Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
807 AM EDT Thu Aug 31 2017

Valid 00Z Fri Sep 01 2017 - 00Z Fri Sep 08 2017

A low level ridge persists northeast of the islands through the
weekend.  To the northwest of the islands, a slowly approaching
cold front is forecast to only slowly drift southeast towards the
islands over the weekend
and into next week.  Increasing tropical moisture should then
support the chance for increasing showers and thunderstorms,
particularly across the western part of the state where a slow
moving plume of high precipitable water develops.  With the plume
of moisture remaining in place through at least the middle of next
week, scattered showers/storms are expected, with locally heavy
downpours possible.

On Tuesday, the models agree a low level ridge builds north of the
islands, forcing the front into the islands. During the middle and
latter portions of next week, the models/ensemble means are in
better than average agreement on the low level high building north
of Hawaii.  Trades should then return to near normal levels during
this middle to latter portions of next week.

Petersen