April 20, 2026

FLASH FLOOD WATCH ALL HAWAIIAN ISLANDS

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Flash Flood Watch
Alert:
...FLASH FLOOD WATCH FOR ALL HAWAIIAN ISLANDS BEGINNING SUNDAY 
MORNING... 
 
...FLASH FLOOD WATCH REMAINS IN EFFECT FROM SUNDAY MORNING THROUGH 
LATE MONDAY NIGHT... 
The Flash Flood Watch continues for 
 
* Molokai, Kauai, Maui, Lanai, Niihau, the Big Island, Oahu and 
Kahoolawe. 
 
* From Sunday morning through late Monday night. 
 
* Heavy rain capable of producing flash flooding will develop over 
the area Sunday through Monday night. The threat for heavy rain 
will first materialize over Maui County and the Big Island on 
Sunday, and then spread westward over the remainder of the area 
late Sunday night through Monday night. 
 
* 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.
Instructions: A Flash Flood Watch means that conditions are favorable for flash flooding. Flash Flooding is LIFE THREATENING. Do not cross fast flowing water in your vehicle or on foot.
Target Area:
Big Island East
Big Island Interior
Big Island North
Big Island South
Big Island Southeast
Big Island Summit
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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