143  
FXPQ60 PGUM 221943  
AFDPQ  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE TIYAN GU  
545 AM CHST SAT SEP 23 2017  
   
MARIANAS SYNOPSIS
 
 
SCATTERED CLOUDS AND ISOLATED SHOWERS PREVAILED ACROSS THE  
MARIANAS EARLY THIS MORNING. COMBINED SEAS WERE MAINLY 3 TO 5  
FEET.  
 

 
   
DISCUSSION
 
 
UPPER LEVEL LOW PRESSURE WAS MOVING AWAY FROM THE AREA, WHILE A  
SURFACE TROUGH TO THE SOUTHEAST WAS MOVING IN. THIS TROUGH WILL  
MOVE WESTWARD OVER THE WEEKEND. THE MAJORITY OF THE RAIN SHOULD  
REMAIN SOUTH OF GUAM, HOWEVER, THE TROUGH WILL BE CLOSE ENOUGH TO  
BRING ISOLATED SHOWERS AND THUNDERSTORMS TO THE MARIANAS OVER THE  
WEEKEND. ANOTHER TROUGH AND AND UPPER LOW MOVING TO THE NORTH WILL  
KEEP THE ISOLATED THUNDERSTORMS THROUGH MONDAY NIGHT. COMBINED  
SEAS SHOULD REMAIN IN THE 3 TO 4 OR 3 TO 5 FOOT RANGE FOR THE NEXT  
SEVERAL DAYS.  
 

 
   
EASTERN MICRONESIA
 
 
A SURFACE TROUGH NEAR CHUUK CONTINUES TO MOVE AWAY FROM THE  
REGION. CLOUDS HAVE CLEARED OUT FOR THE MOST PART AT MAJURO AND  
KOSRAE, BUT CLOUDS AND A FEW SHOWERS AND THUNDERSTORMS REMAIN NEAR  
POHNPEI. THE CHANCE OF THUNDERSTORMS WILL GRADUALLY DIMINISH  
TONIGHT WITH ONLY ISOLATED SHOWERS EXPECTED BY SUNDAY. THE REGION  
WILL SEE FAIR WEATHER THE NEXT DAY OR SO BEFORE WEAK TRADE-WIND  
CONVERGENCE AND ANOTHER SURFACE TROUGH BRING MORE CLOUDS AND A FEW  
MORE SHOWERS BEGINNING SUNDAY AT MAJURO, AND SUNDAY NIGHT AT  
KOSRAE AND POHNPEI. DRIER TRADES WILL RETURN AROUND MIDWEEK.  
 

 
   
WESTERN MICRONESIA
 
 
QUIET WEATHER REMAINS AT YAP AND KOROR THIS MORNING, BUT AN  
APPROACHING TROUGH WILL BRING INCREASING CLOUDS, SHOWERS AND  
THUNDERSTORMS LATER TODAY AT YAP AND OVERNIGHT AT KOROR. AFTER A  
BRIEF LULL AROUND MONDAY, ANOTHER TROUGH WILL BRING MORE SHOWERS  
AND THUNDERSTORMS TO THE TWO LOCATIONS BY TUESDAY. AT CHUUK, THE  
BULK OF SHOWERS HAS PASSED NOW THAT THE TROUGH AXIS IS TO THE  
WEST. MORE CONVECTION IS SEEN IN THE AREA, BUT MOST IS TO THE  
NORTH. CHUUK COULD STILL SEE A FEW THUNDERSTORMS TODAY. DRIER  
WEATHER SEEN TO THE EAST WILL OVERSPREAD THE AREA BY THE FIRST OF  
THE WEEK BEFORE CLOUDS INCREASE FROM ANOTHER SURFACE TROUGH.  
 

 
   
GUM WATCHES/WARNINGS/ADVISORIES
 
 
GU...NONE.  
MARIANAS WATERS...NONE.  

 
 

 
 
NIERENBERG/W. AYDLETT  
 
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