Heavy Snow from the Midwest into the Great Lakes; Locally Heavy Rain in the Western Gulf Coast

A significant winter storm will produce a broad area of moderate to heavy snow from the Midwest through the western Great Lakes. Significant snow accumulations of 6-12 inches, and locally more than 1 foot, and gusty wind may cause hazardous travel conditions. Thunderstorms, some severe, and showers may produce locally heavy rain and isolated flash flooding along the western Gulf Coast. Read More >

NZUS99 KBUF 291452
GLFLOT

Experimental Tabular Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
952 AM EST Sat Nov 29 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 over eastern Quebec this evening
will slide to NewFoundland overnight. Meanwhile, a 30.5 inch surface
high will build south into the mid-Mississippi Valley tonight, then
to the Ohio Valley and lower Great Lakes Saturday. Another surface
low will cut northeastward through the central Great Lakes Sunday,
slowly deepening from 29.6 inches Sunday morning to 29.4 inches
Sunday night over western Quebec. A cold front from this low will
cross the Lake late Sunday night. A 30.4 inch surface high centered
over the Central Plains will then build east across the Great Lakes
Monday, sliding quickly to New England on Tuesday. A 29.7 inch
surface low off the Carolina coastline Tuesday morning will deepen
to 28.9 inches over southern Atlantic Canada by Wednesday.

LOZ062-292100-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
952 AM EST Sat Nov 29 2025

...GALE WATCH IN EFFECT FROM SUNDAY MORNING THROUGH MONDAY
MORNING...

.This Afternoon...
Weather.............Partly sunny.
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 in the
                              afternoon.
Ocnl waves..........Around 6 feet subsiding to around 5 feet in the
                              afternoon.

.TONIGHT...
Weather.............Cloudy with chance of snow showers.
Sfc winds...........Southeast 5 to 10 knots increasing to 20 to 25
                              knots after midnight.
100-ft winds........Southeast 10 to 15 knots increasing to 30 knots
                              after midnight.
Sig waves...........2 to 4 feet building to 4 to 6 feet after
                              midnight.
Ocnl waves..........Around 8 feet after midnight.

.SUNDAY...
Weather.............Rain and snow showers, then showers likely in
                              the afternoon.
Sfc winds...........South to 30 knots increasing to southwest gales
                              to 40 knots in the afternoon.
100-ft winds........South gales to 35 knots increasing to southwest
                              storm force winds to 50 knots in the afternoon.
Sig waves...........6 to 9 feet building to 10 to 14 feet in the
                              afternoon.
Ocnl waves..........Around 11 feet building to around 18 feet in
                              the afternoon.

.SUNDAY NIGHT...
Weather.............Mostly cloudy with chance of rain and snow
                              showers, then mostly cloudy after midnight.
Sfc winds...........Southwest gales to 40 knots becoming west at 35
                              knots after midnight.
100-ft winds........Southwest storm force winds to 50 knots
                              becoming west gales to 45 knots after midnight.
Sig waves...........10 to 14 feet.
Ocnl waves..........Around 18 feet.

.FORECAST DAYS 3 THROUGH 5......
.MONDAY...Snow showers likely after midnight. Northwest winds
10 to 15 knots. Waves 5 to 7 feet.
.TUESDAY...Chance of snow showers. South winds 10 to 15 knots.
Waves 2 to 4 feet.
.WEDNESDAY...Windy. Chance of snow showers in the evening. snow
showers likely after midnight. Southwest winds to 30 knots. Waves
5 to 7 feet.

$$

LOZ063-292100-
Lake Ontario open waters from Hamlin Beach to Sodus Bay-
952 AM EST Sat Nov 29 2025

...GALE WATCH IN EFFECT FROM SUNDAY MORNING THROUGH MONDAY
MORNING...

.This Afternoon...
Weather.............Partly sunny.
Sfc winds...........West 15 to 20 knots.
100-ft winds........West 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 8 feet.

.TONIGHT...
Weather.............Cloudy, then chance of snow showers after
                              midnight.
Sfc winds...........South 5 to 10 knots increasing to southeast 20
                              to 25 knots after midnight.
100-ft winds........South 10 to 15 knots increasing to southeast to
                              30 knots after midnight.
Sig waves...........2 to 4 feet building to 6 to 9 feet after
                              midnight.
Ocnl waves..........Around 10 feet after midnight.

