Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
255 AM EST Thu Dec 26 2024

Valid 00Z Fri Dec 27 2024 - 00Z Fri Jan 03 2025

Over the next couple days, generally southeasterly flow will be
present across the state (with some sea/land breezes perhaps
arising over the islands) as a surface high is located to the
east. Aloft, a subtropical ridge should limit too many showers. By
late Friday or Saturday, the upper ridge axis is likely to break
over Hawaii in response to a trough that eventually produces an
upper low setting up southeast of the state early next week.
Meanwhile a front is forecast to push into Kauai and perhaps to
Oahu, providing a focus for moderate to possibly heavy rain
showers this weekend as it stalls. Behind the front, a surface
high will set up north of the state and allow for trade winds to
resume early next week. Moisture remaining in place will help
produce showers, which should favor windward/mauka areas due to
the wind pattern. The eastern side of the Big Island on
Monday-Tuesday may see the heaviest rain given the proximity to
the upper low to the east. Some showers and easterly trades are
likely to continue into midweek.

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