April 21, 2026
549174
Flash Flood Watch
Alert:
...FLASH FLOOD WATCH FOR MAUI AND THE BIG ISLAND THURSDAY THROUGH 
SATURDAY... 
 
...FLASH FLOOD WATCH IN EFFECT FROM THURSDAY MORNING THROUGH 
SATURDAY EVENING... 
The National Weather Service in Honolulu has issued a 
 
* Flash Flood Watch for Maui and the Big Island. 
 
* From Thursday morning through Saturday evening 
 
* An unstable airmass will move over the islands during the second 
half of the week bringing an increase in shower activity. While 
showers will be possible over most areas, the most susceptible 
to flooding will be windward areas which have already received 
rain this week. 
 
* The extended period of rain could cause flooding in low spots 
which could make some roadways impassable. Debris in streams and 
gulches may clog bridges and culverts. Strong winds may cause 
tree branches to fall which will add to the amount of possible 
debris.
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. Monitor later forecasts and be prepared to take action if a Flash Flood Warning is issued. If you experience heavy rain or rising water, head to higher ground immediately.
Target Area:
Big Island Interior
Big Island North and East
Haleakala Summit
Kohala
Kona
Leeward Haleakala
Maui Central Valley
Maui Leeward West
Maui Windward West
South Big Island
Windward Haleakala
Forecast Office: NWS Honolulu (Hawaii)

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