HAWAII EXTENDED FORECAST DISCUSSION NWS HYDROMETEOROLOGICAL PREDICTION CENTER COLLEGE PARK MD 727 AM EST THU FEB 21 2013 VALID 00Z FRI FEB 22 2013 - 00Z FRI MAR 01 2013 STRONG SURFACE HIGH PRESSURE POSITIONED NORTH OF THE ISLANDS WILL CONTINUE TO SUPPORT BRISK TRADE WINDS THROUGHOUT THE FORECAST PERIOD. ALOFT, THE OPERATIONAL GFS, ECMWF, AND THEIR ENSEMBLE PACKAGES SUPPORT TROUGHING JUST NORTHEAST AND EAST OF THE BIG ISLAND THROUGH DAY 5, BEFORE SLIGHT HEIGHT RISES MIGRATE EASTWARD AHEAD OF A MID-LATITUDE LONGWAVE TROUGH OVER THE ALEUTIANS. WITH LITTLE CONTINUITY TO WORK WITH REGARDING THIS DAY 6 LONGWAVE--THE ECMWF TRENDING SLOWER AND THE GFS EXHIBITING ITS FAST BIAS--ANTICIPATE A GRADUAL SLOWDOWN OF THE LONGWAVE APPROACHING FROM THE NORTHWEST, AND RISING HEIGHTS TO LAG BY A DAY OR SO FROM THE CURRENT SOLUTIONS. THE LINGERING LOWER HEIGHTS WILL KEEP SHOWER ACTIVITY IN THE FORECAST. CISCO