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open lake forecast for lake ontario
national weather service buffalo ny
1002 am est sat nov 29 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 30.5 inch surface high will build from the ohio valley 
and lower great lakes to the mid-atlantic today. a surface low will 
cut northeastward through the central great lakes sunday, slowly 
deepening from 29.6 inches sunday morning to 29.4 inches sunday 
night over western quebec. a cold front from this low will cross the 
lake late sunday night. a 30.4 inch surface high centered over the 
central plains will then build east across the great lakes monday, 
sliding quickly to new england on tuesday. a 29.7 inch surface low 
off the carolina coastline tuesday morning will deepen to 28.9 
inches over southern atlantic canada by early wednesday morning 
before going out to sea. a 30.2 inch surface high will build across 
the ohio valley and lower great lakes later wednesday into thursday 
morning before pushing off the coast. a large 29.2 inch surface low 
near hudson bay will push its cold front across the lake on 
thursday.


loz064-065-292200-
lake ontario open waters from sodus bay to the saint lawrence
river-
1002 am est sat nov 29 2025

...gale watch in effect from sunday morning through monday
morning...

.this afternoon...northwest winds 15 to 20 knots becoming west
5 to 15 knots. waves 3 to 6 feet subsiding to 1 to 3 feet. 
.tonight...southwest winds less than 10 knots becoming southeast
and increasing to 30 knots after midnight. snow showers after
midnight. waves 1 to 3 feet building to 3 to 6 feet. 
.sunday...south winds to 30 knots becoming southwest and
increasing to 35 knot gales in the afternoon. snow and rain
showers. waves 5 to 9 feet building to 9 to 12 feet. waves
occasionally around 15 feet. 
.sunday night...southwest gales to 35 knots becoming northwest
and diminishing to 30 knots overnight. rain and snow showers in
the evening, then snow showers, rain showers with a chance of
freezing rain overnight. waves 10 to 15 feet. waves occasionally
around 19 feet. 
.monday...northwest winds to 30 knots becoming south and
diminishing to 15 to 20 knots. a chance of freezing rain during
the day, then a chance of snow showers monday night. waves 8 to
11 feet subsiding to 1 to 3 feet. waves occasionally around
14 feet. 
.tuesday...south winds 15 to 20 knots becoming north 10 to
15 knots. snow showers. waves 2 to 4 feet subsiding to 1 to
3 feet. 
.wednesday...west winds 10 to 15 knots increasing to 30 knots. a
chance of snow showers during the day, then snow showers likely
wednesday night. waves 1 to 3 feet building to 8 to 11 feet.
waves occasionally around 14 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 am est sat nov 29 2025


slz022-292200-
saint lawrence river from cape vincent to ogdensburg-
1002 am est sat nov 29 2025

.this afternoon...west winds 10 knots or less. sunny.
.tonight...light and variable winds becoming southeast 10 to
15 knots. snow showers after midnight. 
.sunday...southeast winds 10 to 15 knots becoming south 15 to
20 knots. snow showers in the morning, then rain and snow showers
in the afternoon. 
.sunday night...southwest winds 15 to 20 knots becoming west
10 to 15 knots. rain and snow showers in the evening, then snow
showers, rain showers with a chance of freezing rain overnight. 
.monday...northwest winds 5 to 15 knots becoming south 10 knots
or less. a chance of freezing rain during the day, then a chance
of snow showers monday night. 
.tuesday...south winds 10 knots or less becoming northwest. snow
showers likely. 
.wednesday...southwest winds 10 knots or less becoming west 10 to
15 knots. snow showers likely wednesday night. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 am est sat nov 29 2025


slz024-292200-
saint lawrence river from ogdensburg to saint regis-
1002 am est sat nov 29 2025

.this afternoon...west winds 10 knots or less. mostly sunny. 
.tonight...light and variable winds becoming southeast 5 to
10 knots. a chance of snow showers after midnight. snow showers
likely late. 
.sunday...southeast winds 5 to 15 knots becoming south. snow
showers in the morning, then snow and rain showers in the
afternoon. 
.sunday night...southwest winds 15 to 20 knots becoming west.
rain and snow showers in the evening, then snow showers
overnight. 
.monday...west winds 15 to 20 knots becoming south and
diminishing to less than 10 knots. a chance of snow showers
monday night. 
.tuesday...south winds 10 knots or less becoming northwest. snow
showers likely during the day, then a chance of snow showers
tuesday night. 
.wednesday...southwest winds 10 knots or less becoming west 10 to
15 knots. snow showers likely wednesday night. 

$$