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open lake forecast for lake ontario
national weather service buffalo ny
740 pm est tue jan 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 29.8 inch low will move from the upper great lakes 
wednesday to central quebec through thursday...then to the canadian 
maritimes friday. this low will push an arctic cold front across the 
lake thursday morning...followed by a reinforcing secondary front 
friday. at the same time...a large 31.0 inch high will build from 
northwestern canada to the northern plains states...with the high 
then weakening to 30.7 inches as it slides eastward across the great 
lakes and new england over the weekend.


loz063>065-210415-
lake ontario open waters from hamlin beach to the saint lawrence
river-
740 pm est tue jan 20 2026

...heavy freezing spray warning in effect until 1 am est
wednesday...

.tonight...west winds to 30 knots becoming southwest. heavy
freezing spray through the early overnight. a chance of lake
effect snow showers. waves 9 to 13 feet subsiding to 7 to
11 feet. waves occasionally around 16 feet. 
.wednesday...southwest winds to 30 knots becoming south. a chance
of snow showers early, then snow showers from late morning on.
waves 5 to 9 feet building to 7 to 10 feet. waves occasionally
around 13 feet. 
.wednesday night...southwest winds to 30 knots. snow showers.
waves 7 to 10 feet building to 9 to 13 feet. waves occasionally
around 16 feet. 
.thursday...west winds to 30 knots increasing to 40 knot gales.
lake effect snow. waves 10 to 15 feet. waves occasionally around
19 feet. 
.thursday night...west gales to 35 knots. lake effect snow. waves
11 to 15 feet. waves occasionally around 19 feet. 
.friday...west gales to 35 knots becoming northwest and
diminishing to 30 knots. lake effect snow during the day, then
lake effect snow showers likely friday night. waves 10 to 15 feet
subsiding to 7 to 10 feet. waves occasionally around 19 feet. 
.saturday...northwest winds 15 to 20 knots becoming east 10 to
15 knots. a chance of snow showers. waves 3 to 6 feet subsiding
to 2 to 4 feet. 
.sunday...east winds 10 to 15 knots becoming north. a chance of
snow showers. waves 2 to 4 feet building to 3 to 5 feet. 

$$