805  
FXUS63 KGRR 272346  
AFDGRR  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE GRAND RAPIDS MI  
746 PM EDT TUE SEP 27 2022  
 
LATEST UPDATE...  
AVIATION  
   
DISCUSSION
 
(THIS EVENING THROUGH NEXT TUESDAY)  
ISSUED AT 305 PM EDT TUE SEP 27 2022  
 
FORECAST CONCERNS CENTER AROUND COLD TEMPERATURES FOR WEDNESDAY  
NIGHT. SURFACE HIGH BUILDING IN SHOULD MEAN CLOUDS AND WINDS WILL  
DECREASE ALLOWING GOOD RADIATIONAL COOLING WHICH, COMBINED WITH  
COLD AIRMASS, WILL LEAD TO WIDESPREAD FROST AND SOME FREEZING  
TEMPERATURES.  
 
THE SET UP IS SIMILAR TO THE COLD MORNING OF SEPTEMBER 23RD, WITH  
LOWS POTENTIALLY A DEGREE OR TWO COLDER. WE HAVE LOWERED MIN  
TEMPS WITH THIS FORECAST AND NOW HAVE A MORE EXPANSIVE AREA OF  
UPPER 20S ACROSS THE NORTHERN INTERIOR ZONES WITH LOWER 30S ACROSS  
THE CENTRAL ZONES AND MID 30S ACROSS THE SOUTH. WITH CLEAR SKIES  
AND LIGHT WINDS, AREAS OF FROST ARE EXPECTED IN MOST AREAS.  
TEMPERATURES MAY BE COLD ENOUGH FOR LONG ENOUGH TO END THE  
GROWING SEASON ACROSS PART OF THE NORTHERN INTERIOR CWA.  
 
SURFACE HIGH MOVES EAST ON THURSDAY BUT AIRMASS IS STILL COOL AND  
DRY AND MOSTLY CLEAR SKIES WILL MEAN AT LEAST PATCHY FROST WITH  
TEMPERATURES FALLING INTO THE MID TO UPPER 30S.  
 
MODERATING TEMPERATURES FOR THE WEEKEND AS HEIGHTS RISE WITH THE  
HURRICANE REMNANT RAINS MAKING IT AS FAR NORTH AS THE OHIO VALLEY  
BUT NOT INTO LOWER MICHIGAN AS WESTERLY FLOW EVENTUALLY PUSHES IT  
AWAY AND OFF THE ATLANTIC COAST.  
 

 
   
AVIATION
 
(FOR THE 00Z TAFS THROUGH 00Z WEDNESDAY EVENING)  
ISSUED AT 740 PM EDT TUE SEP 27 2022  
 
AN AREA OF LOWER CLOUDS AND SHOWERS DROPPING DOWN FROM THE NORTH  
WAS PRODUCING MAINLY MVFR CONDITIONS FOR THE TAF SITES TO START  
THE PERIOD. THE MAIN SUPPORT FOR THE SHOWERS SHIFTS SOUTH OF THE  
TAF SITES OVERNIGHT AND THIS WILL ALLOW FOR SLIGHT DRYING...WHICH  
IN TURN COULD SUPPORT A TREND TOWARD VFR CONDITIONS. FURTHER  
DRYING IS PREDICTED FOR WEDNESDAY SO WHILE CLOUD COVER WILL LIKELY  
BE BROKEN...VFR LEVELS WILL LIKELY PREVAIL DURING THE DAY.  
 

 
   
MARINE
 
 
ISSUED AT 305 PM EDT TUE SEP 27 2022  
 
NO CHANGES TO ONGOING SCA AS WINDS AND WAVES WILL CONTINUE  
ELEVATED OVERNIGHT BEFORE DECREASING ON WEDNESDAY.  
 

 
   
GRR WATCHES/WARNINGS/ADVISORIES
 
 
MI...BEACH HAZARDS STATEMENT THROUGH WEDNESDAY MORNING FOR MIZ037-043-  
050-056-064-071.  
 
LM...SMALL CRAFT ADVISORY UNTIL 11 AM EDT WEDNESDAY FOR LMZ844>849.  
 

 
 

 
 
DISCUSSION...OSTUNO  
AVIATION...MJS  
MARINE...OSTUNO  
 
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