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open lake forecast for lake ontario
national weather service buffalo ny
1002 am est wed dec 24 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 30.3 inch surface high over the lake this afternoon will slide to 
the mid-atlantic coast this evening. a weak surface low moves 
across southern quebec christmas day, with its cold front dropping 
southward across the lake. with the passage of this front, a strong 
30.6 inch sfc high over ontario will slide over the lake thursday 
night and then linger just to the east of the lake friday. a compact 
29.6 inch surface low will slide well south of the lake across ohio 
and southern pennsylvania friday night into saturday. another 29.5 
inch surface low will pass by to the northeast of the lake sunday.


loz064-065-242200-
lake ontario open waters from sodus bay to the saint lawrence
river-
1002 am est wed dec 24 2025

.this afternoon...northwest winds 15 to 20 knots diminishing to
5 to 15 knots. waves 4 to 7 feet subsiding to 1 to 3 feet. waves
occasionally around 9 feet. 
.tonight...west winds 5 to 15 knots becoming south. waves 2 feet
or less. 
.thursday...southwest winds 10 to 15 knots becoming north and
increasing to 15 to 25 knots. waves 1 to 2 feet building to 3 to
6 feet. 
.thursday night...north winds 15 to 25 knots becoming northeast.
waves 3 to 6 feet subsiding to 2 to 4 feet. 
.friday...east winds 10 to 15 knots becoming southeast 15 to
20 knots. snow. waves 1 to 3 feet building to 3 to 5 feet. 
.saturday...southeast winds 15 to 20 knots diminishing to 10 to
15 knots. snow likely during the day. waves 2 to 4 feet subsiding
to 1 to 3 feet. 
.sunday...southeast winds 15 to 20 knots becoming west and
increasing to 40 knot gales. rain during the day, then rain and
snow sunday night. waves 2 to 4 feet building to 16 to 21 feet.
waves occasionally around 27 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 am est wed dec 24 2025


slz022-242200-
saint lawrence river from cape vincent to ogdensburg-
1002 am est wed dec 24 2025

.this afternoon...northwest winds 10 knots or less becoming west.
partly to mostly sunny. 
.tonight...light and variable winds becoming southwest 5 to
10 knots. a chance of snow showers from late evening on. 
.thursday...west winds 10 knots or less becoming north. a chance
of snow showers in the morning. 
.thursday night...north winds 5 to 10 knots becoming northeast.
partly cloudy. 
.friday...northeast winds 5 to 10 knots. a chance of snow during
the day, then snow likely friday night. 
.saturday...northeast winds 10 knots or less becoming east. snow
likely during the day. 
.sunday...east winds 5 to 15 knots becoming west. snow and rain. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 am est wed dec 24 2025


slz024-242200-
saint lawrence river from ogdensburg to saint regis-
1002 am est wed dec 24 2025

.this afternoon...northwest winds 10 knots or less becoming west.
partly sunny. 
.tonight...light and variable winds becoming southwest 5 to
10 knots. a chance of snow showers. 
.thursday...west winds 5 to 15 knots becoming northwest. a chance
of snow showers in the morning. 
.thursday night...northwest winds 10 knots or less becoming
north. partly cloudy. 
.friday...northeast winds 10 knots or less increasing to 10 to
15 knots. snow likely friday night. 
.saturday...northeast winds 10 knots or less. snow likely during
the day. 
.sunday...east winds 10 knots or less becoming southwest and
increasing to 15 to 20 knots. snow likely with a chance of
freezing rain during the day, then snow sunday night. 

$$