Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
232 PM EDT Sat Apr 1 2017

Valid 00Z Sun Apr 2 2017 - 00Z Sun Apr 9 2017

The guidance is in good agreement over the Hawaii domain through
most of the forecast period, with both the EC mean and GEFS mean
indicating a synoptic upper level ridge progressing slowly
eastward across the region.  The operation GFS and ECMWF are also
in good agreement with their respective ensemble means during this
time.  The differences emerge near 40 degrees north, with the GEFS
mean slower with the surface low tracking eastward north of Hawaii
than the EC mean by the middle of next week.  A weak front/shear
line moves into the main islands Tuesday which should weaken out
of existence or retreat by late Wednesday.  This boundary should
lead to slight enhancement to the diurnal shower activity in its
vicinity.  Because of the incursions of the front, trade winds
become weaker from Monday night into Thursday night, before
freshening out of the northeast late Friday. 

Hamrick