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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est thu nov 27 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 29.4 inch surface low over western quebec this evening 
will slowly track to central and eastern quebec through tomorrow. 
meanwhile, a 30.5 inch surface high will build south into the mid-
mississippi valley friday, then to the ohio valley and lower great 
lakes saturday. another surface low will cut northeastward through 
the central great lakes sunday, slowly deepening from 29.6 inches 
sunday morning to 29.4 inches sunday night over western quebec. a 
cold front from this low will cross the lake late sunday night.  a 
30.4 inch surface high centered over the central plains will then 
build east across the great lakes monday, sliding quickly to new 
england on tuesday.


loz064-065-280400-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 pm est thu nov 27 2025

...gale warning in effect through friday evening...

.tonight...west gales to 35 knots this evening. lake effect rain
and snow showers with a few rumbles of thunder possible through
the early overnight, then lake effect snow showers late. waves
12 to 17 feet subsiding to 10 to 15 feet. waves occasionally
around 22 feet. 
.friday...west winds to 30 knots increasing to 35 knot gales.
snow showers likely early, then a chance of snow showers from
late morning on. waves 10 to 15 feet. waves occasionally around
19 feet. 
.friday night...northwest winds to 30 knots. a chance of snow and
rain showers likely in the evening, then a chance of snow showers
overnight. waves 10 to 14 feet subsiding to 7 to 11 feet. waves
occasionally around 18 feet. 
.saturday...northwest winds 15 to 20 knots becoming west 5 to
15 knots. a chance of snow showers. waves 5 to 8 feet subsiding
to 1 to 3 feet. waves occasionally around 10 feet. 
.saturday night...west winds 10 knots or less becoming southeast
and increasing to 15 to 25 knots overnight. snow showers
overnight. waves 1 to 3 feet building to 3 to 5 feet. 
.sunday...south gales to 35 knots becoming southwest. rain and
snow showers. waves 6 to 10 feet building to 9 to 12 feet. waves
occasionally around 15 feet. 
.monday...northwest winds 15 to 25 knots becoming south and
diminishing to 5 to 15 knots. a chance of snow showers. waves
7 to 10 feet subsiding to 1 to 3 feet. waves occasionally around
13 feet. 
.tuesday...south winds 10 to 15 knots becoming north. a chance of
snow showers. waves 1 to 3 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est thu nov 27 2025


slz022-280400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est thu nov 27 2025

...small craft advisory in effect until 10 pm est this evening...

.tonight...southwest winds 15 to 25 knots becoming west. snow
showers likely early, then a chance of snow showers from late
evening on. 
.friday...west winds 15 to 20 knots. a chance of snow showers. 
.friday night...west winds 15 to 20 knots diminishing to 5 to
15 knots. mostly cloudy in the evening, then becoming partly
cloudy. 
.saturday...west winds 10 knots or less. mostly sunny. 
.saturday night...light and variable winds becoming southeast
5 to 10 knots. snow showers overnight. 
.sunday...south winds 10 to 15 knots becoming west. snow and rain
showers. 
.monday...northwest winds 10 knots or less becoming southeast. a
chance of snow showers. 
.tuesday...southeast winds 10 knots or less becoming north. a
chance of snow showers. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est thu nov 27 2025


slz024-280400-
saint lawrence river from ogdensburg to saint regis-
402 pm est thu nov 27 2025

...small craft advisory in effect until 10 pm est this evening...

.tonight...southwest winds 15 to 20 knots. a chance of snow
showers. 
.friday...west winds 15 to 20 knots. a chance of snow showers. 
.friday night...west winds 15 to 20 knots diminishing to 10 to
15 knots. mostly cloudy. 
.saturday...west winds 5 to 15 knots. mostly sunny. 
.saturday night...light and variable winds. snow showers likely
overnight. 
.sunday...southeast winds 5 to 15 knots becoming west. snow and
rain showers. 
.monday...west winds 10 to 15 knots becoming light and variable.
a chance of snow showers during the day. 
.tuesday...southeast winds less than 10 knots becoming north. a
chance of snow showers. 

$$