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open lake forecast for lake ontario
national weather service buffalo ny
402 am est thu dec 18 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 29.1 inch low near lake superior this morning, 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.


loz064-065-181600-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 am est thu dec 18 2025

...gale warning in effect from friday morning through late friday
night...

.today...south winds 15 to 25 knots increasing to 30 knots. waves
3 to 6 feet building to 5 to 8 feet. waves occasionally around
10 feet. 
.tonight...south winds to 30 knots. showers from late evening on.
waves 5 to 9 feet building to 7 to 10 feet. waves occasionally
around 13 feet. 
.friday...southwest winds to 30 knots becoming west and
increasing to 45 knot gales. lake effect rain and snow showers.
waves 7 to 10 feet building to 15 to 20 feet. waves occasionally
around 26 feet. 
.friday night...west gales to 45 knots diminishing to 15 to
25 knots overnight. lake effect snow showers. waves 16 to 21 feet
subsiding to 9 to 12 feet. waves occasionally around 27 feet. 
.saturday...west winds 10 to 15 knots becoming southwest and
increasing to 30 knots. a chance of snow and rain showers during
the day, then rain and snow showers likely saturday night. waves
4 to 7 feet building to 8 to 11 feet. waves occasionally around
14 feet. 
.sunday...west gales to 40 knots becoming northwest and
diminishing to 15 to 25 knots. snow showers likely during the
day, then a chance of snow showers sunday night. waves 11 to
16 feet subsiding to 7 to 10 feet. waves occasionally around
20 feet. 
.monday...northwest winds 15 to 20 knots becoming south. a chance
of snow showers monday 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 am est thu dec 18 2025


slz022-181600-
saint lawrence river from cape vincent to ogdensburg-
402 am est thu dec 18 2025

.today...south winds 5 to 15 knots increasing to 15 to 20 knots.
partly sunny. 
.tonight...south winds 15 to 25 knots. rain showers from late
evening on. 
.friday...southwest winds 15 to 25 knots. rain showers in the
morning, then rain showers with snow showers likely in the
afternoon. 
.friday night...west winds 15 to 25 knots diminishing to 5 to
10 knots overnight. snow showers likely in the evening, then a
chance of snow showers overnight. 
.saturday...southwest winds 5 to 15 knots. a chance of snow
showers during the day, then snow and rain showers likely
saturday night. 
.sunday...southwest winds 5 to 15 knots becoming northwest. snow
showers likely during the day. 
.monday...west winds 10 knots or less becoming south. a chance of
snow showers monday night. 

$$