542
FZUS61 KBUF 050902
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
402 AM EST Wed Nov 5 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 over the Upper Great Lakes will deepen
to 29.5 inches and pass along or just north of the north shore of
the lake today, then will make its way across New England tonight
while further strengthening to 29.1 inches. In its wake, a 30.3 inch
high will build from the Ohio Valley to mid-Atlantic states
Thursday, then will slide out to sea through Friday while allowing a
29.4 inch low to track from the Upper Great Lakes to Quebec and push
its trailing cold front across the lake Friday night. Another 29.7
inch surface low will then track from the Ohio Valley to New England
Sunday and Monday while deepening to 29.5 inches.

LOZ062-051600-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
402 AM EST Wed Nov 5 2025

...GALE WARNING IN EFFECT FROM 1 PM EST THIS AFTERNOON THROUGH
LATE TONIGHT...

.TODAY...South winds 15 to 25 knots becoming west and increasing
to 35 knot gales this afternoon. A chance of showers early, then
showers from late morning on. Waves 1 to 2 feet building to 9 to
12 feet. Waves occasionally around 15 feet.
.TONIGHT...Northwest gales to 35 knots diminishing to 30 knots.
Showers through the early overnight, then a chance of showers
late. Waves 10 to 14 feet subsiding to 7 to 11 feet. Waves
occasionally around 18 feet.
.THURSDAY...Northwest winds 15 to 25 knots becoming west. Waves
5 to 8 feet subsiding to 2 to 4 feet. Waves occasionally around
10 feet.
.THURSDAY NIGHT...West winds 10 to 15 knots becoming south. Waves
1 to 3 feet.
.FRIDAY...South winds 15 to 25 knots becoming west. Showers.
Waves 3 to 6 feet.
.SATURDAY...Northwest winds 15 to 20 knots becoming northeast
10 to 15 knots. A chance of showers during the day, then showers
likely Saturday night. Waves 3 to 5 feet subsiding to 1 to
3 feet.
.SUNDAY...Northeast winds 15 to 20 knots becoming northwest. Rain
showers likely during the day, then rain showers likely with a
chance of snow showers Sunday night. Waves 3 to 5 feet.

$$

LOZ063>065-051600-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
402 AM EST Wed Nov 5 2025

...GALE WARNING IN EFFECT FROM 1 PM EST THIS AFTERNOON THROUGH
LATE TONIGHT...

.TODAY...South winds 10 to 15 knots becoming southwest and
increasing to 35 knot gales this afternoon. A chance of showers
late this morning. Showers this afternoon. Waves 1 to 3 feet
building to 9 to 12 feet. Waves occasionally around 15 feet.
.TONIGHT...West gales to 40 knots becoming northwest and
diminishing to 30 knots after midnight. Rain showers through the
early overnight, then a chance of rain showers late. Waves 12 to
17 feet subsiding to 9 to 12 feet. Waves occasionally around
22 feet.
.THURSDAY...Northwest winds 15 to 25 knots becoming west. Waves
7 to 10 feet subsiding to 3 to 6 feet. Waves occasionally around
13 feet.
.THURSDAY NIGHT...West winds 15 to 20 knots becoming south. Waves
3 to 5 feet subsiding to 1 to 3 feet.
.FRIDAY...South winds to 30 knots becoming west 15 to 25 knots.
Showers. Waves 5 to 8 feet subsiding to 3 to 6 feet. Waves
occasionally around 10 feet.
.SATURDAY...Northwest winds 15 to 20 knots becoming east 5 to
15 knots. Rain showers likely. Waves 3 to 6 feet subsiding to
1 to 3 feet.
.SUNDAY...East winds 15 to 20 knots becoming northwest. Rain
showers during the day, then rain showers with snow showers
likely Sunday night. Waves 2 to 4 feet building to 3 to 6 feet.

$$

LOZ061-051600-
MAFOR 0510/
ONTARIO WEST 1/2...GALE WARNING IN EFFECT...11410 11420 11546
11556 11656 11756 12740. Waves 1 to 2 feet building to 9 to 12
feet, and occasionally around 15 feet today. Waves 11 to 15 feet
subsiding to 7 to 10 feet, and occasionally around 19 feet
tonight.

ONTARIO EAST 1/2...GALE WARNING IN EFFECT...11410 11420 11430
11546 11656 11756 11750 11740. Waves 1 to 3 feet building to 9 to
12 feet, and occasionally around 15 feet today. Waves 12 to 17
feet subsiding to 9 to 12 feet, and occasionally around 22 feet
tonight.

$$