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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt fri oct 17 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 30.0 inch high will slowly exit off to our east 
tonight and then off the eastern sea board saturday. a developing 
29.5 inch low over the ohio valley saturday will strengthen to 29.3 
inches, this as it moves northeast along a stationary boundary 
through sunday. another 29.5 inch low is then forecast to develop 
over the upper ohio valley sunday night, it then move east across 
the lower great lakes into western new england, all while pushing a 
cold front across the lakes. surface high pressure builds northeast 
across the ohio valley and the lower lakes on monday ahead of a 29.4 
inch low tracking across lake superior through tuesday. this low 
will weaken 29.6 inches and broaden as it heads east tuesday night 
into the day wednesday.


loz063>065-180900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt fri oct 17 2025

.overnight...south winds 5 to 15 knots. a chance of
showers. waves 1 foot or less. 
.saturday...south winds 10 to 15 knots becoming southeast. waves
1 to 3 feet. 
.saturday night...southeast winds 15 to 25 knots becoming south.
a chance of showers. waves 1 to 3 feet building to 3 to 6 feet. 
.sunday...southeast winds 15 to 25 knots increasing to 30 knots.
a chance of showers in the morning, then showers in the
afternoon. waves 5 to 8 feet. waves occasionally around 10 feet. 
.sunday night...south winds to 30 knots becoming southwest.
showers. waves 5 to 9 feet building to 7 to 10 feet. waves
occasionally around 13 feet. 
.monday...west winds to 30 knots becoming southwest 15 to
25 knots. showers during the day, then a chance of showers monday
night. waves 10 to 13 feet subsiding to 4 to 7 feet. waves
occasionally around 16 feet. 
.tuesday...south winds 15 to 25 knots becoming southwest to
30 knots. showers. waves 3 to 5 feet building to 6 to 10 feet.
waves occasionally around 13 feet. 
.wednesday...west winds to 30 knots diminishing to 15 to
25 knots. showers. waves 8 to 12 feet subsiding to 7 to 10 feet.
waves occasionally around 15 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 pm edt fri oct 17 2025


slz022-024-180900-
saint lawrence river from cape vincent to saint regis
1002 pm edt fri oct 17 2025

.overnight...southwest winds less than 10 knots becoming
south. a chance of rain showers. 
.saturday...south winds 10 knots or less. a chance of showers
late. 
.saturday night...southeast winds 5 to 15 knots. a chance of
showers overnight. 
.sunday...southeast winds 10 to 15 knots becoming south 15 to
20 knots. a chance of showers. 
.sunday night...south winds 15 to 20 knots diminishing to 10 to
15 knots. showers.
.monday...southwest winds 5 to 15 knots. showers.
.tuesday...south winds 5 to 10 knots becoming southwest. showers.
.wednesday...southwest winds 5 to 10 knots becoming west. rain
showers. 

$$