315
FZUS61 KBUF 171402
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
1002 AM EDT Tue Jun 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...
An area of low pressure over the western Great Lakes will deepen to
29.3 inches today as it advances northeastward across eastern
Ontario, Canada. This deepening low will encourage a warm front to
lift near the Lake this afternoon. This low will further deepen to
29.2 inches Wednesday as it advances across Quebec, while leaving
its cold front back across the central Great Lakes. A wave of low
pressure averaging 29.5 is forecast to track northeast along this
frontal boundary while dragging its cold front across the Lake
Thursday afternoon. A 30.1 inch high builds northeast across the
Lake Friday, and exits east of the Lake on Saturday.

LOZ062-172100-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
1002 AM EDT Tue Jun 17 2025

.THIS AFTERNOON...East winds 10 knots or less. Waves 1 foot or
less.
.TONIGHT...Southeast winds 5 to 10 knots becoming southwest.
Waves around 1 foot.
.WEDNESDAY...Southwest winds 5 to 10 knots becoming south. A
chance of showers in the morning, then a chance of showers and
thunderstorms in the afternoon. Waves 1 foot or less.
.WEDNESDAY NIGHT...South winds 5 to 15 knots becoming southwest.
Showers likely with a chance of thunderstorms. Waves 1 to 3 feet.
.THURSDAY...Southwest winds 15 to 20 knots becoming west 10 to
15 knots. Showers likely with a chance of thunderstorms during
the day, then a chance of showers Thursday night. Waves 2 to
4 feet building to 3 to 5 feet, then subsiding to 2 to 4 feet.
.FRIDAY...West winds 5 to 10 knots becoming southwest. A chance
of showers Friday night. Waves 1 to 2 feet.
.SATURDAY...South winds 10 to 15 knots becoming southwest. A
chance of showers and thunderstorms. Waves 1 to 2 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ063>065-172100-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
1002 AM EDT Tue Jun 17 2025

.THIS AFTERNOON...Southeast winds 5 to 10 knots. Waves 1 foot or
less.
.TONIGHT...Southeast winds 10 to 15 knots becoming south. A
chance of showers after midnight. Waves 2 feet or less.
.WEDNESDAY...Southwest winds 5 to 10 knots. A chance of showers
in the morning, then a chance of showers and thunderstorms in the
afternoon. Waves 2 feet or less.
.WEDNESDAY NIGHT...South winds 10 knots or less increasing to
10 to 15 knots. A chance of showers and thunderstorms in the
evening, then showers likely with a chance of thunderstorms
overnight. Waves 2 feet or less.
.THURSDAY...Southwest winds 15 to 20 knots becoming west 10 to
15 knots. Showers likely with a chance of thunderstorms during
the day, then a chance of showers and thunderstorms Thursday
night. Waves 2 to 4 feet building to 3 to 5 feet, then subsiding
to 2 to 4 feet.
.FRIDAY...West winds 5 to 15 knots. Waves 1 to 3 feet.
.SATURDAY...South winds 5 to 15 knots becoming southwest. A
chance of showers and thunderstorms. Waves 1 to 2 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-172100-
MAFOR 1715/
ONTARIO WEST 1/2 12200 11300 12400 13500. A chance of showers
Wednesday morning. Waves 1 foot or less.

ONTARIO EAST 1/2 12300 11310 13410 11400 11500. A chance of
showers Wednesday morning. Waves 2 feet or less.

$$