217  
FXUS63 KGRR 220336  
AFDGRR  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE GRAND RAPIDS MI  
1136 PM EDT TUE MAY 21 2019  
 
LATEST UPDATE...  
AVIATION  
   
SYNOPSIS
 
 
ISSUED AT 258 PM EDT TUE MAY 21 2019  
 
- RAIN SHOWERS/ISOLATED THUNDER LATE TONIGHT  
 
- HEAVIER RAIN POSSIBLE FRIDAY NIGHT  
 
- MEMORIAL DAY WEEKEND SEASONABLY COOL, MOSTLY DRY  
 

 
   
DISCUSSION
 
(THIS EVENING THROUGH NEXT TUESDAY)  
ISSUED AT 258 PM EDT TUE MAY 21 2019  
 
PRIMARY FORECAST CONCERNS ARE TIMING AND AMOUNT OF PRECIP LATE  
TONIGHT AND AGAIN FRIDAY NIGHT. FOR TONIGHT...SHOWERS AND  
ISOLATED THUNDERSTORMS ASSOCIATED WITH WARM CONVEYER BELT ARRIVE  
ACROSS THE WESTERN FORECAST AREA AFTER MIDNIGHT AND SPREAD SLOWLY  
EAST BY DAYBREAK. BACK EDGE MOVES THROUGH BY AFTERNOON WITH ENOUGH  
SUNSHINE FOR TEMPERATURES TO RECOVER INTO THE 70S.  
 
THERE IS A LOW CHANCE FOR SHOWERS AS A COLD FRONT PUSHES THROUGH  
WEDNESDAY NIGHT. MOISTURE IS LIMITED HOWEVER SO MOST PLACES MAY  
REMAIN DRY. AN ACTIVE PATTERN CONTINUES THROUGH THE END OF THE  
WEEK WITH A SFC LOW PUSHING A WARM FRONT NORTH ON FRIDAY. MOST OF  
THE RAIN WITH THIS LOW WILL OCCUR FRIDAY NIGHT AS SHOWERS AND  
THUNDERSTORMS FIRE UP ALONG THE ADVANCING COLD FRONT. EXTENT OF  
CONVECTION COULD BE LIMITED BY LACK OF INSTABILITY DUE TO LATE  
NIGHT FRONTAL PASSAGE.  
 
MEMORIAL DAY WEEKEND LOOKS LIKE MOSTLY FAIR WEATHER AS FRONT  
STALLS ACROSS THE OHIO RIVER VALLEY AND CANADIAN SFC HIGH BUILDS  
IN WITH SEASONABLY COOL WEATHER.  
 

 
   
AVIATION
 
(FOR THE 06Z TAFS THROUGH 06Z THURSDAY)  
ISSUED AT 1130 PM EDT TUE MAY 21 2019  
 
VFR CONDITIONS OVERNIGHT WILL GRADUALLY DETERIORATE TO MVFR  
EARLY WEDNESDAY MORNING DUE TO DEVELOPMENT OF LOW CLOUDS AND  
SHOWERS. ISOLATED THUNDERSTORMS ARE ALSO POSSIBLE DURING THE  
EARLY TO MID MORNING HOURS WEDNESDAY.  
 
CONDITIONS WILL THEN IMPROVE TO VFR WEDNESDAY AFTERNOON AND  
EVENING. SOME SCATTERED SHOWERS AND PERHAPS A FEW THUNDERSTORMS  
WILL MOVE IN FROM THE WEST DURING THE LATE EVENING HORUS WEDNESDAY  
AND COULD CAUSE BRIEF REDUCTIONS TO MVFR/IFR AT OUR WESTERN  
TERMINALS AFTER AROUND 03Z THURSDAY.  
 

 
   
MARINE
 
 
ISSUED AT 258 PM EDT TUE MAY 21 2019  
 
OFFSHORE WINDS TONIGHT AND WEDNESDAY WILL MEAN WAVE HEIGHTS  
SHOULD REMAIN BELOW 4 FEET. WINDS COULD GUST ABOVE 25 KNOTS AT  
TIMES NORTH OF PENTWATER ON WEDNESDAY.  
 

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

 
 

 
 
SYNOPSIS...OSTUNO  
DISCUSSION...OSTUNO  
AVIATION...LAURENS  
MARINE...OSTUNO  
 
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