Hawaii Extended Forecast Discussion NWS Weather Prediction Center College Park MD 816 AM EDT Fri Apr 08 2016 Valid 00Z Sat Apr 09 2016 - 00Z Sat Apr 16 2016 Latest blended precipitable water loops indicate that the moisture axis associated with the tail end of a old cold front has lifted gradually back across the islands. The enhanced values upwards to 1.5" or 150+ pecrent of normal could fuel a few locally heavy downpours today. Precipitation will slowly wane over the weekend as available moisture decreases. A favored composite of models and ensembles generally agree that surface high pressure to move eastward along 30N Sat-Wed and strengthen with time. GFS/GEFS remains a bit quicker to strengthen the high than the ECMWF/ECENS mean due to timing differences toward Alaska over the northeastern Pacific. A multi-model/ensemble blend should suffice as both ensemble systems remain very close with respect to the increase in heights near Hawaii next week, but a mean weakness may linger over/East of the state. Trades will be on the increase next week as the gradient increases due to the modestly strong mean high pressure/gradient in a rainfall pattern favoring windward terrain. Schichtel/Chenard