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open lake forecast for lake ontario
national weather service buffalo ny
402 am est tue nov 11 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 29.2 inch low will move north across eastern quebec 
through tonight while strengthening to 28.2 inches. this low will 
then exit northeast across labrador wednesday. another 29.2 inch low 
will develop south of nova scotia thursday, then move north across 
the canadian maritimes friday, remaining in place through saturday. 
meanwhile, a 30.1 inch high will then build from northwest ontario 
province friday to james bay and the lower great lakes by saturday.


loz062-111600-
lake ontario open waters from the niagara river to hamlin beach-
402 am est tue nov 11 2025

.today...northwest winds to 30 knots becoming west. a chance of
snow showers through early afternoon, then a chance of rain
showers late. waves 5 to 8 feet building to 6 to 9 feet. waves
occasionally around 11 feet. 
.tonight...west winds 15 to 25 knots becoming southwest. a chance
of rain showers early, then lake effect rain showers late in the
evening. lake effect rain and snow showers after midnight. waves
5 to 8 feet. waves occasionally around 10 feet. 
.wednesday...southwest winds 15 to 25 knots becoming west. lake
effect rain showers. waves 3 to 6 feet building to 5 to 8 feet.
waves occasionally around 10 feet. 
.wednesday night...west winds 20 to 25 knots. showers. waves 6 to
9 feet. waves occasionally around 11 feet. 
.thursday...west winds to 30 knots diminishing to 15 to 20 knots.
showers likely. waves 6 to 9 feet subsiding to 3 to 5 feet. waves
occasionally around 11 feet. 
.friday...northwest winds 10 to 15 knots becoming north. a chance
of rain showers during the day. waves 1 to 3 feet. 
.saturday...northeast winds 5 to 15 knots becoming southeast. a
chance of rain showers saturday night. waves 2 feet or less. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am est tue nov 11 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 29.2 inch low will move north across eastern quebec 
through tonight while strengthening to 28.2 inches. this low will 
then exit northeast across labrador wednesday. another 29.2 inch low 
will develop south of nova scotia thursday, then move north across 
the canadian maritimes friday, remaining in place through saturday. 
meanwhile, a 30.1 inch high will then build from northwest ontario 
province friday to james bay and the lower great lakes by saturday.


loz063>065-111600-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am est tue nov 11 2025

.today...northwest winds to 30 knots becoming west. snow showers
likely this morning, then a chance of snow and rain showers early
this afternoon. a chance of rain showers late. waves 6 to 10 feet
building to 8 to 11 feet. waves occasionally around 14 feet. 
.tonight...west winds to 30 knots becoming southwest. rain
showers likely in the evening, then lake effect rain showers with
lake effect snow showers likely after midnight. waves 7 to
11 feet subsiding to 6 to 9 feet. waves occasionally around
14 feet. 
.wednesday...southwest winds 20 to 25 knots becoming west. lake
effect rain showers with lake effect snow showers likely in the
morning, then lake effect rain showers in the afternoon. waves
5 to 8 feet building to 6 to 9 feet. waves occasionally around
11 feet. 
.wednesday night...west winds to 30 knots. lake effect showers.
waves 6 to 10 feet. waves occasionally around 13 feet. 
.thursday...west winds to 30 knots becoming northwest 15 to
25 knots. rain showers. waves 8 to 11 feet subsiding to 3 to
6 feet. waves occasionally around 14 feet. 
.friday...northwest winds 15 to 20 knots becoming north 10 to
15 knots. rain showers likely during the day. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.saturday...north winds 5 to 15 knots becoming southeast. a
chance of rain showers saturday night. waves 2 feet or less. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am est tue nov 11 2025


slz022-111600-
saint lawrence river from cape vincent to ogdensburg-
402 am est tue nov 11 2025

.today...west winds 5 to 15 knots. a chance of snow showers
through early afternoon. 
.tonight...west winds 5 to 15 knots becoming southwest. a chance
of snow showers late in the evening. snow showers likely after
midnight, then lake effect snow and rain showers late. 
.wednesday...south winds 5 to 15 knots becoming southwest. lake
effect snow and rain showers. 
.wednesday night...southwest winds 5 to 10 knots becoming west.
rain showers in the evening, then rain showers with a chance of
snow showers overnight. 
.thursday...west winds 10 knots or less. rain and snow showers
likely during the day, then a chance of rain and snow showers
thursday night. 
.friday...northwest winds 10 knots or less. a chance of snow and
rain showers during the day. 
.saturday...northwest winds less than 10 knots becoming
southeast. a chance of rain and snow showers saturday night. 

$$