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open lake forecast for lake ontario
national weather service buffalo ny
402 am 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.


loz065-291600-
lake ontario open waters from mexico bay to the saint lawrence
river-
402 am est mon dec 29 2025

...storm warning in effect from 1 pm est this afternoon through
this evening...

.today...south winds to 30 knots becoming southwest and
increasing to 45 knot gales this afternoon. rain showers with a
chance of snow showers this morning, then lake effect snow
showers with a chance of lake effect rain showers this afternoon.
waves 6 to 9 feet building to 17 to 22 feet. waves occasionally
around 28 feet. 
.tonight...southwest storm force winds to 50 knots becoming west
and diminishing to 45 knot gales after midnight. lake effect snow
showers. waves 18 to 23 feet subsiding to 15 to 20 feet. waves
occasionally around 29 feet. 
.tuesday...west gales to 40 knots. lake effect snow showers.
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 in the evening, then lake effect snow
showers overnight. waves 12 to 16 feet subsiding to 7 to 10 feet.
waves occasionally around 20 feet. 
.wednesday...west winds to 30 knots becoming northwest and
diminishing to 15 to 20 knots. lake effect snow showers. waves
7 to 11 feet subsiding to 3 to 6 feet. waves occasionally around
14 feet. 
.thursday...northwest winds 10 to 15 knots becoming west. snow
showers likely during the day, then a chance of snow showers
thursday night. waves 2 to 4 feet building to 3 to 6 feet. 
.friday...west winds 15 to 20 knots. a chance of snow showers.
waves 3 to 6 feet building to 4 to 7 feet. waves occasionally
around 9 feet. 

$$

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


slz022-024-291600-
saint lawrence river from cape vincent to saint regis
402 am est mon dec 29 2025

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

.today...east winds 15 to 25 knots becoming southwest to
30 knots. rain showers and freezing rain this morning, then lake
effect snow showers likely with a chance of lake effect rain
showers this afternoon. 
.tonight...southwest winds to 30 knots becoming west. lake effect
snow showers. 
.tuesday...west winds to 30 knots diminishing to 15 to 25 knots.
lake effect snow showers in the morning, then a chance of snow
showers in the afternoon. 
.tuesday night...west winds 15 to 25 knots diminishing to 10 to
15 knots. a chance of snow showers overnight. 
.wednesday...southwest winds 5 to 15 knots becoming west. lake
effect snow showers likely. 
.thursday...southwest winds 10 knots or less. a chance of snow
showers. 
.friday...southwest winds 10 knots or less. a chance of snow
showers. 

$$