521  
FZUS63 KDTX 211333  
GLFSC  
 
LAKE ST CLAIR FORECAST  
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI  
933 AM EDT FRI SEP 21 2018  
 
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 LOW PRESSURE SYSTEM AT 29.20 INCHES WILL CONTINUE TO  
LIFT INTO ONTARIO THIS MORNING. THE TRAILING COLD FRONT WILL  
SWEEP SOUTHEAST ACROSS THE CENTRAL GREAT LAKES THIS AFTERNOON AS  
THIS LOW RACES INTO QUEBEC WHILE DEEPENING TO 28.90 INCHES. A  
LARGE HIGH PRESSURE SYSTEM AT 30.30 INCHES WILL BUILD INTO THE  
AREA THIS WEEKEND.  
 
LCZ460-212015-  
LAKE ST CLAIR-  
933 AM EDT FRI SEP 21 2018  
   
..SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS EVENING
 
 
   
REST OF TODAY
 
SOUTHWEST WINDS 15 TO 20 KNOTS WITH GUSTS TO 30  
KNOTS INCREASING TO 20 TO 25 KNOTS WITH GUSTS TO 30 KNOTS EARLY IN  
THE AFTERNOON...THEN BECOMING WEST 15 TO 20 KNOTS LATE IN THE  
AFTERNOON. PARTLY SUNNY WITH A CHANCE OF LIGHT SHOWERS. WAVES 1 TO 3  
FEET.   
TONIGHT
 
NORTHWEST WINDS 15 TO 20 KNOTS WITH GUSTS TO 30 KNOTS.  
PARTLY CLOUDY. WAVES 1 TO 3 FEET.   
SATURDAY
 
NORTH WINDS 10 TO 15 KNOTS BECOMING LIGHT AND VARIABLE.  
PARTLY SUNNY. WAVES 2 FEET OR LESS.   
SATURDAY NIGHT
 
LIGHT AND VARIABLE WINDS. MOSTLY CLEAR. WAVES 2  
FEET OR LESS.   
SUNDAY
 
NORTHEAST WINDS 5 TO 10 KNOTS. MOSTLY SUNNY EARLY IN THE  
MORNING BECOMING CLEAR. WAVES 2 FEET OR LESS.   
MONDAY
 
SOUTHEAST WINDS 10 TO 15 KNOTS. PARTLY CLOUDY. A CHANCE OF  
SHOWERS AND THUNDERSTORMS. WAVES 2 FEET OR LESS.   
TUESDAY
 
WEST WINDS 15 TO 20 KNOTS. MOSTLY CLOUDY WITH SHOWERS  
LIKELY AND A CHANCE OF THUNDERSTORMS. WAVES 1 TO 3 FEET.  
 

 
 
SC  
 
EXPERIMENTAL MODERNIZED OPEN LAKE FORECAST IS AVAILABLE ONLINE AT  
WEATHER.GOV/DTX/GLFTABLESC  
 
GRAPHICAL MARINE FORECASTS ARE AVAILABLE AT WEATHER.GOV/GREATLAKES  
 
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