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open lake forecast for lake ontario
national weather service buffalo ny
1002 am est wed nov 12 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 28.2 inch low will slowly advance northwards across 
newfoundland today. meanwhile, a weak 29.5 inch wave of low pressure 
will cross the great lakes. another 29.2 inch low will develop south 
of nova scotia thursday, then move north across the canadian 
maritimes friday, remaining in place through saturday. meanwhile, a 
30.1 inch high will then build from northwest ontario province 
friday to james bay and the lower great lakes by saturday. a 29.2 
inch low will track across the lake and to new england through the 
day on sunday.


loz063-122200-
lake ontario open waters from hamlin beach to sodus bay-
1002 am est wed nov 12 2025

.rest of today...southwest winds to 30 knots becoming west. lake
effect rain. waves 4 to 7 feet building to 6 to 10 feet. waves
occasionally around 13 feet. 
.tonight...west winds to 30 knots. lake effect showers. waves
6 to 10 feet. waves occasionally around 13 feet. 
.thursday...west winds 20 to 25 knots. showers. waves 6 to
9 feet. waves occasionally around 11 feet. 
.thursday night...northwest winds 15 to 25 knots. showers likely.
waves 5 to 8 feet subsiding to 3 to 5 feet. waves occasionally
around 10 feet. 
.friday...northwest winds 15 to 20 knots becoming north 5 to
15 knots. a chance of rain showers during the day. waves 3 to
5 feet subsiding to 1 to 3 feet. 
.saturday...southeast winds 5 to 15 knots becoming southwest
15 to 20 knots. a chance of rain showers during the day, then
rain saturday night. waves 1 to 3 feet building to 3 to 5 feet. 
.sunday...west winds to 30 knots becoming northwest. rain during
the day, then rain likely with a chance of snow sunday night.
waves 7 to 10 feet building to 9 to 13 feet. waves occasionally
around 16 feet. 

$$

fzus61 kbuf 121502
glflo 
expires:202511122200;;290781

open lake forecast for lake ontario
national weather service buffalo ny
1002 am est wed nov 12 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 28.2 inch low will slowly advance northwards across 
newfoundland today. meanwhile, a weak 29.5 inch wave of low pressure 
will cross the great lakes. another 29.2 inch low will develop south 
of nova scotia thursday, then move north across the canadian 
maritimes friday, remaining in place through saturday. meanwhile, a 
30.1 inch high will then build from northwest ontario province 
friday to james bay and the lower great lakes by saturday. a 29.2 
inch low will track across the lake and to new england through the 
day on sunday.


loz064-065-122200-
lake ontario open waters from sodus bay to the saint lawrence
river-
1002 am est wed nov 12 2025

.rest of today...southwest winds to 30 knots becoming west. lake
effect rain. waves 5 to 9 feet building to 7 to 10 feet. waves
occasionally around 13 feet. 
.tonight...west winds to 30 knots becoming northwest. rain
showers likely early, then a chance of rain showers from late
evening on. waves 6 to 10 feet. waves occasionally around
13 feet. 
.thursday...northwest winds 15 to 25 knots becoming west. rain
showers. waves 5 to 9 feet. waves occasionally around 11 feet. 
.thursday night...northwest winds 15 to 25 knots. rain showers.
waves 5 to 8 feet subsiding to 3 to 6 feet. waves occasionally
around 10 feet. 
.friday...northwest winds 5 to 15 knots becoming north. rain
showers likely during the day, then a chance of rain and snow
showers friday night. waves 3 to 5 feet subsiding to 1 to 3 feet.
.saturday...east winds 5 to 10 knots becoming south and
increasing to 15 to 20 knots. a chance of rain showers during the
day, then rain saturday night. waves 1 foot or less building to
3 to 5 feet. 
.sunday...west winds to 30 knots becoming northwest. rain during
the day, then rain with snow likely sunday night. waves 7 to
10 feet building to 9 to 13 feet. waves occasionally around
16 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 nov 12 2025


slz022-122200-
saint lawrence river from cape vincent to ogdensburg-
1002 am est wed nov 12 2025

.rest of today...southwest winds 10 to 15 knots. lake effect rain
and snow, then lake effect rain late. 
.tonight...west winds 5 to 15 knots. rain showers likely early,
then a chance of rain showers late in the evening. 
.thursday...west winds 5 to 10 knots. rain and snow showers
likely in the morning, then rain showers likely in the afternoon.
.thursday night...west winds 10 knots or less. a chance of rain
and snow showers. 
.friday...northwest winds 10 knots or less. a chance of rain and
snow showers during the day. 
.saturday...southwest winds 10 knots or less becoming south. a
chance of rain showers during the day, then rain saturday night. 
.sunday...west winds 5 to 15 knots. rain during the day, then
rain with snow likely sunday night. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 am est wed nov 12 2025


slz024-122200-
saint lawrence river from ogdensburg to saint regis-
1002 am est wed nov 12 2025

.rest of today...southwest winds 5 to 10 knots. lake effect snow
late this morning, then lake effect rain and snow early this
afternoon. lake effect rain late. 
.tonight...southwest winds less than 10 knots becoming west. rain
showers likely early, then rain showers with snow showers likely.
a chance of snow showers late. 
.thursday...west winds 10 knots or less. snow showers with rain
showers likely. 
.thursday night...west winds less than 10 knots. a chance of snow
and rain showers in the evening, then a chance of snow showers
overnight. 
.friday...west winds less than 10 knots. a chance of snow showers
during the day. 
.saturday...west winds less than 10 knots becoming southeast. a
chance of rain showers during the day, then rain with snow likely
saturday night. 
.sunday...southwest winds 5 to 10 knots becoming west. rain
during the day, then snow and rain likely sunday night. 

$$