Flood advisory extended for Oahu as rains spread

May 16—1/2

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Nearly whiteout conditions due to heavy rains are seen on South Beretania Street, this morning. The remaining kona low continues to bring the threat of heavy rains and flooding through Friday.


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Areas of moisture are seen around the islands in this satellite image today.

UPDATE: 10:40 a.m.

Flooding has forced the closure of the right lane of Farrington Highway westbound at Lualualei Naval Road.

10:30 a.m.

Flooding has forced the closure of the westbound lanes of Farrington Highway in Mailiili, according to the state Department of Transportation.

A downed tree and landslide have also forced the closure of the right lane of the Pali Highway Honolulu-bound at the Castle Junction. Police are on scene and a crew is on the way to clear the road.

10:20 a.m.

The Diamond Head State Monument has been closed today due to heavy rain, according to the Department of Land and Natural Resources.

The rain is causing heavy runoff and minor rockslides at the tunnel entrance and along the trail, a department spokesperson said.

9:25 a.m.

Flooding has forced the closure of Kapaa Quarry Road from Mokapu Saddle Road to Mokapu Quarry Road.

8:40 a.m.

The flood advisory for Oahu has been extended to 11:45 a.m. today.

Radar at 8:32 a.m. showed that the area of heavy rainfall has expanded from East Oahu to cover the entire island, the NWS said.

Rain was observed falling at rates of 1 to 2 inches per hour from Manoa to Hawaii Kai, according to the NWS. Ponding was reported on some roads in Kapolei, and a lane of the H-1 freeway was closed between Fort Weaver Road and Makakilo Drive.

7:35 a.m.

A flood advisory has been posted for Oahu through 10:30 a.m. today.

Radar at 7:29 a.m. showed heavy bands of rain over East Oahu falling at rates of 1 to 2 inches per hour over the Maunawili and Waimanalo areas, the NWS said. More rainfall is moving toward Oahu from the south.

Some locations that will experience flooding include Honolulu, Kaneohe, Ahuimanu, Kalihi, Maunawili, Kahaluu, Moanalua, Manoa, Halawa, Aiea, Waiahole, Kailua, Salt Lake, Kaneohe Marine Base, Palolo, Waikane, Waimanalo, Pearl City and Kaaawa.


Residents and visitors are advised to stay away from streams, drainage ditches and low-lying areas prone to flooding.

The advisory may need to be extended if flooding persists.


Although all flood advisories were canceled overnight, most of the state remains under a flood watch as a kona low continues to pull tropical moisture over the islands.

A flood watch remains in effect for Kauai County, Oahu and Maui County through Friday evening.

"Significant flooding may occur due to the overflow of streams and drainages," the National Weather Service said in a bulletin this morning. Roads in several areas may be closed and property damage may occur in urban or low-lying spots due to runoff. Areas with steep terrain may also be at risk for landslides.

As of 3:51 a.m., weather officials said a kona low remains in place about 600 miles north to northwest of the main Hawaiian islands drawing unstable tropical moisture over the islands over the next few days.

Bands of moderate to heavy rain and thunderstorms will dampen most islands through Friday, forecasters said. However, the kona low will begin to drift away from the islands this weekend, easing conditions over the western half of the state.

Tradewinds are expected to Monday along with milder weather for all islands.

Gov. Josh Green signed an emergency proclamation Wednesday evening in response to the kona low weather event.

The emergency proclamation went into effect immediately and allows the adjutant general to activate units of the National Guard to work in coordination with local authorities, emergency management agencies and others to mitigate the impact of the storm.

County and state agencies are directed to provide emergency relief and engage in emergency management functions. The Hawaii Emergency Management Agency is on partial activation.


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