081  
FXHW01 KWNH 151227  
PMDHI  
 
HAWAII EXTENDED FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
726 AM EST MON JAN 15 2018  
 
VALID 00Z TUE JAN 16 2018 - 00Z TUE JAN 23 2018  
 
AN UPPER RIDGE NORTH OF THE STATE WILL SLIDE EASTWARD OVER TIME  
THIS WEEK AND GENERALLY ALLOW SURFACE HIGH PRESSURE TO BE IN  
CONTROL ACROSS HAWAII. INITIALLY A DECENT COMPACT LOW PRESSURE  
SYSTEM NORTH OF THE STATE WILL REMAIN NORTH, PULL AWAY AND PERHAPS  
ALLOW A FRONTAL ZONE TO DROP SOUTH TOWARD OR THROUGH THE ISLANDS.  
VERY LITTLE IN SHOWER ACTIVITY IS ANTICIPATED WITH THIS FRONTAL  
ZONE AND THIS ALLOWS THE SURFACE RIDGE TO BUILD IN. EXPECT BRISK  
LOW-LEVEL EAST TO EAST-NORTHEAST TRADES TO RESUME AND MOST OF THE  
DEEPEST TROPICAL MOISTURE REMAINING SUPPRESSED TO THE SOUTH.  
FINALLY BY THE WEEKEND, THE UPPER RIDGE FILLS SOME AND THE FLOW  
BECOMES RELATIVELY LIGHT. THIS SHOULD ALLOW A SURGE IN TROPICAL  
MOISTURE WITH ABOVE 1 INCH PWS TO CREEP NORTH, WHICH MAY ALLOW  
SOME MORE WIDESPREAD INSTABILITY SHOWERS.  
 
MUSHER  
 

 
 
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