117
FZUS61 KBUF 170801
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
401 AM EDT Sat May 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 29.0 inch low over the western Great Lakes will weaken
to 29.3 inches this morning as it lifts to areas north of the Great
Lakes. This low will then cross southern Ontario Canada and enter
into central Quebec Sunday. The lake will then be on the southern
periphery of a large 30.6 inch ridge centered over the Hudson Bay on
Monday. A 29.5 inch low will track from the central Plains Tuesday
to the Ohio Valley by Wednesday.

LOZ062-171500-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
401 AM EDT Sat May 17 2025

.TODAY...South winds 10 to 15 knots becoming southwest 15 to
20 knots. A chance of showers early. Showers likely with a chance
of thunderstorms early this afternoon, then a chance of showers
and thunderstorms late. Waves 1 to 3 feet building to 3 to
5 feet.
.TONIGHT...West winds 15 to 20 knots. A chance of showers and
thunderstorms early, then a chance of showers. Waves 4 to 7 feet.
Waves occasionally around 9 feet.
.SUNDAY...West winds 15 to 20 knots. Waves 3 to 6 feet.
.SUNDAY NIGHT...West winds 15 to 20 knots becoming northwest
10 to 15 knots. Waves 3 to 5 feet subsiding to 2 to 4 feet.
.MONDAY...Northwest winds 10 to 15 knots becoming north. Waves
1 to 3 feet.
.TUESDAY...North winds 5 to 15 knots becoming northeast. Waves
2 feet or less.
.WEDNESDAY...Northeast winds 15 to 20 knots. Showers likely.
Waves 2 to 4 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ063>065-171500-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
401 AM EDT Sat May 17 2025

.TODAY...South winds 5 to 10 knots becoming southwest and
increasing to 15 to 20 knots. A chance of showers this morning,
then showers with thunderstorms likely this afternoon. Some
thunderstorms may produce gusty winds this afternoon. Waves 1 to
3 feet building to 3 to 5 feet.
.TONIGHT...West winds 15 to 25 knots becoming southwest. A chance
of showers and thunderstorms early, then a chance of showers from
late evening on. Waves 3 to 6 feet building to 4 to 7 feet. Waves
occasionally around 9 feet.
.SUNDAY...West winds 15 to 20 knots. A chance of showers. Waves
3 to 6 feet building to 4 to 7 feet. Waves occasionally around
9 feet.
.SUNDAY NIGHT...West winds 15 to 20 knots becoming northwest. A
chance of showers in the evening. Waves 3 to 6 feet subsiding to
2 to 4 feet.
.MONDAY...Northwest winds 15 to 20 knots becoming north 10 to
15 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.TUESDAY...North winds 5 to 15 knots becoming northeast. Waves
2 feet or less.
.WEDNESDAY...Northeast winds 10 to 15 knots becoming east.
Showers likely. Waves 1 to 3 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-171500-
MAFOR 1709/
ONTARIO WEST 1/2 11410 11510 12520 11620 13520. A chance of
showers today and this evening. Waves 1 to 3 feet building to 3
to 5 feet today. Waves 4 to 7 feet, and occasionally around 9
feet tonight.

ONTARIO EAST 1/2 11300 11400 11510 11529 11620 12530 11520. Waves
2 feet or less building to 3 to 5 feet today. Waves 3 to 6 feet
building to 4 to 7 feet, and occasionally around 9 feet tonight.

$$