Experimental Modernized Open Lake Forecast - Lake Ontario

NZUS99 KBUF 211152
GLFLOT

Experimental Tabular Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
652 AM EST Fri Nov 21 2025

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 surface low near James Bay will swing a cold
front through the lower Great Lakes today, with a 30.1 inch high
building over the Ohio Valley and lower Great Lakes Saturday. A 29.5
inch low will then move from northern Ontario to James Bay Sunday,
sending its cold front across the lake through the afternoon hours.
A 30.2 inch high is then forecast to build across the Ohio Valley
Monday. On Tuesday a 29.5 inch low to the north of Lake Superior
will swing a cold front across the Lake by Tuesday night.

LOZ062-211500-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
652 AM EST Fri Nov 21 2025

.Today...
Weather.............Partly sunny.
Sfc winds...........Southwest 20 to 25 knots.
100-ft winds........Southwest to 30 knots.
Sig waves...........5 to 7 feet.
Ocnl waves..........Around 9 feet.

.TONIGHT...
Weather.............Mostly cloudy.
Sfc winds...........West 10 to 15 knots.
100-ft winds........West 15 to 20 knots.
Sig waves...........3 to 5 feet subsiding to 2 to 4 feet after
                              midnight.
Ocnl waves..........Around 6 feet in the evening.

.SATURDAY...
Weather.............Mostly sunny.
Sfc winds...........Northwest 10 to 15 knots.
100-ft winds........Northwest 15 to 20 knots.
Sig waves...........2 to 4 feet.

.SATURDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........West 10 to 15 knots.
100-ft winds........West 15 to 20 knots.
Sig waves...........2 to 4 feet.


.FORECAST DAYS 3 THROUGH 5......
.SUNDAY...Southwest winds 15 to 20 knots. Waves 3 to 5 feet.
.MONDAY...Chance of showers after midnight. West winds 5 to
10 knots. Waves 2 to 4 feet.
.TUESDAY...Showers, then showers likely. Southeast winds 10 to
15 knots. Waves 2 to 4 feet.

$$

LOZ063-211500-
Lake Ontario open waters from Hamlin Beach to Sodus Bay-
652 AM EST Fri Nov 21 2025

.Today...
Weather.............Mostly cloudy.
Sfc winds...........Southwest 20 to 25 knots.
100-ft winds........Southwest to 30 knots.
Sig waves...........6 to 9 feet.
Ocnl waves..........Around 10 feet.

.TONIGHT...
Weather.............Mostly cloudy.
Sfc winds...........West 10 to 15 knots.
100-ft winds........Northwest 15 to 20 knots.
Sig waves...........5 to 7 feet subsiding to 2 to 4 feet after
                              midnight.
Ocnl waves..........Around 9 feet subsiding to around 5 feet after
                              midnight.

.SATURDAY...
Weather.............Mostly sunny.
Sfc winds...........Northwest 10 to 15 knots.
100-ft winds........Northwest 15 to 20 knots.
Sig waves...........2 to 4 feet.

.SATURDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........West 10 to 15 knots.
100-ft winds........West 15 to 20 knots.
Sig waves...........2 to 4 feet.


.FORECAST DAYS 3 THROUGH 5......
.SUNDAY...Southwest winds 15 to 20 knots. Waves 4 to 6 feet.
.MONDAY...West winds 10 to 15 knots. Waves 3 to 5 feet.
.TUESDAY...Chance of showers in the morning, then showers likely
in the afternoon and evening. chance of showers after midnight.
Southeast winds 10 to 15 knots. Waves 2 to 4 feet.

$$

LOZ064-065-211500-
Lake Ontario open waters from Sodus Bay to Mexico Bay-
Lake Ontario open waters from Mexico Bay to the Saint Lawrence
River-
652 AM EST Fri Nov 21 2025

.Today...
Weather.............Mostly cloudy with chance of showers, then
                              mostly cloudy in the afternoon.
Sfc winds...........Southwest 20 to 25 knots.
100-ft winds........Southwest to 30 knots.
Sig waves...........6 to 9 feet.
Ocnl waves..........Around 11 feet.

.TONIGHT...
Weather.............Mostly cloudy.
Sfc winds...........West 15 to 20 knots.
100-ft winds........Northwest 20 to 25 knots.
Sig waves...........6 to 9 feet subsiding to 3 to 5 feet after
                              midnight.
Ocnl waves..........Around 10 feet subsiding to around 5 feet after
                              midnight.

.SATURDAY...
Weather.............Mostly sunny.
Sfc winds...........Northwest 10 to 15 knots.
100-ft winds........Northwest 15 to 20 knots.
Sig waves...........2 to 4 feet.

.SATURDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........West 10 to 15 knots.
100-ft winds........West 15 to 20 knots.
Sig waves...........2 to 4 feet.


.FORECAST DAYS 3 THROUGH 5......
.SUNDAY...Chance of showers. Southwest winds 15 to 20 knots.
Waves 4 to 6 feet.
.MONDAY...Northwest winds 10 to 15 knots. Waves 3 to 5 feet.
.TUESDAY...Showers likely, then showers. Southeast winds 15 to
20 knots. Waves 3 to 5 feet.

$$

LOZ061-211500-
MAFOR 2110/
ONTARIO WEST 1/2 12530 13630 13710. A chance of showers early
this morning. Waves 2 to 4 feet building to 3 to 6 feet today.
Waves 3 to 5 feet subsiding to 1 to 3 feet tonight.

ONTARIO EAST 1/2 11520 11530 13630 13710. A chance of rain
showers this morning. Waves 1 to 3 feet building to 4 to 7 feet
today. Waves 3 to 6 feet subsiding to 1 to 3 feet tonight.

$$

Occasional waves will only be displayed when values meet or exceed 5 feet / 2 meters.

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