523
FZUS61 KBUF 210802
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
402 AM EDT Thu Aug 21 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 weak surface low of 30.0 inches over southern
Pennsylvania this morning will fade today as Hurricane Erin curves
north/northeastward, with center of the storm remaining well off the
North Carolina coastline. A 30.1 inch high will then build across
the Great Lakes region through Friday night. A 29.5 inch low will
move near the western shore of James Bay Saturday, and linger just
to the east of James Bay Sunday while pushing a cold front across
the lake Sunday night. A secondary frontal boundary will cross
Lake Ontario Monday.

LOZ062-211500-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
402 AM EDT Thu Aug 21 2025

.TODAY...Northeast winds 15 to 20 knots becoming east 10 to
15 knots. Waves 3 to 6 feet subsiding to 2 to 4 feet.
.TONIGHT...East winds 5 to 10 knots becoming north. Waves 1 to
3 feet subsiding to 1 foot or less.
.FRIDAY...North winds 10 knots or less becoming southwest. Waves
1 foot or less.
.FRIDAY NIGHT...South winds 10 knots or less becoming southwest.
Waves 1 foot or less.
.SATURDAY...Southwest winds 5 to 15 knots. Showers likely with a
chance of thunderstorms Saturday night. Waves 2 feet or less.
.SUNDAY...Southwest winds around 10 knots becoming west. Showers
likely during the day, then a chance of showers Sunday night.
Waves 1 to 2 feet.
.MONDAY...West winds 10 to 15 knots. A chance of showers. Waves
1 to 3 feet building to 2 to 4 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ063-211500-
Lake Ontario open waters from Hamlin Beach to Sodus Bay-
402 AM EDT Thu Aug 21 2025

.TODAY...East winds 15 to 20 knots becoming northeast 5 to
15 knots. Waves 3 to 5 feet subsiding to 1 to 3 feet.
.TONIGHT...North winds 5 to 10 knots becoming northeast. Waves
2 feet or less.
.FRIDAY...Northeast winds 5 to 10 knots becoming light and
variable. Waves 1 foot or less.
.FRIDAY NIGHT...Southwest winds 10 knots or less becoming south.
Waves 1 foot or less.
.SATURDAY...South winds 5 to 15 knots becoming southwest. Showers
with a chance of thunderstorms Saturday night. Waves 2 feet or
less.
.SUNDAY...Southwest winds 10 to 15 knots. Showers with a chance
of thunderstorms during the day, then a chance of showers and
thunderstorms Sunday night. Waves 1 to 2 feet.
.MONDAY...West winds 10 to 15 knots increasing to 15 to 20 knots.
A chance of showers. Waves 1 to 3 feet building to 2 to 4 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ064-065-211500-
Lake Ontario open waters from Sodus Bay to the Saint Lawrence
River-
402 AM EDT Thu Aug 21 2025

.TODAY...East winds 5 to 15 knots becoming north. Waves 1 to
3 feet.
.TONIGHT...Northwest winds 10 knots or less becoming northeast.
Waves 1 foot or less.
.FRIDAY...East winds less than 10 knots becoming west. Waves
1 foot or less.
.FRIDAY NIGHT...West winds 10 knots or less becoming south. Waves
1 foot or less.
.SATURDAY...South winds 5 to 15 knots increasing to 15 to
20 knots. Showers with a chance of thunderstorms Saturday night.
Waves 1 to 3 feet.
.SUNDAY...South winds 15 to 20 knots becoming southwest 5 to
15 knots. Showers with a chance of thunderstorms. Waves 1 to
3 feet.
.MONDAY...Southwest winds 10 to 15 knots becoming west. A chance
of showers. Waves 1 to 3 feet building to 2 to 4 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-211500-
MAFOR 2109/
ONTARIO WEST 1/2 11120 12220 11210 11200 11100 12800. Waves 3 to
6 feet subsiding to 2 to 4 feet today. Waves 1 to 3 feet
subsiding to 1 foot or less tonight.

ONTARIO EAST 1/2 12220 11210 11100 11800 11700 11800 11100. Waves
2 to 4 feet subsiding to 1 to 3 feet today. Waves 2 feet or less
tonight.

$$