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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt sat may 2 2026


slz022-024-021500-
saint lawrence river from cape vincent to saint regis
403 am edt sat may 2 2026

.today...southwest winds 10 knots or less becoming west. a chance
of rain showers from late morning on. 
.tonight...southwest winds 10 knots or less becoming west. a
chance of rain showers early. 
.sunday...west winds 10 knots or less becoming southwest 10 to
15 knots. mostly sunny. 
.sunday night...southwest winds 5 to 15 knots. a chance of
showers. 
.monday...southwest winds 15 to 20 knots becoming south 5 to
15 knots. a chance of showers. 
.tuesday...southwest winds 5 to 15 knots becoming west less than
10 knots. showers likely. 
.wednesday...west winds 10 knots or less becoming southwest.
showers likely during the day, then a chance of showers wednesday
night. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt sat may 2 2026

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 29.7 inch low across quebec will retrograde 
northwestward to james bay today. at the same time another 29.7 inch 
low will deepen to 29.2 inches as it tracks from the southeastern 
states to atlantic canada through sunday, while a 30.2 inch high 
ridges across the lower great lakes, then western new england. a 
29.1 inch low over western ontario province monday will then weaken 
to 29.3 inches as it moves to northern quebec through tuesday, with 
its trailing cold front slowly crossing the lake tuesday.


loz062-021500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt sat may 2 2026

.today...west winds 10 to 15 knots. waves 1 to 3 feet. 
.tonight...west winds 5 to 15 knots. waves 1 to 2 feet. 
.sunday...west winds 10 to 15 knots becoming southwest 15 to
20 knots. waves 1 to 2 feet building to 2 to 4 feet. 
.sunday night...southwest winds 15 to 25 knots. a chance of
showers. waves 3 to 6 feet. 
.monday...southwest winds 15 to 20 knots. a chance of showers.
waves 3 to 6 feet. 
.tuesday...southwest winds 15 to 20 knots becoming north 5 to
15 knots. showers likely. waves 3 to 5 feet subsiding to 1 to
2 feet. 
.wednesday...northwest winds 5 to 10 knots. showers likely during
the day, then a chance of showers wednesday night. waves 1 foot
or less. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt sat may 2 2026

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 29.7 inch low across quebec will retrograde 
northwestward to james bay today. at the same time another 29.7 inch 
low will deepen to 29.2 inches as it tracks from the southeastern 
states to atlantic canada through sunday, while a 30.2 inch high 
ridges across the lower great lakes, then western new england. a 
29.1 inch low over western ontario province monday will then weaken 
to 29.3 inches as it moves to northern quebec through tuesday, with 
its trailing cold front slowly crossing the lake tuesday.


loz063>065-021500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt sat may 2 2026

.today...west winds 10 to 15 knots. waves 1 to 3 feet building to
2 to 4 feet. 
.tonight...west winds 10 to 15 knots. waves 1 to 3 feet. 
.sunday...west winds 10 to 15 knots becoming southwest. waves
1 to 3 feet. 
.sunday night...southwest winds 15 to 20 knots. a chance of
showers. waves 1 to 3 feet building to 3 to 6 feet. 
.monday...southwest winds 15 to 20 knots becoming south. a chance
of showers. waves 3 to 6 feet subsiding to 3 to 5 feet. 
.tuesday...southwest winds 15 to 20 knots becoming north 5 to
15 knots. showers likely with a chance of thunderstorms. waves
3 to 5 feet subsiding to 1 to 3 feet. 
.wednesday...northwest winds 5 to 10 knots becoming west. showers
likely. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$