Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, little-to-no relief from the scorching daytime highs will be available. Read More >

NZUS99 KBUF 191152
GLFLOT

Experimental Tabular Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
752 AM EDT Wed Aug 19 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 cold front will cross the lake today. Behind the
front, high pressure averaging 30.1 inches will build from the upper
Great Lakes Thursday to New England by Friday night. The high will
then move into the Canadian Maritimes Saturday, while an elongated
29.7 inch low slowly makes its way from the central Great Lakes to
western Quebec Saturday and Sunday.

LOZ062-191400-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
752 AM EDT Wed Aug 19 2026

.Today...
Weather.............Partly sunny with showers likely, then mostly
                              sunny in the afternoon.
Sfc winds...........Southwest 10 to 15 knots.
100-ft winds........Southwest 15 to 20 knots.
Sig waves...........2 to 4 feet.

.TONIGHT...
Weather.............Partly cloudy.
Sfc winds...........West 10 to 15 knots.
100-ft winds........West 15 to 20 knots.
Sig waves...........2 to 4 feet.

.THURSDAY...
Weather.............Mostly sunny.
Sfc winds...........West 5 to 10 knots.
100-ft winds........West 10 to 15 knots.
Sig waves...........2 feet or less.

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

.FORECAST DAYS 3 THROUGH 5......
.FRIDAY...East winds 5 to 10 knots. Waves 1 to 3 feet.
.SATURDAY...Chance of showers in the afternoon. chance of
thunderstorms. showers likely. Southeast winds 10 to 15 knots.
Waves 2 to 4 feet.
.SUNDAY...Chance of showers. West winds 15 to 20 knots. Waves
3 to 5 feet.

$$

LOZ063>065-191400-
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-
752 AM EDT Wed Aug 19 2026

.Today...
Weather.............Mostly cloudy with showers likely, then mostly
                              sunny with chance of showers and thunderstorms
                              in the afternoon.
Sfc winds...........Southwest 10 to 15 knots.
100-ft winds........Southwest 15 to 20 knots.
Sig waves...........2 to 4 feet.

.TONIGHT...
Weather.............Partly cloudy.
Sfc winds...........Southwest 10 to 15 knots becoming west after
                              midnight.
100-ft winds........Southwest 15 to 20 knots becoming west after
                              midnight.
Sig waves...........2 to 4 feet.

.THURSDAY...
Weather.............Mostly sunny.
Sfc winds...........Northwest 5 to 10 knots becoming west in the
                              afternoon.
100-ft winds........Northwest 10 to 15 knots becoming west in the
                              afternoon.
Sig waves...........2 to 4 feet.

.THURSDAY 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......
.FRIDAY...East winds 5 to 10 knots. Waves 1 to 3 feet.
.SATURDAY...Chance of showers in the afternoon and evening.
chance of thunderstorms. showers likely after midnight. Southeast
winds 10 to 15 knots. Waves 2 to 4 feet.
.SUNDAY...Chance of showers. chance of thunderstorms in the
evening. South winds 15 to 20 knots. Waves 3 to 5 feet.

$$

LOZ061-191400-
MAFOR 1909/
ONTARIO WEST 1/2 11516 11510 12610 11600 13700. Waves 1 to 3 feet
today. Waves 2 feet or less tonight.

ONTARIO EAST 1/2 11510 12516 11610 12600 12700. A chance of
thunderstorms this afternoon. Waves 1 to 3 feet.

$$