902 

WGHW50 PHFO 201453

FFWHFO

HIC003-201800-

/O.EXT.PHFO.FF.W.0017.000000T0000Z-260320T1800Z/

/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/



BULLETIN - EAS ACTIVATION REQUESTED

Flash Flood Warning

National Weather Service Honolulu HI

453 AM HST Fri Mar 20 2026



...FLASH FLOOD EMERGENCY FOR NORTHERN OAHU...



The National Weather Service in Honolulu has extended the



* Flash Flood Warning for...

  The island of Oahu in Honolulu County



* Until 800 AM HST.



* At 453 AM HST, emergency management reported life-threatening 

  flash flooding across northern Oahu, particularly in the Haleiwa 

  and Waialua areas. Floodwaters have cut off road access in and out 

  of Haleiwa, and widespread flooding of roadways and low-lying 

  areas is ongoing. Although rainfall rates have temporarily 

  decreased, significant runoff continues to produce high water 

  levels and dangerous flooding impacts.



Additional bands of heavy rainfall moving in from the southwest will 

continue over the area, which could lead to renewed rises in water 

levels and worsening flooding conditions.



The Wahiawa Reservoir (Lake Wilson) and Helemano 6 Reservoir remain 

elevated, with water levels still high despite beginning to level 

off. Additional rises in these reservoirs could further exacerbate 

downstream flooding along the streams, particularly near Otake Camp 

in Waialua.



  This is a FLASH FLOOD EMERGENCY for Northern Oahu. This is a 

  PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER GROUND NOW!



  HAZARD...Heavy rain producing life threatening flash flooding.



  SOURCE...Emergency management.



  IMPACT...Flooding in drainages, streams, rivers, roads,

           properties, and other low-lying areas. Public road

           closures possible in some areas. Landslides are

           possible in steep terrain.



* Some locations that will experience flash flooding include...

  northern half of Oahu, along and north of a line from Waianae 

  Valley to Mililani Mauka to Waiahole.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Move to higher ground now! This is an extremely dangerous and 

life-threatening situation. Do not attempt to travel unless you are 

fleeing an area subject to flooding or under an evacuation order.



Stay away from streams, rivers, drainage ditches, and culverts, even 

if they are currently dry.



Be especially cautious at night when it is harder to recognize the 

dangers of flooding.



The heavy rains may cause rock and mudslides in steep terrain areas.



&&



This warning may need to be extended beyond 800 AM HST if flooding 

persists.



LAT...LON 2148 15824 2153 15825 2157 15829 2158 15829

      2159 15828 2160 15813 2169 15805 2173 15798

      2155 15783 2150 15783 2140 15818



FLASH FLOOD...OBSERVED

FLASH FLOOD DAMAGE THREAT...CATASTROPHIC



$$



GIBBS