Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
726 AM EST Mon Jan 15 2018

Valid 00Z Tue Jan 16 2018 - 00Z Tue Jan 23 2018

An upper ridge north of the state will slide eastward over time
this week and generally allow surface high pressure to be in
control across Hawaii. Initially a decent compact low pressure
system north of the state will remain north, pull away and perhaps
allow a frontal zone to drop south toward or through the islands.
Very little in shower activity is anticipated with this frontal
zone and this allows the surface ridge to build in. Expect brisk
low-level east to east-northeast trades to resume and most of the
deepest tropical moisture remaining suppressed to the south.
Finally by the weekend, the upper ridge fills some and the flow
becomes relatively light. This should allow a surge in tropical
moisture with above 1 inch PWs to creep north, which may allow
some more widespread instability showers.

Musher