539
FZUS61 KBUF 182002
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
402 PM EDT Mon Aug 18 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 slowly move east across central
Quebec tonight, while remaining ridged south/southwestward across
the Lower Great Lakes. At the same time, a 29.9 inch low will move
into the Central Great Lakes tonight, then will weaken and stall out
across the Lower Lakes Tuesday and Tuesday night. A lingering
surface trough will remain near the Lake Wednesday, while Hurricane
Erin curves north/northeastward, with center of the storm remaining
well off the Southeast and Carolina coastline. A 30.1 inch high will
then build across the Great Lakes region Thursday through Friday
night.

LOZ062-190300-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
402 PM EDT Mon Aug 18 2025

.TONIGHT...East winds 10 to 15 knots. Waves 2 to 4 feet subsiding
to 1 to 2 feet.
.TUESDAY...Southeast winds 5 to 10 knots becoming east. A chance
of showers late. Waves 1 to 2 feet.
.TUESDAY NIGHT...East winds around 10 knots becoming south.
Showers likely. Waves around 1 foot.
.WEDNESDAY...Southeast winds 5 to 10 knots becoming northeast. A
chance of showers. Waves 1 foot or less.
.WEDNESDAY NIGHT...East winds 15 to 20 knots becoming northeast
10 to 15 knots. A chance of showers in the evening. Waves 1 to
3 feet.
.THURSDAY...Northeast winds 5 to 15 knots becoming east. Waves
1 to 3 feet.
.FRIDAY...East winds 5 to 10 knots becoming south. Waves around
1 foot.
.SATURDAY...Southwest winds 10 to 15 knots becoming west. A
chance of showers. Waves 1 to 2 feet.

$$

LOZ063>065-190300-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
402 PM EDT Mon Aug 18 2025

.TONIGHT...Northeast winds 15 to 20 knots becoming southeast.
Waves 1 to 3 feet.
.TUESDAY...Southeast winds 5 to 10 knots becoming east. Waves
2 feet or less.
.TUESDAY NIGHT...East winds 5 to 15 knots becoming south. Showers
likely. Waves 1 to 3 feet.
.WEDNESDAY...South winds 5 to 15 knots becoming east. Showers
likely in the morning, then a chance of showers in the afternoon.
Waves 1 to 3 feet subsiding to 1 foot or less.
.WEDNESDAY NIGHT...East winds 10 to 15 knots becoming northeast.
A chance of showers in the evening. Waves 1 to 3 feet.
.THURSDAY...Northeast winds 5 to 15 knots. Waves 1 to 3 feet.
.FRIDAY...Northeast winds 10 knots or less becoming south. Waves
1 foot or less.
.SATURDAY...South winds 5 to 15 knots becoming southwest. A
chance of showers and thunderstorms during the day, then showers
likely with a chance of thunderstorms Saturday night. Waves 1 to
3 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-190300-
MAFOR 1821/
ONTARIO WEST 1/2 14210 12300 12200. Waves 2 to 4 feet subsiding
to 1 to 2 feet tonight. Waves 1 to 2 feet Tuesday.

ONTARIO EAST 1/2 12120 11220 11320 13300 11200. Waves 1 to 3 feet
tonight. Waves 2 feet or less Tuesday.

$$