918  
FXUS63 KGRR 231115  
AFDGRR  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE GRAND RAPIDS MI  
715 AM EDT FRI AUG 23 2019  
 
LATEST UPDATE...  
AVIATION  
   
SYNOPSIS
 
 
ISSUED AT 312 AM EDT FRI AUG 23 2019  
 
- COMFORTABLE FOR THE NEXT FEW DAYS  
 
- NEXT CHANCE OF RAIN: MONDAY-TUESDAY  
 

 
   
DISCUSSION
 
(TODAY THROUGH NEXT THURSDAY)  
ISSUED AT 312 AM EDT FRI AUG 23 2019  
 
HIGH PRESSURE OVER THE GREAT LAKES WILL CONTINUE TO PRODUCE VERY  
COMFORTABLE LATE SUMMER WEATHER THROUGH SUNDAY. AS THE HIGH MOVES  
EAST A TROUGH OVER THE OHIO VALLEY WILL HELP A SFC LOW MOVE NORTH  
TOWARD MICHIGAN. MODELS SHOW THIS TROUGH AS NEGATIVELY TILTED WHICH  
SUGGESTS THAT IT MAY BE A DECENT RAIN PRODUCER. INDEED, PRECIPITABLE  
WATER VALUES CLIMB TO 2 INCHES MONDAY AFTERNOON AS THE LLJ NOSES  
INTO THE STATE. WE HAVE FAIRLY HIGH POPS LATE MONDAY FOR THIS.  
 
AFTER MONDAY, CHANCES FOR RAIN AREN'T ZERO, BUT THEY AREN'T THAT  
HIGH EITHER. A PERSISTENT UPPER LOW OVER WESTERN ONTARIO WILL SEE  
SEVERAL MINOR WAVES PUSH ACROSS THE STATE, BUT THE BEST DYNAMICS  
STAY NORTH OF THE CWA.  
 
HIGHS WILL BE MAINLY IN THE 70S THROUGH THE PERIOD. OTHER THAN  
MONDAY NIGHT, LOWS WILL MAINLY BE IN THE 50S.  
 

 
   
AVIATION
 
(FOR THE 12Z TAFS THROUGH 12Z SATURDAY MORNING)  
ISSUED AT 715 AM EDT FRI AUG 23 2019  
 
VFR CONDITIONS WILL CONTINUE THROUGH SATURDAY. WINDS WILL BE  
NORTH TO NORTHEAST AT 5 TO 10 KNOTS.  
 

 
   
MARINE
 
 
ISSUED AT 312 AM EDT FRI AUG 23 2019  
 
NORTH WIND 5 TO 15 KNOTS WILL RESULT IN 1-3 FOOT WAVES  
TODAY/TONIGHT.  
 

 
   
GRR WATCHES/WARNINGS/ADVISORIES
 
 
MI...NONE.  
LM...NONE.  

 
 

 
 
SYNOPSIS...04  
DISCUSSION...04  
AVIATION...OSTUNO  
MARINE...04  
 
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