937
FZUS61 KBUF 120809
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
409 AM EDT Tue May 12 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 30.3 inch high over the lower Great Lakes this morning
will drift to the eastern seaboard through tonight. A 29.7 inch low
over the central Great Lakes tonight will move to near the north
shore of Lake Ontario by Wednesday evening, then weaken into a
trough over eastern New York and New England Thursday. A 30.1 inch
high will then build from the central Great Lakes and Ohio Valley
Thursday night to the lower Great Lakes and Mid Atlantic Friday,
then off the Carolina coast Saturday.

LOZ062-121500-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
409 AM EDT Tue May 12 2026

.TODAY...East winds 10 knots or less. Waves 1 foot or less.
.TONIGHT...East winds 5 to 15 knots becoming southeast 15 to
20 knots. A chance of showers early, then showers from late
evening on. Waves 2 feet or less building to 2 to 3 feet.
.WEDNESDAY...South winds 15 to 20 knots becoming southwest.
Showers. Waves 2 to 4 feet.
.WEDNESDAY NIGHT...Southwest winds 10 to 15 knots becoming west.
A chance of showers in the evening. Waves 1 to 3 feet.
.THURSDAY...West winds 5 to 10 knots becoming northwest. Waves
2 feet or less.
.FRIDAY...Northwest winds 5 to 15 knots becoming southwest. Waves
1 to 2 feet.
.SATURDAY...Southwest winds 15 to 20 knots becoming west 10 to
15 knots. Waves 1 to 3 feet building to 2 to 4 feet, then
subsiding to 1 to 3 feet.

$$

LOZ063>065-121500-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
409 AM EDT Tue May 12 2026

.TODAY...North winds 10 knots or less becoming northeast. Waves
1 foot or less.
.TONIGHT...East winds 5 to 15 knots becoming southeast 15 to
20 knots. A chance of showers. Showers late. Waves 1 to 3 feet.
.WEDNESDAY...Southeast winds 15 to 25 knots becoming south.
Showers. Waves 3 to 6 feet subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots becoming west.
Showers in the evening, then a chance of showers overnight. Waves
1 to 3 feet.
.THURSDAY...West winds 5 to 10 knots becoming northwest. A chance
of showers during the day. Waves 2 feet or less.
.FRIDAY...Northwest winds 5 to 10 knots becoming southwest. Waves
2 feet or less.
.SATURDAY...South winds 10 to 15 knots becoming west. Waves 1 to
3 feet.

$$

LOZ061-121500-
MAFOR 1209/
ONTARIO WEST 1/2 11800 13100 12200 11216 11316. Waves 1 foot or
less today. Waves 2 feet or less building to 2 to 3 feet tonight.

ONTARIO EAST 1/2 12800 11600 11800 12200 11300 11310. A chance of
showers overnight. Waves 1 foot or less today. Waves 1 to 3 feet
tonight.

$$