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open lake forecast for lake ontario
national weather service buffalo ny
1003 am edt mon oct 19 2026

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 ridge averaging 30.3 inches will be overhead of the 
lake through friday. one embedded high pressure center will weaken 
over atlantic canada today, while another embedded and reinforcing 
high pressure center will move from near the border of the north-
central united states and canada to near the canadian maritimes 
through wednesday. a third embedded and reinforcing high pressure 
center will wobble eastward from the canadian prairies to northern 
ontario this wednesday through thursday and then wobble 
southeastward to southern ontario this thursday night through friday.


loz063>065-192100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1003 am edt mon oct 19 2026

.this afternoon...southwest winds 5 to 15 knots becoming west.
waves 1 to 3 feet. 
.tonight...west winds 5 to 10 knots becoming northeast and
increasing to 15 to 20 knots. waves 1 to 3 feet. 
.tuesday...northeast winds 15 to 20 knots diminishing to 10 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tuesday night...northeast winds 10 to 15 knots. waves 1 to
3 feet. 
.wednesday...northeast winds 10 knots or less becoming northwest.
waves 2 feet or less. 
.thursday...north winds 5 to 10 knots becoming northeast and
increasing to 15 to 20 knots. waves 1 foot or less building to
2 to 4 feet. 
.friday...northeast winds 15 to 20 knots becoming southeast 5 to
15 knots. waves 2 to 4 feet subsiding to 1 foot or less. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 am edt mon oct 19 2026


slz022-024-192100-
saint lawrence river from cape vincent to saint regis
1003 am edt mon oct 19 2026

.this afternoon...southwest winds 5 to 10 knots. sunny.
.tonight...southwest winds 10 knots or less becoming north.
mainly clear through the early overnight, then becoming partly
cloudy. 
.tuesday...north winds 5 to 10 knots becoming northeast. sunny.
.tuesday night...northeast winds 10 knots or less. mainly clear. 
.wednesday...northeast winds less than 10 knots. mainly clear. 
.thursday...light and variable winds becoming north 5 to
10 knots. becoming mainly clear. 
.friday...north winds 5 to 10 knots becoming light and variable.
mainly clear. 

$$