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open lake forecast for lake ontario
national weather service buffalo ny
402 am est thu dec 18 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 29.1 inch low near lake superior this morning, 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.


loz062-181600-
lake ontario open waters from the niagara river to hamlin beach-
402 am est thu dec 18 2025

...gale warning in effect from friday morning through late friday
night...

.today...south winds 10 to 15 knots increasing to 15 to 25 knots.
waves 1 to 3 feet building to 3 to 5 feet. 
.tonight...south winds to 30 knots becoming southwest. a chance
of showers early, then showers from late evening on. waves 3 to
5 feet building to 6 to 9 feet. waves occasionally around
11 feet. 
.friday...southwest winds to 30 knots becoming west and
increasing to 40 knot gales. rain and snow showers likely in the
morning, then snow showers likely in the afternoon. waves 7 to
10 feet building to 12 to 16 feet. waves occasionally around
20 feet. 
.friday night...west gales to 40 knots diminishing to 15 to
20 knots. a chance of snow showers in the evening. waves 12 to
16 feet subsiding to 5 to 8 feet. waves occasionally around
20 feet. 
.saturday...southwest winds 15 to 25 knots becoming west to
30 knots. a chance of rain and snow showers. waves 3 to 5 feet
building to 7 to 10 feet. waves occasionally around 13 feet. 
.sunday...west gales to 35 knots becoming northwest and
diminishing to 15 to 20 knots. a chance of snow showers during
the day. waves 10 to 13 feet subsiding to 4 to 7 feet. waves
occasionally around 16 feet. 
.monday...northwest winds 10 to 15 knots becoming south. a chance
of snow showers monday night. waves 1 to 3 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am est thu dec 18 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 29.1 inch low near lake superior this morning, 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.


loz063-181600-
lake ontario open waters from hamlin beach to sodus bay-
402 am est thu dec 18 2025

...gale warning in effect from friday morning through late friday
night...

.today...south winds 15 to 25 knots increasing to 30 knots. waves
3 to 6 feet building to 4 to 7 feet. waves occasionally around
9 feet. 
.tonight...south winds to 30 knots becoming southwest. showers
from late evening on. waves 5 to 8 feet building to 5 to 9 feet.
waves occasionally around 11 feet. 
.friday...southwest winds to 30 knots becoming west and
increasing to 40 knot gales. rain showers with snow showers
likely in the morning, then snow showers likely in the afternoon.
waves 7 to 10 feet building to 15 to 19 feet. waves occasionally
around 24 feet. 
.friday night...west gales to 40 knots diminishing to 15 to
25 knots. snow showers likely in the evening, then a chance of
snow showers overnight. waves 15 to 20 feet subsiding to 8 to
11 feet. waves occasionally around 26 feet. 
.saturday...southwest winds 10 to 15 knots increasing to
30 knots. a chance of rain and snow showers. waves 4 to 7 feet
building to 8 to 11 feet. waves occasionally around 14 feet. 
.sunday...west gales to 40 knots becoming northwest and
diminishing to 15 to 25 knots. a chance of snow showers. waves
11 to 16 feet subsiding to 6 to 9 feet. waves occasionally around
20 feet. 
.monday...northwest winds 15 to 20 knots becoming south. a chance
of snow showers monday night. waves 3 to 5 feet subsiding to 1 to
3 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am est thu dec 18 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 29.1 inch low near lake superior this morning, 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.


loz064-065-181600-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 am est thu dec 18 2025

...gale warning in effect from friday morning through late friday
night...

.today...south winds 15 to 25 knots increasing to 30 knots. waves
3 to 6 feet building to 5 to 8 feet. waves occasionally around
10 feet. 
.tonight...south winds to 30 knots. showers from late evening on.
waves 5 to 9 feet building to 7 to 10 feet. waves occasionally
around 13 feet. 
.friday...southwest winds to 30 knots becoming west and
increasing to 45 knot gales. lake effect rain and snow showers.
waves 7 to 10 feet building to 15 to 20 feet. waves occasionally
around 26 feet. 
.friday night...west gales to 45 knots diminishing to 15 to
25 knots overnight. lake effect snow showers. waves 16 to 21 feet
subsiding to 9 to 12 feet. waves occasionally around 27 feet. 
.saturday...west winds 10 to 15 knots becoming southwest and
increasing to 30 knots. a chance of snow and rain showers during
the day, then rain and snow showers likely saturday night. waves
4 to 7 feet building to 8 to 11 feet. waves occasionally around
14 feet. 
.sunday...west gales to 40 knots becoming northwest and
diminishing to 15 to 25 knots. snow showers likely during the
day, then a chance of snow showers sunday night. waves 11 to
16 feet subsiding to 7 to 10 feet. waves occasionally around
20 feet. 
.monday...northwest winds 15 to 20 knots becoming south. a chance
of snow showers monday night. waves 3 to 5 feet subsiding to 2 to
4 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am est thu dec 18 2025


