FZUS61 KBUF 200811

GLFLO 



Open Lake Forecast for Lake Ontario

National Weather Service Buffalo NY

411 AM EDT Mon Apr 20 2026



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 settle southeast across the Great 

Lakes through tonight, before sliding off the mid-Atlantic coast 

Tuesday. A 29.4 inch low over lower Hudson Bay Tuesday, will weaken 

to 29.9 inches by Wednesday, while pushing an attendant weak cold 

front across the lake Tuesday night. A 30.2 inch high will then 

build across the Great Lakes region Wednesday and Thursday. A warm 

front will then approach the lake by Friday. A 29.6 inch low may 

move southwest of the Lake on Saturday.



LOZ062-201500-

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

411 AM EDT Mon Apr 20 2026



.TODAY...Northwest winds 15 to 20 knots becoming west 10 to

15 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet. 

.TONIGHT...West winds 5 to 15 knots becoming south 10 knots or

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

.TUESDAY...South winds 10 to 15 knots becoming southeast. Waves

1 to 2 feet. 

.TUESDAY NIGHT...Southeast winds 5 to 10 knots becoming

northeast. Waves 2 feet or less. 

.WEDNESDAY...Northeast winds less than 10 knots becoming north.

Waves 1 foot or less. 

.THURSDAY...Northeast winds 10 knots or less becoming east. Waves

1 foot or less. 

.FRIDAY...East winds 10 to 15 knots increasing to 15 to 20 knots.

A chance of showers Friday night. Waves 1 to 3 feet building to

2 to 4 feet. 



$$



LOZ063>065-201500-

Lake Ontario open waters from Hamlin Beach to the Saint Lawrence

River-

411 AM EDT Mon Apr 20 2026



.TODAY...Northwest winds 15 to 20 knots becoming west. Waves 3 to

5 feet subsiding to 2 to 4 feet. 

.TONIGHT...West winds 15 to 20 knots becoming southwest 5 to

15 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet. 

.TUESDAY...Southwest winds 5 to 15 knots becoming southeast.

Waves 1 to 2 feet. 

.TUESDAY NIGHT...Southeast winds 5 to 15 knots. Waves 2 feet or

less. 

.WEDNESDAY...Northeast winds 10 knots or less becoming north.

Waves 1 foot or less. 

.THURSDAY...Northwest winds 10 knots or less becoming northeast.

Waves 1 foot or less. 

.FRIDAY...Northeast winds 5 to 15 knots becoming east. A chance

of showers Friday night. Waves 1 to 3 feet. 



$$



LOZ061-201500-

MAFOR 2009/

ONTARIO WEST 1/2 11720 12710 13610 11600 11500. Waves 3 to 5 feet

subsiding to 1 to 3 feet today. Waves 1 to 3 feet subsiding to 1

foot or less tonight. 



ONTARIO EAST 1/2 11720 12710 11610 11620 12610 11600. Waves 3 to

5 feet subsiding to 1 to 3 feet, then building to 2 to 4 feet

today. Waves 2 to 4 feet subsiding to 1 to 3 feet tonight. 



$$