783
FZUS61 KBUF 040802
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
402 AM EDT Thu Sep 4 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 29.3 inch low will stall over northwest Ontario
province through Friday, with its trailing cold front crossing the
lower Great Lakes this afternoon. Another 29.3 inch low will cross
the central Great Lakes Friday, pushing a secondary cold front east
across the lake Friday night. The two low pressure systems will then
merge over northern Quebec Saturday before moving into the North
Atlantic Sunday. An expansive 30.3 inch high will then build into
the Great Lakes and Ohio Valley Monday.

LOZ062-041500-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
402 AM EDT Thu Sep 4 2025

.TODAY...South winds 10 to 15 knots becoming west 15 to 20 knots.
A chance of showers and thunderstorms early, then showers with a
chance of thunderstorms. A chance of showers late. Waves 1 to
3 feet.
.TONIGHT...West winds 5 to 15 knots becoming southwest. Waves
1 to 3 feet.
.FRIDAY...South winds 10 to 15 knots becoming southwest and
increasing to 30 knots in the afternoon. Waves 1 to 3 feet
building to 4 to 7 feet. Waves occasionally around 9 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots becoming west and
diminishing to 10 to 15 knots. A chance of showers. Waves 4 to
7 feet subsiding to 2 to 4 feet. Waves occasionally around
9 feet.
.SATURDAY...West winds 10 to 15 knots. A chance of showers during
the day. Waves 2 to 4 feet.
.SUNDAY...West winds around 10 knots becoming northwest. Waves
1 to 3 feet.
.MONDAY...Northwest winds 5 to 10 knots becoming southwest. Waves
2 feet or less.

Winds and waves higher in and near thunderstorms.

$$

LOZ063>065-041500-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
402 AM EDT Thu Sep 4 2025

.TODAY...South winds 15 to 25 knots becoming west. A chance of
showers this morning, then showers with a chance of thunderstorms
this afternoon. Waves 3 to 6 feet.
.TONIGHT...West winds 5 to 15 knots becoming southwest. A chance
of showers early. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.FRIDAY...South winds 10 to 15 knots becoming southwest 15 to
20 knots. Waves 1 to 3 feet.
.FRIDAY NIGHT...Southwest winds 15 to 20 knots becoming west
10 to 15 knots. A chance of showers in the evening, then showers
likely overnight. Waves 2 to 4 feet.
.SATURDAY...West winds 10 to 15 knots. Showers likely during the
day. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.SUNDAY...West winds 10 to 15 knots. A chance of showers Sunday
night. Waves 1 to 3 feet.
.MONDAY...Northwest winds 5 to 10 knots becoming southwest. Waves
2 feet or less.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-041500-
MAFOR 0409/
ONTARIO WEST 1/2 11410 11516 11626 11620 12610 11600 11500. A
chance of thunderstorms today. Waves 1 to 3 feet building to 2 to
4 feet today. Waves 1 to 3 feet tonight.

ONTARIO EAST 1/2 11430 11420 11426 11526 12610 11600 11500. A
chance of thunderstorms this afternoon. Waves 3 to 6 feet today.
Waves 2 to 4 feet subsiding to 1 to 3 feet tonight.

$$