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open lake forecast for lake ontario
national weather service buffalo ny
124 pm edt tue jun 30 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 warm front will cross the lake today, then a 30.1 inch 
high will build into the ohio valley and mid atlantic by wednesday, 
where it will remain through at least thursday. a weak 29.9 inch 
trough will then approach and cross the lake friday into saturday.


loz063>065-302115-
lake ontario open waters from hamlin beach to the saint lawrence
river-
124 pm edt tue jun 30 2026

...severe thunderstorm watch 423 in effect until 8 pm edt this
evening...

.this afternoon...south winds 5 to 10 knots. a chance of showers
and thunderstorms. some thunderstorms may be severe with strong
winds and large hail. waves 1 foot or less. 
.tonight...south winds 5 to 10 knots becoming southwest. waves
2 feet or less. 
.wednesday...southwest winds 5 to 15 knots becoming west. waves
1 to 2 feet. 
.wednesday night...southwest winds 5 to 15 knots. a chance of
showers and thunderstorms in the evening. waves 1 to 3 feet. 
.thursday...southwest winds 10 to 15 knots becoming west. waves
1 to 3 feet. 
.friday...west winds 5 to 15 knots. a chance of showers and
thunderstorms friday night. waves 1 to 2 feet. 
.saturday...west winds 10 knots or less becoming north. a chance
of showers and thunderstorms. waves 1 foot 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
124 pm edt tue jun 30 2026


slz022-024-302115-
saint lawrence river from cape vincent to saint regis
124 pm edt tue jun 30 2026

...severe thunderstorm watch 423 in effect until 8 pm edt this
evening...

.this afternoon...southwest winds 5 to 15 knots. showers likely
with a chance of thunderstorms. some thunderstorms may be severe
with strong winds and large hail. 
.tonight...southwest winds 5 to 10 knots. a chance of showers and
thunderstorms early. a chance of showers late. some thunderstorms
may be severe with strong winds and large hail early. 
.wednesday...southwest winds 5 to 10 knots. a chance of showers
in the morning. 
.wednesday night...southwest winds 10 knots or less. partly
cloudy. 
.thursday...southwest winds 5 to 15 knots. showers likely with a
chance of thunderstorms. 
.friday...southwest winds 10 knots or less. a chance of showers. 
.saturday...west winds less than 10 knots. a chance of showers
and thunderstorms. 

winds and waves higher in and near thunderstorms.

$$