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open lake forecast for lake ontario
national weather service buffalo ny
1003 pm edt wed jul 16 2025

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 will track northeastward across the 
great lakes and into quebec tonight and thursday, with its trailing 
cold front pushing across the lake thursday night. a 30.2 inch high 
will then build from the western great lakes to new england friday 
through saturday before drifting off the new england coast saturday 
night. a 29.8 inch low will then push east across the great lakes 
saturday night before reaching new england sunday.


loz063>065-170900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1003 pm edt wed jul 16 2025

.overnight...south winds 5 to 15 knots. showers likely with
a chance of thunderstorms. waves 2 feet or less. 
.thursday...south winds 10 to 15 knots becoming west and
increasing to 15 to 25 knots. a chance of showers and
thunderstorms in the morning, then showers likely with a chance
of thunderstorms in the afternoon. waves 1 to 2 feet building to
3 to 6 feet. 
.thursday night...west winds 15 to 25 knots becoming north. waves
5 to 8 feet subsiding to 3 to 6 feet. waves occasionally around
10 feet. 
.friday...north winds 15 to 20 knots becoming west and
diminishing to 10 knots or less in the afternoon. waves 3 to
5 feet subsiding to 1 foot or less. 
.friday night...southwest winds 10 knots or less becoming south.
waves 1 foot or less. 
.saturday...south winds 5 to 10 knots becoming southwest. a
chance of showers saturday night. waves 1 foot or less. 
.sunday...northwest winds 5 to 10 knots becoming northeast. a
chance of showers during the day. waves 2 feet or less. 
.monday...northeast winds 5 to 10 knots becoming southeast. waves
2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt wed jul 16 2025


slz022-024-170900-
saint lawrence river from cape vincent to saint regis
1003 pm edt wed jul 16 2025

.overnight...southwest winds less than 10 knots becoming
south. a chance of showers. 
.thursday...south winds 5 to 15 knots becoming southwest 15 to
20 knots. a chance of showers early, then a chance of showers and
thunderstorms late in the morning. showers likely with a chance
of thunderstorms in the afternoon. 
.thursday night...west winds 5 to 15 knots becoming northwest.
showers likely with a chance of thunderstorms in the evening,
then a chance of showers overnight. 
.friday...northwest winds 10 knots or less. sunny.
.friday night...west winds less than 10 knots. mainly clear in
the evening, then becoming partly cloudy. 
.saturday...southwest winds 10 knots or less. a chance of showers
saturday night. 
.sunday...north winds less than 10 knots. a chance of showers
during the day. 
.monday...north winds less than 10 knots becoming southeast.
mainly clear. 

winds and waves higher in and near thunderstorms.

$$