660  
FXHW01 KWNH 151231  
PMDHI  
 
HAWAII EXTENDED FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
730 AM EST WED NOV 15 2017  
 
VALID 00Z THU NOV 16 2017 - 00Z THU NOV 23 2017  
 
THE MAIN SYNOPTIC SYSTEM IMPACTING THE WEATHER ACROSS HAWAII  
DURING THE FORECAST PERIOD WILL BE AN UPPER-LEVEL CUT-OFF/CLOSED  
LOW IN THE HIGHER LATITUDES WHICH IS FORECAST TO DROP SOUTH TO  
APPROXIMATELY 30N...150W DURING THE WEEKEND BEFORE PULLING OUT  
FURTHER TO THE NORTHEAST AS A POSITIVELY TILTED TROUGH BY EARLY  
NEXT WEEK. MODEL GUIDANCE THIS MORNING CONTINUES TO SHOW FAIRLY  
GOOD AGREEMENT ON THIS SCENARIO. ALTHOUGH THE ECMWF MAINTAINS A  
FASTER EASTWARD PROGRESSION OF THIS TROUGH BY EARLY NEXT WEEK,  
HAWAII REMAINS SANDWICHED BETWEEN THE MARINE STRATUS LAYER ON THE  
BACK SIDE OF THIS SYSTEM AND THE PLUME OF TROPICAL MOISTURE WELL  
TO THE SOUTH AND EAST THROUGH THE FORECAST PERIOD. THUS, ONLY  
SCATTERED SHOWERS ARE EXPECTED WITH DECREASING TRADE WINDS AS THE  
SYSTEM APPROACHES DURING THE WEEKEND, FOLLOWED BY GRADUAL  
RESUMPTION OF THE TRADES TOWARD THE MIDDLE OF NEXT WEEK.  
 
KONG  
 

 
 
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