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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 am edt tue may 12 2026


slz022-024-122100-
saint lawrence river from cape vincent to saint regis
1002 am edt tue may 12 2026

.this afternoon...northwest winds 10 knots or less becoming west.
sunny.
.tonight...southwest winds 5 to 10 knots becoming southeast. a
chance of showers late. 
.wednesday...southeast winds 5 to 15 knots becoming south.
showers.
.wednesday night...south winds 10 knots or less. showers.
.thursday...southwest winds less than 10 knots becoming north.
showers.
.friday...north winds 10 knots or less becoming southwest. partly
to mostly cloudy. 
.saturday...southwest winds 5 to 15 knots. a chance of showers. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt tue may 12 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 30.3 inch high over the lower great lakes today will 
drift to the eastern seaboard through tonight. a 29.7 inch low over 
the central great lakes tonight will move to near the north shore of 
lake ontario by wednesday evening, then weaken into a trough over 
eastern new york and new england thursday. a 30.1 inch high will 
then build from the central great lakes and ohio valley thursday 
night to the lower great lakes and mid atlantic friday, then off the 
carolina coast saturday.


loz063>065-122100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt tue may 12 2026

.this afternoon...northwest winds 10 knots or less becoming
northeast. waves 1 foot or less. 
.tonight...east winds 5 to 15 knots becoming southeast 15 to
20 knots. a chance of showers. showers late. waves 1 to 3 feet. 
.wednesday...southeast winds 15 to 25 knots becoming south.
showers. waves 3 to 6 feet subsiding to 2 to 4 feet. 
.wednesday night...southwest winds 5 to 15 knots becoming west.
showers in the evening, then a chance of showers overnight. waves
1 to 3 feet. 
.thursday...west winds 5 to 10 knots becoming northwest. a chance
of showers during the day. waves 2 feet or less. 
.friday...northwest winds 5 to 10 knots becoming southwest. waves
2 feet or less. 
.saturday...south winds 10 to 15 knots becoming west. waves 1 to
3 feet. 

$$