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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 am edt sun jul 12 2026


slz022-024-122100-
saint lawrence river from cape vincent to saint regis
1003 am edt sun jul 12 2026

.this afternoon...light and variable winds. sunny.
.tonight...southwest winds less than 10 knots. mainly clear
early, then becoming partly cloudy. 
.monday...southwest winds 10 knots or less. mostly sunny. 
.monday night...southwest winds 5 to 15 knots. partly cloudy. 
.tuesday...southwest winds 15 to 20 knots becoming west 10 to
15 knots. a chance of showers tuesday night. 
.wednesday...northwest winds 10 knots or less becoming west.
partly cloudy. 
.thursday...west winds 10 knots or less. mainly clear, then
becoming partly cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt sun jul 12 2026

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 large 30.2 inch high will continue to build south 
across the lower great lakes today, before sliding east into new 
england monday, then off the coast by tuesday. this will allow a 
warm front to sweep across the lake tuesday, followed by a cold 
front pushing south across the lake on wednesday, trailed by a 
secondary cold front pushing south across the lake thursday.


loz062-122100-
lake ontario open waters from the niagara river to hamlin beach-
1002 am edt sun jul 12 2026

.this afternoon...northeast winds less than 10 knots becoming
east. waves 1 foot or less. 
.tonight...southeast winds less than 10 knots. waves 1 foot or
less. 
.monday...light and variable winds becoming southwest 5 to
10 knots. waves 1 foot or less. 
.monday night...southwest winds 10 to 15 knots increasing to
15 to 20 knots. waves 1 to 3 feet. 
.tuesday...southwest winds 15 to 20 knots becoming west. waves
2 to 4 feet building to 3 to 6 feet. 
.wednesday...west winds 5 to 15 knots becoming northwest. waves
2 to 4 feet subsiding to 1 to 2 feet. 
.thursday...west winds 5 to 15 knots becoming northwest. waves
1 to 2 feet. 

$$

fzus61 kbuf 121402
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open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt sun jul 12 2026

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 large 30.2 inch high will continue to build south 
across the lower great lakes today, before sliding east into new 
england monday, then off the coast by tuesday. this will allow a 
warm front to sweep across the lake tuesday, followed by a cold 
front pushing south across the lake on wednesday, trailed by a 
secondary cold front pushing south across the lake thursday.


loz063>065-122100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt sun jul 12 2026

.this afternoon...northeast winds 10 knots or less becoming north.
waves 1 foot or less. 
.tonight...south winds less than 10 knots. waves 1 foot or less. 
.monday...southwest winds 5 to 10 knots becoming west. waves
1 foot or less. 
.monday night...southwest winds 5 to 15 knots increasing to 15 to
20 knots. waves 1 to 3 feet. 
.tuesday...southwest winds 15 to 25 knots becoming west. waves
3 to 6 feet building to 4 to 7 feet. waves occasionally around
9 feet. 
.wednesday...west winds 15 to 20 knots becoming northwest 10 to
15 knots. waves 3 to 6 feet subsiding to 1 to 3 feet. 
.thursday...northwest winds 5 to 15 knots. waves 1 to 3 feet. 

$$

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open lake forecast for lake erie
national weather service cleveland oh
931 am edt sun jul 12 2026

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 of 30.20 inches will build over great lakes today 
and tomorrow before settling south to the ohio valley on tuesday.
high pressure will persist through thursday.


lez061-167>169-122030-
ripley to buffalo ny extending from 5nm off shoreline to us-
canadian border-willowick to geneva-on-the-
lake oh beyond 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-
931 am edt sun jul 12 2026

.this afternoon...northeast winds 10 to 15 knots increasing to
15 to 20 knots. waves 1 to 3 feet. 
.tonight...northeast winds 5 to 15 knots becoming east less than
10 knots. waves 1 to 3 feet subsiding to 1 foot or less. 
.monday...southeast winds less than 10 knots becoming northwest.
waves 1 foot or less. 
.monday night...southwest winds 10 knots or less. waves 1 foot or
less. 
.tuesday...southwest winds 10 to 15 knots becoming west. waves
1 to 2 feet building to 2 to 4 feet. 
.wednesday...west winds 5 to 10 knots becoming north. waves 1 to
3 feet. 
.thursday...northwest winds 5 to 10 knots becoming north. waves
2 feet or less. 

$$