HONOLULU, Hawaii (HawaiiNewsNow) - A large cold front has stalled out over Maui and the Big Island and will continue to produce widespread rain across the eastern islands through Tuesday. This unstable cloud band begins to drift westward on Tuesday with shower trends increasing over the western islands of Oahu and Kauai through Tuesday night. Strong north to northeasterly winds will begin to ease over the eastern islands by early Tuesday morning, becoming moderate to breezy trade winds for Maui and Hawaii Counties. Windy and wet weather conditions will continue over Oahu and Kauai through Tuesday afternoon. Improving weather trends are forecast from Wednesday through the end of the week with moderate to breezy easterly trade winds with periods of showers favoring windward and mountain areas. Trade winds are expected to strengthen through the weekend with more scattered shower activity.
A large north-northwest swell combined with the locally generated wind waves is producing very large and disorganized surf along north and west facing shores of the islands. As a result, a High Surf Warning remains in effect through early Tuesday morning for most north and west facing shores of the smaller islands. There is also a High Surf Advisory (HSA) in effect for north and west facing shores of the Big Island. The forecast guidance shows the swell direction will become more northerly on Tuesday. Therefore, we expect an HSA will be needed for the north and west facing shores of the islands Tuesday and Tuesday night. Surf heights will gradually lower late Tuesday night and Wednesday, so expect the HSA to eventually be cancelled by early Wednesday.