fzus61 kbuf 180803
glflo 
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open lake forecast for lake ontario
national weather service buffalo ny
403 am 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 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.


loz062-181500-
lake ontario open waters from the niagara river to hamlin beach-
403 am edt sat jul 18 2026

.today...southwest winds 15 to 20 knots. patchy smoke early. a
chance of showers and thunderstorms this morning, then showers
with a chance of thunderstorms this afternoon. some thunderstorms
may produce gusty winds this afternoon. waves 1 to 3 feet
building to 3 to 5 feet. 
.tonight...west winds 15 to 20 knots becoming north 10 to
15 knots. waves 3 to 5 feet subsiding to 2 to 4 feet. 
.sunday...north winds 5 to 15 knots becoming west. waves 1 to
3 feet subsiding to 1 foot or less. 
.sunday night...west winds 10 knots or less. waves 1 foot or
less. 
.monday...southwest winds 10 knots or less becoming south 10 to
15 knots. a chance of showers monday night. waves 2 feet or less.
.tuesday...south winds 15 to 20 knots becoming west. showers with
a chance of thunderstorms. waves 2 to 4 feet. 
.wednesday...west winds 15 to 20 knots becoming northwest. a
chance of showers. waves 3 to 5 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 180803
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open lake forecast for lake ontario
national weather service buffalo ny
403 am 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 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>065-181500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 am edt sat jul 18 2026

.today...south winds 15 to 20 knots becoming southwest. showers
likely early, then showers with a chance of thunderstorms from
late morning on. areas of smoke. some thunderstorms may produce
gusty winds this afternoon. waves 1 to 3 feet building to 3 to
5 feet. 
.tonight...west winds 15 to 20 knots becoming north. a chance of
showers and thunderstorms early. some thunderstorms may produce
gusty winds early. waves 3 to 6 feet. 
.sunday...north winds 15 to 20 knots becoming west 5 to 15 knots.
waves 2 to 4 feet subsiding to 1 to 2 feet. 
.sunday night...west winds 5 to 15 knots. waves 1 to 2 feet. 
.monday...southwest winds 5 to 15 knots becoming south and
increasing to 15 to 25 knots. a chance of showers monday night.
waves 1 foot or less building to 3 to 5 feet. 
.tuesday...south winds 15 to 25 knots becoming west. showers with
a chance of thunderstorms. waves 3 to 6 feet subsiding to 3 to
5 feet. 
.wednesday...west winds 15 to 20 knots. a chance of showers and
thunderstorms. waves 3 to 6 feet. 

winds and waves higher in and near thunderstorms.

$$

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


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

.today...south winds 5 to 15 knots becoming southwest. showers
with a chance of thunderstorms. areas of smoke late this morning.
some thunderstorms may produce gusty winds this afternoon. 
.tonight...west winds 5 to 15 knots becoming northwest. showers
with a chance of thunderstorms early. 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...southwest winds 10 knots or less becoming south 10 to
15 knots. partly cloudy, then becoming mostly cloudy. 
.tuesday...south winds 15 to 20 knots becoming southwest 5 to
15 knots. showers with a chance of thunderstorms. 
.wednesday...southwest winds 5 to 10 knots becoming west. showers
likely with a chance of thunderstorms during the day, then a
chance of showers and thunderstorms wednesday night. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake erie
national weather service cleveland oh
400 am edt sat jul 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 29.70 inches enters the region as a cold front moves 
southeast across lake erie into tonight. as the cold front 
exits, high pressure 30.00 inches will briefly enter the region 
sunday and monday. a warm front will lift into the region 
monday and will be quickly followed by another cold front on
tuesday. a trough averaging 29.80 inches will linger across the 
eastern great lakes on wednesday.


lez061-166>169-181400-
ripley to buffalo ny extending from 5nm off shoreline to us-
canadian border-
avon point to willowick oh beyond 5 nm off shoreline to us-
canadian border-willowick to geneva-on-the-
lake oh beyond 5nm off shoreline to us-canadian border-geneva-on-
the-lake to conneaut oh beyond 5 nm off shoreline to us-
canadian border-
conneaut oh to ripley ny beyond 5 nm off shoreline to us-
canadian border-
400 am edt sat jul 18 2026

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

winds and waves higher in and near thunderstorms.

$$