Moderate trades will strengthen to breezy levels Wednesday and hold through the forecast period. Moisture will continue to fill in across the state from east to west tonight into Friday increasing chances of showers mainly for windward and mauka areas. Chances of heavy rain, isolated thunderstorms and flood potential will increase Thursday into Friday as an upper level disturbance moves overhead. Drier air will move back in this weekend as trades continue. Moisture from the remnants of Tropical Depression 15-E may bring another round of enhanced trade showers early next week.
Moderate to locally breezy trade winds tonight will push clouds and showers over mostly windward and mountain areas. A bit more moisture is present over the western half of the state, so lower ceilings and showers will be present there tonight. By tomorrow, trade winds strengthen to breezy levels in the afternoon and a trough approaches the area from the east. Showers and low clouds associated with that trough will increase with the trade wind flow from east to west starting tomorrow evening for the eastern half of the state.
AIRMET Sierra is in effect over Oahu and Molokai due to mtn obscuration from the passing showers. This AIRMET will likely be expanded to include Kauai later tonight. There is also the possibility for AIRMET Tango tomorrow afternoon once trade winds strengthen.
Issued at 344 PM HST Tue Sep 15 2026
Prominent low pressure south of the islands maintains fresh trades from tomorrow onward. A Small Craft Advisory will be needed for Wednesday and potentially beyond. Remnants of TC Norbert will bring isolated thunderstorms to area waters Thursday night through Friday night.
Long period energy out of the S to SW fills in during the latter half of the week supporting building surf for S shores. Surf is initially small through Wednesday but will trend upward toward the High Surf Advisory threshold by this weekend. Surf along E shores will modestly increase in response to building trades and a brief medium period E swell emanating from former TC Norbert. N shores stay flat to tiny.
None.
