800
FZUS61 KBUF 050202
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
1002 PM 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. 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.

LOZ062-050900-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
1002 PM EDT Thu Sep 4 2025

.REST OF TONIGHT...West winds 10 to 15 knots becoming south. A
chance of showers late this evening. Waves 1 to 2 feet.
.FRIDAY...South winds 15 to 20 knots becoming southwest and
increasing to 30 knots. Waves 1 to 3 feet building to 5 to
8 feet. Waves occasionally around 10 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots becoming west and
diminishing to 10 to 15 knots. A chance of showers overnight.
Waves 5 to 8 feet subsiding to 2 to 4 feet. Waves occasionally
around 10 feet.
.SATURDAY...West winds 10 to 15 knots. A chance of showers in the
morning. Waves 2 to 3 feet.
.SATURDAY NIGHT...West winds 10 to 15 knots. Waves 1 to 3 feet.
.SUNDAY...West winds 10 to 15 knots. A chance of showers. Waves
1 to 3 feet.
.MONDAY...West winds 5 to 10 knots. Waves 2 feet or less.
.TUESDAY...South winds 5 to 10 knots. Waves 1 foot or less.

$$

LOZ063>065-050900-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
1002 PM EDT Thu Sep 4 2025

.REST OF TONIGHT...Southwest winds 5 to 10 knots becoming south.
Waves 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 3 to 6 feet subsiding to 2 to 4 feet.
.SATURDAY...West winds 10 to 15 knots. Showers likely in the
morning, then a chance of showers in the afternoon. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.SATURDAY NIGHT...West winds 10 to 15 knots. A chance of showers.
Waves 1 to 3 feet.
.SUNDAY...West winds 10 to 15 knots. A chance of showers. Waves
1 to 3 feet.
.MONDAY...West winds 5 to 15 knots becoming northwest. Waves 1 to
3 feet.
.TUESDAY...South winds 10 knots or less. Waves 1 foot or less.

$$

LOZ061-050900-
MAFOR 0503/
ONTARIO WEST 1/2 11500 12410 11420 11430 13530. Waves 1 to 2 feet
overnight. Waves 1 to 3 feet building to 5 to 8 feet, and
occasionally around 10 feet Friday. Waves 5 to 8 feet, and
occasionally around 10 feet Friday evening.

ONTARIO EAST 1/2 12500 14410 12520. A chance of showers Friday
evening. Waves 1 to 3 feet overnight and Friday. Waves 3 to 5
feet Friday evening.

$$