339
FZUS61 KBUF 171402
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
1002 AM EDT Thu Jul 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 29.7 inch low will make its way from Lake Huron to
Quebec today, pushing a cold front across the lake, followed by a
secondary cold front this evening. A 30.2 inch high will build from
the western Great Lakes to New England Friday and Friday night,
before drifting off the New England coast Saturday. A 29.8 inch low
will push east across the Great Lakes Saturday night before reaching
New England Sunday, with a 30.1 inch high building across the Great
Lakes on Monday.

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

.REST OF TODAY...Southwest winds to 30 knots becoming west. A
chance of showers and thunderstorms. Waves 3 to 6 feet building
to 6 to 10 feet. Waves occasionally around 13 feet.
.TONIGHT...Northwest winds to 30 knots becoming north and
diminishing to 10 to 15 knots after midnight. Waves 7 to 10 feet
subsiding to 2 to 4 feet. Waves occasionally around 13 feet.
.FRIDAY...Northeast winds 10 knots or less becoming southeast.
Waves 2 feet or less.
.FRIDAY NIGHT...South winds 5 to 10 knots. Waves 1 foot or less.
.SATURDAY...South winds 5 to 10 knots becoming northwest. A
chance of showers during the day, then a chance of showers and
thunderstorms Saturday night. Waves 2 feet or less.
.SUNDAY...Northwest winds 10 to 15 knots becoming northeast.
Waves 1 to 2 feet.
.MONDAY...Northeast winds 5 to 10 knots becoming southeast. 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 Thu Jul 17 2025

.REST OF TODAY...Southwest winds 15 to 20 knots becoming west and
increasing to 30 knots. A chance of showers and thunderstorms
late this morning, then showers likely with a chance of
thunderstorms early this afternoon. A chance of showers and
thunderstorms late. Some thunderstorms may produce gusty winds
early this afternoon. Waves 2 to 4 feet building to 8 to 11 feet.
Waves occasionally around 14 feet.
.TONIGHT...West winds to 30 knots becoming north 15 to 25 knots.
Waves 8 to 12 feet subsiding to 3 to 5 feet. Waves occasionally
around 15 feet.
.FRIDAY...North winds 5 to 15 knots becoming west. Waves 2 to
4 feet subsiding to 1 foot or less.
.FRIDAY NIGHT...Southwest winds 5 to 10 knots becoming south.
Waves 1 foot or less.
.SATURDAY...South winds 5 to 15 knots becoming northwest. A
chance of showers during the day, then a chance of showers and
thunderstorms Saturday night. Waves 2 feet or less.
.SUNDAY...Northwest winds 10 to 15 knots becoming north. A chance
of showers during the day. Waves 2 feet or less.
.MONDAY...Northeast winds 5 to 10 knots becoming southeast. Waves
2 feet or less.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-172100-
MAFOR 1715/
ONTARIO WEST 1/2 11540 12640 11730 11720 12810 11100. A chance of
showers and thunderstorms late this morning. Waves 3 to 6 feet
building to 8 to 11 feet, and occasionally around 14 feet this
afternoon. Waves 8 to 11 feet subsiding to 2 to 4 feet, and
occasionally around 14 feet tonight. Waves 1 to 3 feet Friday
morning.

ONTARIO EAST 1/2 11536 12640 11730 11720 11820 12810. A chance of
thunderstorms this afternoon. Waves 1 to 3 feet building to 8 to
11 feet, and occasionally around 14 feet this afternoon. Waves 8
to 12 feet subsiding to 3 to 5 feet, and occasionally around 15
feet tonight. Waves 2 to 4 feet subsiding to 1 to 3 feet Friday
morning.

$$