FZUS61 KBUF 191401
GLFLO 

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
1001 AM EDT Mon May 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 29.4 inch low will slowly drift southeast of the 
Canadian Maritimes through tonight. Meanwhile, the lake will be on 
the southern periphery of a large 30.6 inch ridge centered over the 
Hudson Bay today. A 29.5 inch low will track from the Central Plains 
Tuesday to the Ohio Valley by Wednesday. The low will stall across 
the central Appalachians before transitioning to the east coast 
Thursday. The 29.5 inch low will move north along the east coast 
through Friday.

LOZ062-192100-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
1001 AM EDT Mon May 19 2025

.THIS AFTERNOON...Northwest winds 15 to 20 knots becoming west
10 to 15 knots. Waves 1 to 2 feet. 
.TONIGHT...Northwest winds 10 to 15 knots becoming north. Waves
1 to 2 feet. 
.TUESDAY...North winds 10 knots or less becoming southeast. Waves
2 feet or less. 
.TUESDAY NIGHT...East winds 5 to 15 knots increasing to 15 to
20 knots. Waves 2 feet or less building to 2 to 3 feet. 
.WEDNESDAY...East winds 15 to 25 knots. Showers. Waves 3 to
5 feet building to 4 to 7 feet. Waves occasionally around 9 feet.
.THURSDAY...East winds 15 to 20 knots diminishing to 5 to
15 knots. Showers. Waves 3 to 5 feet subsiding to 1 to 2 feet. 
.FRIDAY...West winds 5 to 15 knots becoming northwest. Showers
likely. Waves 1 to 2 feet. 

$$

LOZ063>065-192100-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
1001 AM EDT Mon May 19 2025

.THIS AFTERNOON...Northwest winds 10 to 15 knots becoming west.
Waves 1 to 3 feet. 
.TONIGHT...West winds 10 to 15 knots becoming north. Waves 1 to
3 feet. 
.TUESDAY...North winds 5 to 15 knots becoming west. Waves 1 to
3 feet subsiding to 1 foot or less. 
.TUESDAY NIGHT...Northeast winds 5 to 15 knots. Waves 2 feet or
less. 
.WEDNESDAY...East winds 15 to 20 knots. Showers. Waves 1 to
3 feet building to 3 to 5 feet. 
.THURSDAY...East winds 15 to 20 knots diminishing to 5 to
15 knots. Showers. Waves 2 to 4 feet subsiding to 1 to 3 feet. 
.FRIDAY...Northeast winds 5 to 10 knots becoming northwest.
Showers likely. Waves 2 feet or less. 

$$

LOZ061-192100-
MAFOR 1915/
ONTARIO WEST 1/2 11700 12610 11710 11810 11800 11810 11800. Waves
1 to 2 feet. 

ONTARIO EAST 1/2 11710 12610 11710 11800 13810. Waves 1 to 3
feet. 

$$