FZUS61 KBUF 182009

GLFLO 



Open Lake Forecast for Lake Ontario

National Weather Service Buffalo NY

409 PM EDT Sat Apr 18 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 29.5 inch low east of Lake Superior this afternoon 

will move to James Bay and deepen to 29.0 inches, while pushing a 

trailing strong cold front across the lake this afternoon and 

evening. A 30.4 inch high will then settle southeast across the 

Great Lakes Sunday through Monday night, 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.



LOZ062-190300-

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

409 PM EDT Sat Apr 18 2026



.TONIGHT...West winds 15 to 20 knots becoming northwest 10 to

15 knots. Rain showers early, then a chance of rain showers. A

chance of rain and snow showers late. Waves 2 to 3 feet. 

.SUNDAY...West winds 10 to 15 knots increasing to 15 to 20 knots.

A chance of rain showers late. Waves 2 to 4 feet. 

.SUNDAY NIGHT...West winds 15 to 20 knots becoming northwest. A

chance of rain showers in the evening. Waves 2 to 4 feet. 

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

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

.MONDAY NIGHT...Northwest winds 5 to 15 knots becoming southwest.

Waves 1 to 3 feet. 

.TUESDAY...South winds 15 to 20 knots becoming west 10 to

15 knots. Waves 1 to 3 feet. 

.WEDNESDAY...North winds 10 knots or less. Waves 1 foot or less. 

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

1 foot or less. 



$$



LOZ063>065-190300-

Lake Ontario open waters from Hamlin Beach to the Saint Lawrence

River-

409 PM EDT Sat Apr 18 2026



.TONIGHT...Southwest winds 15 to 20 knots becoming northwest

10 to 15 knots. Rain showers this evening, then rain showers

likely after midnight. Rain showers late. Waves 3 to 5 feet

subsiding to 2 to 4 feet. 

.SUNDAY...West winds 10 to 15 knots increasing to 15 to 20 knots.

Rain and snow showers likely early. Waves 2 to 4 feet building to

3 to 5 feet. 

.SUNDAY NIGHT...West winds 15 to 20 knots. Waves 3 to 6 feet. 

.MONDAY...Northwest winds 15 to 20 knots becoming west. Waves

3 to 5 feet subsiding to 2 to 4 feet. 

.MONDAY NIGHT...West winds 15 to 20 knots diminishing to 5 to

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

.TUESDAY...South winds 10 to 15 knots. Waves 1 to 2 feet. 

.WEDNESDAY...North winds 5 to 15 knots becoming northwest. Waves

2 feet or less. 

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

1 foot or less. 



$$



LOZ061-190300-

MAFOR 1821/

ONTARIO WEST 1/2 11626 11616 11720 11710 14610. Waves 2 to 4

feet. 



ONTARIO EAST 1/2 11426 11626 11620 12716 12610 11620. A chance of

snow showers Sunday morning. Waves 3 to 5 feet subsiding to 2 to

4 feet tonight. Waves 2 to 4 feet building to 3 to 5 feet Sunday.



$$