021
FZUS61 KBUF 210802
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
402 AM EDT Fri Aug 21 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 30.1 inch high over southern Quebec will slide across New England
today, then into the Canadian Maritimes Saturday. An elongated 29.7
inch low will slowly make its way from the central Great Lakes to
western Quebec Saturday and Sunday, while pushing its associated
warm and cold fronts across the lake between Saturday night and
Sunday morning. The low will wobble about western Quebec through
Monday, then wil eject northeastward into Labrador on Tuesday while
a 30.1 inch high builds eastward across the Ohio Valley.

LOZ062-211500-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
402 AM EDT Fri Aug 21 2026

.TODAY...Northeast winds 10 knots or less becoming east. Waves
1 foot or less.
.TONIGHT...East winds around 10 knots becoming southeast. Waves
1 to 2 feet.
.SATURDAY...Southeast winds 5 to 10 knots becoming east. A chance
of showers and thunderstorms in the afternoon. Waves 1 foot or
less.
.SATURDAY NIGHT...Southeast winds 5 to 10 knots becoming
southwest. Showers with a chance of thunderstorms. Waves 1 to
2 feet.
.SUNDAY...West winds 10 to 15 knots increasing to 15 to 20 knots.
Showers with a chance of thunderstorms. Waves 1 to 3 feet
building to 3 to 5 feet, then subsiding to 2 to 4 feet.
.MONDAY...West winds 15 to 20 knots diminishing to 10 to
15 knots. A chance of showers. Waves 2 to 4 feet.
.TUESDAY...West winds 5 to 15 knots becoming southwest. Waves
1 to 3 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ063>065-211500-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
402 AM EDT Fri Aug 21 2026

.TODAY...South winds 10 knots or less becoming northeast. Waves
1 foot or less.
.TONIGHT...Northeast winds 5 to 10 knots becoming southeast.
Waves 1 foot or less.
.SATURDAY...Southeast winds 5 to 15 knots. A chance of showers in
the afternoon. Waves 2 feet or less.
.SATURDAY NIGHT...Southeast winds 5 to 10 knots becoming south
and increasing to 15 to 20 knots. Showers with a chance of
thunderstorms in the evening, then showers overnight. Waves 1 to
3 feet building to 2 to 4 feet.
.SUNDAY...South winds 15 to 20 knots becoming west. Showers with
a chance of thunderstorms. Waves 2 to 4 feet building to 3 to
5 feet.
.MONDAY...West winds 15 to 20 knots. Showers during the day, then
a chance of showers Monday night. Waves 3 to 5 feet subsiding to
2 to 4 feet.
.TUESDAY...West winds 15 to 20 knots becoming southwest 5 to
15 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-211500-
MAFOR 2109/
ONTARIO WEST 1/2 11800 14200 11200 12300. Waves 2 feet or less.

ONTARIO EAST 1/2 11400 11300 11200 13100 11200 11300. Waves 1
foot or less.

$$