Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
231 AM EDT Thu Oct 23 2025

Valid 00Z Fri 24 Oct 2025 - 00Z Fri 31 Oct 2025

Hawaii will generally be on the southern periphery of the main
subtropical high, which should initially be centered near 35
degrees north today. The high realigns through the end of the week
and then becomes positioned north of the state closer to 30
degrees north by Saturday, and this high then moves off towards
the east through early next week. The ensemble means suggest a 
col develops in the ridge axis with a frontal boundary approaching
the northwestern Islands by Tuesday. The GEFS mean maintains an
inverted surface trough across the Islands through Wednesday
night and possibly into Thursday.

Winds should generally be out of the east most days, with some ENE
component to the flow at times. Deep moisture near the ITCZ should
stay south of the state through the upcoming week, with the
typical trade wind showers expected. However, some heavier
rainfall may get close to the southern portions of the Big Island
Saturday night into Sunday, and this has trended a little more to
the north compared to yesterday.

Hamrick