151
FZUS61 KBUF 171402
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
1002 AM EDT Sun May 17 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 29.4 inch low over the upper Mississippi Valley today
will weaken to 29.7 inches as it moves northeast into the upper
Great Lakes tonight while swinging an attendant warm front across
the Lake. Another area of low pressure will develop over the Central
Plains Monday. The low will weaken from 29.4 inches to 29.6 inches
as it tracks northeast to the Upper Great Lakes Monday night into
Tuesday morning, then to central Quebec Wednesday while
strengthening to 29.4 inches. A cold front attendant to this low
will cross the Lake late Tuesday night into Wednesday morning. A
large 30.4 inch high will then build across the entire Great Lakes
region Wednesday night through Thursday.

LOZ062-172100-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
1002 AM EDT Sun May 17 2026

.THIS AFTERNOON...West winds 10 knots or less becoming east.
Patchy fog. Waves 1 foot or less.
.TONIGHT...Southeast winds 5 to 10 knots becoming east. A chance
of showers from late evening on. Waves 1 foot or less.
.MONDAY...East winds 10 knots or less becoming southwest and
increasing to 15 to 20 knots in the afternoon. Waves 1 to 3 feet.
.MONDAY NIGHT...Southwest winds 10 to 15 knots. A chance of
showers overnight. Waves 1 to 3 feet.
.TUESDAY...Southwest winds 15 to 25 knots. A chance of showers
during the day, then showers with a chance of thunderstorms
Tuesday night. Waves 2 to 4 feet building to 3 to 6 feet.
.WEDNESDAY...West winds 15 to 20 knots becoming northwest 10 to
15 knots. Showers likely during the day. Waves 3 to 5 feet
subsiding to 1 to 3 feet.
.THURSDAY...North winds 10 knots or less becoming northeast.
Waves 2 feet or less.

Winds and waves higher in and near thunderstorms.

$$

LOZ063>065-172100-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
1002 AM EDT Sun May 17 2026

.THIS AFTERNOON...West winds 10 knots or less becoming south.
Patchy fog. Waves 2 feet or less.
.TONIGHT...Southeast winds 10 knots or less becoming east. A
chance of showers late. Waves 1 foot or less.
.MONDAY...Southeast winds 5 to 10 knots becoming southwest. Waves
2 feet or less.
.MONDAY NIGHT...South winds 5 to 10 knots becoming southwest.
Waves 2 feet or less.
.TUESDAY...Southwest winds 10 to 15 knots increasing to 15 to
20 knots. Showers likely with a chance of thunderstorms Tuesday
night. Waves 1 to 3 feet building to 3 to 5 feet.
.WEDNESDAY...West winds 15 to 20 knots becoming northwest.
Showers likely with a chance of thunderstorms during the day.
Waves 3 to 6 feet.
.THURSDAY...North winds 5 to 15 knots diminishing to less than
10 knots. Waves 2 to 4 feet subsiding to 2 feet or less.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-172100-
MAFOR 1715/
ONTARIO WEST 1/2 11600 11700 14200 11200 11300. A chance of
showers tonight. Waves 1 foot or less.

ONTARIO EAST 1/2 11600 11500 11300 13200 12300. Waves 1 foot or
less.

$$