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open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt fri sep 19 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 30.4 inch high will build southeast from central 
ontario this afternoon to new england by tomorrow night, then off 
the new england coast sunday. broad low pressure averaging 29.8 
inches will then push across the upper great lakes and into quebec 
monday and tuesday...while pushing a weak cold frontal boundary into 
the lower lakes region.


loz062-192100-
lake ontario open waters from the niagara river to hamlin beach-
1002 am edt fri sep 19 2025

.this afternoon...northeast winds 10 knots or less becoming
southeast. waves 2 feet or less. 
.tonight...east winds less than 10 knots increasing to 15 to
20 knots. waves 1 foot or less building to 3 to 5 feet. 
.saturday...east winds 15 to 20 knots. waves 3 to 5 feet. 
.saturday night...east winds 15 to 20 knots. waves 3 to 5 feet. 
.sunday...southeast winds 10 to 15 knots becoming south. showers
likely sunday night. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.monday...southwest winds 10 to 15 knots. showers likely during
the day, then a chance of showers monday night. waves 1 to
3 feet. 
.tuesday...west winds 5 to 10 knots becoming north. a chance of
showers. waves 2 feet or less. 

$$

fzus61 kbuf 191402
glflo 
expires:202509192100;;252373

open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt fri sep 19 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 30.4 inch high will build southeast from central 
ontario this afternoon to new england by tomorrow night, then off 
the new england coast sunday. broad low pressure averaging 29.8 
inches will then push across the upper great lakes and into quebec 
monday and tuesday...while pushing a weak cold frontal boundary into 
the lower lakes region.


loz063>065-192100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt fri sep 19 2025

.this afternoon...north winds 5 to 10 knots becoming northwest.
waves 1 to 3 feet subsiding to 1 foot or less. 
.tonight...north winds 5 to 15 knots becoming northeast 15 to
20 knots. waves 2 feet or less building to 3 to 5 feet. 
.saturday...east winds 15 to 20 knots becoming northeast 10 to
15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.saturday night...northeast winds 10 to 15 knots becoming
southeast 15 to 20 knots. waves 1 to 3 feet building to 2 to
4 feet. 
.sunday...southeast winds 15 to 20 knots becoming south. a chance
of showers sunday night. waves 2 to 4 feet building to 3 to
5 feet. 
.monday...south winds 15 to 20 knots becoming southwest 10 to
15 knots. a chance of showers during the day, then showers likely
monday night. waves 3 to 5 feet subsiding to 1 to 2 feet. 
.tuesday...southwest winds 5 to 10 knots becoming north. showers
likely during the day, then a chance of showers tuesday night.
waves 1 to 3 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 sep 19 2025


slz022-024-192100-
saint lawrence river from cape vincent to saint regis
1002 am edt fri sep 19 2025

.this afternoon...north winds 5 to 10 knots. sunny.
.tonight...north winds 10 knots or less becoming northeast.
mainly clear. 
.saturday...northeast winds 10 knots or less. sunny.
.saturday night...northeast winds less than 10 knots becoming
east. mainly clear in the evening, then becoming partly cloudy. 
.sunday...southeast winds 5 to 10 knots becoming south. a chance
of rain showers sunday night. 
.monday...south winds 10 knots or less becoming southwest. a
chance of showers. 
.tuesday...southwest winds 10 knots or less becoming north. a
chance of showers. 

$$