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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
404 am edt tue apr 21 2026


slz022-024-211500-
saint lawrence river from cape vincent to saint regis
404 am edt tue apr 21 2026

.today...south winds 5 to 15 knots becoming southwest. partly
sunny. 
.tonight...south winds 5 to 15 knots becoming southeast. a chance
of rain showers late in the evening. 
.wednesday...east winds less than 10 knots becoming north. partly
to mostly sunny. 
.wednesday night...northeast winds less than 10 knots. partly
cloudy. 
.thursday...northwest winds 10 knots or less becoming north.
partly cloudy. 
.friday...north winds 10 knots or less becoming northeast. mainly
clear. 
.saturday...northeast winds 10 knots or less becoming east. a
chance of rain showers. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
403 am edt tue apr 21 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 30.4 inch high will settle southeast across the great 
lakes tonight, before sliding off the mid-atlantic coast tuesday. a 
29.4 inch low over lower hudson bay tuesday, will weaken to 29.9 
inches by wednesday, while pushing a cold front across the lake 
tuesday night. a 30.2 inch high will then build across the great 
lakes region wednesday and thursday. a warm front will approach the 
lake by friday. a 29.6 inch low may move southwest of the lake on 
saturday.


loz062-211500-
lake ontario open waters from the niagara river to hamlin beach-
403 am edt tue apr 21 2026

.today...south winds 5 to 15 knots becoming southeast. waves
2 feet or less. 
.tonight...southeast winds 5 to 15 knots becoming northeast. a
chance of rain showers after midnight. waves 1 to 3 feet. 
.wednesday...north winds less than 10 knots. waves 2 feet or
less. 
.wednesday night...west winds less than 10 knots becoming
northwest. waves 1 foot or less. 
.thursday...north winds 10 knots or less becoming northeast.
waves 1 foot or less. 
.friday...east winds 10 to 15 knots increasing to 15 to 20 knots.
a chance of showers friday night. waves 1 to 3 feet building to
3 to 5 feet. 
.saturday...east winds 15 to 20 knots becoming northeast 10 to
15 knots. showers likely. waves 3 to 5 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
403 am edt tue apr 21 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 30.4 inch high will settle southeast across the great 
lakes tonight, before sliding off the mid-atlantic coast tuesday. a 
29.4 inch low over lower hudson bay tuesday, will weaken to 29.9 
inches by wednesday, while pushing a cold front across the lake 
tuesday night. a 30.2 inch high will then build across the great 
lakes region wednesday and thursday. a warm front will approach the 
lake by friday. a 29.6 inch low may move southwest of the lake on 
saturday.


loz063>065-211500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 am edt tue apr 21 2026

.today...south winds 5 to 15 knots becoming southeast. waves 1 to
3 feet. 
.tonight...southeast winds 10 to 15 knots becoming south and
increasing to 15 to 25 knots. a chance of showers from late
evening on. waves 1 to 3 feet building to 3 to 5 feet, then
subsiding to 2 to 4 feet. 
.wednesday...east winds 10 knots or less becoming north. waves
2 feet or less. 
.wednesday night...northwest winds less than 10 knots. waves
1 foot or less. 
.thursday...northwest winds 10 knots or less becoming northeast.
waves 1 foot or less. 
.friday...northeast winds 5 to 15 knots becoming east 15 to
20 knots. a chance of rain showers friday night. waves 2 feet or
less building to 2 to 4 feet. 
.saturday...east winds 15 to 20 knots. showers likely. waves 3 to
5 feet subsiding to 2 to 4 feet. 

$$

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open lake forecast for lake erie
national weather service cleveland oh
403 am edt tue apr 21 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 and then be pushed back
south tonight into wednesday. high pressure 30.10 inches will
build from the north on wednesday night and remain in the region
through thursday. low pressure 29.50 inches will enter the
northwest great lakes on friday and slowly move southeast,
weakening to 29.70 inches over lake erie on saturday.


lez061-165>169-211430-
ripley to buffalo ny extending from 5nm off shoreline to us-
canadian border-
vermilion to avon point oh beyond 5 nm off shoreline to us-
canadian border-
avon point to willowick oh beyond 5 nm 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-
403 am edt tue apr 21 2026

.today...south winds 15 to 20 knots. waves 2 to 4 feet. 
.tonight...south winds 10 to 15 knots becoming west. a slight
chance of showers early, then a chance of showers with a slight
chance of thunderstorms. a slight chance of showers late. waves
1 to 3 feet building to 2 to 4 feet, then subsiding to 1 to
3 feet. 
.wednesday...northwest winds 10 knots or less becoming west.
waves 2 feet or less. 
.wednesday night...southwest winds less than 10 knots becoming
south. waves 1 foot or less. 
.thursday...east winds 10 knots or less. waves 1 foot or less. 
.friday...east winds 5 to 15 knots becoming northeast. showers
likely friday night. waves 2 feet or less. 
.saturday...northeast winds 5 to 15 knots. a chance of showers
during the day. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$