900
FZUS61 KBUF 132003
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
402 PM EDT Wed Aug 13 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 29.2 inch low over northern Quebec this afternoon
will continue to progress northeast, allowing for its trailing cold
front will cross the lake today. A 30.1 inch high will then build
from northwest Ontario province Thursday to Quebec and New England
Friday and Saturday, before a 29.8 inch wave of low pressure and
cold front move across the lake Sunday. A 30.2 inch surface high
will then ridge southward across the lake Monday.

LOZ062-140300-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
402 PM EDT Wed Aug 13 2025

.TONIGHT...West winds 5 to 15 knots becoming north. Waves 2 feet
or less.
.THURSDAY...North winds 5 to 15 knots becoming southwest less
than 10 knots. Waves 2 feet or less.
.THURSDAY NIGHT...Northwest winds 10 knots or less becoming east.
Waves 1 foot or less.
.FRIDAY...East winds 5 to 10 knots. Waves 1 to 2 feet.
.FRIDAY NIGHT...East winds 5 to 10 knots becoming south. Waves
1 foot or less.
.SATURDAY...Southwest winds 10 knots or less. A chance of showers
and thunderstorms Saturday night. Waves 2 feet or less.
.SUNDAY...West winds 10 to 15 knots becoming northeast 15 to
20 knots. A chance of showers and thunderstorms. Waves 1 to
2 feet building to 2 to 4 feet.
.MONDAY...Northeast winds 15 to 20 knots becoming east 5 to
15 knots. Waves 3 to 5 feet subsiding to 1 to 2 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ063>065-140300-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
402 PM EDT Wed Aug 13 2025

.TONIGHT...West winds 5 to 15 knots becoming north. Waves 2 feet
or less.
.THURSDAY...North winds 5 to 15 knots. Waves 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 5 to 10 knots becoming
northeast. Waves 2 feet or less.
.FRIDAY...East winds 5 to 10 knots becoming northeast. Waves
2 feet or less.
.FRIDAY NIGHT...East winds 10 knots or less becoming south. Waves
1 foot or less.
.SATURDAY...South winds 5 to 10 knots becoming southwest. Waves
2 feet or less.
.SUNDAY...West winds 10 to 15 knots becoming northeast 15 to
20 knots. A chance of showers and thunderstorms. Waves 1 to
3 feet building to 3 to 5 feet.
.MONDAY...Northeast winds 15 to 20 knots becoming east 10 to
15 knots. Waves 3 to 5 feet subsiding to 1 to 3 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-140300-
MAFOR 1321/
ONTARIO WEST 1/2 11600 12710 12810 11110 12100. Waves 2 feet or
less.

ONTARIO EAST 1/2 12600 11700 12810 11110 11810 11800. Waves 2
feet or less tonight. Waves 1 to 3 feet Thursday.

$$