693
FZUS61 KBUF 182002
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
402 PM EDT Fri Sep 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 30.4 inch high will build from southern Quebec tonight
to northern New England Saturday, then off the New England coast
Saturday night. Meanwhile, a weak 29.8 inch low is then forecast to
move east across the eastern Great Lakes Saturday night through
Sunday. A large 30.4 inch high will then slowly build east from
northwest Ontario Sunday night to Quebec by Tuesday and Wednesday,
while gradually strengthening to 30.6 inches.

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

.TONIGHT...North winds 10 to 15 knots becoming east 15 to
20 knots. Waves 2 feet or less building to 3 to 5 feet.
.SATURDAY...East winds 15 to 20 knots diminishing to 10 to
15 knots. Waves 2 to 4 feet.
.SATURDAY NIGHT...East winds 10 to 15 knots. A chance of showers
overnight. Waves 1 to 3 feet.
.SUNDAY...East winds 10 to 15 knots becoming northeast. A chance
of showers. Waves 1 to 3 feet.
.SUNDAY NIGHT...Northeast winds 10 to 15 knots increasing to
15 to 25 knots. Waves 1 to 3 feet building to 3 to 5 feet.
.MONDAY...Northeast winds 15 to 25 knots increasing to 30 knots.
Waves 3 to 6 feet building to 6 to 9 feet. Waves occasionally
around 11 feet.
.TUESDAY...East winds to 30 knots. A chance of showers Tuesday
night. Waves 6 to 9 feet. Waves occasionally around 11 feet.
.WEDNESDAY...East winds 15 to 25 knots. A chance of showers.
Waves 4 to 7 feet subsiding to 3 to 6 feet. Waves occasionally
around 9 feet.

$$

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

.TONIGHT...North winds 10 to 15 knots becoming northeast 15 to
20 knots. Waves 1 to 3 feet building to 2 to 4 feet.
.SATURDAY...Northeast winds 5 to 15 knots. Waves 2 to 4 feet
subsiding to 1 to 3 feet.
.SATURDAY NIGHT...East winds 5 to 10 knots becoming southeast. A
chance of showers overnight. Waves 2 feet or less.
.SUNDAY...Southeast winds 10 to 15 knots becoming northeast.
Showers likely. Waves 1 to 3 feet.
.SUNDAY NIGHT...Northeast winds 15 to 25 knots. A chance of
showers in the evening. Waves 2 to 4 feet building to 3 to
5 feet.
.MONDAY...Northeast winds 15 to 25 knots. Waves 4 to 7 feet
building to 5 to 8 feet. Waves occasionally around 10 feet.
.TUESDAY...East winds 15 to 25 knots. Waves 5 to 8 feet subsiding
to 3 to 6 feet. Waves occasionally around 10 feet.
.WEDNESDAY...East winds 15 to 20 knots becoming southeast. A
chance of showers. Waves 3 to 6 feet subsiding to 2 to 4 feet.

$$

LOZ061-190300-
MAFOR 1821/
ONTARIO WEST 1/2 11810 11110 11120 12220 13210. Waves 1 to 3 feet
building to 3 to 5 feet tonight. Waves 2 to 4 feet Saturday.

ONTARIO EAST 1/2 11810 11110 11120 13110 12100. Waves 1 to 3 feet
building to 2 to 4 feet tonight. Waves 2 to 4 feet subsiding to 1
to 3 feet Saturday.

$$