fzus61 kbuf 092003
glflo 
expires:202608100300;;898605

open lake forecast for lake ontario
national weather service buffalo ny
403 pm edt sun aug 9 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 high pressure ridge averaging 30.3 inches begins to 
exit tonight. on the backside of the ridge, a warm front sweeps 
northeastward across lake ontario tonight into monday morning. a 
cold front then sweeps eastward across the lake monday evening. 
behind the cold front, a trough averaging 29.8 inches should linger 
over the eastern great lakes through thursday. by this friday, a 
high pressure ridge averaging 30.0 inches should build from the 
upper great lakes.


loz063>065-100300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 pm edt sun aug 9 2026

.tonight...northwest winds 5 to 15 knots becoming south. waves
2 feet or less. 
.monday...south winds 10 to 15 knots becoming west. showers
likely with a chance of thunderstorms in the morning, then a
chance of showers and thunderstorms in the afternoon. waves 1 to
2 feet. 
.monday night...west winds 10 to 15 knots becoming northwest. a
chance of showers in the evening. waves 1 to 2 feet. 
.tuesday...northwest winds 5 to 15 knots becoming west. waves
1 to 2 feet. 
.tuesday night...west winds 5 to 10 knots. waves 2 feet or less. 
.wednesday...west winds 10 knots or less. a chance of showers
during the day, then showers likely with a chance of
thunderstorms wednesday night. waves 1 foot or less. 
.thursday...northwest winds 10 to 15 knots. a chance of showers
during the day. waves 1 to 3 feet. 
.friday...northwest winds 5 to 10 knots becoming north. waves
1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 092003
glfsl 
expires:202608100300;;898679

forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt sun aug 9 2026


slz022-024-100300-
saint lawrence river from cape vincent to saint regis
403 pm edt sun aug 9 2026

.tonight...west winds 10 knots or less becoming south. partly
cloudy this evening, then becoming mostly cloudy. 
.monday...south winds 5 to 10 knots becoming southwest. a chance
of showers early, then showers likely late in the morning.
showers with a chance of thunderstorms in the afternoon. 
.monday night...southwest winds 10 knots or less becoming west.
showers likely with a chance of thunderstorms in the evening,
then a chance of showers overnight. 
.tuesday...west winds 10 knots or less. partly to mostly sunny. 
.tuesday night...southwest winds 5 to 10 knots becoming light and
variable. partly cloudy. 
.wednesday...southwest winds less than 10 knots. a chance of
showers during the day, then showers likely with a chance of
thunderstorms wednesday night. 
.thursday...west winds 10 knots or less. showers likely with a
chance of thunderstorms. 
.friday...northwest winds 5 to 10 knots becoming light and
variable. becoming mainly clear. 

winds and waves higher in and near thunderstorms.

$$