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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt fri jul 11 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 29.6 inch low will lift across the upper great lakes 
tonight, then into northwest ontario on saturday, before reaching 
james bay on sunday while also deepening to 29.2 inches. in the 
process, the system will push a warm front across the lake saturday 
night, followed by a slow-moving trailing cold front later sunday 
into sunday night. a 30.1 inch high over the ohio valley will then 
build across the lower great lakes monday through wednesday.


loz063>065-120900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt fri jul 11 2025

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

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 fri jul 11 2025


slz022-024-120900-
saint lawrence river from cape vincent to saint regis
1002 pm edt fri jul 11 2025

.overnight...light and variable winds. patchy fog late. 
.saturday...light and variable winds. patchy fog early. a chance
of showers and thunderstorms in the afternoon. 
.saturday night...south winds 10 knots or less. a chance of
showers and thunderstorms in the evening, then a chance of
showers overnight. 
.sunday...south winds 5 to 10 knots becoming southwest. showers
likely with a chance of thunderstorms in the morning, then
showers with thunderstorms likely in the afternoon. 
.sunday night...southwest winds 10 knots or less. showers with a
chance of thunderstorms in the evening, then a chance of showers
and thunderstorms overnight. 
.monday...southwest winds 10 knots or less. becoming mainly
clear. 
.tuesday...southwest winds 10 knots or less becoming south.
mainly clear, then becoming partly cloudy. 
.wednesday...south winds 10 knots or less becoming southwest. a
chance of showers wednesday night. 

winds and waves higher in and near thunderstorms.

$$