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open lake forecast for lake ontario
national weather service buffalo ny
403 am edt fri mar 13 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 29.0 inch low will move from the upper great lakes 
this morning to the ottawa valley tonight while weakening to 29.5 
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 high will then ridge across the lake saturday night, 
before moving 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, before pushing northeastward across quebec 
through the remainder of monday and tuesday. this low will sweep a 
strong cold front across the lake monday afternoon, with a 30.3 inch 
high then building across the great lakes and ohio valley tuesday.


loz063>065-131500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 am edt fri mar 13 2026

...gale warning in effect from this afternoon through saturday
afternoon...

.today...south winds 10 to 15 knots becoming southeast and
increasing to 30 knots this afternoon. a chance of snow showers
late this morning. snow showers early this afternoon, then snow
and rain showers late. waves 1 to 3 feet building to 5 to 8 feet.
waves occasionally around 10 feet. 
.tonight...southwest gales to 35 knots becoming west. rain and
snow showers. waves 7 to 10 feet building to 12 to 16 feet. waves
occasionally around 20 feet. 
.saturday...west gales to 40 knots diminishing to 30 knots. snow
showers with rain showers likely in the morning, then a chance of
snow showers in the afternoon. waves 14 to 19 feet subsiding to
10 to 15 feet. waves occasionally around 24 feet. 
.saturday night...west winds 15 to 25 knots becoming east and
diminishing to 5 to 15 knots. waves 7 to 10 feet subsiding to
2 feet or less. waves occasionally around 13 feet. 
.sunday...east winds 15 to 25 knots becoming southeast and
increasing to 40 knot gales. snow showers likely with a chance of
rain showers during the day, then a chance of rain showers sunday
night. waves 2 to 4 feet building to 9 to 12 feet. waves
occasionally around 15 feet. 
.monday...southeast gales to 40 knots becoming southwest. rain
showers during the day, then rain showers with snow showers
likely monday night. waves 7 to 11 feet building to 14 to
18 feet. waves occasionally around 23 feet. 
.tuesday...west gales to 40 knots diminishing to 30 knots. a
chance of snow showers during the day. waves 13 to 18 feet
subsiding to 10 to 14 feet. waves occasionally around 23 feet. 

$$