665  
FXHW01 KWNH 171231  
PMDHI  
 
HAWAII EXTENDED FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
730 AM EST FRI NOV 17 2017  
 
VALID 00Z SAT NOV 18 2017 - 00Z SAT NOV 25 2017  
 
THE MAIN SYNOPTIC-SCALE SYSTEM IMPACTING THE WEATHER ACROSS HAWAII  
DURING THE FORECAST PERIOD WILL BE A CUT-OFF/CLOSED LOW WHICH HAS  
CONTINUED TO DROP SOUTHWARD FROM THE HIGHER LATITUDES TOWARD  
HAWAII. MODEL GUIDANCE AGREES THAT A COLD ASSOCIATED WITH THIS  
SYSTEM WILL PASS THROUGH THE HAWAIIAN ISLAND CHAIN ON SATURDAY  
WITH A BRIEF PERIOD OF ENHANCED SHOWERS POSSIBLE, FOLLOWED BY  
WINDS SHIFTING TO MORE WEST TO NORTHWESTERLY DIRECTIONS. SOME  
POST-FRONTAL SHOWERS CAN BE EXPECTED AT TIMES ON SUNDAY AS THE  
MARINE LAYER ON THE BACK SIDE OF THE VORTEX WILL APPEAR TO MOVE  
INTO THE AREA. THE CYCLONE SHOULD BEGIN TO PULL OUT ON MONDAY AS  
IT GRADUALLY OPENS UP AS A POSITIVELY TILTED TROUGH FURTHER TO THE  
NORTHEAST. THEREAFTER, MODELS AGREE THAT A SUBTROPICAL HIGH WILL  
SLOWLY BUILD SOUTHEASTWARD INTO THE REGION WITH A GRADUAL  
RESUMPTION OF THE TRADE WINDS TOWARD THE MIDDLE OF NEXT WEEK.  
MODELS NO LONGER INDICATE THE POSSIBILITY OF TROPICAL MOISTURE  
APPROACHING FROM THE SOUTH LATER NEXT WEEK. HOWEVER, THEY BEGIN  
TO INDICATE THE POSSIBILITY OF ANOTHER CUT-OFF LOW FORMING ABOUT A  
FEW HUNDRED MILES NORTHEAST OF HAWAII TOWARD NEXT WEEKEND.  
 
KONG  
 

 
 
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