HAWAII EXTENDED FORECAST DISCUSSION NWS WEATHER PREDICTION CENTER COLLEGE PARK MD 821 AM EDT FRI APR 19 2013 VALID 00Z SAT APR 20 2013 - 00Z SAT APR 27 2013 AN UPPER LOW INITIALLY SOUTH OF THE ALEUTIANS IS FORECAST TO DROP SOUTHWARD TOWARD 35N/165W BY SUNDAY BEFORE TRAILING ENERGY FROM THE BERING SEA MERGES WITH IT. SFC REFLECTION WILL BE A COLD FRONT THAT SHOULD PUSH THROUGH NW HAWAII LATE SUNDAY INTO MONDAY THEN SLOWLY MOVE SOUTHEASTWARD TOWARD MAUI AND THE BIG ISLAND BY WEDNESDAY... WHICH IS SLOWER THAN WHAT THE GUIDANCE SHOWED YESTERDAY... LIKELY DUE TO THE TRAILING ENERGY. HOWEVER... BOTH THE GFS AND ECMWF ARE IN GOOD AGREEMENT WITH THIS PROGRESSION... WHICH WOULD INCREASE PW VALUES OVER 1.50 INCHES MONDAY AND TUESDAY THROUGH KAUAI INTO OAHU. BY THURSDAY AND FRIDAY THE FRONT AND AXIS OF HIGHER PW VALUES SHOULD LIFT NORTHWESTWARD AS THE FRONT DISSIPATES. SFC HIGH PRESSURE OFF THE OR/CA COAST SHOULD ALLOW EASTERLY TRADES TO RESUME AS DRIER AIR SLOWLY WORKS WESTWARD INTO THE STATE. FRACASSO