440  
FXHW01 KWNH 201215  
PMDHI  
 
HAWAII EXTENDED FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
714 AM EST SAT JAN 20 2018  
 
VALID 00Z SUN JAN 21 2018 - 00Z SUN JAN 28 2018  
 
A TRANSITIONAL FLOW PATTERN WILL PERSIST OVER THE NEXT FEW DAYS AS  
WEAK SHORTWAVES APPROACHING FROM THE WEST GRADUALLY LOWER HEIGHTS  
OVER THE ISLANDS. RENEWED SURFACE HIGH PRESSURE BRIDGING TO THE  
NORTH OF THE STATE WILL SUPPORT MODERATE TRADES IN A PATTERN WITH  
SOME RETURNING MOISTURE AND SCATTERED SHOWERS.  
 
MODEL AND ENSEMBLE FORECAST SPREAD AND UNCERTAINTY HAS DECREASED  
OVER THE PAST FEW GUIDANCE RUNS AND GENERALLY AGREES TO THEN  
PROGRESS AN AMPLIFIED MID-UPPER LEVEL TROUGH AND A DEEP SURFACE  
LOW TO THE NORTHWEST OF THE STATE INTO MID-LATE NEXT WEEK. A  
FAVORED GUIDANCE COMPOSITE OFFERS POTENTIAL FOR A PRECIPITATION  
FOCUSING TRAILING COLD FRONT TO APPROACH THE WESTERN ISLANDS LATE  
WEEK.  
 
SCHICHTEL  
 

 
 
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