352  
FXUS63 KGRR 051933  
AFDGRR  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE GRAND RAPIDS MI  
333 PM EDT WED AUG 5 2020  
 
LATEST UPDATE...  
SYNOPSIS/DISCUSSION/MARINE  
   
SYNOPSIS
 
 
ISSUED AT 330 PM EDT WED AUG 5 2020  
 
- DRY WEATHER EXPECTED TONIGHT THROUGH SATURDAY  
 
- CHANCES FOR SHOWERS AND THUNDERSTORMS SUNDAY THROUGH TUESDAY  
 
- RAIN CHANCES MAY CONTINUE INTO MID WEEK  
 

 
   
DISCUSSION
 
(THIS EVENING THROUGH NEXT WEDNESDAY)  
ISSUED AT 330 PM EDT WED AUG 5 2020  
 
- DRY WEATHER EXPECTED TONIGHT THROUGH SATURDAY  
 
HIGH PRESSURE MOVING THROUGH THE GREAT LAKES REGION OVER THE  
COURSE OF THE NEXT FEW DAYS WILL RESULT IN DRY WEATHER. BUFKIT  
OVERVIEWS ARE SHOWING VERY LITTLE MOISTURE IN THE LOWEST 20,000FT.  
THERE IS HIGH CONFIDENCE IN THE FACT THAT WE SHOULD REMAIN DRY  
THROUGH SATURDAY.  
 
- CHANCES FOR SHOWERS AND THUNDERSTORMS SUNDAY THROUGH TUESDAY  
 
THE SUNDAY THROUGH TUESDAY TIME FRAME LOOKS TO BE A GOOD BET FOR  
ROUNDS OF SHOWERS AND THUNDERSTORMS. PWATS INCREASE SIGNIFICANTLY  
TO AROUND 2.00 INCHES ON MONDAY. SURFACE DEW POINTS RISE TO ABOVE  
70F AS EARLY AS SUNDAY. THE LOW LEVEL JET IS IN THE AREA MUCH OF  
THIS TIME SO WE ARE EXPECTING OCCASIONAL MCS'S DURING THIS TIME  
FRAME.  
 
- RAIN CHANCES MAY CONTINUE INTO MID WEEK  
 
THERE IS SOME MODEL DISCREPANCY IN THE MID WEEK TIME FRAME IN  
TERMS OF WHETHER THE BOUNDARY WORKS SOUTH THROUGH THE AREA OR  
HANGS UP IN OUR REGION. WE MAY NEED TO INCREASE POPS INTO THE MID  
NEXT WEEK TIME FRAME IF THE FRONT HANGS UP IN OUR AREA.  
 

 
   
AVIATION
 
(FOR THE 18Z TAFS THROUGH 18Z THURSDAY AFTERNOON)  
ISSUED AT 144 PM EDT WED AUG 5 2020  
 
VFR WEATHER IS EXPECTED THE NEXT 24 HOURS. WE HAVE A CUMULUS DECK  
THAT HAS FILLED IN THIS AFTERNOON WITH BOTH BROKEN CEILINGS AND  
SOME AREAS THAT REMAIN SCATTERED. WE ARE EXPECTING A FAIR AMOUNT  
OF CUMULUS TO REMAIN THIS AFTERNOON GIVEN THE CURRENT PRESENTATION  
ON SATELLITE. RIDGING BUILDING IN THIS EVENING AND THE LOSS OF  
DAYTIME HEATING SHOULD ALLOW THE CUMULUS TO CLEAR OUT QUICKLY.  
CEILING HEIGHTS THIS AFTERNOON SHOULD BE AROUND 5,000FT.  
 
THERE ARE A COUPLE OF SHORTWAVES UPSTREAM (ONE IN SOUTHERN  
WISCONSIN AND ONE IN SOUTHERN MINNESOTA) THAT WILL SPREAD SOME  
HIGH CLOUDS THROUGH OUR AREA OVER THE NEXT 24 HOURS. CEILINGS  
SHOULD BE ABOVE 15,000FT SO NO ISSUES TO AVIATION.  
 
A WEST WIND OF 10-20 KNOTS THIS AFTERNOON WILL FADE TO CALM THIS  
EVENING SHORTLY AFTER SUNSET. LIGHT WINDS WILL CONTINUE THEN  
THROUGH 18Z ON THURSDAY.  
 

 
   
MARINE
 
 
ISSUED AT 330 PM EDT WED AUG 5 2020  
 
WIND THIS MORNING ON THE ORDER OF 10-20 KNOTS RESULTED IN SOME  
2-3 FOOTERS IN PORTIONS OF OUR NEARSHORE INTO THE MIDDAY HOURS.  
THESE WAVES SHOULD DAMPEN OUT AND DIMINISH AS WE MOVE THROUGH THE  
REST OF THE AFTERNOON INTO THE EARLY EVENING. WINDS OVER THE  
COURSE OF THE NEXT FEW DAYS ARE QUITE LIGHT, UNDER 10 KNOTS  
THROUGH FRIDAY. THEREFORE, WE ARE NOT EXPECTING ANY SMALL CRAFT  
CONDITIONS OR BEACH HAZARD WORRIES OVER THE COURSE OF THE NEXT  
COUPLE OF DAYS. THE NEXT CHANCE FOR DECENT WIND WILL COME ON  
SATURDAY NIGHT AS SOUTH WINDS INCREASE.  
 

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

 
 

 
 
SYNOPSIS...DUKE  
DISCUSSION...DUKE  
AVIATION...DUKE  
MARINE...DUKE  
 
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