Hawaii Extended Forecast Discussion NWS Weather Prediction Center College Park MD 729 AM EST Sat Dec 22 2018 Valid 00Z Sun Dec 23 2018 - 00Z Sun Dec 30 2018 Expect seasonal trade winds over the next few days as high pressure settles to the northeast of the state and an upper level low retrogrades in from the east. This pattern only supports limited windward showers through Monday. However, there is an increasing guidance signal supporting wetter pattern development from Tuesday onward as a pair of shortwave troughs move by to the north lures the retrograding upper level low underneath work over the state and as a cold front approaches from the northwest. A favored composite of reasonably well clustered models and ensembles indicates that deeper moisture may return in advance of the front. This developing wet pattern may be further enhanced by next Fri-Sat as another pooling moisture front is expected to reach the islands from the northwest with amplification and approach of a mid-upper level trough/closed low. Schichtel