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open lake forecast for lake ontario
national weather service buffalo ny
1004 am edt thu mar 12 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 ridge of high pressure averaging 30.1 inches will 
build into the ohio valley and lower great lakes this 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>065-122100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1004 am edt thu mar 12 2026

...gale watch in effect from friday evening through saturday
afternoon...

.rest of today...west winds to 30 knots. scattered snow showers
late this morning. waves 8 to 12 feet. waves occasionally around
15 feet. 
.tonight...northwest winds to 30 knots becoming west and
diminishing to 5 to 15 knots after midnight. waves 7 to 10 feet
subsiding to 2 to 4 feet. waves occasionally around 13 feet. 
.friday...south winds 15 to 25 knots becoming southwest to
30 knots. snow showers in the morning, then rain and snow showers
in the afternoon. waves 2 feet or less building to 5 to 8 feet.
waves occasionally around 10 feet. 
.friday night...southwest winds to 30 knots becoming west and
increasing to 40 knot gales overnight. rain showers with snow
showers likely. waves 7 to 10 feet building to 16 to 21 feet.
waves occasionally around 27 feet. 
.saturday...west gales to 40 knots becoming north and diminishing
to 5 to 10 knots. snow showers likely during the day. waves 16 to
21 feet subsiding to 2 to 4 feet. waves occasionally around
27 feet. 
.sunday...east winds 15 to 25 knots becoming southeast and
increasing to 40 knot gales. snow showers likely during the day,
then a chance of rain and snow showers likely sunday night. waves
2 to 4 feet building to 9 to 12 feet. waves occasionally around
15 feet. 
.monday...south gales to 40 knots becoming west. rain and snow
showers. waves 9 to 12 feet building to 15 to 19 feet. waves
occasionally around 24 feet. 

$$