UPDATE: Flash flooding caused by excessive rainfall still possible for Kaua‘i, Ni‘ihau

Update at 4 a.m. Monday, Feb. 23, 2026: A flood watch is extended for all of Kauaʻi and Niʻihau through 6 p.m. today (Monday, Feb. 23).

The National Weather Service expects that an upper level disturbance will create unstable conditions across the state. Flash flooding caused by excessive rainfall remains possible.

A low level trough moving in from the north will combine forces with increasing northeasterly trade winds, producing periods of moderate to heavy showers and thunderstorms across most of the state.

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.

Original post at 10:25 a.m. Sunday, Feb. 22, 2026: Flash flooding because of excessive rainfall once again threatens Kaua‘i and Ni‘ihau beginning early this afternoon, causing National Weather Service forecast office in Honolulu to issue a new flood watch for both islands.

The watch goes into effect at noon today (Feb. 22) and runs through 6 a.m. Monday (Feb. 23).

Slow-moving, heavy showers and isolated thunderstorms are forecast to develop over island interiors this afternoon, posing a threat of possible flash flooding.

The threat shifts to windward and mauka areas of the islands tonight as deep moisture and unstable trade winds build into the area.

Flood-prone roads and other low-lying locations could be closed because of elevated runoff and overflowing streams. Urban areas also might receive more significant flooding and property damage because of rapid runoff.

The public should monitor later forecasts and be prepared if flash flood warnings are issued.