Hawaii Extended Forecast Discussion NWS Weather Prediction Center College Park MD 828 AM EDT Sun Aug 20 2017 Valid 00Z Mon Aug 21 2017 - 00Z Mon Aug 28 2017 Latest guidance is fairly well clustered and offers at or above normal predictability for the upcoming week. It remains the case that an inverted upper trough will slide slowly westward over the islands over the next couple of days. Weakened trades should still provide tropical mositure and the potential for some enhanced shower activity. High pressure building to the north of the state will favor increasing trade flow by Tuesday that should hold throughout the rest of the week. This pattern though will offer decreasing moisture with limited rainfall mainly confined to windward terrain under mean ridging aloft. Schichtel