Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
823 AM EDT Mon Jun 17 2019

Valid 00Z Tue Jun 18 2019 - 00Z Tue Jun 25 2019

A large surface high builds to the northeast of Hawai'i for the
beginning of the week as a large scale trough drops southward from
the Aleutians, and another high becomes anchored in place near
165E.  An inverted surface trough develops in the general vicinity
of 160W early in the week in response to the building upper level
trough, supporting a quasi-stationary frontal zone and surface low
to the northwest of the state.  There will likely be a second
inverted trough developing by Friday in the same general vicinity
as the earlier one, and may be stronger and have more of an effect
on surface winds, based on the latest GEFS and EC mean solutions. 
There is also the potential for a cut-off upper low developing in
conjunction with this.

It appears that the greatest moisture flux ahead of these
disturbances should remain northwest of the state through the
upcoming week, with the western-most islands having an increased
chance of showers.  Elsewhere, expect typical trade wind showers
across the favored terrain through the week.

Hamrick