Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
255 AM EDT Sun Jul 20 2025

Valid 00Z Mon 21 Jul 2025 - 00Z Mon 28 Jul 2025

The main subtropical surface high over the eastern Pacific will be
positioned well north of the Islands going into next week, 
generally between 40 and 45 degrees north. The state will be on 
the far southern periphery of this high, and this will keep a 
general easterly low level flow in place, with some backing to the
northeast at times through the next 7 days. The models agree that
the overall pressure gradient will weaken some going into the
middle to end of the week, and a lighter trade wind flow as a
result. The ensemble means are in good synoptic scale agreement 
on the overall pattern.

In terms of rainfall prospects, there may be a slight increase in
showers across the Islands through Monday morning owing to a weak
upper level trough over the region, but otherwise the normal 
trade wind induced showers can be expected through the remainder 
of the week with no major rainfall events expected.


Hamrick