Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
806 AM EDT Sun Sep 10 2017

Valid 00Z Mon Sep 11 2017 - 00Z Mon Sep 18 2017

Aside from small scale details that have low predictability,
guidance agrees well with the overall forecast through the period.
 Trades are in the process of weakening and should remain fairly
light into Thursday.  This weak wind pattern will be associated
with an upper trough settling north of the state into midweek,
reflecting at the surface as a wavy front that stalls just north
of the area.  Through at least Wednesday rainfall should be
influenced by land/sea breezes given the light prevailing flow. 
Some isolated/localized heavy amounts may be possible through
Tuesday with pockets of precipitable water values exceeding 1.50
inches.

From late week onward the pattern will transition back to a trade
flow regime with somewhat drier air filtering in from the east and
a ridge aloft also building over the area.  As a result showers
will likely trend somewhat lighter with increased emphasis on
windward terrain.  High pressure building across the central
Pacific next weekend should bring trades up to at least moderate
strength by next Sunday.

Rausch