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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm 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>065-011000-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm est wed dec 31 2025

.overnight...west winds to 30 knots becoming northwest.
lake effect snow, then a chance of snow showers late. waves 4 to
7 feet building to 6 to 9 feet. waves occasionally around
11 feet. 
.thursday...northwest winds to 30 knots becoming west and
diminishing to 15 to 20 knots. snow showers. waves 5 to 8 feet
subsiding to 3 to 6 feet. waves occasionally around 10 feet. 
.thursday night...northwest winds 15 to 25 knots becoming west.
lake effect snow showers. waves 5 to 8 feet. waves occasionally
around 10 feet. 
.friday...west winds 15 to 25 knots. lake effect snow showers.
waves 5 to 9 feet. waves occasionally around 11 feet. 
.friday night...west winds 15 to 25 knots becoming northwest.
lake effect snow showers. waves 5 to 9 feet subsiding to 4 to
7 feet. waves occasionally around 11 feet. 
.saturday...northwest winds 15 to 20 knots diminishing to 5 to
15 knots. lake effect snow showers likely during the day, then a
chance of snow showers saturday night. waves 4 to 7 feet
subsiding to 1 to 3 feet. waves occasionally around 9 feet. 
.sunday...northwest winds 10 to 15 knots. a chance of snow
showers. waves 1 to 3 feet building to 2 to 4 feet, then
subsiding to 1 to 3 feet. 
.monday...southwest winds 10 to 15 knots. a chance of snow
showers during the day, then a chance of snow and rain showers
monday night. 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 pm est wed dec 31 2025


slz022-024-011000-
saint lawrence river from cape vincent to saint regis
1002 pm est wed dec 31 2025

.rest of tonight...north winds 10 to 15 knots becoming northwest
15 to 20 knots. snow likely late this evening, then a chance of
snow after midnight. a chance of snow showers late. 
.thursday...northwest winds 15 to 20 knots becoming west and
diminishing to 5 to 10 knots. mostly sunny. 
.thursday night...southwest winds less than 10 knots. partly
cloudy in the evening, then becoming mostly cloudy. 
.friday...light and variable winds becoming west 5 to 10 knots. a
chance of snow showers. 
.friday night...west winds less than 10 knots. a chance of snow
showers in the evening. 
.saturday...west winds less than 10 knots. a chance of snow
showers saturday night. 
.sunday...north winds less than 10 knots becoming northwest. a
chance of snow showers during the day. 
.monday...south winds less than 10 knots becoming southeast. a
chance of snow showers. 

$$