Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
233 AM EDT Sat Sep 18 2021

Valid 00Z Sun Sep 19 2021 - 00Z Sun Sep 26 2021

Upper level ridging will be in place this weekend across Hawaii,
with the main surface high remaining anchored in place between 35
and 40 degrees north.  A col in the ridge axis is forecast to
develop early next week to the east of the Big Island, with an
inverted trough axis moving westward across the state.  Both the
GEFS and ECENS means are in good overall agreement across the
Hawaii domain.

It appears the greatest moisture and rainfall associated with the
potential trough early next week should remain a few hundred miles
south of the Islands, although the typical trade wind based
showers are likely each day.  Easterly winds on the order of 15 to
25 mph should prevail for most of the upcoming week.

Hamrick