Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
816 AM EDT Mon Aug 27 2018

Valid 00Z Tue Aug 28 2018 - 00Z Tue Sep 04 2018

...Heavy rainfall/flooding threat persists into early this week as
Tropical Storm Lane weakens and moves westward...

As of the 0900 UTC advisory from the Central Pacific Hurricane
Center,Tropical Depression Lane will continue to weaken as its
tracks west of the Islands. The cyclone is forecast to accelerate
northwestward on Tuesday and Wednesday; which will clip the
northwestern islands as a post-tropical remnant low.  In spite of
Lane's departure the guidance is consistent in showing that areas
of heavy rainfall should continue over the islands early this week
as high precipitable water values persist, with a slow drift from
east to west.  Flow around a strong and massive eastern Pacific
surface high will maintain moderate to brisk trades that will
serve to enhance rainfall over windward terrain.

Tropical Storm Miriam, currently located near 14N and 130W, is
forecast by the National Hurricane Center to strengthen to a
hurricane by late Monday night. Its forecast track at this time is
nearly due west before turning northwest upon reaching 140W. Model
solutions suggest that this particular system will not directly
impact the Islands. Some moisture on the southeast side of this
feature may reach the Big Island and vicinity late in the weekend.
 However guidance suggests that flow around the upper low should
keep greater deep moisture associated with current Tropical Storm
Miriam well to the east/northeast of the state through next
weekend.  Also trades should weaken somewhat next weekend with the
close proximity of the upper low.

Campbell