143
FZUS61 KBUF 192002
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
402 PM EDT Wed Aug 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 high averaging 30.1 inches over the upper Great
Lakes tonight, will build across the lower Great Lakes, then into
New England by Friday night. The high will then move into the
Canadian Maritimes Saturday, while an elongated 29.7 inch low slowly
makes its way from the central Great Lakes to western Quebec
Saturday and Sunday, then wobbles about western Quebec through at
least Monday.

LOZ062-200300-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
402 PM EDT Wed Aug 19 2026

.TONIGHT...North winds 5 to 15 knots. Waves 2 feet or less.
.THURSDAY...North winds less than 10 knots. Waves 1 foot or less.
.THURSDAY NIGHT...West winds less than 10 knots becoming north.
Waves 1 foot or less.
.FRIDAY...Northeast winds 10 knots or less becoming east. Waves
1 foot or less.
.FRIDAY NIGHT...East winds 5 to 10 knots becoming southeast.
Waves 2 feet or less.
.SATURDAY...Southeast winds 5 to 10 knots becoming west. Showers
likely with a chance of thunderstorms. Waves 2 feet or less.
.SUNDAY...West winds 10 to 15 knots. A chance of showers. Waves
2 to 3 feet.
.MONDAY...West winds 15 to 20 knots diminishing to 10 to
15 knots. Waves 1 to 3 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ063>065-200300-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
402 PM EDT Wed Aug 19 2026

.TONIGHT...West winds 5 to 15 knots becoming northwest. Waves
1 to 2 feet.
.THURSDAY...Northwest winds 10 knots or less becoming west. Waves
1 foot or less.
.THURSDAY NIGHT...West winds 10 knots or less becoming northwest.
Waves 1 foot or less.
.FRIDAY...Southeast winds 10 knots or less becoming northeast.
Waves 1 foot or less.
.FRIDAY NIGHT...Northeast winds 5 to 10 knots becoming southeast.
Waves 1 foot or less.
.SATURDAY...Southeast winds 5 to 15 knots becoming southwest.
Showers with a chance of thunderstorms. Waves 1 to 3 feet.
.SUNDAY...West winds 10 to 15 knots. Showers likely with a chance
of thunderstorms during the day, then a chance of showers Sunday
night. Waves 1 to 3 feet building to 2 to 4 feet.
.MONDAY...West winds 15 to 20 knots diminishing to 10 to
15 knots. A chance of showers during the day. Waves 2 to 4 feet
subsiding to 1 to 3 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-200300-
MAFOR 1921/
ONTARIO WEST 1/2 11610 11710 11800 11700 13800 11600. Waves 2
feet or less.

ONTARIO EAST 1/2 12610 11710 13700 12600. Waves 1 to 3 feet
tonight. Waves 1 foot or less Thursday.

$$