380
FZUS61 KBUF 190803
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
402 AM EDT Sun Jul 19 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 secondary cold front will cross Lake Ontario tonight. A 30.0
inch area of high pressure will build across the Great Lakes
from west to east Sunday into Monday, followed by a warm front
crossing the lake Monday night and another cold front Tuesday
night, with these fronts attached to a 29.4 inch area of low
pressure near James Bay. A secondary cold front will cross the
lake Wednesday, with a 30.1 inch high building across the lower
Great Lakes region Wednesday night through Friday.

LOZ062-191500-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
402 AM EDT Sun Jul 19 2026

.TODAY...North winds 5 to 15 knots becoming west. Patchy smoke
early. Waves 1 to 3 feet subsiding to 1 foot or less.
.TONIGHT...West winds 10 knots or less becoming north. Waves
2 feet or less.
.MONDAY...Light and variable winds becoming southeast 5 to
10 knots. Waves 1 foot or less.
.MONDAY NIGHT...Southeast winds 5 to 15 knots becoming south.
Waves 2 feet or less.
.TUESDAY...South winds 15 to 20 knots becoming west. Showers with
a chance of thunderstorms. Waves 2 to 4 feet building to 3 to
5 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots. A chance of showers
during the day. Waves 3 to 6 feet building to 4 to 7 feet, then
subsiding to 3 to 5 feet. Waves occasionally around 9 feet.
.THURSDAY...Northwest winds 5 to 15 knots becoming southwest.
Waves 1 to 3 feet subsiding to 1 foot or less.

Winds and waves higher in and near thunderstorms.

$$

LOZ063>065-191500-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
402 AM EDT Sun Jul 19 2026

.TODAY...North winds 15 to 20 knots becoming west 5 to 15 knots.
Patchy smoke early. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.TONIGHT...West winds 5 to 15 knots. Waves 1 to 3 feet.
.MONDAY...West winds 10 knots or less becoming east. Waves 1 foot
or less.
.MONDAY NIGHT...East winds 10 knots or less becoming south and
increasing to 15 to 20 knots overnight. Waves 1 foot or less
building to 2 to 4 feet.
.TUESDAY...South winds 15 to 20 knots becoming west. Showers with
a chance of thunderstorms. Waves 3 to 5 feet.
.WEDNESDAY...West winds 15 to 25 knots becoming northwest.
Showers likely during the day. Waves 5 to 8 feet subsiding to
3 to 6 feet. Waves occasionally around 10 feet.
.THURSDAY...Northwest winds 5 to 15 knots becoming southwest.
Waves 2 to 4 feet subsiding to 1 foot or less.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-191500-
MAFOR 1909/
ONTARIO WEST 1/2 12810 11700 11600 11610 11600 12700. Waves 2 to
4 feet subsiding to 1 foot or less today. Waves 2 feet or less
tonight.

ONTARIO EAST 1/2 11820 11710 11700 13610 12600. Waves 3 to 5 feet
subsiding to 1 to 3 feet today. Waves 1 to 3 feet tonight.

$$