875
FZUS61 KBUF 200902
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
402 AM EST Thu Nov 20 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 30.3 inch high over the lower Great Lakes will slide
out across New England through tonight. A 29.5 inch surface low near
James Bay will swing a cold front east across the lake Friday, with
a 30.1 inch high building over the Ohio Valley and lower Great Lakes
Saturday. A 29.5 inch low will then move from northern Ontario to
James Bay Sunday, while pushing its warm front across the lake
Saturday night, followed by its trailing cold front Sunday. A 30.2
inch high is forecast to build across the Ohio Valley Monday.

LOZ062-201600-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
402 AM EST Thu Nov 20 2025

.TODAY...Southeast winds 5 to 10 knots. Waves 1 foot or less.
.TONIGHT...South winds 10 knots or less becoming southwest 10 to
15 knots. Waves 2 feet or less.
.FRIDAY...Southwest winds 10 to 15 knots becoming west. Waves
1 to 3 feet building to 2 to 4 feet.
.FRIDAY NIGHT...West winds 10 to 15 knots becoming northwest.
Waves 1 to 3 feet.
.SATURDAY...North winds 5 to 10 knots becoming southwest. Waves
2 feet or less.
.SUNDAY...Southwest winds 15 to 20 knots becoming west. Waves
1 to 3 feet building to 3 to 5 feet.
.MONDAY...West winds 15 to 20 knots becoming southeast and
diminishing to 5 to 10 knots. Waves 2 to 4 feet subsiding to 1 to
3 feet.

$$

LOZ063-201600-
Lake Ontario open waters from Hamlin Beach to Sodus Bay-
402 AM EST Thu Nov 20 2025

.TODAY...Southeast winds 5 to 10 knots. Waves 1 foot or less.
.TONIGHT...South winds 5 to 15 knots becoming southwest. Waves
2 feet or less.
.FRIDAY...Southwest winds 15 to 20 knots becoming west. Waves
1 to 3 feet building to 2 to 4 feet.
.FRIDAY NIGHT...West winds 10 to 15 knots becoming northwest.
Waves 2 to 4 feet.
.SATURDAY...North winds 5 to 15 knots becoming west. Waves 1 to
3 feet.
.SUNDAY...Southwest winds 10 to 15 knots becoming west 15 to
20 knots. Waves 1 to 2 feet building to 3 to 6 feet.
.MONDAY...West winds 15 to 20 knots becoming southeast 10 to
15 knots. Waves 3 to 5 feet subsiding to 1 to 3 feet.

$$

LOZ064-065-201600-
Lake Ontario open waters from Sodus Bay to the Saint Lawrence
River-
402 AM EST Thu Nov 20 2025

.TODAY...Southeast winds 5 to 10 knots. Waves 1 foot or less.
.TONIGHT...Southeast winds 5 to 15 knots becoming southwest.
Waves 1 to 3 feet.
.FRIDAY...South winds 15 to 20 knots becoming west. A chance of
showers. Waves 2 to 4 feet building to 3 to 5 feet.
.FRIDAY NIGHT...West winds 10 to 15 knots becoming northwest. A
chance of rain showers in the evening. Waves 2 to 4 feet
subsiding to 1 to 3 feet.
.SATURDAY...North winds 5 to 15 knots becoming west. Waves 1 to
3 feet.
.SUNDAY...Southwest winds 10 to 15 knots becoming west 15 to
20 knots. A chance of rain showers. Waves 1 to 3 feet building to
3 to 6 feet.
.MONDAY...Northwest winds 15 to 20 knots becoming south 10 to
15 knots. A chance of rain showers. Waves 3 to 6 feet subsiding
to 1 to 3 feet.

$$

LOZ061-201600-
MAFOR 2010/
ONTARIO WEST 1/2 12300 11200 12300 11400 11500 11510. Waves 2
feet or less.

ONTARIO EAST 1/2 14300 11300 11400 12510. Waves 1 foot or less
today. Waves 1 to 3 feet tonight.

$$