380
FZUS61 KBUF 172002
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
402 PM 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...
A 29.4 inch low pressure passing to our north will encourage a warm
front to lift towards the Lake while deepening to 29.2 inches as it
advances across Quebec tonight. Another wave of low pressure
averaging 29.5 is then forecast to track northeast towards the
central Great Lakes along this frontal boundary on Wednesday. This
low is forecast to drag its cold front across the Lake Thursday. A
30.1 inch high builds northeast across the Lake Friday, and exits
east of the Lake on Saturday.

LOZ062-180300-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
402 PM EDT Tue Jun 17 2025

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

Winds and waves higher in and near thunderstorms.

$$

LOZ063>065-180300-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
402 PM EDT Tue Jun 17 2025

.TONIGHT...Southeast winds 10 to 15 knots becoming south. Waves
2 feet or less.
.WEDNESDAY...South winds 10 knots or less becoming southwest. 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 overnight. Waves 2 feet or less.
.THURSDAY...South winds 15 to 20 knots becoming west. Showers
likely with a chance of thunderstorms in the morning, then
showers likely in the afternoon. Waves 1 to 3 feet building to
3 to 6 feet.
.THURSDAY NIGHT...West winds 15 to 20 knots diminishing to 10 to
15 knots. A chance of showers in the evening. Waves 3 to 6 feet
subsiding to 2 to 4 feet.
.FRIDAY...West winds 5 to 10 knots becoming southwest. Waves 1 to
3 feet.
.SATURDAY...South winds 5 to 15 knots becoming southwest. A
chance of showers during the day, then a chance of showers and
thunderstorms Saturday night. Waves 1 to 3 feet.
.SUNDAY...Southwest winds 5 to 15 knots. A chance of showers
during the day. Waves 1 to 3 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-180300-
MAFOR 1721/
ONTARIO WEST 1/2 11200 12400 13500 11600 11500. Waves 1 foot or
less.

ONTARIO EAST 1/2 11300 13410 11400 12500 11600. Waves 2 feet or
less.

$$