703
FZUS61 KBUF 122002
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
402 PM EDT Sat Jul 12 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 north of Lake Superior will make its way
to James Bay tonight while deepening to 29.3 inches. The low will
then lift north across Hudson Bay and into northern Quebec
Sunday...while slowly dragging its trailing cold front across the
lake late Sunday and Sunday night. A 30.1 inch high will slowly
drift from the Upper Midwest to New England Monday through
Wednesday...then a 29.7 inch low will track northeastward across the
Great Lakes and into Quebec Wednesday night and Thursday.

LOZ062-130300-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
402 PM EDT Sat Jul 12 2025

.TONIGHT...Southeast winds 5 to 10 knots becoming southwest. A
chance of showers after midnight. A chance of showers and
thunderstorms late. Waves 1 to 2 feet.
.SUNDAY...Southwest winds 5 to 10 knots becoming west. A chance
of showers and thunderstorms. Waves 1 to 2 feet.
.SUNDAY NIGHT...West winds 5 to 10 knots. A chance of showers and
thunderstorms in the evening. Waves 1 foot or less.
.MONDAY...West winds 10 knots or less becoming southwest. Waves
1 foot or less.
.MONDAY NIGHT...Southwest winds 5 to 10 knots. Waves 2 feet or
less.
.TUESDAY...Southwest winds 10 knots or less. Waves 1 foot or
less.
.WEDNESDAY...Southwest winds 10 knots or less becoming south. A
chance of showers Wednesday night. Waves 1 foot or less.
.THURSDAY...Southwest winds 10 to 15 knots. A chance of showers.
Waves 1 to 2 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ063>065-130300-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
402 PM EDT Sat Jul 12 2025

.TONIGHT...East winds 5 to 15 knots becoming south. A chance of
showers after midnight. A chance of showers and thunderstorms
late. Waves 1 to 3 feet.
.SUNDAY...South winds 5 to 15 knots becoming southwest. A chance
of showers and thunderstorms in the morning, then showers with a
chance of thunderstorms in the afternoon. Waves 1 to 3 feet
subsiding to 1 foot or less.
.SUNDAY NIGHT...South winds 5 to 10 knots becoming west. A chance
of showers and thunderstorms in the evening, then a chance of
showers overnight. Waves 1 foot or less.
.MONDAY...West winds 10 knots or less becoming southwest. Waves
1 foot or less.
.MONDAY NIGHT...Southwest winds 5 to 10 knots. Waves 1 foot or
less.
.TUESDAY...Southwest winds 10 knots or less becoming south. Waves
1 foot or less.
.WEDNESDAY...South winds 5 to 10 knots. A chance of showers
Wednesday night. Waves 2 feet or less.
.THURSDAY...Southwest winds 5 to 10 knots becoming west. Showers
likely with a chance of thunderstorms. Waves 1 to 2 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-130300-
MAFOR 1221/
ONTARIO WEST 1/2 11200 11300 12400 12500 12600. A chance of
showers overnight. A chance of showers and thunderstorms Sunday.
Waves 1 to 2 feet.

ONTARIO EAST 1/2 11200 11300 11310 13410 11500 11606. A chance of
thunderstorms Sunday. Waves 1 to 3 feet.

$$