431 

WGHW70 PHFO 201611

FFSHFO



Flash Flood Statement

National Weather Service Honolulu HI

611 AM HST Fri Mar 20 2026



HIC003-201800-

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

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

Honolulu HI-

611 AM HST Fri Mar 20 2026



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



...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 8 AM HST THIS MORNING 

FOR THE ISLAND OF OAHU IN HONOLULU COUNTY...



At 611 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.



For the windward side of Oahu, heavy showers continue to develop and 

move through, with rainfall rates of 1 to 2 inches per hour. Water 

levels in the streams remain high, especially in the Waiahole, 

Waikane, and Kahana streams. Runoff impacting vulnerable low lying 

areas and roads will continue through the morning hours.



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...Severe flooding in drainages, streams, rivers, roads,

         properties, and other low lying areas. Numerous public

         road closures expected, as well as landslides in steep

         terrain. Significant property damage expected to homes

         and other properties in low lying areas.



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.



&&



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