First Alert Forecast: Lighter trades may lead to isolated afternoon downpours

Light to moderate trade winds will continue to bring some showers for windward areas through the weekend. But there’s a First Alert as those winds will be light enough to allow afternoon sea breezes to blow over sheltered leeward sections. At the same time, an upper level disturbance will increase the chance for pop-up downpours and isolated thunderstorms late tonight into Sunday.

The chance for some rumbles of thunder will begin with Kauai and surrounding waters later in the day, Oahu tonight and the rest of the island chain Sunday. It will be difficult to say exactly where the heaviest rain will fall, but they will favor leeward areas. Basically, if you see dark clouds forming, there’s that higher chance for heavier rain.

Surf will be small Saturday but we are tracking some higher waves for Sunday. A shoft-lived small medium-period northwest swell will boost waves near head-high levels Sunday. A moderate long-period south swell will peak Sunday with the potential for some sets near the 10-foot high surf advisory level. You’ll get the First Alert here as we get more swell data.

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