FZUS61 KBUF 130809
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
409 AM EDT Mon Apr 13 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 29.3 inch low will move across northern Quebec today,
with a trailing weak trough crossing the lake. A 29.6 inch low will
then move into the central Great Lakes Tuesday morning before
weakening across the Saint Lawrence valley Tuesday night. Another
29.6 inch low will move into the central Great Lakes Wednesday night
before reaching southern Quebec Thursday night. A 30.0 inch high is
then forecast to build from the central Great Lakes Friday to the
lower Great Lakes Saturday.

LOZ062-131500-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
409 AM EDT Mon Apr 13 2026

.TODAY...Southwest winds 15 to 25 knots. Showers this morning.
Waves 2 to 4 feet building to 3 to 6 feet.
.TONIGHT...West winds 5 to 15 knots becoming southeast 10 knots
or less. A chance of showers late. Waves 2 to 4 feet subsiding to
1 foot or less.
.TUESDAY...East winds 5 to 10 knots becoming southwest and
increasing to 15 to 20 knots. Showers with a chance of
thunderstorms. Waves 2 feet or less building to 3 to 5 feet.
.TUESDAY NIGHT...Southwest winds 15 to 20 knots diminishing to
10 to 15 knots. Showers likely with a chance of thunderstorms.
Waves 3 to 5 feet subsiding to 1 to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots becoming south.
Showers likely with a chance of thunderstorms. Waves 1 to 2 feet.
.THURSDAY...South winds 10 to 15 knots becoming southwest 15 to
20 knots. Showers likely. Waves 1 to 3 feet.
.FRIDAY...West winds 5 to 15 knots becoming southeast. Waves 1 to
3 feet subsiding to 1 foot or less.

Winds and waves higher in and near thunderstorms.

$$

LOZ063>065-131500-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
409 AM EDT Mon Apr 13 2026

.TODAY...South winds 15 to 20 knots becoming southwest. Showers
through early afternoon. Waves 3 to 5 feet.
.TONIGHT...West winds 15 to 20 knots becoming south and
diminishing to less than 10 knots after midnight. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TUESDAY...Southeast winds 5 to 15 knots becoming southwest.
Showers in the morning, then showers with a chance of
thunderstorms in the afternoon. Waves 1 to 3 feet.
.TUESDAY NIGHT...Southwest winds 15 to 20 knots diminishing to
5 to 15 knots. Showers with a chance of thunderstorms. Waves 1 to
3 feet.
.WEDNESDAY...Southwest winds 5 to 10 knots becoming south.
Showers likely with a chance of thunderstorms during the day,
then showers likely Wednesday night. Waves 2 feet or less.
.THURSDAY...South winds 5 to 15 knots becoming southwest 15 to
20 knots. Showers likely. Waves 1 to 3 feet.
.FRIDAY...West winds 15 to 20 knots becoming south and
diminishing to 10 knots or less. A chance of showers during the
day. Waves 1 to 3 feet subsiding to 1 foot or less.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-131500-
MAFOR 1309/
ONTARIO WEST 1/2 11520 11536 12520 11510 11610 11600 11300. Waves
2 to 4 feet building to 3 to 6 feet today. Waves 2 to 4 feet
subsiding to 1 foot or less tonight.

ONTARIO EAST 1/2 11420 11426 11526 11520 11510 11610 11600 11500.
Waves 3 to 6 feet subsiding to 2 to 4 feet, then building to 3 to
5 feet today. Waves 2 to 4 feet subsiding to 1 to 3 feet tonight.

$$