487
FZUS61 KBUF 170803
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
402 AM EDT Sun Aug 17 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 29.8 inch wave of low pressure and cold front will
move across the lake today. A 29.9 inch low will move into the
Central Great Lakes Monday, then stall over the lake Tuesday. A 30.2
inch surface high will move north of the lake during this time. A
surface trough will remain near the lake Wednesday, while Hurricane
Erin moves well off the east coast. Another 30.1 inch high will move
across the Great Lakes region Thursday through Friday.

LOZ062-171500-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
402 AM EDT Sun Aug 17 2025

.TODAY...West winds 10 to 15 knots becoming northeast 15 to
20 knots. Showers likely with a chance of thunderstorms through
early afternoon, then a chance of showers late. Waves 1 to 2 feet
building to 2 to 4 feet.
.TONIGHT...Northeast winds 15 to 25 knots. A chance of showers
early. Waves 3 to 6 feet building to 5 to 7 feet. Waves
occasionally around 9 feet.
.MONDAY...Northeast winds 15 to 25 knots becoming east. Waves
4 to 7 feet subsiding to 2 to 4 feet. Waves occasionally around
9 feet.
.MONDAY NIGHT...East winds 10 to 15 knots. Waves 2 to 4 feet.
.TUESDAY...East winds around 10 knots. A chance of showers during
the day, then showers likely with a chance of thunderstorms
Tuesday night. Waves 1 to 2 feet.
.WEDNESDAY...East winds 10 to 15 knots becoming northeast.
Showers likely during the day, then a chance of showers Wednesday
night. Waves 1 to 3 feet.
.THURSDAY...Northeast winds 5 to 15 knots. Waves 1 to 3 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ063>065-171500-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
402 AM EDT Sun Aug 17 2025

.TODAY...Southwest winds 5 to 15 knots becoming northeast and
increasing to 15 to 25 knots. A chance of showers this morning,
then showers likely early this afternoon. A chance of showers
late. Waves 2 feet or less building to 4 to 7 feet. Waves
occasionally around 9 feet.
.TONIGHT...Northeast winds 20 to 25 knots. Waves 3 to 6 feet
building to 4 to 7 feet. Waves occasionally around 9 feet.
.MONDAY...Northeast winds 15 to 25 knots diminishing to 10 to
15 knots. Waves 4 to 7 feet subsiding to 2 to 4 feet. Waves
occasionally around 9 feet.
.MONDAY NIGHT...Northeast winds 10 to 15 knots becoming east.
Waves 1 to 3 feet.
.TUESDAY...Southeast winds 5 to 15 knots. A chance of showers
during the day, then showers likely with a chance of
thunderstorms Tuesday night. Waves 2 feet or less.
.WEDNESDAY...Southeast winds 10 to 15 knots becoming northeast.
Showers likely during the day, then a chance of showers Wednesday
night. Waves 1 to 3 feet.
.THURSDAY...Northeast winds 5 to 15 knots. Waves 1 to 3 feet
subsiding to 1 foot or less.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-171500-
MAFOR 1709/
ONTARIO WEST 1/2 11600 11606 11826 11126 12120 12130. Waves 1 to
2 feet building to 3 to 5 feet today. Waves 3 to 6 feet building
to 5 to 7 feet, and occasionally around 9 feet tonight.

ONTARIO EAST 1/2 11500 11600 12830 14130. A chance of showers
today. Waves 2 feet or less building to 4 to 7 feet, and
occasionally around 9 feet today. Waves 3 to 6 feet building to 4
to 7 feet, and occasionally around 9 feet tonight.

$$