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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt mon sep 7 2026


slz022-024-080900-
saint lawrence river from cape vincent to saint regis
1003 pm edt mon sep 7 2026

.overnight...southwest winds less than 10 knots. a chance
of showers late. 
.tuesday...light and variable winds. a chance of showers in the
morning. 
.tuesday night...northeast winds less than 10 knots. mostly
cloudy. 
.wednesday...south winds 5 to 15 knots. a chance of showers in
the morning, then showers with a chance of thunderstorms in the
afternoon. 
.wednesday night...southwest winds 15 to 20 knots diminishing to
10 to 15 knots. showers with a chance of thunderstorms in the
evening, then showers overnight. 
.thursday...southwest winds 5 to 15 knots becoming northwest.
partly to mostly cloudy. 
.friday...northwest winds less than 10 knots becoming south.
mainly clear. 
.saturday...south winds 5 to 10 knots. mainly clear, then
becoming partly cloudy. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt mon sep 7 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 30.2 inch high over the lower great lakes this evening 
will settle south toward the mid atlantic region through the 
overnight. this high will then drift to the eastern seaboard 
tuesday, then east of the mid atlantic coast by wednesday. 
meanwhile, a 29.3 inch low over far northwest ontario province 
tuesday night will move to hudson bay by late wednesday, then to 
northern quebec by thursday while deepening to 29.0 inches. a 
trailing cold front will cross the lower great lakes wednesday 
night, followed by a 30.0 inch high building east across the eastern 
great lakes region thursday through friday, before sliding east into 
new england by saturday.


loz063>065-080900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt mon sep 7 2026

.overnight...southwest winds 5 to 10 knots. waves 2 feet or
less. 
.tuesday...west winds 5 to 10 knots becoming northwest. waves
2 feet or less. 
.tuesday night...southeast winds 10 knots or less becoming south
10 to 15 knots. waves 2 feet or less. 
.wednesday...south winds 15 to 20 knots. a chance of showers in
the morning, then showers likely with a chance of thunderstorms
in the afternoon. waves 1 to 3 feet. 
.wednesday night...southwest winds 15 to 25 knots becoming west.
showers with a chance of thunderstorms in the evening, then
showers overnight. waves 3 to 6 feet. 
.thursday...west winds 15 to 20 knots becoming northwest. waves
3 to 6 feet. 
.friday...north winds 5 to 15 knots becoming south. waves 1 to
3 feet subsiding to 1 foot or less. 
.saturday...south winds 10 to 15 knots increasing to 15 to
20 knots. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$