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open lake forecast for lake ontario
national weather service buffalo ny
1002 am est fri nov 21 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 29.2 inch surface low near james bay will swing a cold 
front across the lake this afternoon, with a 30.1 inch high building 
over the ohio valley and lower great lakes saturday. a 29.5 inch low 
will then move from northern ontario to james bay sunday, sending 
its cold front across the lake through the afternoon hours. a 30.2 
inch high is then forecast to build across the ohio valley monday. 
on tuesday a 29.5 inch low to the north of lake superior will swing 
a cold front across the lake by tuesday night.


loz064-065-212200-
lake ontario open waters from sodus bay to the saint lawrence
river-
1002 am est fri nov 21 2025

.rest of today...southwest winds 15 to 25 knots becoming west. a
chance of showers late this morning. waves 4 to 7 feet. waves
occasionally around 9 feet. 
.tonight...west winds 15 to 20 knots becoming northwest 10 to
15 knots. waves 3 to 6 feet subsiding to 1 to 3 feet. 
.saturday...northwest winds 10 to 15 knots. waves 1 to 3 feet. 
.saturday night...northwest winds 5 to 10 knots becoming
southwest. waves 2 feet or less. 
.sunday...southwest winds 15 to 20 knots becoming northwest. a
chance of rain showers. waves 1 to 3 feet building to 3 to
6 feet. 
.monday...west winds 5 to 15 knots becoming southeast. waves 2 to
4 feet subsiding to 1 to 3 feet. 
.tuesday...southeast winds 15 to 20 knots becoming south.
showers. 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
1002 am est fri nov 21 2025


slz022-212200-
saint lawrence river from cape vincent to ogdensburg-
1002 am est fri nov 21 2025

.rest of today...southwest winds 5 to 15 knots becoming west.
rain showers likely late this morning, then a chance of rain
showers early this afternoon. 
.tonight...west winds 10 knots or less. partly cloudy. 
.saturday...northwest winds 10 knots or less. mostly sunny. 
.saturday night...northwest winds less than 10 knots. partly
cloudy in the evening, then becoming mostly cloudy. 
.sunday...south winds 10 knots or less becoming west. a chance of
rain and snow showers during the day, then a chance of rain
showers sunday night. 
.monday...west winds 10 knots or less becoming south. partly
cloudy, then becoming mostly cloudy. 
.tuesday...southeast winds 5 to 10 knots becoming south. rain
showers likely. 

$$