693
FXHW01 KWNH 040709
PMDHI

Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
209 AM EST Thu Dec 4 2025

Valid 00Z Fri 05 Dec 2025 - 00Z Fri 12 Dec 2025

A cold front in association with a deep trough and cutoff low
west of the state later this week should weaken by the weekend.
Heavy rainfall along the front is likely to remain west of the
main islands though wind speeds across the entire island chain,
but especially the western islands, look moderate to gusty
Thursday into Friday. Winds should moderate back to normal
easterly trades by the weekend. A compact cut off low will meander
east of the state this weekend as well, which may lead to some
increased precipitation for eastern parts of the Big Island.
Another cold front may reach the western islands later next week,
bringing another round of increased precipitation, but there is
still quite a bit of uncertainty how far east it will progress.
The GFS is the farthest west with the parent system, keeping the
front well west of the main islands, although the ECMWF and
ensemble means show the front pushing into the western islands.


Santorelli

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