Hawaii Extended Forecast Discussion NWS Weather Prediction Center College Park MD 726 AM EST Wed Dec 16 2015 Valid 00Z Thu Dec 17 2015 - 00Z Thu Dec 24 2015 A composite of still reasonably well clustered guidance reasonably indicates that high pressure bridging/building to the north of the state quickly builds island trades to brisk levels for the next week. This will focus a pattern of mainly windward terrain based showers, but an old and weakening boundary sagging southward toward the state this weekend may focus a few showers. Ridge amplification aloft to the north of the islands also allows potential for some mid-upper level troughing to work underneath closer/south of the state early-mid next week that could force deeper moisture from the southeast to fuel some Big Island downpours. Schichtel