Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
818 AM EDT Sat Sep 16 2017

Valid 00Z Sun Sep 17 2017 - 00Z Sun Sep 24 2017

Ensembles remain in good agreement on the large scale flow over
the central Pacific next week. Strong upper/sfc high to the north
of the region will slide eastward and weaken which will allow a
weakness aloft to move westward and then northwestward around the
high's circulation. Trades will be higher than average for the
next few days due to the strong pressure gradient but relax late
in the week as the 1031 mb sfc high moves east of 150W by next
weekend. The island chain should remain in between the axis of
moisture to the northwest of the area and the ITCZ, but the models
so show the possibility of temporary increased moisture to at
least the Big Island mid/late week next week. Generally,
windward/mauka showers are expected (though some leeward as well
given breezy trades) with generally light accumulations but some
higher amounts may be possible on the Big Island.


Fracasso