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open lake forecast for lake ontario
national weather service buffalo ny
1002 am est wed dec 31 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 29.8 inch low will pass just north of lake ontario 
this afternoon before reaching the saint lawrence valley tonight. a 
secondary 29.6 inch coastal low will develop over the gulf of maine 
thursday morning, with this low deepening to 28.8 inches as it moves 
north across the canadian maritimes thursday night through friday, 
then to northern quebec by saturday. a 30.3 inch high will then 
build from the western great lakes sunday to the lower great lakes 
by early monday.


loz063>065-312200-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am est wed dec 31 2025

.rest of today...west winds 15 to 20 knots. lake effect snow.
waves 5 to 9 feet subsiding to 3 to 6 feet. waves occasionally
around 11 feet. 
.tonight...northwest winds 15 to 20 knots. lake effect snow in
the evening, then lake effect snow showers likely after midnight.
a chance of snow showers late. waves 3 to 6 feet. 
.thursday...northwest winds 15 to 20 knots becoming west. lake
effect snow showers. waves 3 to 6 feet. 
.thursday night...west winds 15 to 25 knots. lake effect snow
showers. waves 5 to 8 feet building to 6 to 9 feet. waves
occasionally around 11 feet. 
.friday...west winds 15 to 25 knots becoming northwest. lake
effect snow showers. waves 6 to 10 feet subsiding to 5 to 8 feet.
waves occasionally around 13 feet. 
.saturday...northwest winds 15 to 20 knots diminishing to 10 to
15 knots. a chance of snow showers. waves 4 to 7 feet subsiding
to 1 to 3 feet. waves occasionally around 9 feet. 
.sunday...west winds 10 to 15 knots. a chance of snow showers.
waves 1 to 3 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 am est wed dec 31 2025


slz022-024-312200-
saint lawrence river from cape vincent to saint regis
1002 am est wed dec 31 2025

.this afternoon...west winds 5 to 15 knots becoming southwest.
snow showers likely late. 
.tonight...west winds 10 knots or less becoming northwest. lake
effect snow showers likely in the evening, then a chance of snow
showers after midnight. 
.thursday...west winds 5 to 10 knots. mostly sunny. 
.thursday night...southwest winds less than 10 knots. partly
cloudy in the evening, then becoming mostly cloudy. 
.friday...southwest winds 10 knots or less becoming west. a
chance of snow showers. 
.saturday...northwest winds 5 to 10 knots becoming light and
variable. a chance of snow showers saturday night. 
.sunday...southwest winds less than 10 knots. a chance of snow
showers during the day. 

$$