HAWAII EXTENDED FORECAST DISCUSSION NWS WEATHER PREDICTION CENTER COLLEGE PARK MD 755 AM EDT TUE MAY 20 2014 VALID 00Z WED MAY 21 2014 - 00Z WED MAY 28 2014 THE PRIMARY FCST ISSUE THIS PERIOD IS WITH THE EVOLUTION OF AMPLIFYING CNTRL PACIFIC FLOW THAT MOST GUIDANCE SUGGESTS WILL CLOSE OFF AN UPR LOW JUST NW OF THE ISLANDS BY THE WEEKEND WITH THE LOW LINGERING TO THE W/NW OF THE AREA INTO THE FIRST HALF OF NEXT WEEK. CURRENTLY THE 00Z GFS/ECMWF AND THEIR RESPECTIVE MEANS OFFER THE BEST OVERALL CLUSTERING AND FIT TRENDS FROM THE PAST 1-2 DAYS TOWARD A SLOWER/MORE CLOSED SOLN. THE 06Z GFS CLOSED LOW IS TO THE NE OF CONSENSUS. AHEAD OF THIS FEATURE EXPECT AN INITIAL SFC FRONT NW OF THE ISLANDS TO LIFT NWD MID-LATE WEEK. THE FRONT AHEAD OF THE DEVELOPING UPR LOW SHOULD THEN APPROACH THE ISLANDS BUT REMAIN JUST TO THE W... ACHIEVING CLOSEST PROXIMITY AROUND SUN/MON BEFORE GRADUALLY WEAKENING AND RETREATING WWD AS HIGH PRESSURE BUILDING INTO THE NE-CNTRL PAC STRENGTHENS TRADE FLOW. THE PREFERRED MAJORITY SCENARIO SFC/ALOFT WOULD SUPPORT A BAND OF ENHANCED MSTR OVER THE WRN ISLANDS FROM THE WEEKEND INTO EARLY NEXT WEEK... WITH PWATS IN THE 1.5-2.0 INCH RANGE... AND A POTENTIAL FOR SOME PERIODS OF MDT-HVY RNFL ALSO PRIMARILY FOCUSED OVER THE WRN ISLANDS. RAUSCH