FXHW01 KWNH 120900

PMDHI 



Hawaii Extended Forecast Discussion

NWS Weather Prediction Center College Park MD

400 AM EST Fri Dec 12 2025



Valid 00Z Sat 13 Dec 2025 - 00Z Sat 20 Dec 2025



...Heavy rains for the western Hawaiian Islands Saturday night 

through Wednesday...



A weak front is forecast to stall over Maui late this week and 

dissipate. This could provide convergence for some showers across 

the central islands, while trades stay weak enough to allow for 

land/sea breezes. 



A low pressure system located northwest of the state tracks east 

along 30N starting Friday with the attendant cold front reaching 

the western islands Saturday night then stalling into Monday. 

Broad southerly flow with ample moisture is likely ahead of this 

frontal zone, and heavy rain is likely for Kauai and vicinity. The

front is forecast to lift north into next week in response to 

another wave of low pressure, and then become stationary through 

Wednesday if not longer. There is more uncertainty if the front, 

and thus the enhanced moisture convergence, will stall over or 

just west of the state by mid to late next week. Regardless, 

before then there is continued confidence in a prolonged heavy 

rain event. At least drought relief can be expected over the next 

week for all but the Big Island which looks to stay east of the 

frontal zones. 





Tate



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