198
FZUS61 KBUF 182002
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
402 PM EDT Tue Aug 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 ridge of high pressure averaging 30.0 inches will
drift to the eastern seaboard tonight. A cold front will then move
east across Lake Ontario on Wednesday. Behind the front, a ridge of
high pressure averaging 30.1 inches builds from the upper Great
Lakes Thursday to the lower Great Lakes Friday. This high will drift
east to the Canadian Maritimes Saturday as a 29.7 inch low moves
into northwest Ontario province.

LOZ062-190300-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
402 PM EDT Tue Aug 18 2026

.TONIGHT...South winds 5 to 10 knots becoming southwest 10 to
15 knots. A chance of showers after midnight. Waves 2 feet or
less.
.WEDNESDAY...West winds 5 to 15 knots. Showers likely in the
morning, then a chance of showers early in the afternoon. Waves
2 feet or less.
.WEDNESDAY NIGHT...Northwest winds 5 to 10 knots. Waves 1 foot or
less.
.THURSDAY...Northwest winds 10 knots or less becoming west. Waves
1 foot or less.
.THURSDAY NIGHT...Northwest winds 10 knots or less becoming
northeast. Waves 1 foot or less.
.FRIDAY...East winds 10 knots or less becoming southeast. Waves
1 foot or less.
.SATURDAY...South winds 5 to 10 knots becoming southwest. Showers
likely with a chance of thunderstorms. Waves 2 feet or less.
.SUNDAY...West winds 10 to 15 knots becoming northwest 15 to
20 knots. Showers likely during the day, then a chance of showers
Sunday night. Waves 1 to 3 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ063>065-190300-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
402 PM EDT Tue Aug 18 2026

.TONIGHT...Southwest winds 10 to 15 knots. Waves 2 feet or less.
.WEDNESDAY...Southwest winds 10 to 15 knots becoming west. A
chance of showers early, then showers likely. A chance of showers
late. Waves 1 to 3 feet.
.WEDNESDAY NIGHT...West winds 5 to 10 knots becoming northwest.
Waves 1 to 2 feet.
.THURSDAY...Northwest winds 5 to 10 knots becoming west. Waves
1 foot or less.
.THURSDAY NIGHT...West winds 10 knots or less becoming north.
Waves 1 foot or less.
.FRIDAY...East winds 10 knots or less becoming southeast. Waves
1 foot or less.
.SATURDAY...South winds 5 to 15 knots. A chance of showers and
thunderstorms during the day, then showers with a chance of
thunderstorms Saturday night. Waves 2 feet or less.
.SUNDAY...Southwest winds 10 to 15 knots becoming northwest 15 to
20 knots. Showers with a chance of thunderstorms. Waves 1 to
3 feet building to 2 to 4 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-190300-
MAFOR 1821/
ONTARIO WEST 1/2 11500 11420 12510 13610 11600. A chance of
showers Wednesday morning. Waves 2 feet or less.

ONTARIO EAST 1/2 11510 11500 14510 11616 11610. Waves 2 feet or
less tonight. Waves 1 to 3 feet Wednesday.

$$