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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est tue dec 30 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...low pressure averaging 29.0 inches over georgian bay 
will move to northern new england and southern quebec today, then to 
the canadian maritimes by tuesday while deepening to 28.8 inches. a 
trough averaging 29.7 inches, will drop southward across the lake 
thursday and linger through friday.


loz065-310400-
lake ontario open waters from mexico bay to the saint lawrence
river-
402 pm est tue dec 30 2025

...gale warning in effect until midnight est tonight...

.tonight...west gales to 35 knots diminishing to 30 knots. a
chance of snow showers early. a chance of snow showers after
midnight. waves 12 to 16 feet subsiding to 7 to 10 feet. waves
occasionally around 20 feet. 
.wednesday...west winds 15 to 20 knots becoming northwest. lake
effect snow showers likely. waves 5 to 8 feet subsiding to 3 to
6 feet. waves occasionally around 10 feet. 
.wednesday night...northwest winds 15 to 20 knots. lake effect
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. 
.thursday...northwest winds 15 to 20 knots becoming west. a
chance of snow showers in the morning, then lake effect snow
showers in the afternoon. waves 3 to 6 feet building to 4 to
7 feet. waves occasionally around 9 feet. 
.thursday night...west winds 15 to 20 knots. lake effect snow
showers. waves 5 to 8 feet. waves occasionally around 10 feet. 
.friday...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 10 to 15 knots becoming north. a
chance of snow showers during the day. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.sunday...north winds 10 to 15 knots becoming southwest. 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
402 pm est tue dec 30 2025


slz022-024-310400-
saint lawrence river from cape vincent to saint regis
402 pm est tue dec 30 2025

...small craft advisory in effect until 1 am est wednesday...

.tonight...west winds 15 to 25 knots diminishing to 10 to
15 knots. a chance of snow showers this evening. 
.wednesday...west winds 5 to 10 knots. a chance of snow showers
late. 
.wednesday night...west winds 10 knots or less becoming
northwest. a chance of snow showers. 
.thursday...west winds 5 to 10 knots becoming southwest. 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 northwest. a
chance of snow showers. 
.saturday...northwest winds 10 knots or less. partly cloudy. 
.sunday...west winds less than 10 knots becoming south. a chance
of snow showers. 

$$