Air Quality Concerns; Fire Weather; Extreme Heat; Severe Thunderstorms and Flash Flooding

Wildfire smoke continues to result in poor air quality from the Upper Midwest into the Northeast. Dangerous heat and fire weather concerns for portions of the Four Corners region into the central Great Basin and Rockies. Heavy rainfall and flash flooding possible for the Southeast through today. Strong to severe thunderstorms for the Southern Plains with severe wind gusts and large hail possible. Read More >

NZUS99 KBUF 042052
GLFLOT

Experimental Tabular Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
452 PM EDT Mon Aug 4 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 backdoor cold front will move south across the
lake tonight. A 30.4 inch high will then build from Quebec Tuesday
to New England Wednesday through Thursday before moving east of New
England by Friday.

LOZ062-050200-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
452 PM EDT Mon Aug 4 2025

.Tonight...
Weather.............Mostly cloudy with haze, then mostly cloudy
                              after midnight.
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...........2 feet or less.

.TUESDAY...
Weather.............Partly sunny.
Sfc winds...........East 10 to 15 knots.
100-ft winds........East 15 to 20 knots.
Sig waves...........2 to 4 feet.

.TUESDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........East 10 to 15 knots.
100-ft winds........East 15 to 20 knots.
Sig waves...........2 to 4 feet.

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

.WEDNESDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........East 10 to 15 knots.
100-ft winds........Southeast 15 to 20 knots.
Sig waves...........2 to 4 feet.

.FORECAST DAYS 3 THROUGH 5......
.THURSDAY...East winds 5 to 10 knots. Waves 1 to 3 feet.
.FRIDAY...South winds 5 to 10 knots. Waves 1 to 3 feet.
.SATURDAY...Southwest winds 5 to 10 knots. Waves 1 to 3 feet.

$$

LOZ063>065-050200-
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-
452 PM EDT Mon Aug 4 2025

.Tonight...
Weather.............Partly cloudy with haze, then mostly cloudy
                              after midnight.
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.

.TUESDAY...
Weather.............Partly sunny.
Sfc winds...........Northeast 10 to 15 knots becoming north in the
                              afternoon.
100-ft winds........Northeast 15 to 20 knots becoming north in the
                              afternoon.
Sig waves...........2 to 4 feet.

.TUESDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Northeast 10 to 15 knots.
100-ft winds........Northeast 15 to 20 knots.
Sig waves...........2 to 4 feet.

.WEDNESDAY...
Weather.............Mostly sunny.
Sfc winds...........Northeast 5 to 10 knots.
100-ft winds........Northeast 10 to 15 knots.
Sig waves...........2 to 4 feet.

.WEDNESDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........East 5 to 10 knots becoming southeast after
                              midnight.
100-ft winds........East 10 to 15 knots becoming southeast after
                              midnight.
Sig waves...........1 to 3 feet.

.FORECAST DAYS 3 THROUGH 5......
.THURSDAY...South winds 5 to 10 knots. Waves 1 to 3 feet.
.FRIDAY...South winds 5 to 10 knots. Waves 2 to 4 feet.
.SATURDAY...Southwest winds 5 to 10 knots. Waves 1 to 3 feet.

$$

LOZ061-050200-
MAFOR 0421/
ONTARIO WEST 1/2 11400 14200 13210. Waves 1 foot or less tonight.
Waves 1 to 3 feet Tuesday.

ONTARIO EAST 1/2 11500 11800 12100 11200 11210 12100. Waves 2
feet or less.

$$