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open lake forecast for lake ontario
national weather service buffalo ny
403 pm edt wed mar 11 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...low pressure will deepen to 29.2 inches as it moves from 
lake huron this evening to southern quebec overnight before reaching 
the canadian maritimes thursday evening. a ridge of high pressure 
averaging 30.1 inches will then build into the ohio valley and lower 
great lakes thursday afternoon and evening before drifting to the 
eastern seaboard friday. a 29.0 inch low will then move from the 
upper great lakes friday morning to the ottawa valley friday night 
while weakening to 29.4 inches. this low will continue east to the 
canadian maritimes saturday as a 30.3 inch high builds into the 
lower great lakes. a 30.3 inch surface high will ridge across the 
lake saturday night, and move east of the lake sunday. meanwhile, a 
29.5 inch surface low over the mid mississippi valley sunday morning 
will track northeastward and deepen to 28.9 inches just to the west 
of the lake monday morning.


loz063>065-120300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 pm edt wed mar 11 2026

...gale warning in effect from 11 pm edt this evening through
thursday morning...

.tonight...southwest winds 15 to 25 knots becoming west and
increasing to 35 knot gales after midnight. rain showers with a
chance of thunderstorms early, then rain showers. a chance of
rain and snow showers late. waves 3 to 6 feet building to 12 to
16 feet. waves occasionally around 20 feet. 
.thursday...west winds to 30 knots. a chance of snow showers in
the morning. waves 10 to 15 feet subsiding to 7 to 11 feet. waves
occasionally around 19 feet. 
.thursday night...northwest winds to 30 knots becoming west and
diminishing to around 10 knots overnight. waves 6 to 10 feet
subsiding to 2 to 4 feet. waves occasionally around 13 feet. 
.friday...south winds 10 to 15 knots becoming southwest and
increasing to 30 knots in the afternoon. rain and snow. waves
1 to 3 feet building to 4 to 7 feet. waves occasionally around
9 feet. 
.friday night...southwest winds 20 to 25 knots becoming west and
increasing to 40 knot gales overnight. rain with a chance of snow
showers in the evening, then a chance of snow showers overnight.
waves 5 to 8 feet building to 14 to 18 feet. waves occasionally
around 23 feet. 
.saturday...west gales to 40 knots becoming north and diminishing
to 10 to 15 knots. waves 14 to 18 feet subsiding to 2 to 4 feet.
waves occasionally around 23 feet. 
.sunday...east winds 15 to 20 knots becoming southeast and
increasing to 40 knot gales. snow showers likely during the day,
then rain and snow showers likely sunday night. waves 1 to 3 feet
building to 8 to 11 feet. waves occasionally around 14 feet. 
.monday...south gales to 40 knots becoming west to 35 knots. rain
and snow showers during the day, then a chance of snow and rain
showers monday night. waves 7 to 10 feet building to 12 to
17 feet. waves occasionally around 22 feet. 

winds and waves higher in and near thunderstorms.

$$