fzus61 kbuf 192003
glflo 
expires:202607200300;;250250

open lake forecast for lake ontario
national weather service buffalo ny
403 pm edt sun jul 19 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 area of high pressure will build across the great lakes 
from west to east through 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.


loz063>065-200300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 pm edt sun jul 19 2026

.tonight...west winds 5 to 15 knots. waves 1 to 3 feet. 
.monday...southwest winds 5 to 10 knots becoming southeast. waves
2 feet or less. 
.monday night...southeast winds 5 to 10 knots becoming south and
increasing to 15 to 20 knots. waves 1 foot or less building to
2 to 4 feet. 
.tuesday...south winds 15 to 25 knots. showers with a chance of
thunderstorms. waves 3 to 5 feet. 
.tuesday night...southwest winds 15 to 20 knots becoming west.
showers with a chance of thunderstorms. waves 2 to 4 feet
building to 3 to 5 feet. 
.wednesday...west winds 15 to 25 knots becoming northwest.
showers likely with a chance of thunderstorms during the day.
waves 5 to 8 feet subsiding to 3 to 6 feet. waves occasionally
around 10 feet. 
.thursday...west winds 5 to 15 knots becoming southwest. waves
2 to 4 feet subsiding to 1 foot or less. 
.friday...southwest winds 5 to 10 knots becoming northwest. waves
1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 192003
glfsl 
expires:202607200300;;250402

forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt sun jul 19 2026


slz022-024-200300-
saint lawrence river from cape vincent to saint regis
403 pm edt sun jul 19 2026

.tonight...west winds 5 to 10 knots becoming light and variable.
mainly clear. 
.monday...light and variable winds becoming southwest around
10 knots. sunny.
.monday night...southwest winds 10 knots or less becoming south
10 to 15 knots. mostly cloudy. 
.tuesday...south winds 10 to 15 knots. a chance of showers in the
morning, then showers with a chance of thunderstorms in the
afternoon. 
.tuesday night...south winds 10 to 15 knots becoming southwest.
showers with a chance of thunderstorms in the evening, then
showers overnight. 
.wednesday...southwest winds 5 to 15 knots becoming west. showers
likely with a chance of thunderstorms during the day, then a
chance of showers and thunderstorms wednesday night. 
.thursday...west winds 10 knots or less becoming southwest.
mainly clear. 
.friday...southwest winds 10 knots or less becoming west. mainly
clear, then becoming partly cloudy. 

winds and waves higher in and near thunderstorms.

$$