Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
359 AM EDT Mon Apr 14 2025

Valid 00Z Tue 15 Apr 2025 - 00Z Tue 22 Apr 2025

Moderate to breezy easterly trades over Hawaii should continue 
Monday and slowly weaken on Tuesday. A weak low aloft could allow 
for a bit of instability for a showery pattern, with the showers 
favoring windward and mauka areas.

A large trough aloft will approach west of the state into 
midweek. Mean winds should veer more southerly in response to the 
trough, but are likely to be weak enough at the surface that land 
and sea breezes dominate the pattern. The upper trough will push a
surface cold front that stalls west of the state for the latter 
half of the week. Ahead of the front, moisture will be drawn 
northward atop the islands and increase shower coverage. 
Precipitable water values could reach over the 90th percentile for
this time of year at times. The wetter pattern is forecast to 
begin in the western islands Wednesday and peak across the state 
Thursday-Friday. Over the weekend, trades may start to return, but
a hybrid land/sea breeze and trade pattern may continue until
early next week while some moisture lingers.


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