Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
729 AM EST Wed Jan 17 2018

Valid 00Z Thu Jan 18 2018 - 00Z Thu Jan 25 2018

Upper ridging will continue through most of the forecast period
over Hawai'i--with a trough sliding northward over the region by
the end of the week. This trough could bring the tail end of a
front to the northern islands by Sunday.  Ahead of this front,
expect an increase in showers beginning on Friday onward into
Sunday.  By next week, another trough will dig northwest of
Hawai'i--with deterministic GFS/ECMWF showing an upper low still
centered below 40N near 170W by Wednesday morning.  However, the
06Z GFS seems much more aggressive with this upper low and slower
with the associated front--which seems to be the outlier solution.
Expect generally light showers ahead of this system as trade winds
prevail. 

Reinhart