635
FZUS61 KBUF 120802
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
402 AM EDT Sun Oct 12 2025

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 29.6 inch low just offshore of the Carolinas today
will move north to just offshore of the Delmarva Monday. Meanwhile,
a 30.5 inch high will remain in place over the Canadian Maritimes
through Monday. The east coast low will move east into the Atlantic
Tuesday, while a ridge of high pressure averaging 30.2 inches
building into the lower Great Lakes. A cold front will move south
across the lake Tuesday night. An expansive 30.3 inch high will then
build from the upper Great Lakes Wednesday to Quebec and the lower
Great Lakes by Thursday night.

LOZ062-121500-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
402 AM EDT Sun Oct 12 2025

.TODAY...East winds 15 to 20 knots. Waves 2 to 4 feet building to
3 to 5 feet.
.TONIGHT...East winds 15 to 20 knots. Waves 3 to 5 feet.
.MONDAY...East winds 15 to 20 knots becoming northeast. Waves
2 to 4 feet.
.MONDAY NIGHT...East winds 5 to 15 knots becoming northeast.
Waves 2 to 4 feet subsiding to 1 to 2 feet.
.TUESDAY...North winds 5 to 10 knots increasing to 15 to
20 knots. Waves 2 feet or less building to 3 to 5 feet.
.WEDNESDAY...North winds 15 to 20 knots. Waves 3 to 5 feet
subsiding to 2 to 4 feet.
.THURSDAY...North winds 15 to 20 knots diminishing to 10 to
15 knots. Waves 2 to 4 feet subsiding to 1 to 2 feet.

$$

LOZ063>065-121500-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
402 AM EDT Sun Oct 12 2025

.TODAY...East winds 10 to 15 knots increasing to 15 to 20 knots.
Waves 1 to 3 feet.
.TONIGHT...East winds 15 to 20 knots diminishing to 10 to
15 knots. A chance of showers late. Waves 2 to 4 feet.
.MONDAY...Northeast winds 10 to 15 knots increasing to 15 to
20 knots. A chance of showers. Waves 1 to 3 feet building to 3 to
5 feet.
.MONDAY NIGHT...Northeast winds 15 to 20 knots diminishing to
5 to 15 knots. A chance of showers. Waves 3 to 5 feet subsiding
to 1 to 3 feet.
.TUESDAY...North winds 5 to 10 knots increasing to 15 to
25 knots. Waves 2 feet or less building to 3 to 6 feet.
.WEDNESDAY...North winds 15 to 25 knots. Waves 3 to 6 feet.
.THURSDAY...North winds 15 to 20 knots. Waves 3 to 5 feet
subsiding to 1 to 3 feet.

$$

LOZ061-121500-
MAFOR 1209/
ONTARIO WEST 1/2 12210 14220 11210 11220. Waves 2 to 4 feet
building to 3 to 5 feet today. Waves 3 to 5 feet tonight.

ONTARIO EAST 1/2 13210 11110 12220 12210. Waves 1 to 3 feet
today. Waves 2 to 4 feet subsiding to 1 to 3 feet tonight.

$$