834  
FXHW01 KWNH 231241  
PMDHI  
 
HAWAII EXTENDED FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
741 AM EST TUE JAN 23 2018  
 
VALID 00Z WED JAN 24 2018 - 00Z WED JAN 31 2018  
 
SURFACE HIGH PRESSURE NORTH/NORTHEAST OF THE ISLANDS SHOULD  
SUPPORT MODERATE TRADES THROUGH THE MIDDLE OF THE WEEK, BUT THEN A  
COLD FRONT WILL APPROACH FROM THE NORTHWEST AS SHORTWAVE ENERGY  
LIFTS NORTHEASTWARD (NORTHWEST OF THE ISLANDS) ON FRIDAY. MODEL  
SPREAD THEN BEGINS TO INCREASE WITH A WEAK UPPER TROUGH POSSIBLY  
ALIGNING OVER THE ISLANDS THIS WEEKEND. THE GFS/GEFS MEAN ARE  
CURRENTLY MORE AMPLIFIED WITH THIS FEATURE AND HOLD ONTO TROUGHING  
LONGER THAN THE ECMWF/ECMWF ENSEMBLE MEAN.  
 
GERHARDT  
 

 
 
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