A flash flood watch has been issued for Hawaii Island effective through 6 a.m. Friday, according to the National Weather Service in Honolulu.
A cold low aloft moving over the eastern portion of the state will support the threat of heavy rain and thunderstorms through Thursday night, forecasters said. While the bulk of the rainfall will occur over the windward slopes, heavy showers are expected over leeward areas Thursday afternoon.
A flash flood watch means that conditions may develop that lead to flash flooding, according to the service, which also noted that it does not have to be raining heavily where you are for flash flooding to occur. Heavy rain on nearby slopes may produce flooding in area streams, canyons and other low-lying areas.