Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
324 AM EDT Fri Aug 18 2023

Valid 00Z Sat Aug 19 2023 - 00Z Sat Aug 26 2023

The overall weather pattern across the Hawaii domain is expected
to be relatively uneventful Friday through most of Sunday with
mainly moderate trade winds from the ENE expected and windward
showers across the southeastern Islands.  By Sunday night,
attention then turns to the approaching remnants of T.S. Fernanda,
with the model guidance continuing to suggest the main trough axis
will pass south of the Big Island Monday afternoon.  However, the
northern periphery will likely encompass locations from Oahu to
the Big Island with PWs rising near to slightly above 2 inches,
and heavy showers and a few thunderstorms, mainly on Monday into
Monday night with the potential for several inches of rainfall
that could result in some flooding issues. 

In the wake of this will be a return to more seasonal levels of
atmospheric moisture and trade wind enhanced showers.  Trades will
return to a generally easterly direction by Tuesday and beyond at
speeds of 10-20 mph in most cases with the main subtropical high
remaining well north of the state near 40N/150W. 

Hamrick