264
FZUS61 KBUF 121402
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
1002 AM EDT Sat Jul 12 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 29.7 inch low over the Great Lakes will track across
southeast Ontario today then arrive across James Bay tonight while
deepening to 29.3 inches. In the process, this system will push a
warm front across the lake, followed by a slow moving cold front on
Sunday into Sunday night. A 30.1 inch high over the Ohio Valley will
then build across the Lower Great Lakes Monday through Wednesday.

LOZ062-122100-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
1002 AM EDT Sat Jul 12 2025

.THIS AFTERNOON...East winds 5 to 10 knots. Waves 1 foot or less.
.TONIGHT...Southeast winds 5 to 10 knots becoming southwest. A
chance of showers and thunderstorms late. Waves 2 feet or less.
.SUNDAY...Southwest winds 5 to 15 knots. Showers likely with a
chance of thunderstorms. Waves 1 to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 10 knots becoming west.
Showers likely with a chance of thunderstorms in the evening.
Waves 2 feet or less.
.MONDAY...West winds 5 to 15 knots becoming southwest. Waves
2 feet or less.
.TUESDAY...West winds 10 knots or less becoming south. Waves
1 foot or less.
.WEDNESDAY...Southwest winds 5 to 15 knots. A chance of showers
Wednesday night. Waves 2 feet or less.

Winds and waves higher in and near thunderstorms.

$$

LOZ063>065-122100-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
1002 AM EDT Sat Jul 12 2025

.THIS AFTERNOON...Southeast winds 5 to 10 knots becoming east.
Waves 1 foot or less.
.TONIGHT...Southeast winds 5 to 15 knots becoming south 15 to
20 knots. A chance of showers and thunderstorms late. Waves 1 to
3 feet.
.SUNDAY...South winds 5 to 15 knots becoming southwest. Showers
with a chance of thunderstorms. Waves 1 to 3 feet.
.SUNDAY NIGHT...Southwest winds 5 to 10 knots becoming west.
Showers with a chance of thunderstorms in the evening, then a
chance of showers overnight. Waves 1 to 2 feet.
.MONDAY...West winds 5 to 10 knots becoming southwest. Waves
1 foot or less.
.TUESDAY...Southwest winds 5 to 10 knots becoming south. Waves
1 foot or less.
.WEDNESDAY...South winds 5 to 15 knots becoming southwest. A
chance of showers Wednesday night. Waves 2 feet or less.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-122100-
MAFOR 1215/
ONTARIO WEST 1/2 13200 11310 11410 11400 11500 11516. A chance of
thunderstorms overnight and Sunday morning. Waves 2 feet or less.

ONTARIO EAST 1/2 11300 12200 11310 12420 12410. A chance of
showers and thunderstorms Sunday morning. Waves 1 foot or less
this afternoon. Waves 1 to 3 feet tonight and Sunday morning.

$$