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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt fri jul 3 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 30.1 inch high will remain in place today from the 
upper ohio valley to the mid atlantic. a weak cold front will settle 
south across the lake this evening, followed by another weak cold 
front saturday evening. a 30.2 inch high will then build from hudson 
bay saturday to quebec and northern new england sunday night. a weak 
29.9 inch low will then develop over the upper ohio valley late 
sunday and move to the mid atlantic by late monday. a broad 30.1 
inch high is then forecast to build into the great lakes tuesday 
through wednesday.


loz063>065-031500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt fri jul 3 2026

.today...west winds 5 to 15 knots. a chance of showers and
thunderstorms early this afternoon. showers and thunderstorms
likely late. some thunderstorms may produce gusty winds late.
waves 1 to 2 feet. 
.tonight...west winds 5 to 10 knots. showers and thunderstorms
likely early. a chance of showers after midnight. some
thunderstorms may produce gusty winds early. waves 1 to 2 feet. 
.saturday...west winds 5 to 10 knots. a chance of showers. waves
2 feet or less. 
.saturday night...west winds 10 knots or less becoming east.
waves 1 foot or less. 
.sunday...east winds 5 to 10 knots. a chance of showers sunday
night. waves 2 feet or less. 
.monday...southeast winds 5 to 10 knots becoming east. showers
likely with a chance of thunderstorms. waves 2 feet or less. 
.tuesday...east winds 10 knots or less becoming southwest. a
chance of showers. 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
402 am edt fri jul 3 2026


slz022-024-031500-
saint lawrence river from cape vincent to saint regis
402 am edt fri jul 3 2026

.today...southwest winds 10 knots or less. a chance of showers
and thunderstorms this afternoon. some thunderstorms may produce
gusty winds late. 
.tonight...southwest winds 10 knots or less becoming west. a
chance of showers and thunderstorms early. some thunderstorms may
produce gusty winds early. 
.saturday...northwest winds 10 knots or less. becoming mostly
sunny. 
.saturday night...northwest winds less than 10 knots. mainly
clear in the evening, then becoming partly cloudy. 
.sunday...north winds less than 10 knots becoming east. partly to
mostly cloudy. 
.monday...east winds less than 10 knots. a chance of showers. 
.tuesday...east winds less than 10 knots. a chance of showers
during the day. 

winds and waves higher in and near thunderstorms.

$$