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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est mon dec 29 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.


loz065-300400-
lake ontario open waters from mexico bay to the saint lawrence
river-
402 pm est mon dec 29 2025

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

.tonight...southwest storm force winds to 50 knots becoming west
and diminishing to 45 knot gales after midnight. snow showers.
waves 18 to 23 feet subsiding to 15 to 20 feet. waves
occasionally around 29 feet. 
.tuesday...west gales to 40 knots. snow showers likely early,
then a chance of snow showers from late morning on. waves 14 to
18 feet subsiding to 13 to 17 feet. waves occasionally around
23 feet. 
.tuesday night...west gales to 40 knots diminishing to 30 knots.
a chance of snow showers. waves 13 to 17 feet subsiding to 7 to
11 feet. waves occasionally around 22 feet. 
.wednesday...northwest winds 15 to 20 knots. lake effect snow
showers. waves 7 to 11 feet. waves occasionally around 14 feet. 
.wednesday night...northwest winds 15 to 25 knots. snow showers
in the evening, then snow showers likely overnight. waves 8 to
11 feet subsiding to 2 to 4 feet. waves occasionally around
14 feet. 
.thursday...northwest winds 15 to 20 knots becoming west. lake
effect snow showers. waves 2 to 4 feet building to 3 to 6 feet. 
.friday...west winds 15 to 25 knots becoming northwest. lake
effect snow showers likely. waves 3 to 6 feet building to 4 to
7 feet. waves occasionally around 9 feet. 
.saturday...northwest winds 10 to 15 knots becoming north. snow
showers likely during the day, then a chance of snow showers
saturday night. waves 3 to 5 feet subsiding to 2 to 4 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est mon dec 29 2025


slz022-024-300400-
saint lawrence river from cape vincent to saint regis
402 pm est mon dec 29 2025

...small craft advisory in effect through late tuesday night...

.tonight...southwest winds to 30 knots becoming west. snow
showers likely. 
.tuesday...west winds to 30 knots diminishing to 15 to 25 knots.
a chance of snow showers through early afternoon. 
.tuesday night...west winds 15 to 25 knots diminishing to 10 to
15 knots. partly to mostly cloudy. 
.wednesday...west winds 5 to 10 knots. a chance of snow showers
in the afternoon. 
.wednesday night...west winds less than 10 knots. a chance of
snow showers. 
.thursday...west winds 10 knots or less becoming southwest.
partly to mostly cloudy. 
.friday...southwest winds 10 knots or less becoming west. a
chance of snow showers. 
.saturday...northwest winds less than 10 knots. a chance of snow
showers saturday night. 

$$