Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
750 AM EDT Mon Oct 10 2016

Valid 00Z Tue Oct 11 2016 - 00Z Tue Oct 18 2016

The models continue to advertise an expanding deep layer mean
ridge initially northwest of the islands that builds norther of
the islands as the week progresses, then northeast of the islands
early next week.
As this occurs, the primary moisture channel will be confined
south of the islands, with forecast precipitable water values
below normal through the rest of the week.

At the surface, a gradual increase in the anticyclone strength
will enhance the pressure gradient across the region which favors
an increase in the trade winds. Multiple models show periods of
sustained low-level winds of 20 knots with locally higher gusts.
Widely scattered showers should focus in windward areas and
regions of upslope flow. Coverage should be somewhat limited by
the lower end moisture content available. The gfs and ecmwf hint
an approaching tropical wave early next week, which would act to
advect more moisture into the islands. 

Petersen