


Prognostic Meteorological Discussion
Issued by NWS
Issued by NWS
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958 FXHW01 KWNH 160718 PMDHI Hawaii Extended Forecast Discussion NWS Weather Prediction Center College Park MD 318 AM EDT Thu Oct 16 2025 Valid 00Z Fri 17 Oct 2025 - 00Z Fri 24 Oct 2025 Guidance remains reasonably well clustered for the main flow and features, bolstering overall forecast confidence. Expect trades to steadily ramp-up over the next few days and then again over the weekend as high pressure settles to the northeast and then bridges to the north of the state. Meanwhile, an unsettling upper low/trough settling over the state will be a slow mover over the next couple of days and shifting slowly westward. Pooling moisture and increasing lift favor chances for some local downpours and thunderstorms in a wet period. An overall upper weakness may linger over the islands into next week, with enhanced trades favoring windward terrain activity. Schichtel $$