slz022-181600-
saint lawrence river from cape vincent to ogdensburg-
402 am est thu dec 18 2025

.today...south winds 5 to 15 knots increasing to 15 to 20 knots.
partly sunny. 
.tonight...south winds 15 to 25 knots. rain showers from late
evening on. 
.friday...southwest winds 15 to 25 knots. rain showers in the
morning, then rain showers with snow showers likely in the
afternoon. 
.friday night...west winds 15 to 25 knots diminishing to 5 to
10 knots overnight. snow showers likely in the evening, then a
chance of snow showers overnight. 
.saturday...southwest winds 5 to 15 knots. a chance of snow
showers during the day, then snow and rain showers likely
saturday night. 
.sunday...southwest winds 5 to 15 knots becoming northwest. snow
showers likely during the day. 
.monday...west winds 10 knots or less becoming south. a chance of
snow showers monday night. 

$$

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open lake forecast for lake erie
national weather service cleveland oh
332 am est thu dec 18 2025

for waters beyond five nautical miles of shore on lake erie

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 warm front sweeps northward across lake erie during the predawn
hours of this morning. otherwise, a ridge averaging 30.00 inches
exits eastward from the lake today as a low of 29.10 inches 
wobbles eastward from northern minnesota to lake superior. 
tonight, the low should wobble northeastward to west-central 
quebec, deepen to 28.90 inches, and allow a strong cold front to 
sweep eastward across lake erie. behind the front, a trough 
averaging 29.90 inches should linger over lake erie on friday as 
a ridge attempts to build from the upper midwest. this ridge, 
averaging 30.10 inches, should traverse lake erie from west to 
east on friday night and be followed by a warm front sweeping
northward across the lake. on saturday, the ridge should continue
exiting eastward. during saturday night, a cold front should 
sweep eastward across lake erie. behind the front, a ridge 
averaging 30.20 inches should build from the upper midwest through
sunday night and then exit slowly eastward from lake erie on 
monday.


lez061-168-169-181530-
ripley to buffalo ny extending from 5nm off shoreline to us-
canadian border-geneva-on-the-
lake to conneaut oh beyond 5 nm off shoreline to us-
canadian border-
conneaut oh to ripley ny beyond 5 nm off shoreline to us-
canadian border-
332 am est thu dec 18 2025

...gale warning in effect from friday morning through friday
evening...

.today...south winds 15 to 25 knots increasing to 30 knots. waves
2 to 4 feet building to 5 to 8 feet. waves occasionally around
10 feet. 
.tonight...south winds to 30 knots becoming southwest. a chance
of rain showers early, then rain showers. a chance of rain
showers late. waves 5 to 9 feet building to 8 to 12 feet. waves
occasionally around 15 feet. 
.friday...west gales to 35 knots increasing to 40 knots. a chance
of snow and rain showers in the morning, then a chance of snow in
the afternoon. waves 10 to 15 feet building to 12 to 16 feet.
waves occasionally around 20 feet. 
.friday night...west gales to 40 knots becoming southwest and
diminishing to 15 to 20 knots overnight. waves 11 to 15 feet
subsiding to 3 to 6 feet. waves occasionally around 19 feet. 
.saturday...south winds 15 to 25 knots becoming west to 30 knots.
a chance of rain saturday night. waves 3 to 6 feet building to
6 to 9 feet. waves occasionally around 11 feet. 
.sunday...west winds to 30 knots diminishing to 15 to 20 knots.
waves 5 to 9 feet subsiding to 3 to 5 feet. waves occasionally
around 11 feet. 
.monday...west winds 10 to 15 knots becoming south and increasing
to 15 to 25 knots. a chance of snow and rain monday night. waves
1 to 3 feet. 

$$