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open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt mon jun 30 2025

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 29.6 inch low will move from northwest ontario 
province today to east of hudson bay tuesday while deepening to 29.2 
inches. a cold front trailing this low will cross the lake tuesday 
morning. a 29.9 inch high will build into the upper great lakes 
wednesday and thursday. the high will then strengthen to 30.1 inches 
as it centers over the lake on friday.


loz062-302100-
lake ontario open waters from the niagara river to hamlin beach-
1002 am edt mon jun 30 2025

.this afternoon...east winds 10 knots or less. a chance of showers
and thunderstorms late. waves 1 foot or less. 
.tonight...southeast winds 5 to 10 knots becoming southwest.
showers with a chance of thunderstorms in the evening, then a
chance of showers and thunderstorms after midnight. waves 1 foot
or less. 
.tuesday...southwest winds 10 to 15 knots becoming west. a chance
of showers and thunderstorms in the morning. waves 1 to 2 feet. 
.tuesday night...west winds 10 to 15 knots. waves 1 to 2 feet. 
.wednesday...west winds 10 to 15 knots becoming southwest. waves
1 to 2 feet. 
.thursday...west winds 10 to 15 knots becoming northwest. waves
1 to 2 feet. 
.friday...northwest winds 5 to 10 knots becoming southwest. waves
1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 301402
glflo 
expires:202506302100;;642692

open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt mon jun 30 2025

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 29.6 inch low will move from northwest ontario 
province today to east of hudson bay tuesday while deepening to 29.2 
inches. a cold front trailing this low will cross the lake tuesday 
morning. a 29.9 inch high will build into the upper great lakes 
wednesday and thursday. the high will then strengthen to 30.1 inches 
as it centers over the lake on friday.


loz063>065-302100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt mon jun 30 2025

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

winds and waves higher in and near thunderstorms.

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 am edt mon jun 30 2025


slz022-024-302100-
saint lawrence river from cape vincent to saint regis
1002 am edt mon jun 30 2025

.this afternoon...southwest winds 10 knots or less. sunny.
.tonight...southwest winds 10 knots or less. showers likely late
in the evening. showers with a chance of thunderstorms after
midnight. 
.tuesday...southwest winds 5 to 10 knots. showers with a chance
of thunderstorms. 
.tuesday night...southwest winds 5 to 10 knots. showers likely
with a chance of thunderstorms in the evening. 
.wednesday...southwest winds 10 knots or less. mainly clear, then
becoming partly cloudy. 
.thursday...southwest winds 10 knots or less becoming northwest.
a chance of showers and thunderstorms. 
.friday...northwest winds less than 10 knots becoming southwest.
mainly clear, then becoming partly cloudy. 

winds and waves higher in and near thunderstorms.

$$