141  
FXHW01 KWNH 211227  
PMDHI  
 
HAWAII EXTENDED FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
826 AM EDT THU SEP 21 2017  
 
VALID 00Z FRI SEP 22 2017 - 00Z FRI SEP 29 2017  
 
A LARGE SCALE UPPER RIDGE NORTH OF THE ISLANDS WILL GRADUALLY  
SHIFT EASTWARD THROUGH THE NORTHEAST PACIFIC THIS WEEKEND  
(EXPECTED TO ALIGN ALONG 145W 00Z FRIDAY AND THEN NEAR 130W BY 00Z  
MONDAY), WHILE A WEAK UPPER LOW REMAINS CENTERED JUST NORTHEAST OF  
THE STATE. AT THE SURFACE, A LARGE DOME OF HIGH PRESSURE EXPANDED  
OVER THE NORTHEAST PACIFIC WILL KEEP EASTERLY TRADES INTACT  
THROUGH THE WEEKEND. MODEL GUIDANCE IS IN GOOD AGREEMENT WITH THE  
LARGE SCALE PATTERN OVER THE NEXT FEW DAYS, AND THE AGREEMENT  
CONTINUES INTO EARLY-MID NEXT WEEK AS THE UPPER RIDGE CONTINUES TO  
PROGRESS EASTWARD AND AN UPSTREAM TROUGH BRINGS A COLD FRONT NORTH  
OF THE ISLANDS.  
 
GERHARDT  
 

 
 
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