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open lake forecast for lake ontario
national weather service buffalo ny
644 am est wed dec 10 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 29.2 inch low will cross along the northern shoreline 
of the lake this afternoon before moving northeast of the lake this 
evening, while dragging a cold front across the lake waters. the 
region will then be situated between a 29.1 inch low over the 
canadian maritimes and a 30.1 inch high over the southern plains 
thursday. a 29.9 inch ridge of high pressure is expected to move 
into the great lakes region friday. a 29.8 inch low may move north 
of the lake on saturday, then 30.2 inches will average across the 
lower great lakes region between the departing low to the east and a 
30.7 inch high over the plains sunday.


loz064-065-101615-
lake ontario open waters from sodus bay to the saint lawrence
river-
644 am est wed dec 10 2025

...gale watch in effect from late tonight through thursday
evening...

.today...south winds to 30 knots becoming southwest. snow and
rain this morning, then rain this afternoon. waves 4 to 7 feet.
waves occasionally around 9 feet. 
.tonight...west winds to 30 knots becoming northwest and
increasing to 35 knot gales after midnight. rain early, then rain
and snow likely late in the evening. lake effect snow showers
likely after midnight. waves 5 to 9 feet building to 10 to
13 feet. waves occasionally around 16 feet. 
.thursday...west winds to 30 knots increasing to 35 knot gales.
snow showers likely. waves 10 to 14 feet. waves occasionally
around 18 feet. 
.thursday night...northwest gales to 35 knots diminishing to
30 knots. snow showers likely in the evening, then a chance of
snow showers overnight. waves 10 to 14 feet subsiding to 5 to
8 feet. waves occasionally around 18 feet. 
.friday...northwest winds 15 to 25 knots becoming southwest and
diminishing to 10 to 15 knots. lake effect snow showers likely.
waves 4 to 7 feet subsiding to 2 to 4 feet. waves occasionally
around 9 feet. 
.saturday...southwest winds 15 to 25 knots becoming west. snow
showers. waves 4 to 7 feet building to 8 to 11 feet, then
subsiding to 6 to 9 feet. waves occasionally around 14 feet. 
.sunday...west winds 15 to 25 knots becoming northwest. snow
showers likely during the day, then a chance of snow showers
sunday night. waves 5 to 8 feet subsiding to 3 to 6 feet. waves
occasionally around 10 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am est wed dec 10 2025


slz022-101600-
saint lawrence river from cape vincent to ogdensburg-
402 am est wed dec 10 2025

.today...south winds 5 to 10 knots. snow through early afternoon,
then snow and rain late. 
.tonight...southwest winds 5 to 15 knots becoming west. snow and
rain in the evening, then snow showers likely after midnight. 
.thursday...west winds 15 to 20 knots. snow showers likely. 
.thursday night...west winds 15 to 20 knots diminishing to 5 to
15 knots. snow showers likely in the evening, then a chance of
snow showers overnight. 
.friday...west winds 10 knots or less becoming south. a chance of
snow showers friday night. 
.saturday...south winds 5 to 10 knots becoming southwest. snow
showers likely. 
.sunday...west winds 5 to 10 knots becoming northwest. snow
showers likely during the day, then a chance of snow showers
sunday night. 

$$