353
FZUS61 KBUF 200202
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
1002 PM EDT Sat Jul 19 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 29.7 inch low is forecast to move from the central
Great Lakes tonight to northern New England by late Sunday, with its
trailing cold front crossing the lake Sunday morning. A 30.1 inch
high over James Bay Sunday night will then build southward along the
Ontario/Quebec border through Monday night, before settling across
the Lower Great Lakes Tuesday, then off the southern New England
coast Wednesday. A 29.6 inch low may move south of James Bay
Thursday.

LOZ062-200900-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
1002 PM EDT Sat Jul 19 2025

.REST OF TONIGHT...South winds 5 to 15 knots becoming west. A
chance of showers and thunderstorms late this evening, then
showers with a chance of thunderstorms after midnight. Waves
2 feet or less.
.SUNDAY...West winds 5 to 15 knots becoming northwest. A chance
of showers early. Waves 1 to 2 feet.
.SUNDAY NIGHT...Northwest winds 15 to 20 knots becoming north.
Waves 1 to 3 feet building to 2 to 4 feet.
.MONDAY...North winds 5 to 15 knots becoming northwest less than
10 knots. Waves 1 to 3 feet subsiding to 1 foot or less.
.MONDAY NIGHT...Northwest winds 5 to 10 knots becoming northeast.
Waves 1 foot or less.
.TUESDAY...East winds 5 to 10 knots becoming southeast. Waves
1 foot or less.
.WEDNESDAY...Southeast winds 5 to 15 knots becoming southwest. A
chance of showers Wednesday night. Waves 2 feet or less.
.THURSDAY...Southwest winds 10 to 15 knots becoming west. A
chance of showers. Waves 1 to 3 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ063>065-200900-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
1002 PM EDT Sat Jul 19 2025

.REST OF TONIGHT...South winds 5 to 10 knots becoming southwest.
A chance of showers and thunderstorms after midnight. Showers
likely with a chance of thunderstorms late. Waves 2 feet or less.
.SUNDAY...West winds 10 to 15 knots becoming northwest. Showers
likely with a chance of thunderstorms early, then a chance of
showers and thunderstorms late in the morning. Waves 1 to 2 feet.
.SUNDAY NIGHT...Northwest winds 10 to 15 knots becoming north
15 to 20 knots. Waves 1 to 3 feet building to 3 to 5 feet.
.MONDAY...North winds 15 to 20 knots becoming northwest 5 to
15 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.MONDAY NIGHT...Northwest winds 5 to 10 knots becoming east.
Waves 1 foot or less.
.TUESDAY...East winds 10 knots or less becoming southeast. Waves
1 foot or less.
.WEDNESDAY...South winds 5 to 15 knots. A chance of showers
Wednesday night. Waves 1 to 3 feet.
.THURSDAY...Southwest winds 10 to 15 knots becoming west. A
chance of showers. Waves 1 to 3 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-200900-
MAFOR 2003/
ONTARIO WEST 1/2 11500 11616 12610 11710 11700 11710 11720. A
chance of thunderstorms overnight. Waves 2 feet or less overnight
and Sunday. Waves 1 to 3 feet building to 2 to 4 feet Sunday
evening.

ONTARIO EAST 1/2 11400 11500 11616 11610 11710 11700 11610 11720.
A chance of thunderstorms overnight and Sunday morning. Waves 2
feet or less overnight and Sunday. Waves 1 to 3 feet building to
2 to 4 feet Sunday evening.

$$