Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
256 AM EDT Tue Oct 21 2025

Valid 00Z Wed 22 Oct 2025 - 00Z Wed 29 Oct 2025

The main subtropical high will be centered well to the north of
Hawaii through the middle of this week. By Friday into next 
weekend, the ensemble means are indicating the surface high 
rebuilds closer to the Islands near 30 degrees north, and this 
high slowly works its way to a position northeast of the state by 
next Monday, with a col developing in the ridge axis.

A weak upper level trough nearby will help sustain a modest
inverted trough near and just south of the state through Thursday,
but it does not appear to be strong enough to advect deeper 
moisture from the ITCZ northward. Therefore, the typical trade 
wind enhanced showers can be expected on most days with no major 
rain events expected over the coming week.

Hamrick