Headline:
Flood Watch issued September 16 at 3:41PM HST until September 18 at 6:00AM HST by NWS Honolulu HI
Event:
Flood Watch
Urgency:
Future
Effective:
September 16, 2026 - 6:41pm
Expires:
September 17, 2026 - 9:00am
Description:
Remnant moisture from former Tropical Storm Norbert will bring
periods of moderate to heavy showers to the Hawaiian Islands tonight
through Friday morning.
* WHAT...Flash flooding caused by excessive rainfall is possible.
* WHERE...Kauai, Niihau, Maui, Lanai, Molokai, The Big Island and
Kahoolawe.
* WHEN...Through early Friday morning.
* IMPACTS...Flood prone roads and other low lying areas may be closed
due to elevated runoff and overflowing streams. Urban areas may
receive more significant flooding and property damage due to rapid
runoff.
* ADDITIONAL DETAILS...
- A band of remnant moisture from Norbert will move east across the
islands tonight into Friday, bringing moderate to locally heavy
showers. There is a slight chance of thunderstorms on Thursday as
well, which could produce briefly higher rain rates, increasing
the risk of flash flooding.
Instruction:
You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.
Area Description:
Niihau; Kauai Southwest; Kauai Mountains; Waianae Coast; Oahu North Shore; Olomana; Central Oahu; Waianae Mountains; Lanai Mauka; Kahoolawe; Maui Windward West; Maui Leeward West; Haleakala Summit; Kona; Kohala; Big Island Interior; Big Island Summit; Kauai North; Kauai East; Kauai South; East Honolulu; Honolulu Metro; Ewa Plain; Koolau Windward; Koolau Leeward; Molokai Windward; Molokai Southeast; Molokai North; Molokai West; Molokai Leeward South; Lanai Windward; Lanai Leeward; Lanai South; Maui Central Valley North; Maui Central Valley South; Windward Haleakala; Kipahulu; South Maui/Upcountry; South Haleakala; Big Island South; Big Island Southeast; Big Island East; Big Island North
Forcast Office:
NWS Honolulu HI
Sender:
w-nws.webmaster@noaa.gov