HAWAII EXTENDED FORECAST DISCUSSION NWS WEATHER PREDICTION CENTER COLLEGE PARK MD 727 AM EDT TUE AUG 27 2013 VALID 00Z WED AUG 28 2013 - 00Z WED SEP 04 2013 THE LATEST MODEL/ENSEMBLE GUIDANCE SHOWS AN UPPER LEVEL TROUGH WITH A WEAK SFC-700 MB REFLECTION PASSING FROM EAST TO WEST MID-LATE WEEK. SURFACE TRADES WEAKEN AS THE LOW LEVEL TROUGH APPROACHES AND PASSES THROUGH. EXPECT AN INCREASE PRECIPITABLE WATER VALUES AS THE DEEP LAYER TROUGH CROSSES MID-LATE WEEK WITH AN UPTICK IN SHOWERS OVER THE REGION. AS THE DEEP LAYER TROUGH MOVES WEST OF THE ISLANDS...PRECIPITABLE WATER VALUES DECLINE AGAIN AND TRADES SHOULD RETURN TO NEAR NORMAL LEVELS FRI-MON. WITH PRECIPITABLE WATER VALUES AVERAGE NEAR 1 STD DEVIATION BELOW NORMAL OVER THE WEEKEND INTO EARLY NEXT WEEK SHWRS WILL LIKELY REDUCE IN COVERAGE/INTENSITY. THE FEW SHOWERS SHOULD BE MORE TERRAIN FOCUSED AS A DEEP LAYER RIDGE BUILDS NORTH OF THE ISLANDS OVER THE WEEKEND INTO EARLY NEXT WEEK. PETERSEN