fzus61 kbuf 190902
glflo 
expires:202512191600;;848442

open lake forecast for lake ontario
national weather service buffalo ny
402 am 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 29.0 inch low near lake superior will deepen to 28.9 
inches while moving to central quebec by friday, with its trailing 
strong cold front crossing the lake early friday morning. in its 
wake, a 30.1 inch high will slowly build across the lake friday 
night and early saturday, then will drift off the atlantic coastline 
later saturday and saturday night, with a 29.5 inch low moving 
across ontario and quebec and pushing its attendant cold front 
across the lake sunday. a large 30.6 inch high will then build east 
across the lake monday.


loz064-065-191600-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 am est fri dec 19 2025

...gale warning in effect through late tonight...

.today...south winds to 30 knots becoming west and increasing to
40 knot gales this afternoon. rain showers this morning, then a
chance of rain and snow showers early this afternoon. a chance of
snow showers late. waves 6 to 9 feet building to 14 to 18 feet.
waves occasionally around 23 feet. 
.tonight...west gales to 45 knots diminishing to 30 knots after
midnight. snow showers likely in the evening, then a chance of
snow showers after midnight. waves 16 to 21 feet subsiding to
11 to 15 feet. waves occasionally around 27 feet. 
.saturday...west winds 15 to 25 knots becoming south. waves 6 to
9 feet subsiding to 3 to 6 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 showers
in the evening, then a chance of snow and rain showers overnight.
waves 5 to 8 feet building to 10 to 14 feet. waves occasionally
around 18 feet. 
.sunday...west gales to 35 knots becoming northwest and
diminishing to 15 to 20 knots. lake effect snow showers likely.
waves 13 to 17 feet subsiding to 6 to 9 feet. waves occasionally
around 22 feet. 
.monday...northwest winds 10 to 15 knots becoming south 15 to
20 knots. a chance of snow showers monday night. waves 2 to
4 feet. 
.tuesday...south winds 15 to 25 knots becoming northwest. rain
and snow showers likely during the day, then a chance of rain
showers tuesday night. waves 3 to 6 feet building to 4 to 7 feet.
waves occasionally around 9 feet. 

$$

fzus61 kbuf 190902
glfsl 
expires:202512191600;;848438

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


slz022-191600-
saint lawrence river from cape vincent to ogdensburg-
402 am est fri dec 19 2025

...small craft advisory in effect through this evening...

.today...south winds 15 to 25 knots becoming southwest. rain
showers this morning, then a chance of rain showers early this
afternoon. a chance of snow and rain showers late. 
.tonight...west winds 15 to 25 knots. a chance of snow showers in
the evening. 
.saturday...west winds 5 to 15 knots becoming south. mostly 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 and rain showers likely overnight. 
.sunday...west winds 15 to 20 knots becoming northwest 5 to
15 knots. snow showers likely during the day. 
.monday...west winds 10 knots or less becoming south. a chance of
snow showers monday night. 
.tuesday...south winds 5 to 10 knots becoming west. snow showers
with rain showers likely during the day, then snow and rain
showers likely tuesday night. 

$$

fzus61 kbuf 190902
glfsl 
expires:202512191600;;848439

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


slz024-191600-
saint lawrence river from ogdensburg to saint regis-
402 am est fri dec 19 2025

...small craft advisory in effect through this evening...

.today...south winds to 30 knots becoming southwest. rain showers
through early afternoon, then a chance of snow showers late. 
.tonight...southwest winds to 30 knots becoming west 15 to
25 knots. a chance of snow showers in the evening. 
.saturday...west winds 15 to 20 knots becoming south and
diminishing to 5 to 10 knots. sunny in the morning, then becoming
partly sunny. 
.saturday night...south winds 10 to 15 knots becoming southwest
15 to 20 knots. a chance of snow showers. 
.sunday...southwest winds 15 to 20 knots becoming west 10 to
15 knots. a chance of snow showers during the day. 
.monday...west winds 5 to 10 knots becoming south. a chance of
snow showers monday night. 
.tuesday...south winds 5 to 10 knots becoming west. snow showers.

$$