fzus61 kbuf 180805
glfsl 
expires:202604181500;;570145

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


slz022-024-181500-
saint lawrence river from cape vincent to saint regis
404 am edt sat apr 18 2026

.today...southeast winds 5 to 15 knots becoming south 15 to
20 knots. sunny this morning, then becoming partly sunny. 
.tonight...south winds 15 to 20 knots becoming west 10 to
15 knots. rain showers. 
.sunday...west winds 5 to 15 knots. rain showers with snow
showers likely in the morning, then a chance of rain showers in
the afternoon. 
.sunday night...west winds 5 to 15 knots becoming northwest. a
chance of rain showers in the evening. 
.monday...northwest winds 10 knots or less becoming south. partly
cloudy, then becoming mainly clear. 
.tuesday...south winds 5 to 10 knots becoming southwest. a chance
of rain showers. 
.wednesday...northwest winds 10 knots or less becoming north.
mostly cloudy, then clearing. 

$$

fzus61 kbuf 180804
glflo 
expires:202604181500;;570050

open lake forecast for lake ontario
national weather service buffalo ny
403 am edt sat apr 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 30.0 inch high will push northeast across the 
canadian maritimes today. meanwhile, a 29.4 inch low north of lake 
superior this morning will move to james bay and deepen to 29.0 
inches during the day, while pushing a trailing strong cold front 
across the lake this afternoon and evening. a 30.4 inch high will 
then settle southeastward across the great lakes sunday through 
monday night, before sliding off the mid-atlantic coast tuesday. a 
29.4 inch low over lower hudson bay tuesday, will weaken to 29.9 
inches by wednesday, while pushing an attendant weak cold front 
across the lake tuesday night. a 30.2 inch high will then build 
across the great lakes region wednesday and thursday.


loz063>065-181500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 am edt sat apr 18 2026

.today...southeast winds 15 to 20 knots becoming south. showers
likely late. waves 1 to 3 feet building to 3 to 5 feet. 
.tonight...southwest winds 15 to 20 knots becoming northwest
10 to 15 knots. rain showers with a chance of thunderstorms
early, then rain showers from late evening on. some thunderstorms
may produce gusty winds early. waves 3 to 5 feet subsiding to
2 to 4 feet. 
.sunday...west winds 10 to 15 knots increasing to 15 to 20 knots.
rain and snow showers likely in the morning, then a chance of
snow showers in the afternoon. waves 1 to 3 feet building to 3 to
6 feet. 
.sunday night...west winds 15 to 20 knots becoming northwest.
waves 3 to 6 feet. 
.monday...northwest winds 15 to 20 knots becoming west and
diminishing to 5 to 10 knots. waves 3 to 6 feet subsiding to 1 to
3 feet. 
.tuesday...south winds 10 to 15 knots becoming west. a chance of
rain showers. waves 1 to 3 feet. 
.wednesday...north winds 5 to 15 knots. waves 1 to 3 feet
subsiding to 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$