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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt mon sep 7 2026


slz022-024-071500-
saint lawrence river from cape vincent to saint regis
403 am edt mon sep 7 2026

.today...light and variable winds becoming northwest 5 to
10 knots. sunny.
.tonight...west winds less than 10 knots becoming northwest.
partly cloudy through the early overnight, then becoming mostly
cloudy. 
.tuesday...north winds less than 10 knots. partly sunny in the
morning, then becoming mostly cloudy. 
.tuesday night...light and variable winds becoming south 5 to
10 knots. cloudy.
.wednesday...south winds 10 to 15 knots becoming southwest 15 to
20 knots. showers.
.thursday...west winds 5 to 15 knots becoming northwest. partly
to mostly cloudy. 
.friday...west winds 10 knots or less becoming south. mainly
clear. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt mon sep 7 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 30.2 inch high will settle over the lower great lakes 
today this high will then drift to the eastern seaboard tuesday, 
then east of the mid atlantic coast by wednesday. meanwhile, a 29.3 
inch low over far northwest ontario province tuesday night will move 
to hudson bay by late wednesday, then to northern quebec by thursday 
while deepening to 29.0 inches. a trailing cold front will cross the 
lower great lakes wednesday night. a 30.0 inch high will build 
across the eastern great lakes region thursday through friday.


loz063>065-071500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt mon sep 7 2026

.today...northwest winds 5 to 15 knots becoming west. waves
2 feet or less. 
.tonight...west winds 5 to 15 knots. waves 2 feet or less. 
.tuesday...west winds 10 knots or less becoming north. waves
1 foot or less. 
.tuesday night...east winds 5 to 15 knots becoming south. waves
2 feet or less. 
.wednesday...south winds 15 to 25 knots becoming southwest.
showers. waves 1 to 3 feet building to 4 to 7 feet, then
subsiding to 3 to 6 feet. waves occasionally around 9 feet. 
.thursday...west winds 15 to 20 knots becoming northwest. a
chance of showers during the day. waves 4 to 7 feet subsiding to
3 to 5 feet. waves occasionally around 9 feet. 
.friday...northwest winds 5 to 15 knots becoming south. waves
2 to 4 feet subsiding to 1 to 3 feet. 

$$