Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
312 AM EST Fri Dec 27 2019

Valid 00Z Sat Dec 28 2019 - 00Z Sat Jan 04 2020

A dissipating cold front and its associated moisture field will
continue to support scattered showers across mainly the Big Island
into Saturday. A more typical and breezy trade wind pattern should
return this weekend as high pressure builds north and east of
Hawaii with isolated showers possible along favored windward
facing terrain. Models continue to show general agreement that a
shortwave should amplify northwest of Hawaii during the middle of
next week sending a cold front towards the western islands. An
increase in showery activity can be expected, though models show
differing opinions on the intensity of the moisture plume and
associated rainfall amounts. The 00z ECMWF seems to be the most
amplified with this troughing while the GFS and ensemble means are
weaker and more progressive.

Santorelli