568
FZUS61 KBUF 181402
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
1002 AM 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
build across the lower Great Lakes today. The ridge exits eastward
tonight before a cold front sweeps eastward across Lake Ontario on
Wednesday. Behind the front, a ridge averaging 30.1 inches builds
from the western Great Lakes through Friday. This ridge should exit
eastward Friday night through Saturday and allow a warm front to
drift northward across Lake Ontario.

LOZ062-182100-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
1002 AM EDT Tue Aug 18 2026

.THIS AFTERNOON...West winds 10 knots or less becoming southwest.
Waves 1 foot or less.
.TONIGHT...Southwest winds 10 to 15 knots. A chance of showers
after midnight. Showers likely late. Waves 1 to 3 feet.
.WEDNESDAY...Southwest winds 5 to 10 knots becoming west. A
chance of showers. Waves 1 to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 10 knots. Waves 2 feet or
less.
.THURSDAY...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. A
chance of showers during the day, then showers likely Saturday
night. Waves 2 feet or less.

$$

LOZ063>065-182100-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
1002 AM EDT Tue Aug 18 2026

.THIS AFTERNOON...West winds 10 knots or less. Waves 1 foot or
less.
.TONIGHT...Southwest winds 5 to 15 knots. A chance of showers
late. Waves 2 feet or less.
.WEDNESDAY...Southwest winds 10 to 15 knots becoming west.
Showers likely in the morning, then a chance of showers and
thunderstorms in the afternoon. Waves 1 to 3 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots becoming northwest.
Waves 1 to 3 feet.
.THURSDAY...Northwest winds 5 to 10 knots becoming north. Waves
1 foot or less.
.FRIDAY...East winds 10 knots or less becoming southeast. Waves
1 foot or less.
.SATURDAY...Southeast winds 5 to 15 knots becoming south. A
chance of showers during the day, then showers likely Saturday
night. Waves 2 feet or less.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-182100-
MAFOR 1815/
ONTARIO WEST 1/2 12600 15510. A chance of showers overnight and
Wednesday morning. Waves 1 foot or less this afternoon. Waves 1
to 3 feet tonight and Wednesday morning.

ONTARIO EAST 1/2 13600 12500 13510. A chance of showers Wednesday
morning. Waves 2 feet or less this afternoon and tonight. Waves 1
to 3 feet Wednesday morning.

$$