fzus61 kbuf 182004
glfsl 
expires:202607190300;;193788

forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
404 pm edt sat jul 18 2026


slz022-024-190300-
saint lawrence river from cape vincent to saint regis
404 pm edt sat jul 18 2026

.tonight...southwest winds 5 to 15 knots becoming northwest.
showers and thunderstorms early, then a chance of showers late
this evening. some thunderstorms may produce gusty winds early. 
.sunday...northwest winds 5 to 10 knots. sunny.
.sunday night...northwest winds 5 to 10 knots becoming light and
variable. mainly clear. 
.monday...light and variable winds becoming southwest 5 to
10 knots. mostly sunny. 
.monday night...southwest winds 10 knots or less becoming south.
mostly cloudy. 
.tuesday...south winds 5 to 15 knots. showers with a chance of
thunderstorms. 
.wednesday...southwest winds 5 to 15 knots becoming west. showers
likely during the day, then a chance of showers wednesday night. 
.thursday...west winds 5 to 10 knots becoming light and variable.
becoming mainly clear. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 182003
glflo 
expires:202607190300;;193639

open lake forecast for lake ontario
national weather service buffalo ny
403 pm edt sat jul 18 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 cold front will slice across the lake this afternoon, followed by 
a secondary cold front crossing the lake overnight, with both fronts 
attached to a 29.4 inch area of low pressure crossing southeastern 
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 
a warm front crossing the lake monday night and another cold front 
tuesday night, with these fronts attached to a 29.4 inch area of low 
pressure near james bay. a secondary cold front will cross the lake 
wednesday, with a 30.1 inch high building across the lower great 
lakes region wednesday night through friday.


loz065-190300-
lake ontario open waters from mexico bay to the saint lawrence
river-
403 pm edt sat jul 18 2026

.tonight...southwest winds 15 to 25 knots becoming north. a
chance of showers and thunderstorms early, then a chance of
showers late this evening. waves 4 to 7 feet subsiding to 3 to
6 feet. waves occasionally around 9 feet. 
.sunday...north winds 15 to 20 knots becoming west 10 to
15 knots. waves 2 to 4 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 10 knots. waves 1 foot or less. 
.monday night...south winds 10 knots or less increasing to 15 to
20 knots. waves 1 to 3 feet. 
.tuesday...south winds 15 to 20 knots becoming southwest. showers
with a chance of thunderstorms. waves 2 to 4 feet. 
.wednesday...west winds 15 to 20 knots. showers likely during the
day, then a chance of showers wednesday night. waves 3 to 5 feet
building to 4 to 7 feet, then subsiding to 3 to 6 feet. waves
occasionally around 9 feet. 
.thursday...northwest winds 5 to 15 knots becoming southwest.
waves 2 to 4 feet subsiding to 1 to 2 feet. 

winds and waves higher in and near thunderstorms.

$$