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open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt thu sep 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...high pressure averaging 30.0 inches draped from the ohio 
valley to new england will gradually weaken in place today. a weak 
cold front will then cross the lake this evening, with another 30.4 
inch high then settling from central ontario to new england friday 
through saturday night, then off the new england coast sunday and 
monday.


loz062-182100-
lake ontario open waters from the niagara river to hamlin beach-
1002 am edt thu sep 18 2025

.this afternoon...west winds 5 to 10 knots becoming southwest.
waves 1 foot or less. 
.tonight...west winds 5 to 15 knots becoming northeast. a chance
of sprinkles after midnight. waves 1 to 3 feet. 
.friday...northeast winds 5 to 15 knots becoming east less than
10 knots. waves 1 to 3 feet subsiding to 1 foot or less. 
.friday night...east winds 5 to 15 knots increasing to 15 to
20 knots. waves 2 feet or less building to 3 to 5 feet. 
.saturday...east winds 15 to 20 knots. waves 3 to 5 feet
subsiding to 2 to 4 feet. 
.sunday...southeast winds 10 to 15 knots becoming south. a chance
of showers sunday night. waves 1 to 3 feet. 
.monday...southwest winds 10 to 15 knots. a chance of showers.
waves 1 to 2 feet. 

$$

fzus61 kbuf 181402
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open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt thu sep 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...high pressure averaging 30.0 inches draped from the ohio 
valley to new england will gradually weaken in place today. a weak 
cold front will then cross the lake this evening, with another 30.4 
inch high then settling from central ontario to new england friday 
through saturday night, then off the new england coast sunday and 
monday.


loz063>065-182100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt thu sep 18 2025

.this afternoon...west winds 5 to 10 knots. waves 2 feet or less. 
.tonight...west winds 5 to 15 knots becoming north 15 to
20 knots. a chance of sprinkles from late evening on. waves 1 to
3 feet building to 2 to 4 feet. 
.friday...north winds 15 to 20 knots diminishing to 5 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.friday night...north winds 10 to 15 knots becoming northeast
15 to 20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.saturday...northeast winds 15 to 20 knots becoming southeast
10 to 15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.sunday...southeast winds 15 to 20 knots becoming south. waves
1 to 3 feet building to 2 to 4 feet. 
.monday...south winds 15 to 20 knots becoming southwest 10 to
15 knots. a chance of showers. waves 2 to 4 feet subsiding to
1 to 3 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 am edt thu sep 18 2025


slz022-024-182100-
saint lawrence river from cape vincent to saint regis
1002 am edt thu sep 18 2025

.this afternoon...southwest winds 10 knots or less becoming west.
mostly sunny. 
.tonight...northwest winds 10 knots or less becoming north. a
chance of sprinkles late in the evening. 
.friday...north winds 5 to 10 knots. sunny.
.friday night...north winds 5 to 10 knots becoming northeast.
mainly clear. 
.saturday...northeast winds 10 knots or less becoming east.
mainly clear. 
.sunday...southeast winds 5 to 10 knots becoming south. partly to
mostly cloudy. 
.monday...south winds 5 to 10 knots becoming southwest. a chance
of showers during the day, then showers likely monday night. 

$$

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open lake forecast for lake erie
national weather service cleveland oh
948 am edt thu sep 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...
high pressure ridging averaging 30.20 inches and extending from
new england lingers over lake erie for the time being. a cold 
front will sweep southward across the lake this evening through 
tonight. behind the front, another ridge averaging 30.20 inches 
affects lake erie as the parent high pressure center moves from 
near hudson bay to atlantic waters near nova scotia by daybreak 
sunday. a warm front should drift northward across lake erie on 
sunday through early monday. behind the front, another ridge 
averaging 29.95 inches should build from the southern appalachians
through this tuesday.


lez061-169-182030-
ripley to buffalo ny extending from 5nm off shoreline to us-
canadian border-
conneaut oh to ripley ny beyond 5 nm off shoreline to us-
canadian border-
948 am edt thu sep 18 2025

.this afternoon...west winds 5 to 10 knots. waves 2 feet or less. 
.tonight...west winds 5 to 15 knots becoming northeast. waves
1 to 2 feet. 
.friday...northeast winds 10 to 15 knots. waves 1 to 2 feet. 
.friday night...northeast winds 10 to 15 knots becoming east.
waves 1 to 3 feet. 
.saturday...east winds 15 to 20 knots becoming southeast 10 to
15 knots. waves 2 to 4 feet building to 3 to 5 feet, then
subsiding to 2 to 4 feet. 
.sunday...south winds 5 to 15 knots increasing to 15 to 20 knots.
a chance of showers sunday night. waves 1 to 3 feet. 
.monday...south winds 10 to 15 knots becoming southwest. a chance
of showers during the day, then showers likely monday night.
waves 1 to 3 feet. 

$$