428
FZUS61 KBUF 130202
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
1002 PM EDT Sat Sep 12 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 pressure ridge averaging 30.0 inches continues
to exit eastward and allows a wavy warm front to sweep northeastward
across the lake this evening. A cold front then sweeps eastward
across the lake on Sunday. Behind the cold front, a ridge averaging
30.2 inches will slide eastward across the Lower Great Lakes through
Monday. The ridge should exit toward New England on Tuesday and
allow a warm front to sweep northeastward across the lake. A cold
front should sweep eastward across the lake on Wednesday and be
followed by a ridge averaging 30.1 inches and building from the
Upper Midwest through Thursday.

LOZ062-130900-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
1002 PM EDT Sat Sep 12 2026

.OVERNIGHT...South winds 10 to 15 knots becoming southwest.
Waves 1 to 3 feet.
.SUNDAY...West winds 5 to 15 knots. Waves 1 to 2 feet.
.SUNDAY NIGHT...Northwest winds 15 to 20 knots. A chance of
showers in the evening. Waves 1 to 3 feet building to 3 to
5 feet, then subsiding to 2 to 4 feet.
.MONDAY...North winds 15 to 20 knots becoming west and
diminishing to less than 10 knots in the afternoon. Waves 2 to
4 feet subsiding to 1 foot or less.
.MONDAY NIGHT...West winds 10 knots or less becoming south. Waves
1 foot or less.
.TUESDAY...South winds 5 to 15 knots becoming southwest. A chance
of showers Tuesday night. Waves 2 feet or less.
.WEDNESDAY...West winds 10 knots or less becoming east. A chance
of showers. Waves 1 foot or less.
.THURSDAY...East winds 5 to 15 knots becoming north. Showers
likely during the day, then a chance of showers Thursday night.
Waves 2 feet or less.

$$

LOZ063>065-130900-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
1002 PM EDT Sat Sep 12 2026

.OVERNIGHT...South winds 15 to 20 knots becoming southwest.
Showers likely with a chance of thunderstorms, then a chance of
showers late. Waves 2 to 4 feet.
.SUNDAY...Southwest winds 10 to 15 knots becoming west. A chance
of showers early. A chance of showers late. Waves 1 to 3 feet.
.SUNDAY NIGHT...West winds 15 to 20 knots becoming northwest. A
chance of showers. Waves 2 to 4 feet building to 3 to 5 feet.
.MONDAY...Northwest winds 15 to 20 knots diminishing to 5 to
15 knots. Waves 3 to 5 feet subsiding to 1 to 3 feet.
.MONDAY NIGHT...Northwest winds 5 to 10 knots becoming south.
Waves 1 foot or less.
.TUESDAY...South winds 15 to 25 knots. A chance of showers
Tuesday night. Waves 1 to 3 feet building to 2 to 4 feet.
.WEDNESDAY...Southwest winds 15 to 20 knots becoming east and
diminishing to 10 knots or less. A chance of showers. Waves 1 to
3 feet subsiding to 1 foot or less.
.THURSDAY...Southeast winds 5 to 15 knots becoming north 15 to
20 knots. Showers likely. Waves 2 feet or less.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-130900-
MAFOR 1303/
ONTARIO WEST 1/2 11410 12510 11610 11600 12610 11720. A chance of
showers Sunday evening. Waves 1 to 3 feet overnight and Sunday.
Waves 1 to 3 feet building to 3 to 5 feet Sunday evening.

ONTARIO EAST 1/2 12420 12510 13610 11720. A chance of showers and
thunderstorms late this evening, then a chance of showers
overnight. Waves 2 to 4 feet overnight. Waves 1 to 3 feet Sunday.
Waves 2 to 4 feet Sunday evening.

$$