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open lake forecast for lake ontario
national weather service buffalo ny
652 pm 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 draped from the carolinas to new york 
state will settle off the mid-atlantic coast this evening. a 29.6 
inch low over the central great lakes tonight will move to a little 
north 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. a 29.2 inch low over the 
central plains will then push its warm front into the lower lakes 
region on sunday.


loz062-130315-
lake ontario open waters from the niagara river to hamlin beach-
652 pm edt tue may 12 2026

.tonight...east winds 5 to 10 knots becoming southeast and
increasing to 15 to 20 knots. a chance of showers early, then
showers from late evening on. waves 1 to 3 feet. 
.wednesday...south winds 15 to 20 knots becoming southwest.
showers early, then a chance of showers. waves 2 to 4 feet. 
.wednesday night...west winds 15 to 20 knots diminishing to 10 to
15 knots. waves 2 to 4 feet. 
.thursday...west winds 5 to 15 knots becoming northwest. waves
1 to 2 feet. 
.thursday night...northwest winds 5 to 10 knots. waves around
1 foot. 
.friday...west winds 5 to 15 knots becoming southwest. waves
2 feet or less. 
.saturday...southwest winds 15 to 20 knots becoming west 10 to
15 knots. waves 1 to 3 feet building to 2 to 4 feet, then
subsiding to 1 to 3 feet. 
.sunday...west winds 5 to 10 knots becoming east. waves 2 feet or
less. 

$$

fzus61 kbuf 122252
glflo 
expires:202605130315;;459168

open lake forecast for lake ontario
national weather service buffalo ny
652 pm 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 draped from the carolinas to new york 
state will settle off the mid-atlantic coast this evening. a 29.6 
inch low over the central great lakes tonight will move to a little 
north 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. a 29.2 inch low over the 
central plains will then push its warm front into the lower lakes 
region on sunday.


loz063>065-130315-
lake ontario open waters from hamlin beach to the saint lawrence
river-
652 pm edt tue may 12 2026

.tonight...east winds 5 to 15 knots becoming southeast 15 to
20 knots. showers from late evening on. waves 1 to 3 feet. 
.wednesday...southeast winds 15 to 25 knots becoming southwest.
showers in the morning, then showers likely in the afternoon.
waves 3 to 5 feet subsiding to 2 to 4 feet. 
.wednesday night...southwest winds 5 to 15 knots. a chance of
showers. waves 1 to 3 feet. 
.thursday...southwest winds 5 to 10 knots becoming northwest.
waves 2 feet or less. 
.thursday night...northwest winds 5 to 10 knots. 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. a chance of
showers. waves 1 to 3 feet building to 2 to 4 feet, then
subsiding to 1 to 3 feet. 
.sunday...west winds 5 to 15 knots becoming southeast. waves 1 to
3 feet subsiding to 1 foot or less. 

$$

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


slz022-024-130300-
saint lawrence river from cape vincent to saint regis
403 pm edt tue may 12 2026

.tonight...southwest winds 5 to 10 knots becoming southeast.
showers likely late. 
.wednesday...southeast winds 5 to 15 knots becoming south.
showers through early afternoon, then showers likely late. 
.wednesday night...south winds 10 knots or less becoming
southwest. showers.
.thursday...southwest winds less than 10 knots becoming
northwest. showers.
.thursday night...north winds less than 10 knots. a chance of
showers in the evening. 
.friday...north winds 10 knots or less becoming southwest. mostly
cloudy. 
.saturday...southwest winds 5 to 15 knots becoming west. a chance
of showers. 
.sunday...west winds 5 to 10 knots becoming light and variable.
partly cloudy. 

$$