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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
410 am edt tue may 12 2026


slz022-024-121500-
saint lawrence river from cape vincent to saint regis
410 am edt tue may 12 2026

.today...light and variable winds becoming west 5 to 10 knots.
sunny.
.tonight...southwest winds 5 to 10 knots becoming southeast. a
chance of showers late. 
.wednesday...southeast winds 5 to 15 knots becoming south.
showers.
.wednesday night...south winds 10 knots or less. showers.
.thursday...southwest winds less than 10 knots becoming north.
showers.
.friday...north winds 10 knots or less becoming southwest. partly
to mostly cloudy. 
.saturday...southwest winds 5 to 15 knots. a chance of showers. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
409 am edt tue may 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 30.3 inch high over the lower great lakes this morning 
will drift to the eastern seaboard through tonight. a 29.7 inch low 
over the central great lakes tonight will move to near the north 
shore of lake ontario by wednesday evening, then weaken into a 
trough over eastern new york and new england thursday. a 30.1 inch 
high will then build from the central great lakes and ohio valley 
thursday night to the lower great lakes and mid atlantic friday, 
then off the carolina coast saturday.


loz062-121500-
lake ontario open waters from the niagara river to hamlin beach-
409 am edt tue may 12 2026

.today...east winds 10 knots or less. waves 1 foot or less. 
.tonight...east winds 5 to 15 knots becoming southeast 15 to
20 knots. a chance of showers early, then showers from late
evening on. waves 2 feet or less building to 2 to 3 feet. 
.wednesday...south winds 15 to 20 knots becoming southwest.
showers. waves 2 to 4 feet. 
.wednesday night...southwest winds 10 to 15 knots becoming west.
a chance of showers in the evening. waves 1 to 3 feet. 
.thursday...west winds 5 to 10 knots becoming northwest. waves
2 feet or less. 
.friday...northwest winds 5 to 15 knots becoming southwest. waves
1 to 2 feet. 
.saturday...southwest winds 15 to 20 knots becoming west 10 to
15 knots. waves 1 to 3 feet building to 2 to 4 feet, then
subsiding to 1 to 3 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
409 am edt tue may 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 30.3 inch high over the lower great lakes this morning 
will drift to the eastern seaboard through tonight. a 29.7 inch low 
over the central great lakes tonight will move to near the north 
shore of lake ontario by wednesday evening, then weaken into a 
trough over eastern new york and new england thursday. a 30.1 inch 
high will then build from the central great lakes and ohio valley 
thursday night to the lower great lakes and mid atlantic friday, 
then off the carolina coast saturday.


loz063>065-121500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
409 am edt tue may 12 2026

.today...north winds 10 knots or less becoming northeast. waves
1 foot or less. 
.tonight...east winds 5 to 15 knots becoming southeast 15 to
20 knots. a chance of showers. showers late. waves 1 to 3 feet. 
.wednesday...southeast winds 15 to 25 knots becoming south.
showers. waves 3 to 6 feet subsiding to 2 to 4 feet. 
.wednesday night...southwest winds 5 to 15 knots becoming west.
showers in the evening, then a chance of showers overnight. waves
1 to 3 feet. 
.thursday...west winds 5 to 10 knots becoming northwest. a chance
of showers during the day. waves 2 feet or less. 
.friday...northwest winds 5 to 10 knots becoming southwest. waves
2 feet or less. 
.saturday...south winds 10 to 15 knots becoming west. waves 1 to
3 feet. 

$$

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open lake forecast for lake erie
national weather service cleveland oh
400 am edt tue may 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...
a warm front will cross the lake today. low pressure 29.60 inches
will move southeast across the great lakes tonight into wednesday.
this low will extend a cold front across the lake by wednesday
night. a trough averaging 29.90 inches will remain across the lake
on thursday. high pressure 30.10 inches will move through the
region thursday night into friday. a warm front will move across
the lake on friday night into saturday.


lez061-168-169-121415-
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-
400 am edt tue may 12 2026

.today...east winds 10 knots or less becoming northeast. waves
1 foot or less. 
.tonight...east winds 5 to 10 knots becoming south and increasing
to 15 to 20 knots. a slight chance of showers early, then a
chance of showers late in the evening. showers with a slight
chance of thunderstorms after midnight. waves 1 foot or less
building to 1 to 3 feet. 
.wednesday...southwest winds 15 to 25 knots becoming west.
showers in the morning. waves 3 to 5 feet building to 4 to
7 feet. waves occasionally around 9 feet. 
.wednesday night...west winds 15 to 20 knots. a chance of
showers. waves 3 to 5 feet subsiding to 2 to 4 feet. 
.thursday...northwest winds 15 to 20 knots diminishing to 5 to
15 knots. a chance of showers during the day. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.friday...northwest winds 10 knots or less becoming south. waves
2 feet or less. 
.saturday...southwest winds 5 to 15 knots. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$