FZUS61 KBUF 040802

GLFLO 



Open Lake Forecast for Lake Ontario

National Weather Service Buffalo NY

402 AM EDT Mon May 4 2026



For waters beyond five nautical miles of shore on Lake Ontario



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 29.1 inch low over western Ontario Province today will 

weaken to 29.3 inches as it moves to northern Quebec through 

Tuesday. Its trailing wavy cold front will slowly cross the lake 

Tuesday, then will drift across New England Wednesday and out to sea 

Thursday. A 30.1 inch high over the Tennessee and Ohio Valleys will 

then slide to the mid-Atlantic coastline Friday.



LOZ062-041500-

Lake Ontario open waters from the Niagara River to Hamlin Beach-

402 AM EDT Mon May 4 2026



.TODAY...Southwest winds 15 to 20 knots. Waves 3 to 5 feet

subsiding to 2 to 4 feet. 

.TONIGHT...Southwest winds 15 to 20 knots. A chance of showers

from late evening on. Waves 2 to 4 feet building to 3 to 5 feet. 

.TUESDAY...Southwest winds 15 to 20 knots becoming west 10 to

15 knots. Showers likely. Waves 3 to 5 feet subsiding to 2 to

3 feet. 

.TUESDAY NIGHT...West winds 5 to 10 knots becoming north. Showers

likely in the evening, then rain likely overnight. Waves 1 to

3 feet. 

.WEDNESDAY...North winds 5 to 15 knots becoming northwest. Rain

likely during the day. Waves 2 feet or less. 

.THURSDAY...Northwest winds 5 to 10 knots becoming west. Waves

2 feet or less. 

.FRIDAY...West winds 5 to 15 knots. Waves 1 to 2 feet. 



$$



LOZ063>065-041500-

Lake Ontario open waters from Hamlin Beach to the Saint Lawrence

River-

402 AM EDT Mon May 4 2026



.TODAY...Southwest winds 15 to 20 knots diminishing to 10 to

15 knots. A chance of showers early, then a chance of sprinkles

late this morning. Waves 3 to 5 feet subsiding to 1 to 3 feet. 

.TONIGHT...South winds 5 to 10 knots increasing to 15 to

20 knots. A chance of showers after midnight. Waves 1 to 3 feet

building to 2 to 4 feet. 

.TUESDAY...Southwest winds 15 to 20 knots becoming west 10 to

15 knots. Showers likely in the morning, then showers with a

chance of thunderstorms in the afternoon. Waves 2 to 4 feet. 

.TUESDAY NIGHT...West winds 5 to 15 knots becoming northwest.

Showers with a chance of thunderstorms in the evening, then rain

overnight. Waves 2 to 4 feet subsiding to 1 to 3 feet. 

.WEDNESDAY...North winds 5 to 10 knots becoming west. Rain during

the day, then a chance of showers Wednesday night. Waves 1 to

2 feet. 

.THURSDAY...West winds 5 to 15 knots. Waves 1 to 3 feet. 

.FRIDAY...West winds 15 to 20 knots becoming southwest 10 to

15 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet. 



Winds and waves higher in and near thunderstorms.



$$



LOZ061-041500-

MAFOR 0409/

ONTARIO WEST 1/2 14520 11520 12420 11520. A chance of showers

overnight. Waves 3 to 5 feet subsiding to 2 to 4 feet today.

Waves 2 to 4 feet building to 3 to 5 feet tonight. 



ONTARIO EAST 1/2 12520 12510 11500 11410 12420. A chance of

showers this morning and overnight. Waves 2 to 4 feet building to

3 to 5 feet, then subsiding to 1 to 3 feet today. Waves 1 to 3

feet building to 2 to 4 feet tonight. 



$$