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open lake forecast for lake ontario
national weather service buffalo ny
1001 am edt wed may 21 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 drift into the lower great lakes 
today, while a secondary 29.6 inch low develops along the mid 
atlantic coast. the coastal low will slide northeast to off the new 
england coast by friday morning, while deepening to 29.5 inches. the 
two areas of low pressure will consolidate into a 29.6 inch low near 
the maine coast friday, and only slowly wobble east, with a trough 
extending back west across the lake this weekend.


loz063>065-212100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1001 am edt wed may 21 2025

.rest of today...east winds 10 to 15 knots increasing to 15 to
20 knots. a chance of showers early this afternoon. occasional
rain late. waves 2 to 4 feet. 
.tonight...east winds 15 to 25 knots. rain. waves 3 to 6 feet. 
.thursday...east winds 15 to 20 knots. rain. waves 3 to 5 feet. 
.thursday night...east winds 15 to 20 knots diminishing to 10 to
15 knots. rain. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.friday...east winds 10 to 15 knots becoming northwest. rain
likely. waves 1 to 3 feet. 
.saturday...northwest winds 10 to 15 knots becoming west. a
chance of rain during the day, then a chance of showers saturday
night. waves 1 to 3 feet. 
.sunday...west winds 5 to 15 knots. waves 1 to 3 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1001 am edt wed may 21 2025


slz022-024-212100-
saint lawrence river from cape vincent to saint regis
1001 am edt wed may 21 2025

.this afternoon...east winds 5 to 10 knots. a chance of showers
late. 
.tonight...east winds 5 to 10 knots. a chance of showers early,
then occasional rain from late evening on. 
.thursday...east winds 5 to 10 knots. rain.
.thursday night...east winds 10 knots or less becoming northeast.
rain.
.friday...northeast winds 10 knots or less becoming northwest.
rain likely. 
.saturday...northwest winds 10 knots or less. showers likely. 
.sunday...northwest winds 10 knots or less becoming southwest. a
chance of showers. 

$$