Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
329 AM EDT Mon Apr 21 2025

Valid 00Z Tue 22 Apr 2025 - 00Z Tue 29 Apr 2025

...Wet pattern again on tap this week...

Island trades have increased as surface high pressure cells 
bridge to the north of the state. This favors a generally wet 
trade pattern given lingering moisture for early this week, with 
more focus on windward terrain. Guidance generally agrees that
upper trough/closed low and surface system genesis remains set to
dig and settle just to the west of the state by mid-later week. 
Weakening and veering lead flow to southeasterly to southerly 
winds over the state should deepen lead moisture to fuel showers 
and some heavier local downpours. The upper system should slowly 
eject and lose influence into the weekend, but a moisture pooling
trailing front and showers focus may work slowly into the state.

Schichtel