Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
200 AM EST Wed Dec 29 2021

Valid 00Z Thu Dec 30 2021 - 00Z Thu Jan 06 2022

A persistent and anomalously strong high pressure, located between
Hawaii and Alaska, will weaken and shift southward by the weekend,
allowing for a trough to enter the region from the west. Gusty
trade winds are expected and windward facing terrain will have
showers during this period. As the trough amplifies a cold front
will move toward the western part of the state ushering in more
southerly winds. These winds will drawl in more moisture northward
by the weekend, that will aid in generating and maintaining
widespread, moderate to locally heavy rains for parts of the
islands.


Campbell