683
FZUS61 KBUF 202002
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
402 PM EDT Sat Sep 20 2025

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 continue to build from
southwestern Quebec to New England tonight, before sliding off the
New England coast Sunday. Broad low pressure averaging 29.8 inches
will push across the Upper Great Lakes and into Quebec Monday and
Tuesday, while pushing a wavy cold frontal boundary across the lower
Great Lakes region. A 30.3 inch high will build across Ontario and
Quebec Tuesday night through Thursday, while a 29.9 inch low
develops across the lower Ohio Valley.

LOZ062-210300-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
402 PM EDT Sat Sep 20 2025

.TONIGHT...East winds 15 to 20 knots. Waves 3 to 6 feet.
.SUNDAY...Southeast winds 10 to 15 knots becoming east. Waves
2 to 4 feet subsiding to 1 to 3 feet.
.SUNDAY NIGHT...Southeast winds 10 to 15 knots becoming south.
Showers likely. Waves 1 to 2 feet.
.MONDAY...South winds 10 to 15 knots becoming southwest. Showers
likely in the morning, then showers likely with a chance of
thunderstorms in the afternoon. Waves 1 to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 10 knots. Showers likely
with a chance of thunderstorms in the evening, then showers
likely overnight. Waves 1 to 2 feet.
.TUESDAY...West winds 5 to 10 knots becoming north. Showers
likely. Waves 1 foot or less.
.WEDNESDAY...Northeast winds 5 to 10 knots becoming east. A
chance of showers. Waves 1 to 2 feet.
.THURSDAY...East winds around 10 knots becoming southeast. A
chance of showers. Waves 1 to 2 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ063>065-210300-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
402 PM EDT Sat Sep 20 2025

.TONIGHT...Northeast winds 15 to 20 knots becoming southeast
10 to 15 knots. Waves 2 to 4 feet building to 3 to 5 feet, then
subsiding to 2 to 4 feet.
.SUNDAY...Southeast winds 10 to 15 knots. Waves 1 to 3 feet.
.SUNDAY NIGHT...Southeast winds 10 to 15 knots becoming south
15 to 20 knots. A chance of showers overnight. Waves 1 to 3 feet
building to 2 to 4 feet.
.MONDAY...South winds 15 to 20 knots becoming southwest 5 to
15 knots. Showers likely with a chance of thunderstorms. Waves
2 to 4 feet subsiding to 1 to 3 feet.
.MONDAY NIGHT...Southwest winds 5 to 10 knots. Showers likely
with a chance of thunderstorms in the evening, then showers
likely overnight. Waves 1 foot or less.
.TUESDAY...Southwest winds 5 to 10 knots becoming north. Showers
likely. Waves 1 foot or less.
.WEDNESDAY...Northeast winds 5 to 10 knots becoming east. A
chance of showers. Waves 2 feet or less.
.THURSDAY...East winds 5 to 10 knots becoming southeast. A chance
of showers. Waves 2 feet or less.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-210300-
MAFOR 2021/
ONTARIO WEST 1/2 14220 12310 12200. Waves 3 to 6 feet tonight.
Waves 2 to 4 feet subsiding to 1 to 3 feet Sunday.

ONTARIO EAST 1/2 11110 11120 11220 14310 11310. Waves 2 to 4 feet
building to 3 to 5 feet, then subsiding to 2 to 4 feet tonight.
Waves 1 to 3 feet Sunday.

$$