725
FZUS61 KBUF 120902
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
402 AM EST Wed Nov 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 28.2 inch low will slowly advance northwards across
Newfoundland today. Meanwhile, a weak 29.5 inch wave of low pressure
will cross the Great Lakes. Another 29.2 inch low will develop south
of Nova Scotia Thursday, then move north across the Canadian
Maritimes Friday, remaining in place through Saturday. Meanwhile, a
30.1 inch high will then build from northwest Ontario province
Friday to James Bay and the lower Great Lakes by Saturday.

LOZ062-121600-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
402 AM EST Wed Nov 12 2025

.TODAY...Southwest winds to 30 knots becoming west. Lake effect
rain this morning, then rain showers likely this afternoon. Waves
4 to 7 feet building to 6 to 9 feet. Waves occasionally around
11 feet.
.TONIGHT...West winds to 30 knots. A chance of showers early,
then showers from late evening on. Waves 6 to 9 feet. Waves
occasionally around 11 feet.
.THURSDAY...West winds 20 to 25 knots. Showers likely. Waves 5 to
8 feet. Waves occasionally around 10 feet.
.THURSDAY NIGHT...West winds 15 to 20 knots. Showers likely in
the evening, then a chance of showers overnight. Waves 3 to
6 feet subsiding to 2 to 4 feet.
.FRIDAY...Northwest winds 5 to 15 knots becoming northeast. A
chance of rain showers during the day. Waves 2 to 4 feet
subsiding to 1 to 3 feet.
.SATURDAY...Southeast winds 5 to 15 knots becoming west 15 to
20 knots. A chance of rain showers during the day, then rain
Saturday night. Waves 2 feet or less building to 2 to 4 feet.
.SUNDAY...West winds to 30 knots. Rain during the day, then rain
likely with a chance of snow Sunday night. Waves 5 to 8 feet
building to 7 to 11 feet, then subsiding to 6 to 9 feet. Waves
occasionally around 14 feet.

$$

LOZ063-121600-
Lake Ontario open waters from Hamlin Beach to Sodus Bay-
402 AM EST Wed Nov 12 2025

.TODAY...Southwest winds to 30 knots becoming west. Lake effect
rain and snow early, then lake effect rain from late morning on.
Waves 5 to 8 feet building to 6 to 10 feet. Waves occasionally
around 13 feet.
.TONIGHT...West winds to 30 knots. Lake effect showers. Waves
6 to 10 feet. Waves occasionally around 13 feet.
.THURSDAY...West winds 20 to 25 knots. Showers. Waves 6 to
9 feet. Waves occasionally around 11 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots. Showers likely.
Waves 5 to 8 feet subsiding to 3 to 5 feet. Waves occasionally
around 10 feet.
.FRIDAY...Northwest winds 15 to 20 knots becoming north 5 to
15 knots. A chance of rain showers during the day. Waves 3 to
5 feet subsiding to 1 to 3 feet.
.SATURDAY...Southeast winds 5 to 15 knots becoming southwest
15 to 20 knots. A chance of rain showers during the day, then
rain Saturday night. Waves 1 to 3 feet building to 3 to 5 feet.
.SUNDAY...West winds to 30 knots becoming northwest. Rain during
the day, then rain likely with a chance of snow Sunday night.
Waves 7 to 10 feet building to 9 to 13 feet. Waves occasionally
around 16 feet.

$$

LOZ064-065-121600-
Lake Ontario open waters from Sodus Bay to the Saint Lawrence
River-
402 AM EST Wed Nov 12 2025

.TODAY...Southwest winds to 30 knots becoming west. Lake effect
rain with lake effect snow showers likely early, then lake effect
rain from late morning on. Waves 5 to 9 feet building to 7 to
10 feet. Waves occasionally around 13 feet.
.TONIGHT...West winds to 30 knots becoming northwest. Rain
showers likely early, then a chance of rain showers from late
evening on. Waves 6 to 10 feet. Waves occasionally around
13 feet.
.THURSDAY...Northwest winds 15 to 25 knots becoming west. Rain
showers. Waves 5 to 9 feet. Waves occasionally around 11 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots. Rain showers.
Waves 5 to 8 feet subsiding to 3 to 6 feet. Waves occasionally
around 10 feet.
.FRIDAY...Northwest winds 5 to 15 knots becoming north. Rain
showers likely during the day, then a chance of rain and snow
showers Friday night. Waves 3 to 5 feet subsiding to 1 to 3 feet.
.SATURDAY...East winds 5 to 10 knots becoming south and
increasing to 15 to 20 knots. A chance of rain showers during the
day, then rain Saturday night. Waves 1 foot or less building to
3 to 5 feet.
.SUNDAY...West winds to 30 knots becoming northwest. Rain during
the day, then rain with snow likely Sunday night. Waves 7 to
10 feet building to 9 to 13 feet. Waves occasionally around
16 feet.

$$

LOZ061-121600-
MAFOR 1210/
ONTARIO WEST 1/2 11537 11536 11636 11646 11640 11630 12636. Waves
5 to 8 feet building to 6 to 9 feet, and occasionally around 11
feet today. Waves 6 to 10 feet, and occasionally around 13 feet
tonight.

ONTARIO EAST 1/2 11547 12536 12636 11640 11730 11736. Waves 6 to
10 feet subsiding to 5 to 9 feet, then building to 7 to 10 feet,
and occasionally around 13 feet today. Waves 6 to 10 feet, and
occasionally around 13 feet tonight.

$$