Headline:
Flash Flood Warning issued March 20 at 4:53AM HST until March 20 at 8:00AM HST by NWS Honolulu HI
Event:
Flash Flood Warning
Urgency:
Immediate
Effective:
March 20, 2026 - 7:53am
Expires:
March 20, 2026 - 11:00am
Description:
FFWHFO
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.
Instruction:
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.
Area Description:
Oahu in Honolulu, HI
Forcast Office:
NWS Honolulu HI
Sender:
w-nws.webmaster@noaa.gov