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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt thu jul 3 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...an expansive 30.1 inch area of high pressure will build 
eastward across the great lakes tonight and friday...before drifting 
to the eastern seaboard saturday. a wavy cold frontal boundary is 
then forecast to slowly push southeastward across the upper great 
lakes and southern ontario during sunday, then across the lower 
great lakes on monday. a 30.1 inch surface high will build across 
the lower great lakes on tuesday.


loz063>065-040900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt thu jul 3 2025

.overnight...northwest winds 5 to 15 knots becoming north.
waves 2 to 4 feet subsiding to 1 to 2 feet. 
.friday...north winds 5 to 10 knots becoming southwest. waves
1 foot or less. 
.friday night...southwest winds 5 to 10 knots becoming south.
waves 1 foot or less. 
.saturday...south winds 5 to 10 knots. waves 1 foot or less. 
.saturday night...south winds 5 to 15 knots. waves 2 feet or
less. 
.sunday...southwest winds 5 to 15 knots becoming south. waves
1 to 2 feet. 
.monday...southwest winds 5 to 10 knots becoming north. a chance
of showers and thunderstorms. waves 1 to 2 feet. 
.tuesday...north winds 5 to 10 knots. a chance of showers during
the day. 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
1002 pm edt thu jul 3 2025


slz022-024-040900-
saint lawrence river from cape vincent to saint regis
1002 pm edt thu jul 3 2025

.overnight...northwest winds less than 10 knots. mainly
clear. 
.friday...northwest winds less than 10 knots becoming west.
sunny.
.friday night...south winds less than 10 knots. mainly clear in
the evening, then becoming mostly cloudy. 
.saturday...south winds 10 knots or less becoming southwest.
partly sunny. 
.saturday night...southwest winds 5 to 10 knots. partly to mostly
cloudy. 
.sunday...southwest winds 5 to 10 knots. a chance of showers. 
.monday...southwest winds 10 knots or less becoming north. a
chance of showers and thunderstorms. 
.tuesday...north winds less than 10 knots becoming northeast.
partly cloudy. 

winds and waves higher in and near thunderstorms.

$$