FZUS61 KBUF 191402

GLFLO 



Open Lake Forecast for Lake Ontario

National Weather Service Buffalo NY

1002 AM EDT Tue Aug 19 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 30.3 inch high will slowly move across Quebec, while 

ridging across the lower Great Lakes today. At the same time, a 29.9 

inch low will move into the lower Great Lakes through tonight. 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 Carolina coastline. A 30.1 inch high will 

then build across the Great Lakes region Thursday through Friday 

night. A 29.4 inch low will move near James Bay Saturday.



LOZ062-192100-

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

1002 AM EDT Tue Aug 19 2025



.THIS AFTERNOON...Southeast winds 10 to 15 knots becoming east. A

chance of showers. Waves 1 to 2 feet. 

.TONIGHT...East winds 15 to 20 knots becoming southeast. Showers

with a chance of thunderstorms through the early overnight, then

showers likely late. Waves 2 to 4 feet. 

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

20 knots. A chance of showers. Waves 2 to 4 feet building to 3 to

5 feet. 

.WEDNESDAY NIGHT...Northeast winds 15 to 20 knots. A chance of

showers in the evening. Waves 3 to 6 feet. 

.THURSDAY...Northeast winds 15 to 20 knots diminishing to 5 to

15 knots. Waves 3 to 5 feet subsiding to 1 to 3 feet. 

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

1 foot or less. 

.SATURDAY...Southwest winds 5 to 15 knots becoming west. A chance

of showers Saturday night. Waves 2 feet or less. 



Winds and waves higher in and near thunderstorms.



$$



LOZ063>065-192100-

Lake Ontario open waters from Hamlin Beach to the Saint Lawrence

River-

1002 AM EDT Tue Aug 19 2025



.THIS AFTERNOON...Southeast winds 5 to 15 knots becoming east. A

chance of showers late. Waves 2 feet or less. 

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

20 knots. A chance of showers early, then showers with a chance

of thunderstorms. Showers late. Waves 1 to 3 feet building to

2 to 4 feet. 

.WEDNESDAY...Southeast winds 15 to 20 knots becoming east.

Showers in the morning, then showers likely in the afternoon.

Waves 3 to 5 feet subsiding to 2 to 4 feet. 

.WEDNESDAY NIGHT...East winds 15 to 20 knots diminishing to 10 to

15 knots. A chance of showers in the evening. Waves 2 to 4 feet

building to 3 to 5 feet, then subsiding to 2 to 4 feet. 

.THURSDAY...Northeast winds 5 to 15 knots. Waves 2 to 4 feet

subsiding to 2 feet or less. 

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

1 foot or less. 

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

20 knots. Showers likely with a chance of thunderstorms Saturday

night. Waves 1 to 3 feet. 



Winds and waves higher in and near thunderstorms.



$$



LOZ061-192100-

MAFOR 1915/

ONTARIO WEST 1/2 11200 12210 11226 12326 11320 11220. Waves 1 to

2 feet this afternoon. Waves 2 to 4 feet tonight. Waves 3 to 5

feet subsiding to 2 to 4 feet Wednesday morning. 



ONTARIO EAST 1/2 11310 11200 11210 11220 13326 11320. Waves 2

feet or less this afternoon. Waves 1 to 3 feet building to 2 to 4

feet tonight. Waves 3 to 5 feet Wednesday morning. 



$$