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open lake forecast for lake ontario
national weather service buffalo ny
402 pm 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 evening, 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. the surface low will 
then track well north of the lake through wednesday.


loz062-220400-
lake ontario open waters from the niagara river to hamlin beach-
402 pm est fri nov 21 2025

.tonight...northwest winds 10 to 15 knots. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.saturday...northwest winds 5 to 15 knots becoming west. waves
2 feet or less. 
.saturday night...northwest winds 5 to 15 knots becoming
southwest. waves 2 feet or less. 
.sunday...southwest winds 15 to 25 knots becoming west. a chance
of rain. waves 1 to 3 feet building to 4 to 6 feet. 
.sunday night...west winds 15 to 20 knots diminishing to 10 to
15 knots. waves 3 to 6 feet subsiding to 2 to 4 feet. 
.monday...west winds 5 to 10 knots becoming southeast. waves 1 to
3 feet subsiding to 1 foot or less. 
.tuesday...southeast winds 10 to 15 knots becoming southwest.
rain. waves 1 to 3 feet. 
.wednesday...southwest winds 15 to 20 knots becoming west and
increasing to 30 knots. a chance of rain showers during the day,
then a chance of rain and snow showers wednesday night. waves
3 to 5 feet building to 8 to 11 feet. waves occasionally around
14 feet. 

$$

fzus61 kbuf 212102
glflo 
expires:202511220400;;270598

open lake forecast for lake ontario
national weather service buffalo ny
402 pm 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 evening, 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. the surface low will 
then track well north of the lake through wednesday.


loz063-220400-
lake ontario open waters from hamlin beach to sodus bay-
402 pm est fri nov 21 2025

.tonight...northwest winds 15 to 20 knots diminishing to 10 to
15 knots. waves 3 to 6 feet subsiding to 2 to 3 feet. 
.saturday...northwest winds 10 to 15 knots. waves 1 to 3 feet. 
.saturday night...northwest winds 5 to 15 knots becoming
southwest. waves 1 to 2 feet. 
.sunday...southwest winds 15 to 25 knots becoming west. a chance
of rain. waves 1 to 3 feet building to 5 to 8 feet. waves
occasionally around 10 feet. 
.sunday night...west winds 15 to 25 knots becoming northwest. a
chance of rain in the evening. waves 5 to 8 feet subsiding to
3 to 5 feet. waves occasionally around 10 feet. 
.monday...west winds 5 to 15 knots becoming south. waves 2 to
4 feet subsiding to 1 to 3 feet. 
.tuesday...southeast winds 10 to 15 knots becoming south. rain.
waves 1 to 3 feet. 
.wednesday...southwest winds 15 to 25 knots becoming west to
30 knots. rain showers likely during the day, then a chance of
rain and snow showers wednesday night. waves 2 to 4 feet building
to 10 to 13 feet. waves occasionally around 16 feet. 

$$

fzus61 kbuf 212102
glflo 
expires:202511220400;;270599

open lake forecast for lake ontario
national weather service buffalo ny
402 pm 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 evening, 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. the surface low will 
then track well north of the lake through wednesday.


loz064-065-220400-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 pm est fri nov 21 2025

.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 25 knots becoming west. rain
likely. waves 1 to 3 feet building to 5 to 8 feet. waves
occasionally around 10 feet. 
.sunday night...west winds 15 to 25 knots becoming northwest.
rain likely in the evening, then a chance of rain overnight.
waves 5 to 8 feet subsiding to 3 to 5 feet. waves occasionally
around 10 feet. 
.monday...northwest winds 5 to 15 knots becoming south. waves
2 to 4 feet subsiding to 1 to 3 feet. 
.tuesday...southeast winds 15 to 20 knots becoming south. rain.
waves 1 to 3 feet building to 2 to 4 feet, then subsiding to 1 to
3 feet. 
.wednesday...southwest winds 15 to 20 knots becoming west and
increasing to 30 knots. rain showers likely during the day, then
rain and snow showers likely wednesday night. waves 3 to 5 feet
building to 9 to 13 feet. waves occasionally around 16 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est fri nov 21 2025


slz022-220400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est fri nov 21 2025

.tonight...west winds 10 knots or less. partly cloudy. 
.saturday...northwest winds 10 knots or less. partly sunny. 
.saturday night...northwest winds less than 10 knots. partly
cloudy in the evening, then becoming mostly cloudy. 
.sunday...south winds 5 to 10 knots becoming southwest. snow and
rain. 
.sunday night...west winds 10 knots or less. rain likely in the
evening, then a chance of rain overnight. 
.monday...west winds 10 knots or less becoming south. partly to
mostly cloudy. 
.tuesday...south winds 5 to 10 knots. rain.
.wednesday...south winds 5 to 15 knots becoming southwest. rain
showers likely. 

$$