434
FZUS61 KBUF 182001
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
401 PM EDT Fri Apr 18 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 29.5 inch low over the upper Great Lakes will advance
to just north of the waters through Saturday, with its advancing
cold front moving across the lake tonight through Saturday. This
boundary will then stall out to the south of the lake Sunday,
meanwhile a 30.4 inch high will build across Lake Superior. A 29.5
inch low is then forecast to track from Missouri reaching the
Central Great Lakes Monday, then pass to the north the lake. A 30.2
inch high will then build into the lake beginning Tuesday.

LOZ062-190300-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
401 PM EDT Fri Apr 18 2025

.TONIGHT...South winds 10 to 15 knots becoming southwest 15 to
20 knots. A chance of showers this evening, then showers likely
with a chance of thunderstorms after midnight. Waves 1 to 2 feet
building to 3 to 5 feet.
.SATURDAY...Southwest winds 15 to 20 knots becoming west. Showers
likely with a chance of thunderstorms early, then a chance of
showers from late morning on. Waves 3 to 5 feet.
.SATURDAY NIGHT...West winds 15 to 20 knots becoming northwest
10 to 15 knots. Waves 2 to 4 feet.
.SUNDAY...Northwest winds 5 to 15 knots becoming southwest. Waves
1 to 3 feet subsiding to 1 foot or less.
.SUNDAY NIGHT...South winds 10 knots or less becoming east 10 to
15 knots. Waves 2 feet or less.
.MONDAY...East winds 15 to 20 knots becoming southwest. Showers.
Waves 3 to 5 feet.
.TUESDAY...West winds 15 to 20 knots diminishing to 5 to
10 knots. Waves 3 to 6 feet subsiding to 2 to 4 feet.
.WEDNESDAY...Northwest winds 5 to 10 knots becoming east. Waves
1 to 2 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ063>065-190300-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
401 PM EDT Fri Apr 18 2025

.TONIGHT...South winds 10 to 15 knots becoming southwest 15 to
20 knots. A chance of showers through the early overnight, then
showers likely with a chance of thunderstorms late. Waves 1 to
3 feet building to 2 to 4 feet.
.SATURDAY...Southwest winds 15 to 20 knots becoming west. Showers
likely with a chance of thunderstorms early, then showers likely.
A chance of showers late. Waves 3 to 5 feet.
.SATURDAY NIGHT...West winds 15 to 20 knots becoming northwest. A
chance of showers in the evening. Waves 3 to 6 feet.
.SUNDAY...Northwest winds 5 to 15 knots becoming west. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.SUNDAY NIGHT...Southwest winds 10 knots or less becoming east
10 to 15 knots. Waves 2 feet or less.
.MONDAY...East winds 15 to 20 knots becoming southwest. Rain
showers likely during the day, then rain showers Monday night.
Waves 1 to 3 feet building to 3 to 6 feet.
.TUESDAY...Southwest winds 15 to 25 knots becoming west and
diminishing to 10 to 15 knots. A chance of rain showers during
the day. Waves 3 to 6 feet.
.WEDNESDAY...West winds 5 to 10 knots becoming south. Waves 1 to
3 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-190300-
MAFOR 1821/
ONTARIO WEST 1/2 12410 11520 12526 12520 11620. A chance of
thunderstorms overnight and Saturday morning. Waves 1 to 3 feet
building to 3 to 5 feet tonight. Waves 3 to 5 feet Saturday.

ONTARIO EAST 1/2 14410 12526 11520 11620. Waves 1 to 3 feet
building to 2 to 4 feet tonight. Waves 3 to 5 feet Saturday.

$$