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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt mon jun 30 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 29.6 inch low will move from northwest ontario 
province today to east of hudson bay tuesday while deepening to 29.2 
inches. a cold front trailing this low will cross the lake tuesday 
morning. a 29.9 inch high will build into the upper great lakes 
wednesday and thursday. the high will then strengthen to 30.1 inches 
as it centers over the lake on friday.


loz063>065-010900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt mon jun 30 2025

.overnight...south winds 5 to 15 knots. showers likely with
a chance of thunderstorms. waves 2 feet or less. 
.tuesday...southwest winds 10 to 15 knots becoming west. a chance
of showers early. waves 1 to 3 feet. 
.tuesday night...west winds 10 to 15 knots. waves 1 to 3 feet. 
.wednesday...west winds 10 to 15 knots. waves 1 to 2 feet. 
.wednesday night...southwest winds 10 to 15 knots becoming west.
a chance of showers and thunderstorms overnight. waves 1 to
2 feet. 
.thursday...west winds 5 to 15 knots becoming northwest. a chance
of showers and thunderstorms during the day. waves 1 to 2 feet. 
.friday...northwest winds 5 to 10 knots becoming south. waves
1 foot or less. 
.saturday...south winds 5 to 15 knots. a chance of showers
saturday night. waves 1 foot or less building to 1 to 3 feet. 

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 mon jun 30 2025


slz022-024-010900-
saint lawrence river from cape vincent to saint regis
1002 pm edt mon jun 30 2025

.rest of tonight...south winds 10 knots or less. a chance of
showers and thunderstorms late this evening, then showers with a
chance of thunderstorms after midnight. 
.tuesday...southwest winds 5 to 10 knots. showers with a chance
of thunderstorms early, then a chance of showers and
thunderstorms from late morning on. 
.tuesday night...southwest winds 10 knots or less. a chance of
showers and thunderstorms in the evening. 
.wednesday...southwest winds 5 to 10 knots. sunny.
.wednesday night...southwest winds 10 knots or less. a chance of
showers overnight. 
.thursday...southwest winds 10 knots or less becoming northwest.
a chance of showers and thunderstorms. 
.friday...northwest winds less than 10 knots becoming southwest.
mainly clear, then becoming partly cloudy. 
.saturday...southwest winds 5 to 10 knots. a chance of showers
saturday night. 

winds and waves higher in and near thunderstorms.

$$