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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 am edt thu apr 30 2026


slz022-024-302100-
saint lawrence river from cape vincent to saint regis
1003 am edt thu apr 30 2026

.this afternoon...northwest winds 5 to 10 knots becoming west.
mostly cloudy. 
.tonight...northwest winds 10 knots or less. partly to mostly
cloudy. 
.friday...northwest winds 10 knots or less becoming west. mostly
sunny. 
.friday night...southwest winds 10 knots or less. partly to
mostly cloudy. 
.saturday...west winds 10 knots or less. a chance of rain showers
during the day. 
.sunday...west winds 5 to 10 knots becoming southwest. a chance
of rain showers sunday night. 
.monday...southwest winds 10 to 15 knots. showers likely. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt thu apr 30 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...an elongated 29.7 inch low will move into central quebec 
this afternoon, while a 29.6 inch low develops and tracks northeast 
off the mid-atlantic and new england coastlines through this 
evening. this second low will then retrograde northward and then 
northwestward across the canadian maritimes and quebec respectively 
friday and saturday. a 29.7 inch low will then deepen to 29.2 inches 
as it tracks from the southeastern states northeast off the atlantic 
coast saturday through sunday, while a 30.2 inch high ridges across 
the lower great lakes. a 29.1 inch low will then pinwheel 
counterclockwise about ontario, quebec, and hudson bay monday 
through tuesday night, sending an attendant cold front across the 
lake tuesday.


loz063>065-302100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt thu apr 30 2026

.this afternoon...west winds 10 to 15 knots increasing to 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.tonight...west winds 15 to 20 knots becoming northwest 5 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.friday...northwest winds 5 to 10 knots becoming west. waves
2 feet or less. 
.friday night...west winds 5 to 10 knots. waves 1 to 2 feet. 
.saturday...west winds 5 to 15 knots. waves 1 to 2 feet. 
.sunday...west winds 10 to 15 knots becoming southwest 15 to
20 knots. a chance of rain showers sunday night. waves 1 to
3 feet building to 2 to 4 feet. 
.monday...south winds 15 to 20 knots becoming southwest. showers
likely. waves 2 to 4 feet building to 3 to 5 feet. 

$$