FZUS61 KBUF 191410
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
1010 AM EDT Sun Apr 19 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...Elongated low pressure draped from eastern Canada to the
southern New England coastline and averaging 29.7 inches will slide
further eastward this afternoon...with a trailing secondary cold
front crossing the lake this evening. Behind this front, a 30.4 inch
high will settle southeast across the Great Lakes 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.

LOZ062-192100-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
1010 AM EDT Sun Apr 19 2026

.THIS AFTERNOON...West winds 10 to 15 knots. A chance of rain
showers late. Waves 2 to 4 feet.
.TONIGHT...West winds 10 to 15 knots becoming northwest 15 to
20 knots. A chance of rain and snow showers early, then a chance
of rain showers late 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
10 knots or less. Waves 1 to 3 feet subsiding to 1 foot or less.
.TUESDAY...South winds 5 to 15 knots becoming northeast. Waves
1 to 3 feet.
.WEDNESDAY...Northeast winds 10 knots or less becoming northwest.
Waves 1 foot or less.
.THURSDAY...West winds 10 knots or less becoming east. Waves
1 foot or less.

$$

LOZ063>065-192100-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
1010 AM EDT Sun Apr 19 2026

.THIS AFTERNOON...West winds 10 to 15 knots increasing to 15 to
20 knots. Waves 1 to 3 feet building to 3 to 5 feet.
.TONIGHT...West winds 15 to 20 knots becoming northwest. A chance
of rain and snow showers in the evening. 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 5 to 15 knots becoming southeast. Waves
1 to 2 feet.
.WEDNESDAY...Northeast winds 10 knots or less becoming northwest.
Waves 1 to 3 feet subsiding to 1 foot or less.
.THURSDAY...Northwest winds 10 knots or less becoming east. Waves
1 foot or less.

$$

LOZ061-192100-
MAFOR 1915/
ONTARIO WEST 1/2 13610 11710 13720 11710. A chance of rain and
snow showers this evening. Waves 2 to 4 feet this afternoon.
Waves 3 to 5 feet tonight. Waves 3 to 5 feet subsiding to 2 to 4
feet Monday morning.

ONTARIO EAST 1/2 11610 12620 11610 13720 11810. Waves 1 to 3 feet
building to 3 to 5 feet this afternoon. Waves 3 to 6 feet
tonight. Waves 3 to 5 feet subsiding to 2 to 4 feet Monday
morning.

$$