119
FZUS61 KBUF 170803
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
402 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, and will push an initial cold front across the lake
today, followed by a secondary cold front this evening. A 30.2 inch
high will then 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 then forecast to build across the Great Lakes on Monday.

LOZ062-171500-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
402 AM EDT Thu Jul 17 2025

.TODAY...Southwest winds 15 to 25 knots becoming west to
30 knots. A chance of showers and thunderstorms through early
afternoon. Waves 1 to 3 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>065-171500-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
402 AM EDT Thu Jul 17 2025

.TODAY...South winds 10 to 15 knots becoming west and increasing
to 30 knots this afternoon. A chance of showers and thunderstorms
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 1 to 3 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.

$$

LOZ061-171500-
MAFOR 1709/
ONTARIO WEST 1/2 11510 11530 11540 12640 11730 11720 11810. A
chance of showers early, then a chance of showers and
thunderstorms this morning. Waves 1 to 3 feet building to 8 to 11
feet, and occasionally around 14 feet today. Waves 8 to 11 feet
subsiding to 2 to 4 feet, and occasionally around 14 feet
tonight.

ONTARIO EAST 1/2 11410 11510 11536 12640 11730 11720 11820. A
chance of thunderstorms today. Waves 1 to 3 feet building to 8 to
11 feet, and occasionally around 14 feet today. Waves 8 to 12
feet subsiding to 3 to 5 feet, and occasionally around 15 feet
tonight.

$$