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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt fri may 1 2026


slz022-024-020300-
saint lawrence river from cape vincent to saint regis
403 pm edt fri may 1 2026

.tonight...west winds less than 10 knots becoming southwest. a
chance of rain showers late. 
.saturday...west winds 10 knots or less. a chance of rain showers
from late morning on. 
.saturday night...southwest winds 10 knots or less becoming west.
a chance of rain showers in the evening. 
.sunday...west winds 10 knots or less becoming southwest. mostly
sunny. 
.sunday night...southwest winds 5 to 10 knots. a chance of
showers overnight. 
.monday...southwest winds 5 to 15 knots becoming south. a chance
of showers. 
.tuesday...southwest winds 5 to 15 knots. showers likely. 
.wednesday...west winds 10 knots or less becoming southwest.
showers likely. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt fri may 1 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 atlantic canada will retrograde 
northwestward across the canadian maritimes and quebec through 
saturday. another 29.7 inch low will deepen to 29.2 inches as it 
tracks from the southeastern states northeast off the atlantic coast 
saturday and sunday, while a 30.2 inch high ridges across the lower 
great lakes. a 29.1 inch low will spin over ontario, quebec, and 
hudson bay monday through tuesday night, sending an attendant cold 
front across the lake tuesday.


loz063>065-020300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt fri may 1 2026

.tonight...southwest winds 5 to 10 knots becoming west. a chance
of rain showers early. waves 2 feet or less. 
.saturday...west winds 10 to 15 knots. waves 1 to 2 feet. 
.saturday night...west winds 5 to 10 knots becoming northwest.
waves 1 to 2 feet. 
.sunday...west winds 10 to 15 knots. waves 1 to 3 feet. 
.sunday night...southwest winds 10 to 15 knots increasing to
15 to 20 knots. a chance of showers. waves 1 to 3 feet building
to 2 to 4 feet. 
.monday...southwest winds 15 to 25 knots becoming south. a chance
of showers. waves 2 to 4 feet building to 3 to 5 feet. 
.tuesday...southwest winds 15 to 25 knots becoming west and
diminishing to 10 to 15 knots. showers likely. waves 3 to 6 feet
subsiding to 1 to 3 feet. 
.wednesday...northwest winds 15 to 20 knots becoming west 10 to
15 knots. showers likely. waves 2 to 4 feet subsiding to 1 to
3 feet. 

$$