Courtesy of the National Weather Service, heavy rain fell over the Koolau Mountains this morning.

Courtesy of the National Weather Service, heavy rain fell over the Koolau Mountains this morning.

According to the National Weather Service in Honolulu, Oahu is under a flood warning this morning as heavy rain hits the east and windward sides of the island.

The advisory, which lasts until 7 a.m., includes Kaneohe, Ahuimanu, Kalihi, Maunawili, Manoa, Moanalua, Kahaluu, Halawa, Kailua, Aiea, Palolo, Waiahole, Waimanalo, Waikane, Pearl City, Hawaii Kai, Heeia, Nuuanu and Fort Shafter and Makiki Tantalus.

“At 3:54 a.m. radar indicated heavy rain over the Koolaus. “Rain was falling at a rate of up to 5 cm per hour,” the warning said.

Forecaster said the Hawaiian Islands will see periods of moderate to locally heavy rain today and tomorrow, spreading northwest across the state, with isolated thunderstorms possible over the eastern end of the state.

Light to moderate trade winds are expected through this evening, followed by “breezy winds with slightly drier conditions” next week, it said today.

In addition to the flood warning, a high surf warning is in effect for all east coasts until 6pm today. The weather service forecasts large breaking waves of up to 8 to 12 feet this morning, falling to 7 to 10 feet in the afternoon.

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Meanwhile, Hurricane Kristy is “rapidly weakening” in the eastern Pacific and is expected to weaken into a post-tropical remnant low by Sunday before reaching the central Pacific, according to the National Hurricane Center in Miami.

Kristy, a major hurricane earlier this week far from land in the eastern Pacific, had maximum sustained winds of about 75 mph (120 km/h) with stronger gusts as of this morning, forecasters said.

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