510  
FZUS63 KDTX 210133  
GLFSC  
 
LAKE ST CLAIR FORECAST  
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI  
933 PM EDT FRI JUL 20 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 BROAD LOW PRESSURE SYSTEM AVERAGING 29.60 INCHES  
WILL CONTINUE TO EDGE EAST TOWARDS SOUTHERN MICHIGAN FROM  
SOUTHERN WISCONSIN FRIDAY AFTERNOON THROUGH SATURDAY. PRESSURE  
WILL REMAIN FAIRLY CONSTANT BETWEEN 29.60 TO 29.70 INCHES AS IT  
MOVES INTO MICHIGAN, BRINGING ON AND OFF SHOWERS AND  
THUNDERSTORMS. LOW PRESSURE IS THEN EXPECTED TO PUSH SOUTH ON  
SUNDAY, WHICH WILL INCREASE PRESSURE AROUND THE GREAT LAKES UP TO  
29.80 INCHES BY SUNDAY AFTERNOON.  
 
LCZ460-210815-  
LAKE ST CLAIR-  
933 PM EDT FRI JUL 20 2018  
   
REST OF TONIGHT
 
SOUTHEAST WINDS 10 TO 15 KNOTS BECOMING SOUTH 15  
TO 20 KNOTS AFTER MIDNIGHT. MOSTLY CLOUDY. SCATTERED LIGHT SHOWERS  
AND A CHANCE OF THUNDERSTORMS THIS EVENING...THEN SCATTERED LIGHT  
SHOWERS AFTER MIDNIGHT. WAVES 1 TO 3 FEET.   
SATURDAY
 
SOUTHEAST WINDS 10 TO 15 KNOTS INCREASING TO 15 TO 20  
KNOTS IN THE LATE MORNING AND AFTERNOON. CLOUDY WITH LIGHT SHOWERS  
LIKELY AND A CHANCE OF THUNDERSTORMS. WAVES 1 TO 3 FEET.   
SATURDAY NIGHT
 
EAST WINDS 10 TO 15 KNOTS. MOSTLY CLOUDY. LIGHT  
SHOWERS LIKELY AND A CHANCE OF THUNDERSTORMS EARLY IN THE  
EVENING...THEN A CHANCE OF LIGHT SHOWERS IN THE LATE EVENING AND  
EARLY MORNING. WAVES 2 FEET OR LESS.   
SUNDAY
 
NORTHEAST WINDS 10 TO 15 KNOTS. MOSTLY CLOUDY. WAVES 2  
FEET OR LESS.   
SUNDAY NIGHT
 
NORTHEAST WINDS 10 TO 15 KNOTS DIMINISHING TO 5 TO  
10 KNOTS AFTER MIDNIGHT. PARTLY CLOUDY BECOMING MOSTLY CLOUDY LATE  
IN THE EVENING BECOMING PARTLY CLOUDY. WAVES 2 FEET OR LESS.   
MONDAY
 
NORTHEAST WINDS 5 TO 10 KNOTS. PARTLY CLOUDY. WAVES 2 FEET  
OR LESS.   
TUESDAY
 
LIGHT AND VARIABLE WINDS. MOSTLY CLEAR. WAVES 2 FEET OR  
LESS.   
WEDNESDAY
 
LIGHT AND VARIABLE WINDS. MOSTLY CLEAR. WAVES NEARLY  
CALM.  
 

 
 
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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