FZUS61 KBUF 211409

GLFLO 



Open Lake Forecast for Lake Ontario

National Weather Service Buffalo NY

1009 AM EDT Sat Mar 21 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 30.1 inch high will build across the lake today. A 

29.6 inch low will then cross the lower Great Lakes Sunday before 

sliding off the mid-Atlantic coast Monday. A 30.4 inch high is 

forecast to build across the upper Great Lakes Monday, then move to 

the lower Great Lakes Tuesday while strengthening to 30.5 inches. A 

29.8 inch low tracking across Quebec will then push its associated 

cold front across the lake on Wednesday.



LOZ062-212100-

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

1009 AM EDT Sat Mar 21 2026



.THIS AFTERNOON...Light and variable winds becoming east 5 to

10 knots. Waves 1 foot or less. 

.TONIGHT...East winds 10 to 15 knots. A chance of rain and snow

early, then a chance of rain from late evening on. Waves 1 to

2 feet building to 3 to 5 feet. 

.SUNDAY...Northeast winds 5 to 15 knots becoming north. Rain

likely. Waves 1 to 3 feet. 

.SUNDAY NIGHT...Northeast winds 10 to 15 knots increasing to

15 to 20 knots. A chance of rain and snow showers in the evening,

then a chance of snow showers overnight. Waves 2 to 4 feet. 

.MONDAY...North winds 15 to 20 knots diminishing to 5 to

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

.TUESDAY...West winds 5 to 15 knots increasing to 15 to 20 knots.

Waves 1 to 3 feet building to 2 to 4 feet. 

.WEDNESDAY...Northwest winds 15 to 20 knots becoming east. Waves

3 to 5 feet subsiding to 2 to 4 feet. 



$$



LOZ063-064-212100-

Lake Ontario open waters from Hamlin Beach to Mexico Bay-

1009 AM EDT Sat Mar 21 2026



.THIS AFTERNOON...Light and variable winds becoming northeast 5 to

10 knots. Waves 1 foot or less. 

.TONIGHT...East winds 10 to 15 knots becoming southeast. A chance

of rain and snow late in the evening. A chance of rain after

midnight. Waves 1 to 3 feet building to 2 to 4 feet. 

.SUNDAY...East winds 10 to 15 knots becoming north. Rain likely.

Waves 1 to 3 feet. 

.SUNDAY NIGHT...North winds 15 to 20 knots becoming northeast. A

chance of rain and snow showers in the evening, then a chance of

snow showers overnight. Waves 2 to 4 feet building to 3 to

5 feet. 

.MONDAY...North winds 15 to 20 knots diminishing to 5 to

15 knots. Waves 3 to 6 feet subsiding to 1 to 3 feet. 

.TUESDAY...Northwest winds 5 to 10 knots becoming west and

increasing to 15 to 20 knots. A chance of rain and snow showers

Tuesday night. Waves 2 feet or less building to 3 to 6 feet. 

.WEDNESDAY...Northwest winds 15 to 25 knots becoming east. A

chance of rain and snow showers during the day. Waves 4 to 7 feet

subsiding to 3 to 5 feet. Waves occasionally around 9 feet. 



$$



LOZ065-212100-

Lake Ontario open waters from Mexico Bay to the Saint Lawrence

River-

1009 AM EDT Sat Mar 21 2026



.THIS AFTERNOON...Light and variable winds. Waves 1 foot or less. 

.TONIGHT...Northeast winds 10 knots or less becoming southeast

10 to 15 knots. A chance of snow late in the evening. Rain and

snow likely after midnight, then rain likely late. Waves 2 feet

or less. 

.SUNDAY...Southeast winds 10 to 15 knots becoming north. Rain

likely. Waves 2 feet or less. 

.SUNDAY NIGHT...North winds 10 to 15 knots becoming northeast

15 to 20 knots. A chance of snow and rain showers in the evening,

then a chance of snow showers overnight. Waves 1 to 3 feet

building to 2 to 4 feet. 

.MONDAY...North winds 15 to 20 knots diminishing to 5 to

15 knots. Waves 2 to 4 feet subsiding to 1 foot or less. 

.TUESDAY...Northwest winds 5 to 10 knots becoming southwest and

increasing to15 to 20 knots. A chance of snow and rain showers

Tuesday night. Waves 2 feet or less building to 3 to 6 feet. 

.WEDNESDAY...Northwest winds 15 to 20 knots becoming east. A

chance of rain and snow showers during the day. Waves 3 to 6 feet

subsiding to 1 to 3 feet. 



$$



LOZ061-212100-

MAFOR 2115/

ONTARIO WEST 1/2 11100 11200 11210 13220 11200 11800. A chance of

rain tonight and Sunday morning. Waves 1 foot or less this

afternoon. Waves 1 to 2 feet building to 3 to 5 feet tonight.

Waves 1 to 3 feet Sunday morning. 



ONTARIO EAST 1/2 11800 12100 11210 11220 11320 11310 11300. A

chance of snow this evening, then a chance of rain overnight. A

chance of rain Sunday morning. Waves 1 foot or less this

afternoon. Waves 1 foot or less building to 2 to 4 feet tonight.

Waves 2 feet or less Sunday morning. 



$$