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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt sat jul 12 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 29.7 inch low north of lake huron will make its way to 
james bay overnight while deepening to 29.3 inches. the low will 
then lift north across hudson bay and into northern quebec sunday... 
while slowly dragging its trailing cold front across the lake late 
sunday and sunday night. a 30.1 inch high will slowly drift from the 
upper midwest to new england monday through wednesday...then a 29.7 
inch low will track northeastward across the great lakes and into 
quebec wednesday night and thursday.


loz063>065-130900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt sat jul 12 2025

.overnight...southeast winds 5 to 15 knots becoming south.
a chance of showers and thunderstorms late. waves 1 to 3 feet. 
.sunday...south winds 5 to 15 knots becoming southwest. a chance
of showers and thunderstorms in the morning, then showers with a
chance of thunderstorms in the afternoon. waves 1 to 3 feet
subsiding to 1 foot or less. 
.sunday night...south winds 5 to 10 knots becoming west. a chance
of showers and thunderstorms in the evening, then a chance of
showers overnight. waves 1 foot or less. 
.monday...west winds 10 knots or less becoming southwest. waves
1 foot or less. 
.monday night...southwest winds 5 to 10 knots. waves 1 foot or
less. 
.tuesday...southwest winds 10 knots or less becoming south. waves
1 foot or less. 
.wednesday...south winds 5 to 10 knots. a chance of showers
wednesday night. waves 2 feet or less. 
.thursday...southwest winds 5 to 10 knots becoming west. showers
likely with a chance of thunderstorms. waves 1 to 2 feet. 

winds and waves higher in and near thunderstorms.

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 pm edt sat jul 12 2025


slz022-024-130900-
saint lawrence river from cape vincent to saint regis
1002 pm edt sat jul 12 2025

.rest of tonight...south winds 10 knots or less. mainly clear
late this evening, then becoming partly cloudy. 
.sunday...south winds 5 to 10 knots becoming southwest. a chance
of showers and thunderstorms in the morning, then showers with
thunderstorms likely in the afternoon. 
.sunday night...southwest winds 10 knots or less. showers and
thunderstorms likely in the evening, then showers likely
overnight. 
.monday...west winds 10 knots or less becoming southwest. a
chance of showers in the morning. 
.monday night...southwest winds 10 knots or less. clear.
.tuesday...southwest winds 10 knots or less becoming south.
mainly clear. 
.wednesday...southwest winds 10 knots or less becoming south. a
chance of showers. 
.thursday...south winds 5 to 10 knots becoming west. showers
likely. 

winds and waves higher in and near thunderstorms.

$$