Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
301 AM EDT Sat Apr 5 2025

Valid 00Z Sun 6 Apr 2025 - 00Z Sun 13 Apr 2025

A trailing frontal boundary extending southward from a large
occluded low pressure system well to the north of Hawaii is
expected to reside over the northwestern Islands on Saturday, and
then gradually wash out going into Sunday. Surface high pressure 
then rebuilds northwest of the state near 30-35 degrees north, 
with mainly ENE trade wind flow expected, and then the high
becomes centered north of the state by Friday. This likely 
remains the case into the middle to end of next week, with good 
overall model agreement across the Hawaii domain.

In terms of rainfall prospects, most of the mainly light to
moderate showers with the stationary front through this weekend
should be mainly north and west of Honolulu, and typical trade
wind showers extending southeast to the Big Island. The ensemble
means suggest an upper trough could develop near 150 degrees west
by midweek, and this may result in a slightly greater coverage of
showers during this time.

Hamrick