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glfsl 
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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt thu aug 20 2026


slz022-024-210900-
saint lawrence river from cape vincent to saint regis
1003 pm edt thu aug 20 2026

.overnight...northeast winds 10 knots or less. mainly
clear. 
.friday...northeast winds less than 10 knots. sunny.
.friday night...light and variable winds. mainly clear. 
.saturday...light and variable winds. mostly sunny. 
.saturday night...southeast winds 10 knots or less. a chance of
showers in the evening, then showers likely overnight. 
.sunday...south winds 5 to 10 knots becoming southwest. showers
with a chance of thunderstorms. 
.monday...west winds 5 to 10 knots becoming southwest. showers
likely. 
.tuesday...southwest winds 10 knots or less. partly cloudy. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 210202
glflo 
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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt thu aug 20 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 ridge averaging 30.1 inches affects lake ontario through saturday 
as the embedded high pressure center moves from the upper great 
lakes toward the canadian maritimes. a warm front should sweep 
northward across lake ontario saturday night and a cold front should 
sweep eastward across the lake late saturday night through sunday as 
a low of 29.7 inches moves from the upper great lakes toward 
southern quebec. behind the low, a weak trough averaging 29.9 inches 
should linger over lake ontario through monday before a ridge 
averaging 30.0 inches builds from near the ohio valley on tuesday.


loz063>065-210900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt thu aug 20 2026

.overnight...northwest winds 5 to 15 knots becoming east.
waves 2 feet or less. 
.friday...east winds 10 knots or less becoming northeast. waves
1 foot or less. 
.friday night...northeast winds 5 to 10 knots becoming southeast.
waves 1 foot or less. 
.saturday...southeast winds 5 to 15 knots. a chance of showers
and thunderstorms in the afternoon. waves 2 feet or less. 
.saturday night...southeast winds 5 to 15 knots becoming south
15 to 20 knots. showers likely with a chance of thunderstorms in
the evening, then showers likely overnight. waves 1 to 3 feet. 
.sunday...southwest winds 15 to 20 knots becoming west. showers
with a chance of thunderstorms. waves 1 to 3 feet building to
2 to 4 feet. 
.monday...west winds 15 to 25 knots diminishing to 10 to
15 knots. showers likely during the day, then a chance of showers
monday night. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tuesday...west winds 5 to 15 knots becoming southwest. waves
1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$