499
FZUS61 KBUF 310902
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
402 AM EST Wed Dec 31 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 29.8 inch low will pass just north of Lake Ontario
this afternoon before reaching the Saint Lawrence Valley tonight. A
secondary 29.6 inch coastal low will develop over the Gulf of Maine
Thursday morning, with this low deepening to 28.8 inches as it moves
north across the Canadian Maritimes Thursday night through Friday,
then to northern Quebec by Saturday. A 30.3 inch high will then
build from the western Great Lakes Sunday to the lower Great Lakes
by early Monday.

LOZ062-311600-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
402 AM EST Wed Dec 31 2025

.TODAY...West winds 15 to 25 knots. A chance of snow showers this
morning, then snow showers likely early this afternoon. Lake
effect snow late. Waves 5 to 9 feet subsiding to 4 to 6 feet.
Waves occasionally around 11 feet.
.TONIGHT...Northwest winds 15 to 20 knots. Lake effect snow
early, then lake effect snow showers likely late in the evening.
A chance of snow showers after midnight. Waves 3 to 5 feet.
.THURSDAY...Northwest winds 15 to 25 knots becoming west. Lake
effect snow showers likely. Waves 3 to 5 feet building to 3 to
6 feet.
.THURSDAY NIGHT...West winds 20 to 25 knots. Lake effect snow
showers likely. Waves 5 to 8 feet. Waves occasionally around
10 feet.
.FRIDAY...West winds 20 to 25 knots. Snow showers likely during
the day, then a chance of snow showers Friday night. Waves 5 to
8 feet. Waves occasionally around 10 feet.
.SATURDAY...Northwest winds 15 to 20 knots becoming west 10 to
15 knots. A chance of snow showers. Waves 3 to 6 feet subsiding
to 1 to 2 feet.
.SUNDAY...West winds 10 to 15 knots. Waves 1 to 3 feet.

$$

LOZ063>065-311600-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
402 AM EST Wed Dec 31 2025

.TODAY...West winds 15 to 25 knots. Lake effect snow. Waves 6 to
10 feet subsiding to 3 to 6 feet. Waves occasionally around
13 feet.
.TONIGHT...Northwest winds 15 to 20 knots. Lake effect snow in
the evening, then lake effect snow showers likely after midnight.
A chance of snow showers late. Waves 3 to 6 feet.
.THURSDAY...Northwest winds 15 to 20 knots becoming west. Lake
effect snow showers. Waves 3 to 6 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots. Lake effect snow
showers. Waves 5 to 8 feet building to 6 to 9 feet. Waves
occasionally around 11 feet.
.FRIDAY...West winds 15 to 25 knots becoming northwest. Lake
effect snow showers. Waves 6 to 10 feet subsiding to 5 to 8 feet.
Waves occasionally around 13 feet.
.SATURDAY...Northwest winds 15 to 20 knots diminishing to 10 to
15 knots. A chance of snow showers. Waves 4 to 7 feet subsiding
to 1 to 3 feet. Waves occasionally around 9 feet.
.SUNDAY...West winds 10 to 15 knots. A chance of snow showers.
Waves 1 to 3 feet.

$$

LOZ061-311600-
MAFOR 3110/
ONTARIO WEST 1/2 12630 11620 12627 11727 12720. Waves 5 to 9 feet
subsiding to 4 to 7 feet, and occasionally around 11 feet today.
Waves 3 to 6 feet tonight.

ONTARIO EAST 1/2 12637 12627 11617 12727 11720. A chance of lake
effect snow showers overnight. Waves 6 to 10 feet subsiding to 3
to 6 feet, and occasionally around 13 feet today. Waves 3 to 6
feet tonight.

$$