Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
849 AM EDT Fri Jun 25 2021

Valid 00Z Sat Jun 26 2021 - 00Z Sat Jul 03 2021

The guidance agrees that anomalous troughing north of the 50th
state caused by a series of deep cyclones near the Aleutians
causing a front/shearline to stall over the Papahanaumokuakea
National Marine Monument and -- initially -- a positively tilted
trough extending towards the island chain leads to an initially
weak north-south subtropical ridge offshore the West Coast of the
lower 48 which initially lead to the resultant trades should
weaker than average.  As the upper trough northeast of the islands
pulls away and the front/shearline in the northwest islands
disintegrates on Sunday, the trades should regain some strength as
a surface high offshore western North American slowly builds and
reorients northeast-southwest to the north of Hawai'i.  This
caused the trade winds to return to moderate levels and renew a
pattern with windward terrain/mountain focusing showers next week.

Roth