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open lake forecast for lake ontario
national weather service buffalo ny
1002 am est sat dec 13 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 29.6 inch low over western quebec this late morning 
will advance towards southern quebec tonight while weakening to 29.9 
inches, all while dragging an attendant cold front across the lake 
through the early afternoon. a strong 30.8 inch high over the mid 
mississippi valley sunday will then settle across the southeast 
states monday and tuesday while weakening to 30.3 inches. meanwhile, 
a strong 29.1 inch low over the southern canadian prairies tuesday 
will strengthen to 28.7 inches while quickly shifting east across 
northwestern ontario and into central quebec by wednesday...while 
pushing an attendant warm front across the lake tuesday, followed by 
a cold front on wednesday.


loz064-065-132200-
lake ontario open waters from sodus bay to the saint lawrence
river-
1002 am est sat dec 13 2025

.rest of today...southwest winds to 30 knots becoming west. lake
effect snow showers, then a chance of snow showers late. waves
5 to 8 feet building to 9 to 13 feet. waves occasionally around
16 feet. 
.tonight...west winds to 30 knots diminishing to 15 to 20 knots.
lake effect snow showers. waves 9 to 12 feet subsiding to 5 to
8 feet. waves occasionally around 15 feet. 
.sunday...northwest winds 15 to 20 knots. lake effect snow in the
morning, then a chance of snow showers in the afternoon. waves
4 to 7 feet subsiding to 3 to 6 feet. waves occasionally around
9 feet. 
.sunday night...northwest winds 15 to 20 knots. a chance of snow
showers. waves 3 to 6 feet. 
.monday...southwest winds to 30 knots becoming west 15 to
25 knots. lake effect snow. waves 2 to 4 feet building to 6 to
10 feet. waves occasionally around 13 feet. 
.tuesday...west winds 15 to 25 knots becoming south to 30 knots.
a chance of snow showers during the day. waves 4 to 7 feet. waves
occasionally around 9 feet. 
.wednesday...southwest winds to 30 knots becoming south and
diminishing to 15 to 20 knots. a chance of rain showers during
the day. waves 6 to 10 feet subsiding to 3 to 5 feet. waves
occasionally around 13 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 am est sat dec 13 2025


slz022-132200-
saint lawrence river from cape vincent to ogdensburg-
1002 am est sat dec 13 2025

.this afternoon...south winds 15 to 20 knots becoming southwest.
lake effect snow showers, then a chance of snow showers late. 
.tonight...southwest winds 15 to 20 knots becoming west 5 to
15 knots. mostly cloudy. 
.sunday...northwest winds 10 knots or less. partly to mostly
sunny. 
.sunday night...northwest winds 10 knots or less becoming west.
partly to mostly cloudy. 
.monday...west winds 10 knots or less becoming southwest. lake
effect snow. 
.tuesday...southwest winds 10 knots or less becoming south and
increasing to 15 to 20 knots. mostly cloudy. 
.wednesday...southwest winds 15 to 20 knots becoming south 5 to
15 knots. a chance of rain showers during the day. 

$$