fzus61 kbuf 172004
glfsl 
expires:202607180300;;137244

forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt fri jul 17 2026


slz022-024-180300-
saint lawrence river from cape vincent to saint regis
403 pm edt fri jul 17 2026

.tonight...west winds 5 to 10 knots becoming southwest. areas of
smoke this evening. a chance of showers late. 
.saturday...south winds 10 to 15 knots becoming southwest.
showers likely early, then a chance of showers late in the
morning. showers with thunderstorms likely in the afternoon. some
thunderstorms may produce gusty winds in the afternoon. 
.saturday night...southwest winds 5 to 15 knots becoming
northwest. showers with a chance of thunderstorms in the evening.
some thunderstorms may produce gusty winds in the evening. 
.sunday...northwest winds 5 to 10 knots. sunny.
.sunday night...northwest winds 5 to 10 knots becoming light and
variable. mainly clear in the evening, then becoming partly
cloudy. 
.monday...southwest winds 5 to 15 knots becoming south. partly to
mostly cloudy. 
.tuesday...south winds 5 to 15 knots becoming southwest. showers
with a chance of thunderstorms. 
.wednesday...southwest winds 5 to 10 knots. showers likely with a
chance of thunderstorms. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 172003
glflo 
expires:202607180300;;137182

open lake forecast for lake ontario
national weather service buffalo ny
403 pm edt fri jul 17 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 30.0 inch ridge of high pressure will slide east of the lake this 
evening to the atlantic shoreline and in its wake a warm front will 
lift northeastward across the lake tonight through tomorrow morning. 
following this warm front a cold front will slice across the lake 
saturday afternoon and evening with this front attached to a 29.4 
inch area of low pressure crossing southern canada. a 30.0 inch area 
of high pressure will build across the great lakes region from west 
to east sunday into monday, followed by another cold front tuesday 
night with this front attached to a 29.5 inch area of low pressure 
near james bay. a secondary cold front will cross the lake 
wednesday.


loz063>065-180300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 pm edt fri jul 17 2026

.tonight...southeast winds 5 to 15 knots becoming south 15 to
20 knots. areas of smoke this evening. waves 1 foot or less
building to 1 to 3 feet. 
.saturday...south winds 15 to 25 knots becoming west. showers in
the morning, then showers with a chance of thunderstorms in the
afternoon. some thunderstorms may produce gusty winds in the
afternoon. waves 2 to 4 feet building to 3 to 6 feet. 
.saturday night...west winds 15 to 25 knots becoming northwest.
showers with a chance of thunderstorms in the evening. some
thunderstorms may produce gusty winds in the evening. waves 3 to
6 feet building to 4 to 7 feet, then subsiding to 3 to 6 feet.
waves occasionally around 9 feet. 
.sunday...northwest winds 15 to 20 knots becoming west 10 to
15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.sunday night...west winds 5 to 15 knots. waves 1 to 3 feet. 
.monday...southwest winds 5 to 15 knots becoming south 15 to
20 knots. a chance of showers monday night. waves 2 feet or less
building to 2 to 4 feet. 
.tuesday...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. 
.wednesday...west winds 15 to 25 knots. showers likely during the
day, then a chance of showers wednesday night. waves 4 to 7 feet
subsiding to 3 to 6 feet. waves occasionally around 9 feet. 

winds and waves higher in and near thunderstorms.

$$