FZUS61 KBUF 050202

GLFLO 



Open Lake Forecast for Lake Ontario

National Weather Service Buffalo NY

1002 PM 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 Hudson Bay tonight through Tuesday 

will weaken to 29.3 inches as it moves to northern Quebec through 

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

late Tuesday, then will drift across New England Wednesday and out 

to sea Thursday. A 30.1 inch high over the Tennessee and Ohio 

Valleys Thursday night will slide to the mid-Atlantic coastline 

Friday.



LOZ062-050900-

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

1002 PM EDT Mon May 4 2026



.OVERNIGHT...South winds 15 to 20 knots becoming southwest.

A chance of showers. Waves 2 to 4 feet building to

3 to 5 feet. 

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

15 knots. A chance of showers through early afternoon, then

showers likely late. Waves 3 to 5 feet subsiding to 1 to 3 feet. 

.TUESDAY NIGHT...Southwest winds 5 to 10 knots becoming east.

Rain likely in the evening, then rain overnight. Waves 2 feet or

less. 

.WEDNESDAY...Northeast winds 5 to 10 knots becoming west. Rain in

the morning, then showers likely in the afternoon. Waves 1 foot

or less. 

.WEDNESDAY NIGHT...West winds 5 to 10 knots. Waves 1 foot or

less. 

.THURSDAY...West winds 5 to 10 knots. Waves 1 foot or less. 

.FRIDAY...West winds 5 to 10 knots becoming southwest. Waves 1 to

2 feet. 

.SATURDAY...Southwest winds 5 to 10 knots becoming west. A chance

of showers. Waves 1 to 2 feet. 



$$



LOZ063>065-050900-

Lake Ontario open waters from Hamlin Beach to the Saint Lawrence

River-

1002 PM EDT Mon May 4 2026



.OVERNIGHT...South winds 15 to 20 knots. A chance of

showers. Waves 1 to 3 feet building to 2 to

4 feet. 

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

15 knots. A chance of showers early, then showers likely late in

the morning. Showers likely with a chance of thunderstorms in the

afternoon. Waves 2 to 4 feet. 

.TUESDAY NIGHT...West winds 5 to 15 knots becoming south less

than 10 knots. Rain with a chance of thunderstorms in the

evening, then rain overnight. Waves 1 to 3 feet subsiding to

1 foot or less. 

.WEDNESDAY...North winds 5 to 10 knots becoming northwest. Rain

in the morning, then showers in the afternoon. Waves 1 foot or

less. 

.WEDNESDAY NIGHT...West winds 5 to 10 knots. A chance of showers.

Waves 2 feet or less. 

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

.FRIDAY...West winds 5 to 15 knots becoming southwest. Waves 1 to

3 feet. 

.SATURDAY...Southwest winds 5 to 15 knots. A chance of showers.

Waves 1 to 2 feet. 



Winds and waves higher in and near thunderstorms.



$$



LOZ061-050900-

MAFOR 0503/

ONTARIO WEST 1/2 11420 13520 11610 11710 11616 11506. Waves 2 to

4 feet building to 3 to 5 feet overnight. Waves 3 to 5 feet

subsiding to 1 to 3 feet Tuesday. Waves 2 feet or less Tuesday

evening. 



ONTARIO EAST 1/2 13420 11520 11510 11610 11616 11606. A chance of

thunderstorms Tuesday evening. Waves 1 to 3 feet building to 2 to

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

Tuesday evening. 



$$