HONOLULU (KHON2) — The National Weather Service (NWS) has extended the flash flood warning for Oahu until 1:15 a.m. Monday as a strong thunderstorm makes its way toward Honolulu County.

In a 9:48 p.m. update, the National Weather service says the Oahu Department of Emergency Management reported an ongoing significant flash flooding.

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The Hawaii Department of Transportation reported that two right westbound lanes on the H-1 Freeway were closed near Middle Street. Traffic is being diverted to H-201. One lane is also closed on Kalanianaole Highway at the Halona Blowhole Lookout due to rocks in the mauka lane. Drive with caution.

Wind gusts up to 50 – 55 mph are forecast and could knock down tree limbs and blow around unsecured objects.

Rush of water is seen on South Kihei Road at Kaonoulu intersection. Courtesy Elena Pray.

Improving weather conditions will start over the eastern end of the state by late tonight with much drier condition expected over Maui County and the Big Island on Tuesday.

Condition will remain moist and unstable over Oahu and Kauai through Tuesday.

More typical trade wind weather will return from late Wednesday onward.