Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
157 AM EDT Fri Sep 17 2021

Valid 00Z Sat Sep 18 2021 - 00Z Sat Sep 25 2021

The upper level ridge initially centered north of Hawaii late this
week will build in over the state through the upcoming weekend,
with the main subtropical surface high remaining anchored in place
to the north.  A col in the ridge axis may develop early next week
to the east of the Big Island, with perhaps 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 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