to 8 feet, and occasionally around 10 feet Monday morning.