fzus61 kbuf 042011
glfsl 
expires:202604050300;;836322

forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
410 pm edt sat apr 4 2026


slz022-024-050300-
saint lawrence river from cape vincent to saint regis
410 pm edt sat apr 4 2026

...small craft advisory in effect from sunday morning through
sunday evening...

.tonight...east winds 10 to 15 knots becoming south 15 to
20 knots. a chance of showers early. showers after midnight. 
.sunday...southwest winds 10 to 15 knots increasing to 15 to
20 knots. showers early, then a chance of showers from late
morning on. 
.sunday night...southwest winds 15 to 20 knots becoming west 5 to
15 knots. a chance of rain and snow showers. 
.monday...west winds 5 to 10 knots. a chance of snow showers. 
.monday night...west winds 10 knots or less becoming north. a
chance of snow showers in the evening, then snow showers likely
overnight. 
.tuesday...northwest winds 5 to 15 knots becoming southwest less
than 10 knots. snow showers likely during the day. 
.wednesday...southwest winds 10 knots or less becoming south and
increasing to 15 to 20 knots. mainly clear, then becoming partly
cloudy. 
.thursday...south winds 15 to 20 knots becoming southwest 5 to
15 knots. a chance of rain showers. 

$$

fzus61 kbuf 042009
glflo 
expires:202604050300;;835951

open lake forecast for lake ontario
national weather service buffalo ny
409 pm edt sat apr 4 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 29.4 inch surface low will track through the central 
great lakes this afternoon and evening before tracking into quebec 
tonight and sunday. with its track, a strong cold front will pass 
across the lake early tonight, with a secondary cold front then 
following sunday night and monday. a 30.5 inch high will then build 
across the great lakes tuesday and tuesday night, before sliding 
east and off the new england coast wednesday.


loz062-050300-
lake ontario open waters from the niagara river to hamlin beach-
409 pm edt sat apr 4 2026

.tonight...east winds 15 to 25 knots becoming southwest 15 to
20 knots. a chance of showers early, then showers with a chance
of thunderstorms. showers late. patchy fog after midnight. some
thunderstorms may produce gusty winds. waves 5 to 8 feet
subsiding to 3 to 6 feet. waves occasionally around 10 feet. 
.sunday...west winds 15 to 25 knots. waves 3 to 6 feet building
to 5 to 8 feet. waves occasionally around 10 feet. 
.sunday night...west winds 15 to 25 knots. waves 5 to 8 feet
subsiding to 3 to 6 feet. waves occasionally around 10 feet. 
.monday...west winds 15 to 20 knots diminishing to 10 to
15 knots. a chance of rain and snow showers in the afternoon.
waves 3 to 5 feet subsiding to 1 to 3 feet. 
.monday night...west winds 10 to 15 knots becoming northwest
15 to 20 knots. snow and rain showers. waves 1 to 3 feet building
to 3 to 5 feet. 
.tuesday...northwest winds 15 to 25 knots becoming west and
diminishing to 5 to 10 knots. snow showers during the day. waves
3 to 6 feet subsiding to 1 to 3 feet. 
.wednesday...south winds 5 to 10 knots increasing to 15 to
25 knots. waves 1 foot or less building to 3 to 6 feet. 
.thursday...southwest winds 15 to 25 knots becoming west. a
chance of showers. waves 4 to 7 feet subsiding to 3 to 6 feet.
waves occasionally around 9 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 042009
glflo 
expires:202604050300;;835952

open lake forecast for lake ontario
national weather service buffalo ny
409 pm edt sat apr 4 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 29.4 inch surface low will track through the central 
great lakes this afternoon and evening before tracking into quebec 
tonight and sunday. with its track, a strong cold front will pass 
across the lake early tonight, with a secondary cold front then 
following sunday night and monday. a 30.5 inch high will then build 
across the great lakes tuesday and tuesday night, before sliding 
east and off the new england coast wednesday.


loz063>065-050300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
409 pm edt sat apr 4 2026

.tonight...east winds 15 to 25 knots becoming southwest. a chance
of showers this evening, then showers after midnight. patchy fog
after midnight. waves 3 to 6 feet building to 5 to 8 feet. waves
occasionally around 10 feet. 
.sunday...west winds 15 to 25 knots increasing to 30 knots. rain
showers likely early. a chance of rain showers late. waves 3 to
6 feet building to 5 to 9 feet. waves occasionally around
11 feet. 
.sunday night...west winds 15 to 25 knots. a chance of rain
showers overnight. waves 6 to 9 feet. waves occasionally around
11 feet. 
.monday...west winds 15 to 20 knots diminishing to 10 to
15 knots. a chance of snow showers. waves 4 to 7 feet subsiding
to 1 to 3 feet. waves occasionally around 9 feet. 
.monday night...west winds 10 to 15 knots becoming north 15 to
20 knots. snow showers with rain showers likely. waves 1 to
3 feet building to 3 to 5 feet. 
.tuesday...north winds 15 to 25 knots becoming northwest and
diminishing to 10 to 15 knots. snow showers during the day. waves
3 to 6 feet subsiding to 2 to 4 feet. 
.wednesday...southwest winds 5 to 10 knots becoming south and
increasing to 30 knots. waves 1 to 3 feet building to 5 to
8 feet. waves occasionally around 10 feet. 
.thursday...south winds to 30 knots becoming southwest 15 to
25 knots. a chance of rain showers. waves 5 to 8 feet subsiding
to 3 to 6 feet. waves occasionally around 10 feet. 

winds and waves higher in and near thunderstorms.

$$