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


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

.overnight...light and variable winds. partly cloudy. 
.wednesday...southwest winds 10 knots or less. sunny.
.wednesday night...southwest winds 10 knots or less. partly
cloudy. 
.thursday...southwest winds 10 knots or less becoming west. a
chance of showers in the morning, then showers with a chance of
thunderstorms in the afternoon. 
.thursday night...southwest winds 5 to 10 knots becoming light
and variable. showers with a chance of thunderstorms in the
evening, then showers overnight. 
.friday...northwest winds less than 10 knots becoming north. a
chance of showers during the day. 
.saturday...north winds less than 10 knots. mainly clear. 
.sunday...light and variable winds. 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 tue jul 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 29.9 inch low continues to move off the southern new 
england coast, while a broad 30.1 inch high builds across the lower 
great lakes tonight through wednesday. a weak cold front will cross 
the lake thursday night through early friday with another 30.1 inch 
high building across the upper great lakes friday and the lower 
great lakes by saturday night.


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

.overnight...southeast winds 5 to 10 knots. waves 1 foot or
less. 
.wednesday...south winds 10 knots or less becoming north. waves
1 foot or less. 
.wednesday night...southwest winds 10 knots or less. waves 1 foot
or less. 
.thursday...southwest winds 5 to 10 knots. waves 1 foot or less. 
.thursday night...southwest winds 5 to 10 knots becoming west.
showers likely. waves 2 feet or less. 
.friday...northwest winds 5 to 10 knots becoming northeast.
showers likely during the day. waves 2 feet or less. 
.saturday...northeast winds 10 knots or less becoming east. waves
1 foot or less. 
.sunday...southeast winds 10 knots or less becoming southwest.
waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$