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open lake forecast for lake ontario
national weather service buffalo ny
403 pm edt wed apr 22 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 30.0 inch high will build across the great lakes 
tonight and tomorrow. a warm front will approach the lake friday, 
this from a 29.6 inch area of low pressure that will advance across 
the great lakes region, though remaining south of the lake. this low 
will move towards delmarva saturday. a 30.2 inch area of high 
pressure will build across the lower great lakes saturday night and 
sunday. a 29.4 inch area of low pressure will advance from the 
central plains sunday night to the western great lakes monday night.


loz063>065-230300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
404 pm edt wed apr 22 2026

.tonight...northwest winds 5 to 10 knots. waves 1 foot or less. 
.thursday...north winds 5 to 10 knots becoming southwest. waves
1 foot or less. 
.thursday night...southwest winds 10 knots or less becoming
northeast 10 to 15 knots. waves 2 feet or less. 
.friday...northeast winds 5 to 15 knots. waves 2 feet or less. 
.friday night...northeast winds 5 to 15 knots becoming east. a
chance of showers overnight. waves 1 to 3 feet. 
.saturday...east winds 15 to 20 knots diminishing to 5 to
15 knots. a chance of showers. waves 2 to 4 feet subsiding to
1 to 3 feet. 
.sunday...north winds 10 knots or less becoming east. waves
1 foot or less. 
.monday...east winds 5 to 15 knots becoming southeast 15 to
20 knots. a chance of showers monday night. waves 1 to 3 feet
building to 2 to 4 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
404 pm edt wed apr 22 2026


slz022-024-230300-
saint lawrence river from cape vincent to saint regis
404 pm edt wed apr 22 2026

.tonight...northwest winds 10 knots or less becoming north.
mainly clear. 
.thursday...north winds 10 knots or less becoming northwest.
sunny.
.thursday night...north winds 10 knots or less. partly cloudy. 
.friday...north winds 10 knots or less becoming northeast. sunny.
.friday night...northeast winds less than 10 knots becoming east.
mainly clear. 
.saturday...east winds 5 to 10 knots becoming light and variable.
partly to mostly cloudy. 
.sunday...light and variable winds. partly cloudy. 
.monday...light and variable winds becoming southeast 5 to
10 knots. partly to mostly cloudy. 

$$