339  
FZUS61 KBUF 171402  
GLFLO  
 
OPEN LAKE FORECAST FOR LAKE ONTARIO  
NATIONAL WEATHER SERVICE BUFFALO NY  
1002 AM EDT THU JUL 17 2025  
 
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 29.7 INCH LOW WILL MAKE ITS WAY FROM LAKE HURON TO  
QUEBEC TODAY, PUSHING A COLD FRONT ACROSS THE LAKE, FOLLOWED BY A  
SECONDARY COLD FRONT THIS EVENING. A 30.2 INCH HIGH WILL BUILD FROM  
THE WESTERN GREAT LAKES TO NEW ENGLAND FRIDAY AND FRIDAY NIGHT,  
BEFORE DRIFTING OFF THE NEW ENGLAND COAST SATURDAY. A 29.8 INCH LOW  
WILL PUSH EAST ACROSS THE GREAT LAKES SATURDAY NIGHT BEFORE REACHING  
NEW ENGLAND SUNDAY, WITH A 30.1 INCH HIGH BUILDING ACROSS THE GREAT  
LAKES ON MONDAY.  
 
LOZ062-172100-  
LAKE ONTARIO OPEN WATERS FROM THE NIAGARA RIVER TO HAMLIN BEACH-  
1002 AM EDT THU JUL 17 2025  
   
REST OF TODAY
 
SOUTHWEST WINDS TO 30 KNOTS BECOMING WEST. A  
CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES 3 TO 6 FEET BUILDING  
TO 6 TO 10 FEET. WAVES OCCASIONALLY AROUND 13 FEET.    
TONIGHT
 
NORTHWEST WINDS TO 30 KNOTS BECOMING NORTH AND  
DIMINISHING TO 10 TO 15 KNOTS AFTER MIDNIGHT. WAVES 7 TO 10 FEET  
SUBSIDING TO 2 TO 4 FEET. WAVES OCCASIONALLY AROUND 13 FEET.    
FRIDAY
 
NORTHEAST WINDS 10 KNOTS OR LESS BECOMING SOUTHEAST.  
WAVES 2 FEET OR LESS.    
FRIDAY NIGHT
 
SOUTH WINDS 5 TO 10 KNOTS. WAVES 1 FOOT OR LESS.    
SATURDAY
 
SOUTH WINDS 5 TO 10 KNOTS BECOMING NORTHWEST. A  
CHANCE OF SHOWERS DURING THE DAY, THEN A CHANCE OF SHOWERS AND  
THUNDERSTORMS SATURDAY NIGHT. WAVES 2 FEET OR LESS.    
SUNDAY
 
NORTHWEST WINDS 10 TO 15 KNOTS BECOMING NORTHEAST.  
WAVES 1 TO 2 FEET.    
MONDAY
 
NORTHEAST WINDS 5 TO 10 KNOTS BECOMING SOUTHEAST. WAVES  
1 TO 2 FEET.  
 
WINDS AND WAVES HIGHER IN AND NEAR THUNDERSTORMS.  
 

 
 
LOZ063>065-172100-  
LAKE ONTARIO OPEN WATERS FROM HAMLIN BEACH TO THE SAINT LAWRENCE  
RIVER-  
1002 AM EDT THU JUL 17 2025  
   
REST OF TODAY
 
SOUTHWEST WINDS 15 TO 20 KNOTS BECOMING WEST AND  
INCREASING TO 30 KNOTS. A CHANCE OF SHOWERS AND THUNDERSTORMS  
LATE THIS MORNING, THEN SHOWERS LIKELY WITH A CHANCE OF  
THUNDERSTORMS EARLY THIS AFTERNOON. A CHANCE OF SHOWERS AND  
THUNDERSTORMS LATE. SOME THUNDERSTORMS MAY PRODUCE GUSTY WINDS  
EARLY THIS AFTERNOON. WAVES 2 TO 4 FEET BUILDING TO 8 TO 11 FEET.  
WAVES OCCASIONALLY AROUND 14 FEET.    
TONIGHT
 
WEST WINDS TO 30 KNOTS BECOMING NORTH 15 TO 25 KNOTS.  
WAVES 8 TO 12 FEET SUBSIDING TO 3 TO 5 FEET. WAVES OCCASIONALLY  
AROUND 15 FEET.    
FRIDAY
 
NORTH WINDS 5 TO 15 KNOTS BECOMING WEST. WAVES 2 TO  
4 FEET SUBSIDING TO 1 FOOT OR LESS.    
FRIDAY NIGHT
 
SOUTHWEST WINDS 5 TO 10 KNOTS BECOMING SOUTH.  
WAVES 1 FOOT OR LESS.    
SATURDAY
 
SOUTH WINDS 5 TO 15 KNOTS BECOMING NORTHWEST. A  
CHANCE OF SHOWERS DURING THE DAY, THEN A CHANCE OF SHOWERS AND  
THUNDERSTORMS SATURDAY NIGHT. WAVES 2 FEET OR LESS.    
SUNDAY
 
NORTHWEST WINDS 10 TO 15 KNOTS BECOMING NORTH. A CHANCE  
OF SHOWERS DURING THE DAY. WAVES 2 FEET OR LESS.    
MONDAY
 
NORTHEAST WINDS 5 TO 10 KNOTS BECOMING SOUTHEAST. WAVES  
2 FEET OR LESS.  
 
WINDS AND WAVES HIGHER IN AND NEAR THUNDERSTORMS.  
 

 
 
LOZ061-172100-  
MAFOR 1715/  
ONTARIO WEST 1/2 11540 12640 11730 11720 12810 11100. A CHANCE OF  
SHOWERS AND THUNDERSTORMS LATE THIS MORNING. WAVES 3 TO 6 FEET  
BUILDING TO 8 TO 11 FEET, AND OCCASIONALLY AROUND 14 FEET THIS  
AFTERNOON. WAVES 8 TO 11 FEET SUBSIDING TO 2 TO 4 FEET, AND  
OCCASIONALLY AROUND 14 FEET TONIGHT. WAVES 1 TO 3 FEET FRIDAY  
MORNING.  
 
ONTARIO EAST 1/2 11536 12640 11730 11720 11820 12810. A CHANCE OF  
THUNDERSTORMS THIS AFTERNOON. WAVES 1 TO 3 FEET BUILDING TO 8 TO  
11 FEET, AND OCCASIONALLY AROUND 14 FEET THIS AFTERNOON. WAVES 8  
TO 12 FEET SUBSIDING TO 3 TO 5 FEET, AND OCCASIONALLY AROUND 15  
FEET TONIGHT. WAVES 2 TO 4 FEET SUBSIDING TO 1 TO 3 FEET FRIDAY  
MORNING.  
 

 
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab NY Page Main Text Page