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open lake forecast for lake ontario
national weather service buffalo ny
402 am est fri dec 19 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 29.0 inch low near lake superior will deepen to 28.9 
inches while moving to central quebec by friday, with its trailing 
strong cold front crossing the lake early friday morning. in its 
wake, a 30.1 inch high will slowly build across the lake friday 
night and early saturday, then will drift off the atlantic coastline 
later saturday and saturday night, with a 29.5 inch low moving 
across ontario and quebec and pushing its attendant cold front 
across the lake sunday. a large 30.6 inch high will then build east 
across the lake monday.


loz062-191600-
lake ontario open waters from the niagara river to hamlin beach-
402 am est fri dec 19 2025

...gale warning in effect through late tonight...

.today...southwest winds to 30 knots becoming west and increasing
to 40 knot gales. rain showers this morning, then a chance of
snow showers this afternoon. waves 6 to 9 feet building to 12 to
16 feet. waves occasionally around 20 feet. 
.tonight...west gales to 40 knots diminishing to 15 to 25 knots.
a chance of snow showers in the evening. waves 12 to 17 feet
subsiding to 7 to 10 feet. waves occasionally around 22 feet. 
.saturday...southwest winds 15 to 25 knots becoming south. waves
3 to 6 feet. 
.saturday night...southwest winds to 30 knots becoming west. a
chance of rain showers. waves 4 to 7 feet building to 10 to
13 feet. waves occasionally around 16 feet. 
.sunday...west gales to 35 knots diminishing to 15 to 20 knots. a
chance of snow showers. waves 10 to 14 feet subsiding to 3 to
6 feet. waves occasionally around 18 feet. 
.monday...west winds 10 to 15 knots becoming south. a chance of
snow and rain showers monday night. waves 1 to 3 feet. 
.tuesday...southwest winds 15 to 20 knots becoming northwest. a
chance of rain and snow showers during the day. waves 1 to 3 feet
building to 3 to 5 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am est fri dec 19 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 29.0 inch low near lake superior will deepen to 28.9 
inches while moving to central quebec by friday, with its trailing 
strong cold front crossing the lake early friday morning. in its 
wake, a 30.1 inch high will slowly build across the lake friday 
night and early saturday, then will drift off the atlantic coastline 
later saturday and saturday night, with a 29.5 inch low moving 
across ontario and quebec and pushing its attendant cold front 
across the lake sunday. a large 30.6 inch high will then build east 
across the lake monday.


loz063-191600-
lake ontario open waters from hamlin beach to sodus bay-
402 am est fri dec 19 2025

...gale warning in effect through late tonight...

.today...southwest winds to 30 knots becoming west and increasing
to 40 knot gales this afternoon. rain showers this morning, then
a chance of rain and snow showers early this afternoon. a chance
of snow showers late. waves 5 to 8 feet building to 14 to
18 feet. waves occasionally around 23 feet. 
.tonight...west gales to 40 knots diminishing to 30 knots. a
chance of snow showers through the early overnight. waves 15 to
20 feet subsiding to 10 to 14 feet. waves occasionally around
26 feet. 
.saturday...west winds 15 to 20 knots becoming south. waves 6 to
9 feet subsiding to 2 to 4 feet. waves occasionally around
11 feet. 
.saturday night...south winds 15 to 25 knots becoming west and
increasing to 35 knot gales overnight. a chance of rain showers.
waves 3 to 6 feet building to 10 to 14 feet. waves occasionally
around 18 feet. 
.sunday...west gales to 40 knots becoming northwest and
diminishing to 15 to 20 knots. snow showers likely. waves 13 to
17 feet subsiding to 5 to 8 feet. waves occasionally around
22 feet. 
.monday...west winds 10 to 15 knots becoming south 15 to
20 knots. a chance of snow showers monday night. waves 2 to
4 feet subsiding to 1 to 3 feet. 
.tuesday...south winds 15 to 25 knots becoming northwest. rain
and snow showers likely during the day, then a chance of rain
showers tuesday night. waves 2 to 4 feet building to 4 to 7 feet.
waves occasionally around 9 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am est fri dec 19 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 29.0 inch low near lake superior will deepen to 28.9 
inches while moving to central quebec by friday, with its trailing 
strong cold front crossing the lake early friday morning. in its 
wake, a 30.1 inch high will slowly build across the lake friday 
night and early saturday, then will drift off the atlantic coastline 
later saturday and saturday night, with a 29.5 inch low moving 
across ontario and quebec and pushing its attendant cold front 
across the lake sunday. a large 30.6 inch high will then build east 
across the lake monday.


loz064-065-191600-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 am est fri dec 19 2025

...gale warning in effect through late tonight...

.today...south winds to 30 knots becoming west and increasing to
40 knot gales this afternoon. rain showers this morning, then a
chance of rain and snow showers early this afternoon. a chance of
snow showers late. waves 6 to 9 feet building to 14 to 18 feet.
waves occasionally around 23 feet. 
.tonight...west gales to 45 knots diminishing to 30 knots after
midnight. snow showers likely in the evening, then a chance of
snow showers after midnight. waves 16 to 21 feet subsiding to
11 to 15 feet. waves occasionally around 27 feet. 
.saturday...west winds 15 to 25 knots becoming south. waves 6 to
9 feet subsiding to 3 to 6 feet. waves occasionally around
11 feet. 
.saturday night...south winds to 30 knots becoming west and
increasing to 35 knot gales overnight. a chance of rain showers
in the evening, then a chance of snow and rain showers overnight.
waves 5 to 8 feet building to 10 to 14 feet. waves occasionally
around 18 feet. 
.sunday...west gales to 35 knots becoming northwest and
diminishing to 15 to 20 knots. lake effect snow showers likely.
waves 13 to 17 feet subsiding to 6 to 9 feet. waves occasionally
around 22 feet. 
.monday...northwest winds 10 to 15 knots becoming south 15 to
20 knots. a chance of snow showers monday night. waves 2 to
4 feet. 
.tuesday...south winds 15 to 25 knots becoming northwest. rain
and snow showers likely during the day, then a chance of rain
showers tuesday night. 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 fri dec 19 2025


slz022-191600-
saint lawrence river from cape vincent to ogdensburg-
402 am est fri dec 19 2025

...small craft advisory in effect through this evening...

.today...south winds 15 to 25 knots becoming southwest. rain
showers this morning, then a chance of rain showers early this
afternoon. a chance of snow and rain showers late. 
.tonight...west winds 15 to 25 knots. a chance of snow showers in
the evening. 
.saturday...west winds 5 to 15 knots becoming south. mostly sunny
in the morning, then becoming mostly cloudy. 
.saturday night...south winds 15 to 20 knots becoming southwest.
a chance of snow and rain showers in the evening, then lake
effect snow and rain showers likely overnight. 
.sunday...west winds 15 to 20 knots becoming northwest 5 to
15 knots. snow showers likely during the day. 
.monday...west winds 10 knots or less becoming south. a chance of
snow showers monday night. 
.tuesday...south winds 5 to 10 knots becoming west. snow showers
with rain showers likely during the day, then snow and rain
showers likely tuesday night. 

$$