Excessive Rainfall Potential for the Southeast; Heat Expands for Center of the Nation; Critical Fire Weather for Pacific Northwest

Flash flooding threatens areas from the Tennessee Valley to the Carolinas as storms repeat along a stalled front. Monsoonal storms may trigger flooding in the Southwest. Dangerous heat expands across the Desert Southwest, Plains, mid-Mississippi Valley and Southern Tier. Critical fire weather for interior Pacific Northwest. Cooler, drier air brings brief relief to the Great Lakes and Northeast. Read More >

NZUS99 KBUF 251452
GLFLOT

Experimental Tabular Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
1052 AM EDT Sat Jul 25 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 30.2 inch surface high will linger just off the New
England coast today, before slowly weakening while drifting to the
Gulf of Saint Lawrence Sunday. A 29.5 inch area of low pressure will
develop over the western Great Lakes Sunday night into Monday,
before strengthening to 29.3 inches while moving southeast into the
lower Great Lakes region Monday night and Tuesday. A cold front
associated with this low will swing across the Lake late Tuesday and
Tuesday night. The low will then weaken to 29.6 inches while
drifting east into New England by Wednesday.

LOZ062-252000-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
1052 AM EDT Sat Jul 25 2026

.This Afternoon...
Weather.............Mostly sunny.
Sfc winds...........Light and variable winds becoming northeast 5
                              to 10 knots in the afternoon.
100-ft winds........Light and variable winds becoming northeast 10
                              to 15 knots in the afternoon.
Sig waves...........2 feet or less.

.TONIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Northeast 5 to 10 knots becoming south after
                              midnight.
100-ft winds........Northeast 10 to 15 knots becoming south after
                              midnight.
Sig waves...........2 feet or less.

.SUNDAY...
Weather.............Mostly sunny.
Sfc winds...........Southwest 5 to 10 knots in the morning becoming
                              light and variable.
100-ft winds........Southwest 10 to 15 knots in the morning
                              becoming light and variable.
Sig waves...........2 feet or less.

.SUNDAY NIGHT...
Weather.............Mostly cloudy with chance of showers.
Sfc winds...........South 5 to 10 knots becoming southwest after
                              midnight.
100-ft winds........South 10 to 15 knots becoming southwest after
                              midnight.
Sig waves...........2 feet or less.

.FORECAST DAYS 3 THROUGH 5......
.MONDAY...Chance of thunderstorms. Showers. Southwest winds 5 to
10 knots. Waves 1 to 3 feet.
.TUESDAY...Showers likely. chance of thunderstorms. chance of
showers after midnight. West winds 10 to 15 knots. Waves 2 to
4 feet.
.WEDNESDAY...Chance of showers. Northwest winds 10 to 15 knots.
Waves 2 to 4 feet.

$$

LOZ063>065-252000-
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 AM EDT Sat Jul 25 2026

.This Afternoon...
Weather.............Sunny.
Sfc winds...........Southeast 5 to 10 knots becoming east in the
                              afternoon.
100-ft winds........Southeast 10 to 15 knots becoming east in the
                              afternoon.
Sig waves...........2 to 4 feet.

.TONIGHT...
Weather.............Mostly cloudy.
Sfc winds...........North 5 to 10 knots becoming south after
                              midnight.
100-ft winds........North 10 to 15 knots becoming south after
                              midnight.
Sig waves...........2 feet or less.

.SUNDAY...
Weather.............Mostly sunny.
Sfc winds...........South 5 to 10 knots in the morning becoming
                              light and variable.
100-ft winds........South 10 to 15 knots in the morning becoming
                              light and variable.
Sig waves...........1 to 3 feet.

.SUNDAY NIGHT...
Weather.............Mostly cloudy, then chance of showers after
                              midnight.
Sfc winds...........Light and variable winds becoming south 5 to 10
                              knots after midnight.
100-ft winds........Light and variable winds becoming south 10 to
                              15 knots after midnight.
Sig waves...........2 feet or less.

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

$$

LOZ061-252000-
MAFOR 2515/
ONTARIO WEST 1/2 13200 11300 11400 13500. Waves 1 foot or less.

ONTARIO EAST 1/2 11300 12200 11300 14400. Waves 2 feet or less.

$$