April 20, 2026

Flood Watch Issued by NWS…..Flood Advisory for Oahu

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Flood Watch
Alert:
...FLOOD WATCH FOR ALL HAWAIIAN ISLANDS THROUGH TUESDAY AFTERNOON... 
 
* WHAT...Flash flooding caused by excessive rainfall is possible. 
 
* WHERE...All Hawaiian islands. 
 
* WHEN...Through Tuesday afternoon. 
 
* 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 cold front near Kauai this morning will continue to move 
eastward spreading heavy showers and thunderstorms down the 
island chain through Tuesday. Convective heavy shower bands 
may persist over some islands, especially along the frontal 
cloud band, increasing the threat for flash flooding 
statewide.
Instructions: You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.
Target Area:
Big Island East
Big Island Interior
Big Island North
Big Island South
Big Island Southeast
Central Oahu
East Honolulu
Ewa Plain
Haleakala Summit
Honolulu Metro
Kahoolawe
Kauai East
Kauai Mountains
Kauai North
Kauai South
Kauai Southwest
Kipahulu
Kohala
Kona
Koolau Leeward
Koolau Windward
Lanai Leeward
Lanai Mauka
Lanai South
Lanai Windward
Maui Central Valley North
Maui Central Valley South
Maui Leeward West
Maui Windward West
Molokai Leeward South
Molokai North
Molokai Southeast
Molokai West
Molokai Windward
Niihau
Oahu North Shore
Olomana
South Haleakala
South Maui, Upcountry
Waianae Coast
Waianae Mountains
Windward Haleakala

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