Experimental Modernized Open Lake Forecast - Lake Ontario

NZUS99 KBUF 210252
GLFLOT

Experimental Tabular Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
1052 PM EDT Wed May 20 2026

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 large 30.4 inch area of surface high pressure will
build across the entire Great Lakes region through Thursday, before
sliding east off the New England coast late Friday. This surface
high will then strengthen to 30.6 inches as it anchors over Atlantic
Canada through Sunday. A 29.9 inch low and attendant warm front will
then slowly approach the Lake late Friday night and Saturday, before
weakening and sliding eastward Sunday. A 30.1 inch high will settle
across the region Monday through Tuesday.

LOZ062-210800-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
1052 PM EDT Wed May 20 2026

.Overnight...
Weather.............Mostly cloudy.
Sfc winds...........Northwest 10 to 15 knots.
100-ft winds........Northwest 15 to 20 knots.
Sig waves...........2 to 4 feet building to 3 to 5 feet after
                              midnight.
Ocnl waves..........Around 5 feet after midnight.

.THURSDAY...
Weather.............Mostly sunny.
Sfc winds...........Northeast 10 to 15 knots.
100-ft winds........Northeast 15 to 20 knots.
Sig waves...........3 to 5 feet subsiding to 2 to 4 feet in the
                              afternoon.
Ocnl waves..........Around 6 feet in the morning.

.THURSDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Light and variable winds becoming northeast 5
                              to 10 knots after midnight.
100-ft winds........Light and variable winds becoming northeast 10
                              to 15 knots after midnight.
Sig waves...........1 to 3 feet.

.FRIDAY...
Weather.............Partly sunny.
Sfc winds...........East 15 to 20 knots.
100-ft winds........East 20 to 25 knots.
Sig waves...........2 to 4 feet building to 3 to 5 feet in the
                              afternoon.
Ocnl waves..........Around 7 feet in the afternoon.

.FRIDAY NIGHT...
Weather.............Cloudy, then chance of showers after midnight.
Sfc winds...........East 15 to 20 knots.
100-ft winds........East 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 7 feet.


.FORECAST DAYS 3 THROUGH 5......
.SATURDAY...Breezy, showers. East winds 20 to 25 knots. Waves
6 to 9 feet.
.SUNDAY...Showers likely in the morning, then chance of showers.
Southeast winds 5 to 10 knots. Waves 3 to 5 feet.
.MONDAY...Chance of showers in the morning. South winds 5 to
10 knots. Waves 1 to 3 feet.

$$

LOZ063>065-210800-
Lake Ontario open waters from Hamlin Beach to Sodus Bay-
Lake Ontario open waters from Sodus Bay to Mexico Bay-
Lake Ontario open waters from Mexico Bay to the Saint Lawrence
River-
1052 PM EDT Wed May 20 2026

.Overnight...
Weather.............Mostly cloudy.
Sfc winds...........Northwest 10 to 15 knots increasing to north 20
                              to 25 knots after midnight.
100-ft winds........Northwest 15 to 20 knots increasing to north to
                              30 knots after midnight.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 8 feet.

.THURSDAY...
Weather.............Mostly sunny.
Sfc winds...........Northeast 10 to 15 knots.
100-ft winds........Northeast 15 to 20 knots.
Sig waves...........5 to 7 feet subsiding to 2 to 4 feet in the
                              afternoon.
Ocnl waves..........Around 9 feet in the morning.

.THURSDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........Light and variable winds becoming north 5 to 10
                              knots after midnight.
100-ft winds........Light and variable winds becoming north 10 to
                              15 knots after midnight.
Sig waves...........2 feet or less.

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

.FRIDAY NIGHT...
Weather.............Mostly cloudy, then chance of showers after
                              midnight.
Sfc winds...........Northeast 10 to 15 knots.
100-ft winds........Northeast 15 to 20 knots.
Sig waves...........2 to 4 feet.


.FORECAST DAYS 3 THROUGH 5......
.SATURDAY...Breezy. Showers likely in the morning, then showers.
East winds 20 to 25 knots. Waves 5 to 7 feet.
.SUNDAY...Showers in the morning, then chance of showers.
Southeast winds 10 to 15 knots. Waves 4 to 6 feet.
.MONDAY...Chance of showers. South winds 5 to 10 knots. Waves
2 to 4 feet.

$$

LOZ061-210800-
MAFOR 2103/
ONTARIO WEST 1/2 11810 11110 11120 11110 11210 12300 11200. Waves
1 to 3 feet building to 2 to 4 feet overnight. Waves 2 to 4 feet
subsiding to 1 to 2 feet Thursday. Waves 1 foot or less Thursday
evening.

ONTARIO EAST 1/2 11820 12130 11110 11100 11800 11600 11700. Waves
2 to 4 feet building to 3 to 6 feet overnight. Waves 3 to 6 feet
subsiding to 1 to 3 feet Thursday. Waves 1 foot or less Thursday
evening.

$$

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

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