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open lake forecast for lake ontario
national weather service buffalo ny
1002 am 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 30.2 inch high will settle over the lower great lakes 
today, before sliding off the east coast saturday. meanwhile, a 
29.1 inch surface low will track across northwestern ontario into 
hudson bay tonight and saturday while pushing a warm front across 
the lake this afternoon through saturday morning. a developing 29.5 
inch low over the ohio valley saturday will strengthen to 29.3 
inches as it moves northeast along a stationary boundary through the 
central great lakes saturday night and sunday. another 29.5 inch low 
is then forecast to develop over the upper ohio valley sunday night, 
then move east across the lower great lakes into western new england 
by late monday, while pushing a cold front across the lake sunday 
night. brief ridging of 29.9 inches will then sweep across the lake 
tuesday.


loz063>065-172100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt fri oct 17 2025

.this afternoon...north winds 10 knots or less becoming northwest.
waves 1 foot or less. 
.tonight...west winds 10 knots or less becoming south. a chance
of showers. waves 1 foot or less. 
.saturday...south winds 10 to 15 knots becoming southeast. a
chance of showers. 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 to 30 knots becoming south. showers.
waves 5 to 8 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. waves 10 to 13 feet subsiding to 4 to 7 feet.
waves occasionally around 16 feet. 
.tuesday...southwest winds 15 to 25 knots becoming west to
30 knots. showers. waves 3 to 5 feet building to 6 to 10 feet.
waves occasionally around 13 feet. 

$$

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


slz022-024-172100-
saint lawrence river from cape vincent to saint regis
1002 am edt fri oct 17 2025

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

$$