591  
FXHW01 KWNH 171229  
PMDHI  
 
HAWAII EXTENDED FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
729 AM EST WED JAN 17 2018  
 
VALID 00Z THU JAN 18 2018 - 00Z THU JAN 25 2018  
 
UPPER RIDGING WILL CONTINUE THROUGH MOST OF THE FORECAST PERIOD  
OVER HAWAI'I--WITH A TROUGH SLIDING NORTHWARD OVER THE REGION BY  
THE END OF THE WEEK. THIS TROUGH COULD BRING THE TAIL END OF A  
FRONT TO THE NORTHERN ISLANDS BY SUNDAY. AHEAD OF THIS FRONT,  
EXPECT AN INCREASE IN SHOWERS BEGINNING ON FRIDAY ONWARD INTO  
SUNDAY. BY NEXT WEEK, ANOTHER TROUGH WILL DIG NORTHWEST OF  
HAWAI'I--WITH DETERMINISTIC GFS/ECMWF SHOWING AN UPPER LOW STILL  
CENTERED BELOW 40N NEAR 170W BY WEDNESDAY MORNING. HOWEVER, THE  
06Z GFS SEEMS MUCH MORE AGGRESSIVE WITH THIS UPPER LOW AND SLOWER  
WITH THE ASSOCIATED FRONT--WHICH SEEMS TO BE THE OUTLIER SOLUTION.  
EXPECT GENERALLY LIGHT SHOWERS AHEAD OF THIS SYSTEM AS TRADE WINDS  
PREVAIL.  
 
REINHART  
 

 
 
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