569 

FXHW01 KWNH 230845

PMDHI 



Hawaii Extended Forecast Discussion

NWS Weather Prediction Center College Park MD

445 AM EDT Sun Aug 23 2026



Valid 00Z Mon 24 Aug 2026 - 00Z Mon 31 Aug 2026



Overall, not much change from the previous forecast as Tropical 

Storm Moke will continue its track west-northwest across the 

central Pacific today and Monday. Winds are expected to become

easterly and strengthen today with surface high pressure north of

the island chain and Moke passing south of the islands. A deep 

plume of moisture positioned north of Moke will fuel heavy 

rainfall, especially over the eastern islands, with multiple  

inches of rainfall likely across portions of the Big Island. With

these rains coming quickly on the heels of Lala, life-threatening

flooding and mudslides are a significant concern. Even as the 

system continues west and weakens, guidance shows an elongated 

stretch of deeper moisture remaining across the islands, 

potentially carrying the threat for heavy rainfall well into early

next week.



Then a return to more typical easterly trades is expected, with 

notably drier air spreading across the islands by midweek.



Bann



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