Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
201 AM EDT Wed Oct 20 2021

Valid 00Z Thu Oct 21 2021 - 00Z Thu Oct 28 2021

Hawaii and adjacent waters will be within a col in the subtropical
ridge as a weakening front approaches and stalls to the north,
thus resulting in weaker winds and some development of sea breezes
during the day.  By Friday and going into the weekend, the ridge
settles back in near 30-35 degrees north and increases the
pressure gradient of the state along with stronger trades. 
Towards the end of the forecast period, both the ECENS and GEFS
mean are indicating the potential for another break in the ridge
over the northwestern Islands by the middle of next week.

Aloft, a weak upper level trough is expected to pass south of the
state on Friday followed by upper level ridging by the weekend and
beyond.  There may be some enhanced showers across windward
terrain on Saturday and into early Sunday, but overall no major
rainfall events are currently anticipated over the upcoming week
as deep tropical moisture remains confined south of 20 degrees
north.

Hamrick