First Alert Forecast: Tracking periods of heavy rain Friday into Saturday

Could some thunderstorms be firing up? A first alert heads up, periods of heavy rain possible for Friday into Saturday as an upper-level disturbance nears the islands.

First Alert Forecast: Tracking periods of heavy rain Friday into Saturday. Could some thunderstorms be firing up? A first alert heads up, periods of heavy rain possible for Friday into Saturday as an upper-level disturbance nears the islands. Breezy trade winds will continue across Hawaii into tonight, keeping the usual pattern of passing showers focused over windward and mauka communities. Conditions will stay fairly typical through this evening, though the atmosphere is becoming more unstable as an upper-level low approaches the islands from the north. Friday is shaping up to be the most active weather day of the week. A cold upper-level disturbance moving directly over Kauai will create enough instability for heavier showers and even isolated thunderstorms, especially over Oahu and parts of Maui County. Forecasters are watching the pos...