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open lake forecast for lake ontario
national weather service buffalo ny
1001 pm edt wed apr 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 30.3 inch high will crest over the lower great lakes 
tonight, then depart towards new england on thursday. meanwhile a 
29.5 inch low will track near or just north of the lake thursday 
night and into central quebec on friday with its corresponding cold 
front crossing the lake friday. a 30.2 inch surface high will 
advance from the mid mississippi valley saturday morning to the ohio 
valley sunday morning, and then to near the lake monday morning.


loz063>065-010900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1001 pm edt wed apr 30 2025

.overnight...south winds 10 knots or less becoming
southeast. waves 1 foot or less. 
.thursday...east winds 10 to 15 knots increasing to 15 to
20 knots. rain showers with thunderstorms likely late. some
thunderstorms may produce gusty winds late. waves 1 to 3 feet
building to 2 to 4 feet. 
.thursday night...southeast winds 15 to 20 knots becoming south.
showers with thunderstorms likely in the evening, then showers
likely overnight. some thunderstorms may produce gusty winds in
the evening. waves 2 to 4 feet building to 3 to 5 feet. 
.friday...south winds 15 to 20 knots becoming west. showers
likely. waves 3 to 6 feet. 
.friday night...west winds 15 to 20 knots diminishing to 10 to
15 knots. a chance of showers. waves 3 to 6 feet subsiding to
1 to 3 feet. 
.saturday...west winds 10 to 15 knots becoming northwest. a
chance of showers. waves 1 to 3 feet. 
.sunday...northwest winds 10 to 15 knots becoming northeast.
waves 1 to 3 feet. 
.monday...northeast winds 10 to 15 knots becoming southeast. a
chance of showers monday night. waves 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
1001 pm edt wed apr 30 2025


slz022-024-010900-
saint lawrence river from cape vincent to saint regis
1001 pm edt wed apr 30 2025

.overnight...southwest winds less than 10 knots. partly
cloudy. 
.thursday...light and variable winds. mostly sunny in the
morning, then becoming mostly cloudy. 
.thursday night...east winds 5 to 15 knots becoming south.
showers with a chance of thunderstorms in the evening, then
showers likely overnight. 
.friday...south winds 10 to 15 knots becoming southwest 15 to
20 knots. showers likely. 
.friday night...southwest winds 5 to 15 knots becoming west less
than 10 knots. a chance of showers. 
.saturday...west winds 10 knots or less. a chance of showers. 
.sunday...west winds 5 to 10 knots becoming north. partly cloudy.
.monday...northeast winds 5 to 10 knots becoming southeast.
partly cloudy. 

winds and waves higher in and near thunderstorms.

$$