FZUS61 KBUF 190202

GLFLO 



Open Lake Forecast for Lake Ontario

National Weather Service Buffalo NY

1002 PM EDT Mon Aug 18 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 30.4 inch high will slowly move east across central 

Quebec tonight, while remaining ridged south/southwestward across 

the Lower Great Lakes. At the same time, a 29.9 inch low will move 

into the Central Great Lakes tonight, then will weaken and stall out 

across the Lower Lakes Tuesday and Tuesday night. A lingering 

surface trough will remain near the Lake Wednesday, while Hurricane 

Erin curves north/northeastward, with center of the storm remaining 

well off the Southeast and Carolina coastline. A 30.1 inch high will 

then build across the Great Lakes region Thursday through Friday 

night.



LOZ062-190900-

Lake Ontario open waters from the Niagara River to Hamlin Beach-

1002 PM EDT Mon Aug 18 2025



.OVERNIGHT...East winds 10 to 15 knots becoming southeast.

Waves 1 to 3 feet. 

.TUESDAY...Southeast winds 5 to 15 knots becoming east. A chance

of showers late. Waves 1 to 2 feet. 

.TUESDAY NIGHT...East winds 15 to 20 knots becoming south 10 to

15 knots. Showers likely. Waves around 1 foot. 

.WEDNESDAY...Southeast winds 5 to 10 knots becoming northeast. A

chance of showers. Waves 1 foot or less. 

.WEDNESDAY NIGHT...East winds 15 to 20 knots becoming northeast

10 to 15 knots. A chance of showers in the evening. Waves 1 to

3 feet. 

.THURSDAY...Northeast winds 5 to 15 knots becoming east. Waves

1 to 3 feet. 

.FRIDAY...East winds 5 to 10 knots becoming south. Waves around

1 foot. 

.SATURDAY...Southwest winds 10 to 15 knots becoming west. A

chance of showers. Waves 1 to 2 feet. 



$$



LOZ063>065-190900-

Lake Ontario open waters from Hamlin Beach to the Saint Lawrence

River-

1002 PM EDT Mon Aug 18 2025



.OVERNIGHT...Northeast winds 15 to 20 knots becoming

southeast. Waves 2 feet or less. 

.TUESDAY...Southeast winds 5 to 15 knots becoming east. Waves

2 feet or less. 

.TUESDAY NIGHT...East winds 15 to 20 knots becoming south 10 to

15 knots. Showers likely. Waves 1 to 3 feet. 

.WEDNESDAY...South winds 5 to 15 knots becoming east. Showers

likely in the morning, then a chance of showers in the afternoon.

Waves 1 to 3 feet subsiding to 1 foot or less. 

.WEDNESDAY NIGHT...East winds 10 to 15 knots becoming northeast.

A chance of showers in the evening. Waves 1 to 3 feet. 

.THURSDAY...Northeast winds 5 to 15 knots. Waves 1 to 3 feet. 

.FRIDAY...Northeast winds 10 knots or less becoming south. Waves

1 foot or less. 

.SATURDAY...South winds 5 to 15 knots becoming southwest. A

chance of showers and thunderstorms during the day, then showers

likely with a chance of thunderstorms Saturday night. Waves 1 to

3 feet. 



Winds and waves higher in and near thunderstorms.



$$



LOZ061-190900-

MAFOR 1903/

ONTARIO WEST 1/2 12210 11310 11300 11200 11210 11220 11226. Waves

1 to 3 feet. 



ONTARIO EAST 1/2 11210 13310 11300 12210 11310. A chance of

showers Tuesday evening. Waves 2 feet or less. 



$$