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open lake forecast for lake ontario
national weather service buffalo ny
1001 am edt fri apr 18 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 29.5 inch low over wisconsin today will advance to 
just north of the waters saturday, with its advancing cold front 
moving across the lake tonight through saturday. this boundary will 
then stall out to the south of the lake sunday, meanwhile a 30.4 
inch high will build across lake superior. a 29.5 inch low is then 
forecast to track from missouri reaching the central great lakes 
monday, then pass to the north the lake. a 30.2 inch high will then 
build into the lake beginning tuesday.


loz063>065-182100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1001 am edt fri apr 18 2025

.this afternoon...southeast winds 15 to 20 knots becoming south. a
chance of showers. waves 1 to 3 feet. 
.tonight...south winds 10 to 15 knots becoming southwest 15 to
20 knots. a chance of showers early, then showers likely. showers
with a chance of thunderstorms late. waves 1 to 3 feet building
to 2 to 4 feet. 
.saturday...southwest winds 15 to 20 knots becoming west. showers
likely with a chance of thunderstorms in the morning, then
showers likely in the afternoon. waves 3 to 5 feet. 
.saturday night...west winds 15 to 20 knots becoming northwest. a
chance of rain showers in the evening. waves 3 to 6 feet. 
.sunday...northwest winds 15 to 20 knots becoming southeast 5 to
15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.monday...east winds 10 to 15 knots becoming southwest 15 to
20 knots. rain showers likely. waves 1 to 3 feet building to 3 to
6 feet. 
.tuesday...southwest winds 15 to 20 knots becoming west 10 to
15 knots. a chance of showers during the day. waves 3 to 6 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 am edt fri apr 18 2025


slz022-182100-
saint lawrence river from cape vincent to ogdensburg-
1001 am edt fri apr 18 2025

.this afternoon...south winds 5 to 15 knots. a chance of showers
early. showers likely late. 
.tonight...southwest winds 5 to 15 knots. showers with a chance
of thunderstorms. 
.saturday...southwest winds 10 to 15 knots. showers with a chance
of thunderstorms in the morning, then showers likely in the
afternoon. 
.saturday night...west winds 5 to 15 knots becoming northwest. a
chance of rain showers in the evening. 
.sunday...northwest winds 10 knots or less becoming northeast.
mainly clear, then becoming partly cloudy. 
.monday...east winds 10 knots or less becoming south 10 to
15 knots. a chance of rain showers during the day, then rain
showers likely monday night. 
.tuesday...southwest winds 5 to 15 knots becoming west. a chance
of rain 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 am edt fri apr 18 2025


slz024-182100-
saint lawrence river from ogdensburg to saint regis-
1001 am edt fri apr 18 2025

.this afternoon...south winds 5 to 10 knots. a chance of showers
early. showers likely late. 
.tonight...southwest winds 10 to 15 knots. showers with a chance
of thunderstorms. 
.saturday...southwest winds 10 to 15 knots. showers with a chance
of thunderstorms in the morning, then showers likely in the
afternoon. 
.saturday night...west winds 10 to 15 knots. a chance of rain
showers in the evening. 
.sunday...northwest winds 10 to 15 knots becoming light and
variable. mainly clear, then becoming partly cloudy. 
.monday...east winds 10 knots or less becoming south. a chance of
rain showers during the day, then rain showers likely monday
night. 
.tuesday...southwest winds 5 to 15 knots becoming west. a chance
of rain showers. 

winds and waves higher in and near thunderstorms.

$$