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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est tue dec 2 2025

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 29.3 inch surface low off the northeast coast this 
evening will deepen to 28.9 inches over southern atlantic canada by 
early wednesday morning before going out to sea. a 30.2 inch surface 
high will build across the ohio valley and lower great lakes later 
wednesday into thursday morning before pushing off the coast. a 
large 29.2 inch surface low near hudson bay will push its cold front 
across the lake wednesday night, with another 30.4 inch high 
building in its wake thursday night. the high will then quickly move 
east of the lake friday. another cold front will cross the lake late 
saturday and saturday night, this from a 29.3 inch low near northern 
james bay. then, another area of surface high pressure averaging 
30.3 inches will build eastward across the great lakes through 
sunday.


loz064-065-030400-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 pm est tue dec 2 2025

.tonight...north winds 15 to 20 knots becoming northwest 5 to
15 knots. waves 1 to 3 feet. 
.wednesday...southwest winds 5 to 15 knots increasing to 15 to
25 knots. a chance of snow showers in the morning. a chance of
snow showers late. waves 1 foot or less building to 3 to 6 feet. 
.wednesday night...southwest winds to 30 knots becoming west.
lake effect snow and rain showers. waves 5 to 9 feet building to
7 to 11 feet. waves occasionally around 14 feet. 
.thursday...west winds to 30 knots becoming northwest. lake
effect snow showers. waves 8 to 11 feet building to 9 to 13 feet.
waves occasionally around 16 feet. 
.thursday night...northwest winds to 30 knots becoming south and
diminishing to 10 to 15 knots overnight. a chance of snow showers
overnight. waves 8 to 11 feet subsiding to 1 to 3 feet. waves
occasionally around 14 feet. 
.friday...south winds 15 to 25 knots becoming southwest. a chance
of snow showers. waves 3 to 6 feet. 
.saturday...southwest winds 15 to 25 knots becoming northwest.
snow showers likely. waves 3 to 6 feet building to 4 to 7 feet,
then subsiding to 3 to 6 feet. waves occasionally around 9 feet. 
.sunday...northwest winds 15 to 20 knots becoming north 10 to
15 knots. snow showers likely during the day, then a chance of
snow showers sunday night. waves 3 to 5 feet subsiding to 1 to
3 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est tue dec 2 2025


slz022-030400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est tue dec 2 2025

.tonight...north winds 5 to 10 knots becoming light and variable.
mostly cloudy. 
.wednesday...south winds 10 knots or less becoming southwest
10 to 15 knots. a chance of snow showers in the afternoon. 
.wednesday night...southwest winds 15 to 20 knots becoming west
10 to 15 knots. lake effect snow showers. 
.thursday...west winds 10 to 15 knots becoming northwest. lake
effect snow showers likely. 
.thursday night...northwest winds 5 to 15 knots becoming south
less than 10 knots. mainly clear. 
.friday...south winds 5 to 15 knots. a chance of snow showers. 
.saturday...south winds 5 to 10 knots becoming west. snow showers
likely. 
.sunday...northwest winds less than 10 knots becoming north. a
chance of snow showers during the day. 

$$