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open lake forecast for lake ontario
national weather service buffalo ny
1009 pm edt wed mar 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 30.4 inch high ridged from the lower ohio valley 
to the lake will slide east to the east coast by this evening. 
following the passage of a weak warm front, a 30.2 inch high will 
build across the great lakes region thursday and thursday evening. a 
29.8 inch low will settle from the upper great lakes to the lower 
lakes friday, with another 29.6 inch low then moving from near james 
bay to the canadian maritimes between saturday and sunday and 
pushing a cold front across the lake. a 30.4 inch high is then 
forecast to build across the great lakes on monday.


loz063>065-190900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1009 pm edt wed mar 18 2026

.rest of tonight...south winds 15 to 20 knots. scattered flurries
after midnight. waves 1 to 3 feet building to 2 to 4 feet. 
.thursday...south winds 15 to 20 knots becoming southwest 10 to
15 knots. a chance of snow showers in the morning, then a chance
of rain and snow showers early in the afternoon. waves 3 to
5 feet subsiding to 1 to 3 feet. 
.thursday night...west winds 10 knots or less. waves 2 feet or
less. 
.friday...south winds 10 knots or less becoming southeast. a
chance of rain and snow showers in the morning, then rain showers
likely in the afternoon. waves 1 foot or less. 
.friday night...east winds 10 to 15 knots becoming northwest.
rain showers likely in the evening, then a chance of rain showers
overnight. waves 2 feet or less. 
.saturday...west winds 10 to 15 knots becoming southwest 15 to
20 knots. a chance of rain showers during the day, then a chance
of rain and snow showers saturday night. waves 1 to 3 feet
building to 3 to 5 feet. 
.sunday...northwest winds 15 to 25 knots becoming north to
30 knots. a chance of rain and snow showers. waves 3 to 6 feet
building to 5 to 8 feet. waves occasionally around 10 feet. 
.monday...north winds 15 to 25 knots becoming northeast. waves
5 to 8 feet subsiding to 1 to 3 feet. waves occasionally around
10 feet. 

$$