HONOLULU (HawaiiNewsNow) - A Flash Flood Watch for Kauai, Niihau and Oahu will be expanded to include the islands of Maui County Sunday evening as a broad disturbance and cold front move down the island chain.
The National Weather Service in Honolulu said the watch will take effect at 6 p.m. Sunday for Molokai, Lanai, Maui and Kahoolawe.
The watch for all the islands, except the Big Island, is in effect until 6 p.m. Monday.
A moist and unstable airmass will bring bands over heavy showers and thunderstorms over Kauai County and Oahu Sunday and Maui County Sunday night. Some of the bands will have the potential to produce torrential rainfall in a short amount of time.
Flash flooding will be possible in areas with poor drainage, in streams and in low-lying areas.
A Flash Flood Watch means that conditions will be present that could lead to flash flooding. Monitor later forecasts and the Hawaii News Now weather and news apps and be prepared to take action if a Flash Flood Warning is issued.