641
FXHW01 KWNH 040811
PMDHI

Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
410 AM EDT Fri Jul 04 2025

Valid 00Z Sat Jul 05 2025 - 00Z Sat Jul 12 2025

Surface high pressure positioned north of the islands will help
maintain breezy to windy trades over the next several days. A
weakening frontal boundary will push slowly south and allow for
rainfall to focus over the Big Island before shifting farther
south and dissipating by Tuesday. The trades will focus the
majority of the rainfall to the eastern slops of the Big Island
however some rain my spread to the leeward areas. Late this week
into the weekend, the surface high is forecast to drift
southeastward, and meanwhile an upper trough pushing a cold front
will approach west of the state. This should permit winds to
gradually weaken to moderate level while veering some and
reorienting best rain chances on the southeastern sides of the
islands. Model guidance shows moisture levels increasing by early
next week ahead of the front, so will continue to monitor for
possible increases in rain amounts by that time.

Campbell

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