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COURTESY NWS
Radar shows rain over Oahu and Kauai tonight.
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COURTESY NWS
A map shows the areas, in green, covered by a flood watch from this evening through Thursday afternoon.
UPDATE: 11:55 p.m.
The flood advisory for Oahu has expired, but the advisory for Kauai and Niihau remains in effect until 12:45 a.m.
9:20 p.m.
Kauai, Niihau and the eastern side of Oahu are under a flood advisory tonight as the first storm of the rainy season brings showers to the western side of the state.
The National Weather Service says the advisory for Oahu is in effect until 11:45 p.m.
“At 8:51 p.m., Doppler radar indicated moderate to locally heavy rain over the eastern half of Oahu,” the advisory says. “Rain was falling at a rate of up to 1.5 inches per hour with the heaviest rain around Manoa and Olomana. Minor flooding is ongoing or expected to begin shortly in the advisory area.’
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The Oahu advisory covers Honolulu, Manoa, Maunawili, Palolo, Waimanalo, Kaneohe, Kailua, Kalihi, Hawaii Kai, Moanalua, Ahuimanu and Kaneohe Marine Base.
NWS forecasters said the advisory for Kauai County is in effect until 12:45 a.m.
“At 9:15 p.m., Doppler radar indicated bands of moderate to locally heavy rain over Kauai,” the advisory says. “The heaviest rainfall has been occurring over south and west Kauai with rates of 0.5 to 1 inch per hour. …Additional bands of heavy rain will be possible over the next several hours.”
Locations under the advisory include Lihue, Kapaa, Kalaheo, Kekaha, Lawai, Omao, Kokee State Park and Poipu.
Kauai County and Honolulu are also under a flood watch through Thursday afternoon.
PREVIOUS COVERAGE
A flood watch is in effect for Kauai County and Oahu from this evening through Thursday afternoon, the National Weather Service said early this morning, warning that flash flooding caused by excessive rainfall is possible.
Forecasters said a developing area of low pressure north of the Hawaiian Islands will draw deep tropical moisture northward, bringing a threat of heavy rain over Kauai and Oahu tonight through Thursday.
Heavy showers and isolated thunderstorms are expected to develop tonight and continue through Thursday as that moisture moves over the state, weather officials said. Forecasters said heavy showers could train, or repeatedly move over the same areas, producing intense rain rates.
“Flood-prone roads and other low-lying areas may close due to elevated runoff and overflowing streams,” according to the NWS. “Urban areas may receive more significant flooding and property damage due to rapid runoff.”
Weather officials urged residents and visitors to monitor later forecasts and be prepared to take action should flash flood warnings be issued.