221
FZUS61 KBUF 190202
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
1002 PM EDT Wed Jun 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...
Low pressure deepening to 29.5 inches will push across the central
Great Lakes overnight and into southern Quebec on Thursday, and will
push a trailing cold front across the lake during Thursday. A 30.1
inch high will then build northeast across the lake Friday, before
exiting east of the lake Saturday. While a complex of thunderstorms
may dive southeastward near or across the lake Saturday night, the
30.2 inch surface high will remain anchored over the east coast
Sunday.

LOZ062-190900-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
1002 PM EDT Wed Jun 18 2025

.REST OF TONIGHT...South winds 10 knots or less becoming
southeast. A chance of showers late this evening, then showers
with a chance of thunderstorms after midnight. Waves 2 feet or
less.
.THURSDAY...South winds 15 to 25 knots becoming west. A chance of
showers and thunderstorms early, then a chance of showers late in
the morning. Waves 2 to 4 feet building to 5 to 7 feet. Waves
occasionally around 9 feet.
.THURSDAY NIGHT...West winds 15 to 20 knots diminishing to 10 to
15 knots. Waves 4 to 7 feet subsiding to 2 to 4 feet. Waves
occasionally around 9 feet.
.FRIDAY...West winds 10 to 15 knots becoming southwest. A chance
of showers and thunderstorms in the afternoon. Waves 1 to 3 feet.
.FRIDAY NIGHT...Southwest winds 10 to 15 knots. A chance of
showers and thunderstorms in the evening, then a chance of
showers overnight. Waves 1 to 2 feet.
.SATURDAY...Southwest winds 10 to 15 knots increasing to 15 to
20 knots. A chance of showers during the day, then a chance of
showers and thunderstorms Saturday night. Waves 1 to 3 feet
building to 2 to 4 feet.
.SUNDAY...Southwest winds 10 to 15 knots. A chance of showers
during the day. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.MONDAY...Southwest winds 10 to 15 knots. Waves 2 to 4 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ063>065-190900-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
1002 PM EDT Wed Jun 18 2025

.REST OF TONIGHT...South winds 10 knots or less. A chance of
showers after midnight. Showers likely with a chance of
thunderstorms late. Waves 1 foot or less.
.THURSDAY...South winds 10 to 15 knots becoming west and
increasing to 15 to 25 knots. A chance of showers and
thunderstorms early, then showers with a chance of thunderstorms.
A chance of showers and thunderstorms late. Some thunderstorms
may produce gusty winds in the afternoon. Waves 1 to 3 feet
building to 3 to 6 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots. A chance of showers.
Waves 5 to 8 feet subsiding to 3 to 6 feet. Waves occasionally
around 10 feet.
.FRIDAY...West winds 10 to 15 knots. Waves 3 to 5 feet subsiding
to 1 to 3 feet.
.FRIDAY NIGHT...Southwest winds 5 to 10 knots. A chance of
showers overnight. Waves 1 to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots increasing to 15 to
20 knots. A chance of showers during the day, then showers likely
with a chance of thunderstorms Saturday night. Waves 1 to 3 feet.
.SUNDAY...Southwest winds 5 to 15 knots. A chance of showers and
thunderstorms during the day. Waves 1 to 3 feet.
.MONDAY...Southwest winds 10 to 15 knots. Waves 1 to 3 feet.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-190900-
MAFOR 1903/
ONTARIO WEST 1/2 11400 11406 11420 12530 12630 11620. A chance of
thunderstorms overnight and Thursday morning. Waves 2 feet or
less overnight. Waves 2 to 4 feet building to 4 to 7 feet, and
occasionally around 9 feet Thursday. Waves 4 to 7 feet subsiding
to 3 to 6 feet, and occasionally around 9 feet Thursday evening.

ONTARIO EAST 1/2 12400 11410 11420 11526 11520 12630. Waves 1
foot or less overnight. Waves 1 to 3 feet building to 3 to 6 feet
Thursday. Waves 5 to 8 feet, and occasionally around 10 feet
Thursday evening.

$$