Heat Wave Expands to the East Coast; Flash Flooding Likely in the Central Plains into the Midwest; Severe Thunderstorms in the Northeast

Dangerous, prolonged heat is ongoing in the Mid-South to Mid-Mississippi Valley and heat expands into the Northeast for a brief period today. Widely scattered instances of flash flooding due to heavy rains are forecast from northeast Kansas to much of Indiana. Scattered strong to severe thunderstorms are possible across parts of New England, northern Mid-Atlantic, and North Dakota. Read More >

NZUS99 KBUF 260252
GLFLOT

Experimental Tabular Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
1052 PM EDT Fri Jul 25 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 weak cold front will stall just south of New York
State tonight. A 30.1 inch high will then build from the upper Great
Lakes Friday night to New England Saturday night, then to just south
of the Canadian Maritimes Sunday. Meanwhile, a weak 29.8 inch
surface low will pass near the Lake Sunday morning. A general area
of weak high pressure averaging 30.0 inches will then build into the
Ohio Valley and southern Great Lakes Sunday night and Monday. A weak
29.7 inch low will move from James Bay Monday night to east-central
Quebec by late Tuesday, while sending a cold front across the Lake
in the process.

LOZ062-260800-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
1052 PM EDT Fri Jul 25 2025

.Overnight...
Weather.............Partly cloudy.
Sfc winds...........West 5 to 10 knots.
100-ft winds........West 10 to 15 knots.
Sig waves...........2 feet or less.

.SATURDAY...
Weather.............Partly sunny.
Sfc winds...........East 5 to 10 knots.
100-ft winds........East 10 to 15 knots.
Sig waves...........2 feet or less.

.SATURDAY NIGHT...
Weather.............Mostly cloudy with chance of showers and
                              thunderstorms, then mostly cloudy with chance
                              of showers after midnight.
Sfc winds...........East 5 to 10 knots becoming south after
                              midnight.
100-ft winds........East 10 to 15 knots becoming south after
                              midnight.
Sig waves...........1 to 3 feet.

.SUNDAY...
Weather.............Partly sunny with chance of showers, then
                              mostly sunny in the afternoon.
Sfc winds...........Southwest 10 to 15 knots.
100-ft winds........Southwest 15 to 20 knots.
Sig waves...........1 to 3 feet.

.SUNDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........West 5 to 10 knots.
100-ft winds........West 10 to 15 knots.
Sig waves...........1 to 3 feet.

.FORECAST DAYS 3 THROUGH 5......
.MONDAY...Chance of showers. Southwest winds 5 to 10 knots. Waves
1 to 3 feet.
.TUESDAY...West winds 10 to 15 knots. Waves 2 to 4 feet.
.WEDNESDAY...North winds 10 to 15 knots. Waves 2 to 4 feet.

$$

LOZ063>065-260800-
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 Fri Jul 25 2025

.Overnight...
Weather.............Partly cloudy.
Sfc winds...........West 5 to 10 knots.
100-ft winds........West 10 to 15 knots.
Sig waves...........1 to 3 feet.

.SATURDAY...
Weather.............Partly sunny.
Sfc winds...........South 5 to 10 knots becoming east in the
                              afternoon.
100-ft winds........South 10 to 15 knots becoming east in the
                              afternoon.
Sig waves...........2 feet or less.

.SATURDAY NIGHT...
Weather.............Mostly cloudy, then chance of showers and
                              thunderstorms after midnight.
Sfc winds...........East 5 to 10 knots becoming south 10 to 15
                              knots after midnight.
100-ft winds........East 10 to 15 knots becoming south 15 to 20
                              knots after midnight.
Sig waves...........1 to 3 feet.

.SUNDAY...
Weather.............Partly sunny with chance of showers, then
                              mostly sunny in the afternoon.
Sfc winds...........Southwest 5 to 10 knots.
100-ft winds........Southwest 10 to 15 knots.
Sig waves...........2 to 4 feet.

.SUNDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........West 5 to 10 knots becoming southwest after
                              midnight.
100-ft winds........West 10 to 15 knots becoming southwest after
                              midnight.
Sig waves...........1 to 3 feet.

.FORECAST DAYS 3 THROUGH 5......
.MONDAY...Chance of showers after midnight. Southwest winds 5 to
10 knots. Waves 1 to 3 feet.
.TUESDAY...Chance of showers in the morning. Southwest winds
10 to 15 knots. Waves 2 to 4 feet.
.WEDNESDAY...North winds 10 to 15 knots. Waves 2 to 4 feet.

$$

LOZ061-260800-
MAFOR 2603/
ONTARIO WEST 1/2 12700 11300 11400 13200 11400. A chance of
showers and thunderstorms Saturday evening. Waves 1 foot or less.

ONTARIO EAST 1/2 11500 14300 12200 11400. Waves 1 foot or less.

$$