433
FZUS61 KBUF 210202
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
1002 PM EDT Thu Aug 20 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 ridge averaging 30.1 inches affects Lake Ontario through Saturday
as the embedded high pressure center moves from the Upper Great
Lakes toward the Canadian Maritimes. A warm front should sweep
northward across Lake Ontario Saturday night and a cold front should
sweep eastward across the lake late Saturday night through Sunday as
a low of 29.7 inches moves from the Upper Great Lakes toward
southern Quebec. Behind the low, a weak trough averaging 29.9 inches
should linger over Lake Ontario through Monday before a ridge
averaging 30.0 inches builds from near the Ohio Valley on Tuesday.

LOZ062-210900-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
1002 PM EDT Thu Aug 20 2026

.OVERNIGHT...Northwest winds 5 to 10 knots becoming
northeast. Waves 2 feet or less.
.FRIDAY...East winds 10 knots or less. Waves 1 foot or less.
.FRIDAY NIGHT...East winds 5 to 10 knots becoming southeast.
Waves 2 feet or less.
.SATURDAY...Southeast winds 10 knots or less 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 in the evening,
then showers overnight. Waves 1 to 2 feet.
.SUNDAY...West winds 15 to 20 knots. Showers likely with a chance
of thunderstorms. Waves 1 to 3 feet building to 2 to 4 feet.
.MONDAY...West winds 15 to 20 knots diminishing to 10 to
15 knots. A chance of showers during the day. Waves 2 to 4 feet
subsiding to 1 to 3 feet.
.TUESDAY...West winds 5 to 15 knots becoming southwest. Waves
1 to 2 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ063>065-210900-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
1002 PM EDT Thu Aug 20 2026

.OVERNIGHT...Northwest winds 5 to 15 knots becoming east.
Waves 2 feet or less.
.FRIDAY...East winds 10 knots or less becoming northeast. Waves
1 foot or less.
.FRIDAY NIGHT...Northeast winds 5 to 10 knots becoming southeast.
Waves 1 foot or less.
.SATURDAY...Southeast winds 5 to 15 knots. A chance of showers
and thunderstorms in the afternoon. Waves 2 feet or less.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots becoming south
15 to 20 knots. Showers likely with a chance of thunderstorms in
the evening, then showers likely overnight. Waves 1 to 3 feet.
.SUNDAY...Southwest winds 15 to 20 knots becoming west. Showers
with a chance of thunderstorms. Waves 1 to 3 feet building to
2 to 4 feet.
.MONDAY...West winds 15 to 25 knots diminishing to 10 to
15 knots. Showers likely during the day, then a chance of showers
Monday night. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.TUESDAY...West winds 5 to 15 knots becoming southwest. Waves
1 to 3 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-210900-
MAFOR 2103/
ONTARIO WEST 1/2 11810 11100 15200. Waves 2 feet or less.

ONTARIO EAST 1/2 11800 11100 12200 14100. Waves 1 foot or less.

$$