Hawaii Extended Forecast Discussion NWS Weather Prediction Center College Park MD 829 AM EDT Sat Aug 19 2017 Valid 00Z Sun Aug 20 2017 - 00Z Sun Aug 27 2017 Models and ensembles reasonably agree that an inverted upper trough will slide slowly westward over the islands over the next couple of days. Weakened trades should provide tropical mositure and the potential for some enhanced shower activity. High pressure building to the north of the state favors increasing trade flow by Tuesday that should hold throughout the rest of the week. This pattern will offer decreasing moisture with lingering rainfall mainly confined to windward terrain. Schichtel