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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm est fri dec 19 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 28.9 inch low over central quebec will continue 
to move east tonight. in its wake, a 30.1 inch high will slowly 
build across the lake tonight and early saturday, before drifting 
off the atlantic coastline later saturday and saturday night. a 29.5 
inch low moving across ontario and quebec will push its attendant 
cold front across the lake sunday. a large 30.6 inch high will then 
build east across the lake monday. a 29.8 inch low just north of 
lake superior tuesday will pass north of the lake, resulting in a 
pair of fronts passing across the region.


loz064-065-201000-
lake ontario open waters from sodus bay to the saint lawrence
river-
1002 pm est fri dec 19 2025

...gale warning in effect until 3 am est saturday...
...gale watch in effect from saturday evening through sunday
evening...

.rest of tonight...west gales to 40 knots diminishing to
30 knots. snow showers likely late this evening, then a chance of
snow showers after midnight. waves 15 to 20 feet subsiding to
10 to 14 feet. waves occasionally around 26 feet. 
.saturday...west winds 15 to 20 knots becoming south and
increasing to 30 knots. waves 6 to 9 feet subsiding to 4 to
7 feet. waves occasionally around 11 feet. 
.saturday night...south winds to 30 knots becoming west and
increasing to 35 knot gales overnight. a chance of rain and snow
showers. waves 5 to 8 feet building to 12 to 16 feet. waves
occasionally around 20 feet. 
.sunday...west gales to 35 knots. lake effect snow showers
likely. waves 13 to 17 feet. waves occasionally around 22 feet. 
.sunday night...northwest gales to 35 knots diminishing to 15 to
25 knots. a chance of snow showers in the evening. waves 11 to
15 feet subsiding to 4 to 7 feet. waves occasionally around
19 feet. 
.monday...west winds 10 to 15 knots becoming south 15 to
20 knots. snow showers likely monday night. waves 3 to 5 feet
subsiding to 2 to 4 feet. 
.tuesday...south winds 15 to 25 knots becoming northwest to
30 knots. rain and snow showers during the day, then a chance of
rain showers tuesday night. waves 3 to 5 feet building to 6 to
10 feet. waves occasionally around 13 feet. 
.wednesday...northwest winds 15 to 20 knots becoming south 5 to
15 knots. a chance of rain showers wednesday night. waves 4 to
7 feet subsiding to 1 to 3 feet. waves occasionally around
9 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 pm est fri dec 19 2025


slz022-201000-
saint lawrence river from cape vincent to ogdensburg-
1002 pm est fri dec 19 2025

...small craft advisory in effect until midnight est tonight...

.rest of tonight...west winds 15 to 20 knots diminishing to 10 to
15 knots. a chance of snow showers late this evening. 
.saturday...west winds 5 to 15 knots becoming south. sunny in the
morning, then becoming mostly cloudy. 
.saturday night...south winds 15 to 20 knots becoming southwest.
a chance of snow and rain showers in the evening, then lake
effect snow showers likely with a chance of lake effect rain
showers overnight. 
.sunday...southwest winds 15 to 20 knots becoming west 10 to
15 knots. partly sunny. 
.sunday night...northwest winds 5 to 15 knots becoming west.
mostly cloudy in the evening, then clearing. 
.monday...west winds 10 knots or less becoming south. snow
showers likely monday night. 
.tuesday...south winds 5 to 10 knots becoming west. snow showers
with a chance of rain showers during the day, then a chance of
rain and snow showers tuesday night. 
.wednesday...northwest winds 10 knots or less becoming south.
partly cloudy, then becoming mostly cloudy. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 pm est fri dec 19 2025


slz024-201000-
saint lawrence river from ogdensburg to saint regis-
1002 pm est fri dec 19 2025

...small craft advisory in effect until midnight est tonight...

.rest of tonight...west winds to 30 knots diminishing to 15 to
20 knots. a chance of snow showers late this evening. 
.saturday...west winds 5 to 15 knots becoming south. sunny in the
morning, then becoming mostly cloudy. 
.saturday night...south winds 15 to 25 knots becoming southwest.
a chance of snow and rain showers in the evening, then lake
effect snow showers likely with a chance of lake effect rain
showers overnight. 
.sunday...southwest winds 15 to 25 knots becoming west. partly
sunny. 
.sunday night...west winds 15 to 20 knots diminishing to 5 to
10 knots. mostly cloudy in the evening, then clearing. 
.monday...west winds 5 to 10 knots becoming south. snow showers
likely monday night. 
.tuesday...south winds 5 to 15 knots becoming west. snow showers
with rain showers likely. 
.wednesday...northwest winds 10 knots or less becoming south.
mostly cloudy. 

$$