fzus61 kbuf 221727
glflo 
expires:202608222115;;176123

open lake forecast for lake ontario
national weather service buffalo ny
127 pm edt sat aug 22 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 30.1 inches exits toward 
the canadian maritimes today. elsewhere, a 29.6 inch low should 
wobble northeastward from the central great lakes to southwestern 
quebec through monday. in response to the low's track, a warm front 
drifts northeastward across lake ontario tonight and then a cold 
front sweeps eastward across the lake overnight tonight through 
sunday. behind the cold front, a trough averaging 29.8 inches 
lingers over lake ontario through monday. on tuesday through 
wednesday, a ridge averaging 30.1 inches builds from the western and 
central great lakes. the ridge should begin to exit eastward on 
thursday and allow a warm front to sweep northeastward across lake 
ontario.


loz062-222115-
lake ontario open waters from the niagara river to hamlin beach-
127 pm edt sat aug 22 2026

...severe thunderstorm watch 614 in effect until 9 pm edt this
evening...

.this afternoon...east winds 10 knots or less. a chance of showers
and thunderstorms late. waves around 1 foot. 
.tonight...east winds 5 to 15 knots becoming south. showers with
a chance of thunderstorms. waves 1 to 2 feet. 
.sunday...southwest winds 15 to 20 knots becoming west. showers
likely in the morning, then showers with a chance of
thunderstorms in the afternoon. waves 1 to 3 feet building to
3 to 6 feet. 
.sunday night...west winds 15 to 20 knots. showers likely with a
chance of thunderstorms in the evening, then a chance of showers
overnight. waves 4 to 6 feet. 
.monday...southwest winds 15 to 25 knots becoming west. showers
during the day, then showers likely monday night. waves 5 to
8 feet subsiding to 3 to 5 feet. waves occasionally around
10 feet. 
.tuesday...west winds 15 to 20 knots diminishing to 10 knots or
less. waves 2 to 4 feet subsiding to 1 foot or less. 
.wednesday...southwest winds 10 knots or less becoming south.
waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 221727
glflo 
expires:202608222115;;176124

open lake forecast for lake ontario
national weather service buffalo ny
127 pm edt sat aug 22 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 30.1 inches exits toward 
the canadian maritimes today. elsewhere, a 29.6 inch low should 
wobble northeastward from the central great lakes to southwestern 
quebec through monday. in response to the low's track, a warm front 
drifts northeastward across lake ontario tonight and then a cold 
front sweeps eastward across the lake overnight tonight through 
sunday. behind the cold front, a trough averaging 29.8 inches 
lingers over lake ontario through monday. on tuesday through 
wednesday, a ridge averaging 30.1 inches builds from the western and 
central great lakes. the ridge should begin to exit eastward on 
thursday and allow a warm front to sweep northeastward across lake 
ontario.


loz063>065-222115-
lake ontario open waters from hamlin beach to the saint lawrence
river-
127 pm edt sat aug 22 2026

.this afternoon...southeast winds 5 to 10 knots. waves 2 feet or
less. 
.tonight...southeast winds 5 to 10 knots becoming south and
increasing to 15 to 25 knots after midnight. showers with a
chance of thunderstorms. waves 1 to 3 feet building to 3 to
5 feet. 
.sunday...south winds 15 to 25 knots becoming west. showers with
a chance of thunderstorms. waves 3 to 5 feet building to 3 to
6 feet. 
.sunday night...west winds 15 to 20 knots becoming southwest.
showers likely with a chance of thunderstorms in the evening,
then showers overnight. waves 3 to 6 feet building to 4 to
7 feet. waves occasionally around 9 feet. 
.monday...southwest winds 15 to 25 knots becoming west. showers.
waves 4 to 7 feet building to 6 to 9 feet, then subsiding to 4 to
7 feet. waves occasionally around 11 feet. 
.tuesday...west winds 15 to 20 knots diminishing to 5 to
15 knots. a chance of showers during the day. waves 3 to 6 feet
subsiding to 1 to 3 feet. 
.wednesday...west winds 5 to 15 knots becoming south. waves
2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 221403
glfsl 
expires:202608222100;;168754

forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 am edt sat aug 22 2026


slz022-024-222100-
saint lawrence river from cape vincent to saint regis
1002 am edt sat aug 22 2026

.this afternoon...southeast winds 5 to 10 knots. mostly sunny. 
.tonight...southeast winds 10 knots or less increasing to 10 to
15 knots. a chance of showers after midnight. a chance of showers
and thunderstorms late. 
.sunday...southeast winds 5 to 15 knots becoming southwest.
showers with a chance of thunderstorms. 
.sunday night...southwest winds 5 to 15 knots. showers likely
with a chance of thunderstorms in the evening, then showers
likely overnight. 
.monday...southwest winds 5 to 15 knots. showers.
.tuesday...west winds 5 to 10 knots becoming light and variable.
a chance of showers. 
.wednesday...southwest winds 10 knots or less becoming south.
partly cloudy. 

winds and waves higher in and near thunderstorms.

$$