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


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

.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 early, then a chance of rain and snow showers late
in the morning. 
.sunday night...west winds 5 to 15 knots becoming northwest.
partly to mostly cloudy. 
.monday...northwest winds 5 to 10 knots. partly sunny. 
.monday night...west winds less than 10 knots becoming south.
becoming mainly clear. 
.tuesday...south winds 5 to 10 knots becoming southwest. a chance
of rain showers. 
.wednesday...northwest winds 10 knots or less. mostly cloudy,
then clearing. 
.thursday...northwest winds less than 10 knots becoming north.
partly to mostly cloudy. 

$$

fzus61 kbuf 182009
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open lake forecast for lake ontario
national weather service buffalo ny
409 pm 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 29.5 inch low east of lake superior this afternoon 
will move to james bay and deepen to 29.0 inches, while pushing a 
trailing strong cold front across the lake this afternoon and 
evening. a 30.4 inch high will then settle southeast 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. a warm front will then approach the lake by friday.


loz062-190300-
lake ontario open waters from the niagara river to hamlin beach-
409 pm edt sat apr 18 2026

.tonight...west winds 15 to 20 knots becoming northwest 10 to
15 knots. rain showers early, then a chance of rain showers. a
chance of rain and snow showers late. waves 2 to 3 feet. 
.sunday...west winds 10 to 15 knots increasing to 15 to 20 knots.
a chance of rain showers late. waves 2 to 4 feet. 
.sunday night...west winds 15 to 20 knots becoming northwest. a
chance of rain showers in the evening. waves 2 to 4 feet. 
.monday...northwest winds 15 to 20 knots becoming west 10 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.monday night...northwest winds 5 to 15 knots becoming southwest.
waves 1 to 3 feet. 
.tuesday...south winds 15 to 20 knots becoming west 10 to
15 knots. waves 1 to 3 feet. 
.wednesday...north winds 10 knots or less. waves 1 foot or less. 
.thursday...northeast winds 10 knots or less becoming east. waves
1 foot or less. 

$$

fzus61 kbuf 182009
glflo 
expires:202604190300;;598719

open lake forecast for lake ontario
national weather service buffalo ny
409 pm 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 29.5 inch low east of lake superior this afternoon 
will move to james bay and deepen to 29.0 inches, while pushing a 
trailing strong cold front across the lake this afternoon and 
evening. a 30.4 inch high will then settle southeast 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. a warm front will then approach the lake by friday.


loz063>065-190300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
409 pm edt sat apr 18 2026

.tonight...southwest winds 15 to 20 knots becoming northwest
10 to 15 knots. rain showers this evening, then rain showers
likely after midnight. rain showers late. 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 early. waves 2 to 4 feet building to
3 to 5 feet. 
.sunday night...west winds 15 to 20 knots. waves 3 to 6 feet. 
.monday...northwest winds 15 to 20 knots becoming west. waves
3 to 5 feet subsiding to 2 to 4 feet. 
.monday night...west winds 15 to 20 knots diminishing to 5 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tuesday...south winds 10 to 15 knots. waves 1 to 2 feet. 
.wednesday...north winds 5 to 15 knots becoming northwest. waves
2 feet or less. 
.thursday...north winds 10 knots or less becoming east. waves
1 foot or less. 

$$

fzus61 kcle 181950
glfle 
expires:202604190230;;597633

open lake forecast for lake erie
national weather service cleveland oh
350 pm edt sat apr 18 2026

for waters beyond five nautical miles of shore on lake erie

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...
low pressure 29.40 inches lifts into quebec tonight, dragging a
cold front east of the region. a trough averaging 29.90 inches 
moves across the lake sunday afternoon before high pressure 30.40
inches moves overhead sunday night into monday. another cold front
will cross the lake tuesday night or early wednesday before high 
pressure returns wednesday and thursday. 


lez061-169-190230-
ripley to buffalo ny extending from 5nm off shoreline to us-
canadian border-
conneaut oh to ripley ny beyond 5 nm off shoreline to us-
canadian border-
350 pm edt sat apr 18 2026

.tonight...west winds 10 to 15 knots. a chance of rain showers
with a slight chance of thunderstorms early, then a chance of
rain showers from late evening on. waves 2 to 4 feet. 
.sunday...west winds 10 to 15 knots increasing to 15 to 20 knots.
a slight chance of rain and snow showers late. waves 2 to 4 feet.
.sunday night...west winds 15 to 20 knots becoming northwest
10 to 15 knots. a chance of rain and snow showers in the evening.
waves 2 to 4 feet subsiding to 1 to 2 feet. 
.monday...northwest winds around 10 knots becoming west. waves
1 to 2 feet. 
.monday night...west winds 10 knots or less becoming south. waves
around 1 foot. 
.tuesday...south winds 5 to 15 knots becoming southwest. waves
1 to 2 feet. 
.wednesday...north winds 5 to 10 knots becoming light and
variable. waves 2 feet or less. 
.thursday...east winds 10 knots or less becoming southeast. waves
1 foot or less. 

winds and waves higher in and near thunderstorms.

$$