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open lake forecast for lake ontario
national weather service buffalo ny
401 am edt thu may 1 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 depart towards new england 
today. meanwhile a 29.5 inch low will track just north of the lake 
tonight and into central quebec on friday with its corresponding 
cold front crossing the lake early friday. this front will stall 
along the eastern seaboard through the weekend and into monday with 
several weak waves upon it. to the north a 30.4 inch area of surface 
high pressure will slowly eases its way from the upper great lakes 
to quebec.


loz063>065-011500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
401 am edt thu may 1 2025

.today...east winds 5 to 15 knots increasing to 15 to 20 knots.
showers with thunderstorms likely late. some thunderstorms may
produce gusty winds late. waves 1 foot or less building to 2 to
4 feet. 
.tonight...east winds 15 to 20 knots becoming south. showers with
thunderstorms likely in the evening, then showers likely after
midnight. some thunderstorms may produce gusty winds in the
evening. waves 2 to 4 feet. 
.friday...south winds 15 to 20 knots becoming west. a chance of
showers. waves 2 to 4 feet building to 3 to 5 feet. 
.friday night...west winds 5 to 15 knots becoming northwest. a
chance of showers. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.saturday...northwest winds 5 to 10 knots. showers likely during
the day, then a chance of showers saturday night. waves 2 feet or
less. 
.sunday...north winds 5 to 15 knots becoming northeast. waves
1 to 3 feet. 
.monday...northeast winds 15 to 20 knots becoming southeast 10 to
15 knots. a chance of showers. waves 2 to 4 feet subsiding 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
401 am edt thu may 1 2025


slz022-024-011500-
saint lawrence river from cape vincent to saint regis
401 am edt thu may 1 2025

.today...light and variable winds becoming northeast 5 to
10 knots. a chance of rain showers late. 
.tonight...northeast winds 5 to 15 knots becoming south. showers
in the evening, then showers likely after midnight. 
.friday...south winds 10 to 15 knots becoming southwest 15 to
20 knots. a chance of showers. 
.friday night...southwest winds 5 to 15 knots becoming west less
than 10 knots. a chance of showers. 
.saturday...northwest winds less than 10 knots. showers likely
during the day, then a chance of showers saturday night. 
.sunday...north winds 5 to 10 knots becoming northeast. partly to
mostly cloudy. 
.monday...northeast winds 10 knots or less becoming southeast. a
chance of rain showers. 

$$