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FZUS61 KBUF 170203
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
1003 PM EDT Wed Jul 16 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 track northeastward across the
Great Lakes and into Quebec tonight and Thursday, with its trailing
cold front pushing across the lake Thursday night. A 30.2 inch high
will then build from the western Great Lakes to New England Friday
through Saturday before drifting off the New England coast Saturday
night. A 29.8 inch low will then push east across the Great Lakes
Saturday night before reaching New England Sunday.

LOZ062-170900-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
1003 PM EDT Wed Jul 16 2025

.OVERNIGHT...South winds 10 to 15 knots. A chance of
showers. Waves 1 foot or less.
.THURSDAY...Southwest winds 10 to 15 knots becoming west and
increasing to 15 to 25 knots. A chance of showers early, then a
chance of showers and thunderstorms late in the morning. Waves
1 to 3 feet building to 3 to 6 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots becoming north.
Waves 4 to 7 feet subsiding to 2 to 4 feet. Waves occasionally
around 9 feet.
.FRIDAY...North winds 5 to 15 knots becoming southeast less than
10 knots. Waves 1 to 3 feet subsiding to 1 foot or less.
.FRIDAY NIGHT...Southeast winds 10 knots or less becoming south.
Waves 1 foot or less.
.SATURDAY...South winds 5 to 10 knots. A chance of showers. Waves
1 foot or less.
.SUNDAY...Northwest winds 5 to 10 knots becoming northeast. A
chance of showers during the day. Waves 1 to 2 feet.
.MONDAY...Northeast winds 5 to 10 knots becoming southeast. Waves
2 feet or less.

Winds and waves higher in and near thunderstorms.

$$

LOZ063>065-170900-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
1003 PM EDT Wed Jul 16 2025

.OVERNIGHT...South winds 5 to 15 knots. Showers likely with
a chance of thunderstorms. Waves 2 feet or less.
.THURSDAY...South winds 10 to 15 knots becoming west and
increasing to 15 to 25 knots. A chance of showers and
thunderstorms in the morning, then showers likely with a chance
of thunderstorms in the afternoon. Waves 1 to 2 feet building to
3 to 6 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots becoming north. Waves
5 to 8 feet subsiding to 3 to 6 feet. Waves occasionally around
10 feet.
.FRIDAY...North winds 15 to 20 knots becoming west and
diminishing to 10 knots or less in the afternoon. Waves 3 to
5 feet subsiding to 1 foot or less.
.FRIDAY NIGHT...Southwest winds 10 knots or less becoming south.
Waves 1 foot or less.
.SATURDAY...South winds 5 to 10 knots becoming southwest. A
chance of showers Saturday night. Waves 1 foot or less.
.SUNDAY...Northwest winds 5 to 10 knots becoming northeast. 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.

$$

LOZ061-170900-
MAFOR 1703/
ONTARIO WEST 1/2 11400 11410 12510 11520 12630 11730. A chance of
showers overnight and Thursday morning. Waves 1 foot or less
overnight. Waves 1 to 3 feet building to 3 to 6 feet Thursday.
Waves 4 to 7 feet, and occasionally around 9 feet Thursday
evening.

ONTARIO EAST 1/2 12400 11410 11510 11520 11530 12630. A chance of
showers overnight. A chance of showers and thunderstorms
Thursday. Waves 2 feet or less overnight. Waves 1 to 3 feet
building to 3 to 6 feet Thursday. Waves 5 to 8 feet, and
occasionally around 10 feet Thursday evening.

$$