fzus61 kbuf 220203
glflo 
expires:202605220900;;430127

open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt thu may 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 large 30.4 inch area of surface high pressure will 
build across the entire great lakes region tonight and friday, 
before sliding east off the new england coast late friday. this 
surface high will then strengthen to 30.6 inches as it anchors over 
atlantic canada through sunday. a 29.9 inch low an attendant warm 
front will then slowly approach the lake late friday night and 
saturday, before weakening and sliding eastward sunday. a 30.1 inch 
high will settle across the region monday through tuesday. a cold 
front associated with a 29.8 inch low over new england will drop 
south across the lake on wednesday.


loz062-220900-
lake ontario open waters from the niagara river to hamlin beach-
1002 pm edt thu may 21 2026

.overnight...northeast winds 10 knots or less becoming
east. waves 1 foot or less. 
.friday...east winds 10 to 15 knots increasing to 15 to 20 knots.
waves 1 to 3 feet building to 2 to 4 feet. 
.friday night...east winds 15 to 20 knots. a chance of showers
overnight. waves 2 to 4 feet. 
.saturday...east winds 15 to 25 knots. showers. waves 3 to 6 feet
building to 4 to 7 feet. waves occasionally around 9 feet. 
.saturday night...east winds 15 to 25 knots. showers. waves 5 to
8 feet. waves occasionally around 10 feet. 
.sunday...southeast winds 15 to 20 knots becoming southwest and
diminishing to less than 10 knots. showers during the day, then a
chance of showers sunday night. waves 3 to 6 feet subsiding to
2 feet or less. 
.monday...light and variable winds. a chance of showers during
the day. waves 1 foot or less. 
.tuesday...west winds less than 10 knots. waves 1 foot or less. 

$$

fzus61 kbuf 220203
glflo 
expires:202605220900;;430128

open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt thu may 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 large 30.4 inch area of surface high pressure will 
build across the entire great lakes region tonight and friday, 
before sliding east off the new england coast late friday. this 
surface high will then strengthen to 30.6 inches as it anchors over 
atlantic canada through sunday. a 29.9 inch low an attendant warm 
front will then slowly approach the lake late friday night and 
saturday, before weakening and sliding eastward sunday. a 30.1 inch 
high will settle across the region monday through tuesday. a cold 
front associated with a 29.8 inch low over new england will drop 
south across the lake on wednesday.


loz063>065-220900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt thu may 21 2026

.overnight...north winds 5 to 10 knots becoming northeast.
waves 1 foot or less. 
.friday...northeast winds 5 to 15 knots. waves 1 to 3 feet. 
.friday night...northeast winds 10 to 15 knots becoming east.
waves 1 to 3 feet. 
.saturday...east winds 10 to 15 knots becoming southeast and
increasing to 15 to 25 knots. showers. waves 1 to 3 feet building
to 3 to 5 feet. 
.saturday night...southeast winds 15 to 25 knots. showers. waves
3 to 6 feet. 
.sunday...southeast winds 15 to 25 knots becoming south. showers
during the day, then a chance of showers sunday night. waves 3 to
6 feet subsiding to 1 to 3 feet. 
.monday...southwest winds 5 to 10 knots becoming light and
variable. a chance of showers during the day. waves 2 feet or
less. 
.tuesday...west winds 10 knots or less. waves 1 foot or less. 

$$

fzus61 kbuf 220203
glfsl 
expires:202605220900;;430229

forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt thu may 21 2026


slz022-024-220900-
saint lawrence river from cape vincent to saint regis
1003 pm edt thu may 21 2026

.overnight...north winds less than 10 knots becoming
northeast. mainly clear. 
.friday...east winds 10 knots or less becoming northeast. sunny.
.friday night...northeast winds 10 knots or less becoming east.
partly cloudy in the evening, then becoming mostly cloudy. 
.saturday...east winds 10 knots or less becoming southeast. a
chance of showers in the afternoon. 
.saturday night...southeast winds 5 to 10 knots. showers.
.sunday...southeast winds 5 to 10 knots becoming south. showers
during the day, then a chance of showers sunday night. 
.monday...south winds less than 10 knots. a chance of showers
during the day. 
.tuesday...southwest winds 10 knots or less. partly cloudy. 

$$