.SUNDAY...
Weather.............Rain and snow showers, then showers likely in
                              the afternoon.
Sfc winds...........South gales to 35 knots.
100-ft winds........South gales to 45 knots.
Sig waves...........8 to 12 feet.
Ocnl waves..........Around 14 feet.

.SUNDAY NIGHT...
Weather.............Mostly cloudy with chance of rain and snow
                              showers, then mostly cloudy after midnight.
Sfc winds...........Southwest gales to 40 knots becoming west at 35
                              knots after midnight.
100-ft winds........Southwest storm force winds to 50 knots
                              becoming west gales to 45 knots after midnight.
Sig waves...........14 to 18 feet.
Ocnl waves..........Around 21 feet.

.FORECAST DAYS 3 THROUGH 5......
.MONDAY...Chance of snow showers after midnight. Northwest winds
10 to 15 knots. Waves 6 to 9 feet.
.TUESDAY...Snow showers likely in the morning, then chance of
snow showers in the afternoon. South winds 10 to 15 knots. Waves
2 to 4 feet.
.WEDNESDAY...Breezy. Chance of snow showers in the evening. snow
showers likely after midnight. Southwest winds 20 to 25 knots.
Waves 6 to 9 feet.

$$

LOZ064-065-292100-
Lake Ontario open waters from Sodus Bay to Mexico Bay-
Lake Ontario open waters from Mexico Bay to the Saint Lawrence
River-
952 AM EST Sat Nov 29 2025

...GALE WATCH IN EFFECT FROM SUNDAY MORNING THROUGH MONDAY
MORNING...

.This Afternoon...
Weather.............Mostly sunny.
Sfc winds...........West 15 to 20 knots.
100-ft winds........West 20 to 25 knots.
Sig waves...........5 to 7 feet.
Ocnl waves..........Around 8 feet.

.TONIGHT...
Weather.............Cloudy.
Sfc winds...........West 5 to 10 knots increasing to southeast 20
                              to 25 knots after midnight.
100-ft winds........West 10 to 15 knots increasing to southeast to
                              30 knots after midnight.
Sig waves...........2 to 4 feet building to 5 to 7 feet after
                              midnight.
Ocnl waves..........Around 9 feet after midnight.

.SUNDAY...
Weather.............Snow showers, then showers in the afternoon.
Sfc winds...........South gales to 40 knots.
100-ft winds........South storm force winds to 50 knots.
Sig waves...........10 to 14 feet.
Ocnl waves..........Around 16 feet.

.SUNDAY NIGHT...
Weather.............Showers, then mostly cloudy with chance of snow
                              showers and light freezing rain after midnight.
Sfc winds...........Southwest gales to 40 knots becoming west at 35
                              knots after midnight.
100-ft winds........Southwest storm force winds to 50 knots
                              becoming west gales to 45 knots after midnight.
Sig waves...........14 to 18 feet.
Ocnl waves..........Around 22 feet.

.FORECAST DAYS 3 THROUGH 5......
.MONDAY...Chance of snow showers after midnight. Northwest winds
10 to 15 knots. Waves 6 to 9 feet.
.TUESDAY...Snow showers likely, then chance of snow showers in
the evening. South winds 10 to 15 knots. Waves 3 to 5 feet.
.WEDNESDAY...Breezy. Chance of snow showers in the afternoon and
evening. snow showers likely after midnight. Southwest winds
20 to 25 knots. Waves 6 to 9 feet.

$$

LOZ061-292100-
MAFOR 2916/
ONTARIO WEST 1/2 11610 11600 11500 11310 11320 11337 12447. Waves
2 to 4 feet subsiding to 1 to 3 feet this afternoon. Waves 2 feet
or less building to 3 to 6 feet tonight. Waves 4 to 7 feet Sunday
morning.

ONTARIO EAST 1/2 12610 11600 11400 11320 11337 12447. Waves 3 to
5 feet subsiding to 1 to 3 feet this afternoon. Waves 2 feet or
less building to 3 to 6 feet tonight. Waves 5 to 9 feet Sunday
morning.

$$