Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
730 AM EST Tue Nov 28 2017

Valid 00Z Wed Nov 29 2017 - 00Z Wed Dec 06 2017

...A heavy rain threat continues...

A surface high to the north-northeast of the region should
maintain breezy/windy trades for the next few days and should be
reinforced later in the week as a new high slides to the north of
the state. Deep moisture from the ITCZ is meanwhile surging
northward resulting in the potential for heavy rainfall through
mid-week and flash flood watches are currently in effect over the
Big Island and Maui. A winter storm warning is also in effect for
the summits of Mauna Loa and Mauna Kea where 4-8 inches of snow is
forecast. Another trough and potential surface low will slide
close to or over the western islands into the weekend which should
spread high precipitatble water air to fuel additional heavy
rainfall northwestward. Guidance solutions are better clustered
today, but still offer above normal spread. A model composite is
preferred.

Schichtel