488
FZUS61 KBUF 052002
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
402 PM EDT Tue May 5 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 29.2 inch low over Hudson Bay this evening will weaken
to 29.3 inches as it moves to northern Quebec through Wednesday. A
trailing wavy cold front will slowly cross the lake through tonight,
then drift across New England Wednesday and out to sea Thursday. A
30.1 inch high over the Tennessee and Ohio Valleys Thursday night
will slide to the mid-Atlantic coastline Friday. A 29.6 inch low
will track across the lake early Saturday, followed by a 29.7 inch
low that will track near or just south of the lake for later Sunday.

LOZ062-060300-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
402 PM EDT Tue May 5 2026

.TONIGHT...Southwest winds 15 to 25 knots becoming east and
diminishing to 5 to 10 knots after midnight. Showers with a
chance of thunderstorms early, then showers from late evening on.
Waves 3 to 6 feet subsiding to 1 to 2 feet.
.WEDNESDAY...East winds 10 knots or less becoming southwest.
Showers early, then a chance of showers late in the morning.
Waves 1 foot or less.
.WEDNESDAY NIGHT...West winds 5 to 10 knots becoming northwest.
Waves 1 foot or less.
.THURSDAY...West winds 5 to 10 knots. Waves 1 foot or less.
.THURSDAY NIGHT...West winds 5 to 10 knots. Waves around 1 foot.
.FRIDAY...West winds 5 to 10 knots becoming southwest. A chance
of showers Friday night. Waves 1 to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots. A chance of showers.
Waves 1 to 2 feet.
.SUNDAY...Southwest winds 5 to 10 knots becoming northwest. A
chance of showers. Waves 1 to 2 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ063>065-060300-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
402 PM EDT Tue May 5 2026

.TONIGHT...West winds 15 to 25 knots becoming southeast and
diminishing to 10 knots or less after midnight. Showers likely
with a chance of thunderstorms early, then showers late this
evening. Rain after midnight. Waves 4 to 7 feet subsiding to 1 to
3 feet. Waves occasionally around 9 feet.
.WEDNESDAY...Northeast winds 5 to 10 knots becoming west. Rain
early, then showers likely late in the morning. Waves 2 feet or
less.
.WEDNESDAY NIGHT...West winds 5 to 10 knots. Waves 2 feet or
less.
.THURSDAY...West winds 5 to 15 knots. Waves 1 to 2 feet.
.THURSDAY NIGHT...West winds 10 to 15 knots. Waves 1 to 2 feet.
.FRIDAY...West winds 5 to 15 knots becoming south. A chance of
showers Friday night. Waves 2 feet or less.
.SATURDAY...South winds 5 to 15 knots becoming southwest. A
chance of showers. Waves 1 to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots becoming northwest. A
chance of showers. Waves 1 to 2 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-060300-
MAFOR 0521/
ONTARIO WEST 1/2 11636 11506 11406 11306 11206 11200 11100 11600.
A chance of thunderstorms this evening. Waves 3 to 6 feet
subsiding to 1 to 2 feet tonight. Waves 1 foot or less Wednesday.

ONTARIO EAST 1/2 11630 11616 11406 11306 11206 11106 11800 11700.
A chance of thunderstorms this evening. Waves 3 to 6 feet
building to 4 to 7 feet, then subsiding to 1 to 3 feet, and
occasionally around 9 feet tonight. Waves 2 feet or less
Wednesday.

$$