The National Weather Service issued a flash flood watch Monday morning for Oahu and Kauai through 6 p.m. Tuesday.
Forecasters say an upper level low north of the islands will bring unsettled weather. Locally heavy rainfall is possible and the unstable atmosphere could also produce thunderstorms over the watch area.
Rainfall in excess of 3-inches-per-hour could also produce thunderstorms over the watch area and could lead to flash flooding.
A flash flood watch means that conditions may develop that lead to flash flooding.
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