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open lake forecast for lake ontario
national weather service buffalo ny
402 am est tue nov 4 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 over the mississippi valley will 
advance eastward across the ohio valley and mid-atlantic states 
tuesday. an area of low pressure will pass to the west and north of 
the lake wednesday, deepening from 29.8 inches down to 29.4 inches 
through the day. following this low, another 30.3 inch surface high 
will reestablish over the lake for thursday. the surface high will 
then track east off the atlantic coast through friday allowing for 
another cold frontal passage. a 29.4 inch low near james bay will 
drag its cold front across the lake friday night into saturday.


loz063>065-041600-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am est tue nov 4 2025

...gale watch in effect from wednesday morning through late
wednesday night...

.today...northwest winds to 30 knots becoming west. waves 9 to
12 feet subsiding to 7 to 11 feet. waves occasionally around
15 feet. 
.tonight...west winds 15 to 20 knots becoming southwest 10 to
15 knots. a chance of showers late. waves 5 to 8 feet subsiding
to 1 to 3 feet. waves occasionally around 10 feet. 
.wednesday...south winds 10 to 15 knots becoming southwest and
increasing to 35 knot gales in the afternoon. a chance of showers
in the morning, then showers in the afternoon. waves 1 to 3 feet
building to 10 to 13 feet. waves occasionally around 16 feet. 
.wednesday night...west gales to 40 knots becoming northwest and
diminishing to 30 knots overnight. showers. waves 14 to 18 feet
subsiding to 8 to 11 feet. waves occasionally around 23 feet. 
.thursday...northwest winds 15 to 25 knots becoming south 15 to
20 knots. rain showers likely during the day. waves 6 to 9 feet
subsiding to 1 to 3 feet. waves occasionally around 11 feet. 
.friday...south winds to 30 knots becoming west. showers. waves
3 to 6 feet building to 5 to 8 feet. waves occasionally around
10 feet. 
.saturday...northwest winds 15 to 20 knots becoming east 5 to
15 knots. showers. waves 3 to 6 feet subsiding to 1 to 3 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am est tue nov 4 2025


slz022-024-041600-
saint lawrence river from cape vincent to saint regis
402 am est tue nov 4 2025

.today...west winds 10 to 15 knots. sunny.
.tonight...west winds 10 knots or less becoming southwest. mainly
clear early, then becoming mostly cloudy. 
.wednesday...south winds 10 knots or less becoming east 10 to
15 knots. rain showers. 
.wednesday night...north winds 15 to 20 knots becoming northwest
10 to 15 knots. rain showers in the evening, then rain showers
with a chance of snow showers overnight. 
.thursday...northwest winds 10 knots or less becoming south.
partly cloudy. 
.friday...south winds 10 to 15 knots becoming southwest. rain
showers likely during the day, then rain showers friday night. 
.saturday...northwest winds 10 knots or less becoming northeast.
rain showers during the day, then a chance of rain showers, snow
showers and freezing rain saturday night. 

$$