Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
817 AM EDT Fri Jun 16 2017

Valid 00Z Sat Jun 17 2017 - 00Z Sat Jun 24 2017

A closed upper low and weakness between two very large subtropical
ridges over the Pacific and currently over the Hawaiian Islands
will slowly retrograde through the upcoming weekend. By doing so,
the 00z gfs and ecmwf continue to show slightly elevated moisture
pool of 1.25" precipitable water values within the best upper
difluence aloft. This may result in more shower activity within
the mean easterly component and trades. By the start of next work
week, a digging upper trough over the central Pacific will allow
the 500mb vort to gain latitude and eventually merge/phase with
the smaller scale feature. Most of the global models keep the
associated frontal zone well northwest of the islands and mainly
trades intact into late next week. 

Musher