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open lake forecast for lake ontario
national weather service buffalo ny
1001 pm edt sun apr 20 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 30.4 inch high will build across the lower great lakes 
tonight before drifting east to new england monday. a 29.5 inch low 
will move into the central great lakes monday before reaching quebec 
tuesday, with the trailing cold front crossing the lake monday 
night. a general area of high pressure averaging 30.3 inches will 
then build from the upper great lakes tuesday to the lower great 
lakes and western quebec wednesday before settling into new england 
thursday.


loz063>065-210900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1001 pm edt sun apr 20 2025

.overnight...southeast winds 5 to 10 knots becoming east
and increasing to 15 to 20 knots. waves 1 foot or less building
to 1 to 3 feet. 
.monday...east winds 15 to 20 knots becoming southeast. a chance
of rain showers early, then rain showers late in the morning.
rain showers with a chance of thunderstorms in the afternoon.
waves 3 to 5 feet. 
.monday night...south winds 15 to 25 knots becoming southwest.
showers with a chance of thunderstorms in the evening, then
showers likely overnight. waves 2 to 4 feet building to 3 to
5 feet. 
.tuesday...southwest winds 15 to 25 knots becoming west. waves
3 to 6 feet building to 4 to 7 feet. waves occasionally around
9 feet. 
.tuesday night...west winds 15 to 20 knots diminishing to 10 to
15 knots. waves 4 to 7 feet subsiding to 1 to 3 feet. waves
occasionally around 9 feet. 
.wednesday...west winds 5 to 10 knots becoming southeast. waves
1 to 3 feet subsiding to 1 foot or less. 
.thursday...east winds 5 to 10 knots becoming southeast. waves
2 feet or less. 
.friday...southeast winds 10 to 15 knots becoming west. a chance
of showers. waves 1 to 2 feet building to 2 to 4 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 sun apr 20 2025


slz022-210900-
saint lawrence river from cape vincent to ogdensburg-
1001 pm edt sun apr 20 2025

.rest of tonight...light and variable winds. partly cloudy. 
.monday...east winds 10 knots or less becoming southeast. a
chance of rain showers late in the morning. rain showers with a
chance of thunderstorms in the afternoon. 
.monday night...southeast winds 5 to 10 knots becoming southwest
and increasing to 15 to 20 knots. showers with a chance of
thunderstorms in the evening, then showers likely overnight. 
.tuesday...southwest winds 15 to 20 knots. mostly cloudy in the
morning, then becoming partly sunny. 
.tuesday night...west winds 5 to 15 knots diminishing to less
than 10 knots. partly to mostly cloudy. 
.wednesday...west winds less than 10 knots becoming south. partly
cloudy. 
.thursday...south winds less than 10 knots becoming southeast.
partly to mostly cloudy. 
.friday...southeast winds 5 to 10 knots becoming west. a chance
of showers. 

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 sun apr 20 2025


slz024-210900-
saint lawrence river from ogdensburg to saint regis-
1001 pm edt sun apr 20 2025

.rest of tonight...north winds less than 10 knots. mainly clear
late this evening, then becoming partly cloudy. 
.monday...east winds 10 knots or less. a chance of rain showers
early in the afternoon. rain showers likely late. 
.monday night...east winds 10 knots or less becoming southwest
10 to 15 knots. showers with a chance of thunderstorms in the
evening, then showers likely overnight. 
.tuesday...southwest winds 10 to 15 knots. mostly cloudy. 
.tuesday night...west winds 5 to 15 knots. mostly cloudy. 
.wednesday...west winds 5 to 10 knots becoming light and
variable. partly to mostly cloudy. 
.thursday...southwest winds 10 knots or less becoming southeast.
partly to mostly cloudy. 
.friday...east winds 10 knots or less becoming west. a chance of
showers. 

winds and waves higher in and near thunderstorms.

$$