FZUS61 KBUF 121410
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
1009 AM EDT Sun Apr 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 30.5 inch area of high pressure will drift east
into New England today, before sliding off the coast tonight. A 29.4
inch low over the upper Midwest today, will move quickly
northeastward to near James Bay tonight, while pushing an attendant
warm front across the Lake this afternoon. This low will strengthen
to 29.2 inches while continuing to trek northeast into northern
Quebec Monday, with a trailing cold front stalling near the Lake
Monday through Tuesday. A 29.5 inch surface low advancing through
the upper Great Lakes Wednesday will lift this frontal boundary
northward into Canada. This 29.5 inch low will continue northeast
into southern Quebec on Thursday while dragging an attendant cold
front across the Lake. A 30.2 inch high will then build over the
lower Great Lakes on Friday.

LOZ062-122100-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
1010 AM EDT Sun Apr 12 2026

.REST OF TODAY...East winds 10 to 15 knots. A chance of rain
showers late this morning, then rain showers this afternoon.
Waves 1 to 2 feet.
.TONIGHT...East winds 10 to 15 knots becoming southwest and
increasing to 15 to 25 knots. A chance of showers in the evening.
A chance of showers late. Waves 1 to 3 feet building to 3 to
5 feet.
.MONDAY...Southwest winds 15 to 25 knots. Showers. Waves 3 to
6 feet.
.MONDAY NIGHT...Southwest winds 15 to 20 knots diminishing to
10 to 15 knots. Showers likely overnight. Waves 3 to 5 feet
subsiding to 1 to 3 feet.
.TUESDAY...South winds 15 to 20 knots becoming southwest 10 to
15 knots. Showers likely with a chance of thunderstorms. Waves
1 to 3 feet building to 3 to 5 feet, then subsiding to 1 to
3 feet.
.WEDNESDAY...Southwest winds 10 to 15 knots. Showers likely with
a chance of thunderstorms during the day, then showers likely
Wednesday night. Waves 1 to 2 feet.
.THURSDAY...South winds 15 to 20 knots becoming west 10 to
15 knots. Showers likely. Waves 1 to 3 feet building to 2 to
4 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ063>065-122100-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
1010 AM EDT Sun Apr 12 2026

.REST OF TODAY...Southeast winds 10 to 15 knots. A chance of rain
showers early this afternoon. Rain showers late. Waves 2 feet or
less.
.TONIGHT...Southeast winds 15 to 25 knots becoming south. Showers
likely early, then a chance of showers late in the evening. A
chance of showers late. Waves 1 to 3 feet building to 4 to
7 feet. Waves occasionally around 9 feet.
.MONDAY...Southwest winds 15 to 25 knots. Showers. Waves 3 to
6 feet.
.MONDAY NIGHT...Southwest winds 15 to 20 knots becoming south
5 to 15 knots. A chance of showers. Waves 3 to 5 feet subsiding
to 1 to 3 feet.
.TUESDAY...South winds 10 to 15 knots becoming southwest. Showers
with a chance of thunderstorms. Waves 1 to 2 feet building to
2 to 4 feet, then subsiding to 1 to 3 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots. Showers likely. Waves
2 feet or less.
.THURSDAY...South winds 15 to 20 knots becoming west. Showers
likely. Waves 1 to 3 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-122100-
MAFOR 1215/
ONTARIO WEST 1/2 11200 11216 11210 11310 12520 12536. Waves 1 to
2 feet this afternoon. Waves 1 to 3 feet building to 3 to 5 feet
tonight. Waves 3 to 6 feet Monday morning.

ONTARIO EAST 1/2 12310 11326 11330 13430 11526. Waves 2 feet or
less this afternoon. Waves 1 to 3 feet building to 4 to 7 feet,
and occasionally around 9 feet tonight. Waves 3 to 6 feet Monday
morning.

$$