Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
819 AM EDT Mon Apr 10 2017

Valid 00Z Tue Apr 11 2017 - 00Z Tue Apr 18 2017

Expect an increase in wet weather across mainly the western and
central Islands by the middle of this week as an upper level
shortwave slides across or just to the north of the state Tuesday
through Friday. Even though the surface front itself looks to
remain north of the state, instability aloft and increasing
moisture in the lower and middle levels should be enough to fuel
moderate to locally heavy showers. While there is good agreement
synoptically, the operational 06z GFS continues to show a better
signal for resulting rainfall across the state than the latest 00z
ECMWF. However, given the overall setup, the potential is
definitely there for a solution closer to that of what the GFS is
depicting. By next weekend, the upper shortwave moves east of the
state and the mean upper ridge returns which should bring about
drier conditions and a relaxing of the trade winds.  

Santorelli