A flash flood watch is in effect for Hawaii Island until 6 a.m. Sunday, according to National Weather Service forecasters in Honolulu.
A strong low aloft will combine with a surface trough to bring the threat of heavy rain and thunderstorms to all islands through Saturday night, according to forecasters. The storms are expected to be slow-moving, and while the heavy rains are not expected to be widespread, localized intense rainfall is likely to occur potentially leading to flash flooding in streams and urban areas.
A flash flood watch means that conditions may develop that lead to flash flooding. Flash flooding is very dangerous; it does not have to be raining heavily where you are for flash flooding to occur.