207
FZUS61 KBUF 190203
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
1003 PM EDT Sat Jul 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 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.

LOZ062-190900-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
1003 PM EDT Sat Jul 18 2026

.OVERNIGHT...Northwest winds 15 to 20 knots becoming north.
Patchy smoke. Waves 3 to 5 feet subsiding to 2 to 4 feet.
.SUNDAY...North winds 5 to 15 knots becoming west. Patchy smoke
early. Waves 1 to 3 feet subsiding to 1 foot or less.
.SUNDAY NIGHT...West winds 10 knots or less becoming northwest.
Waves 1 foot or less.
.MONDAY...Southwest winds 10 knots or less becoming south. 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.
.WEDNESDAY...West winds 15 to 25 knots becoming northwest. 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>065-190900-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
1003 PM EDT Sat Jul 18 2026

.OVERNIGHT...Northwest winds 15 to 20 knots becoming north.
Patchy smoke. Waves 4 to 7 feet subsiding to 3 to 6 feet. Waves
occasionally around 9 feet.
.SUNDAY...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.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves 1 to 3 feet.
.MONDAY...West winds 10 knots or less becoming southeast. Waves
1 foot or less.
.MONDAY NIGHT...Southeast winds 10 knots or less becoming south
and increasing to 15 to 20 knots overnight. Waves 1 to 3 feet.
.TUESDAY...South winds 15 to 20 knots becoming southwest. Showers
with a chance of thunderstorms. Waves 2 to 4 feet.
.WEDNESDAY...West winds 15 to 25 knots. Showers likely during the
day, then a chance of showers Wednesday night. Waves 3 to 6 feet
building to 5 to 8 feet, then subsiding to 3 to 6 feet. Waves
occasionally around 10 feet.
.THURSDAY...Northwest winds 5 to 15 knots becoming west. Waves
2 to 4 feet subsiding to 1 foot or less.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-190900-
MAFOR 1903/
ONTARIO WEST 1/2 11720 11820 12810 11700 13600. Waves 3 to 5 feet
overnight. Waves 2 to 4 feet subsiding to 1 foot or less Sunday.
Waves 2 feet or less Sunday evening.

ONTARIO EAST 1/2 11720 12820 11810 11700 13610. Waves 3 to 6 feet
overnight. Waves 2 to 4 feet subsiding to 1 to 3 feet Sunday.
Waves 1 to 3 feet Sunday evening.

$$