UPDATE: 12:45 a.m.

The flash flood warning for the Big Island has been extended to 4 a.m. Saturday.

Radar this evening showed heavy showers repeatedly forming over the slopes of the Kau and Puna districts, producing nonstop rainfall. Rainfall rates between 1 and 2 inches per hour will continue to lead to significant runoff.

In the Kau district, road closures include Highway 11 at Kawa Flats, Wood Valley Road, and Kaalaiki Road.

Some locations that will experience flash flooding include Hawaii Volcanoes National Park, Wood Valley, Volcano, Pahala, Glenwood, Punaluu Beach, Kawa Flats, Mountain View, Naalehu, Hawaiian Acres, Fern Forest, Eden Roc, Fern Acres, Waiohinu and Kurtistown.

9:50 p.m.

The flash flood warning for the Big Island has been extended to 1 a.m. Saturday.

Radar this evening showed heavy showers repeatedly forming over the slopes of the Kau and Puna districts, with rainfall rates between 1 and 2 inches per hour leading to significant runoff.

In the Kau district, road closures include Highway 11 at Kawa Flats, Wood Valley Road, and Kaalaiki Road.

Some locations that will experience flash flooding include Hawaii Volcanoes National Park, Wood Valley, Volcano, Pahala, Glenwood, Punaluu Beach, Kawa Flats, Mountain View, Naalehu, Hawaiian Acres, Fern Forest, Eden Roc, Fern Acres, Waiohinu and Kurtistown.

7:20 p.m.

The flash flood warning for Hawaii County has been extended to 10 p.m., with National Weather Service forecasters saying that rain continues to fall on parts of the Big Island at rates of up to 2 inches per hour.

“At 6:39 p.m., radar showed persistent heavy showers forming over the southeast slopes of Mauna Loa, with rainfall rates between 1 and 2 inches per hour,” the warning said. “In the Kau district, road closures include Highway 11 at Kawa Flats, Wood Valley Road, and Kaalaiki Road.”

Locations covered by the warning which may experience flash flooding include Hawaii Volcanoes National Park, Wood Valley, Volcano, Pahala, Glenwood, Punaluu Beach, Kawa Flats, Mountain View, Naalehu, Hawaiian Acres, Fern Forest, Eden Roc, Fern Acres, Waiohinu, and Kurtistown.

A flood watch covering all Hawaiian islands remains in effect until Saturday afternoon.

4:10 p.m.

The flash flood warning for Hawaii County has been extended to 7 p.m., as heavy rain continues to fall especially on the southeast side of the Big Island.

“At 3:44 p.m., radar showed rainfall moving over the Kau District from the southeast,” the warning says. “The highest rates were 1 to 2 inches per hour from Hawaii Volcanoes National Park to just east of Naalehu. Water levels in streams and gulches in the area were still running high but were slowly dropping. Highway 11 at Kawa Flats, Wood Valley Road, and Kaalaiki Road remain closed.”

The warning includes Hawaii Volcanoes National Park, Volcano, Glenwood, Mountain View, Hawaiian Acres, Wood Valley, Orchidland Estates, Pahala, Punaluu Beach, Kawa Flats, Naalehu, Fern Forest and Eden Roc.

1:30 p.m.

The National Weather Service has issued a new flood advisory for the island of Maui, in effect until 4:30 p.m. today.

Officials issued the advisory after canceling an earlier one around noon today.

At 1:18 p.m., radar showed that heavy rains redeveloped over east Maui. The highest rates were 1 to 2 inches per hour along a line from Kipahulu to Nahiku. Additional rainfall may move over east Maui from the southeast over the next several hours.

Some locations that will experience flooding include Kipahulu, Nahiku, Kaupo, Keanae, Hana, Kula, Huelo, Haiku-Pauwela, Haleakala National Park, Wailua, Kailua and Hamoa.

Officials warn the public to stay away from streams, drainage ditches and low-lying areas prone to flooding.

A flood watch for Maui County and all Hawaii islands is also in effect through Saturday afternoon.

12:45 p.m.

The National Weather Service has extended the flash flood warning for the island of Hawaii until 4 p.m.

At 12:47 p.m., radar showed heavy rainfall continuing over the Kau District with recent rates reaching 1 to 2 inches per hour.

Hawaii County Civil Defense reported that Highway 11 at Kawa Flats, Wood Valley Road, and Kaalaiki Road remain closed. Rainfall over the South Hilo and Puna Districts have eased, but runoff levels remain high.

Additional rainfall will continue to move over the southeast half of Hawaii island through tonight.

Officials warn the public not to cross fast flowing water by vehicle or by foot.

A brown water advisory, meanwhile, has been issued by the state Health Department for the island of Hawaii. Heavy rain has resulted in stormwater runoff entering coastal waters, and the public is advised to stay out of flood waters.

12:15 p.m.

The flood advisory for the island of Maui has been canceled, according to an alert from the National Weather Service as of 12:10 p.m. today.

NWS said radar shows the heavy rain has diminished.

However, due to the saturated ground, any new areas of heavy rainfall that develop may quickly result in flooding.

A flood watch remains in effect until 6 p.m. Saturday for Kahoolawe, Kauai, Lanai, Maui, Molokai, Niihau, Oahu and Hawaii island.

Maui County officials at 12:07 p.m. issued a notice that Piilani Highway from Kipahulu to Ulupalakua is closed due to inclement weather. Signs are posted at both ends indicating closure.

Additionally, officials said Ulupalakua to Hana Town is open to local traffic only. Signs are posted at Ulupalakua and Twin Falls.

10:45 a.m.

The flash flood warning for Hawaii island has been extended to 1 p.m.

Radar data at 10:30 a.m. showed heavy rain over the South Hilo, Puna, and Kau Districts, while stream gauges showed water levels were continuing to rise.

Multiple roads are closed due to the inclement weather, including Highway 11 at Kawa Flats, Wood Valley Road, Pohaku Drive, and East Kawailani Street.

The Hawaii Red Cross has opened two shelters on Hawaii island – one at Naalehu Gym at 95-5635 Mamalahoa Highway and one at Kau District Gym at 96-1219 Kamana St. in Pahala.

While no homes are affected at this time, the Red Cross said the shelters are being offered for travelers who cannot continue due to road closures.

Hawaiian Electric said crews are responding to more 2,035 customers without power from the Milolii to the South Point area.

An earlier flood advisory for the island of Maui has also been extended through 1 p.m. today.

Radar at 9:37 a.m. showed moderate to heavy rain over East Maui at rates up to 1 to 2 inches per hour along the upper slopes of Haleakala from Kipahulu to just west of Kaupo Gap, the NWS said. More rainfall is expected across East Maui over the next several hours.

Some locations that will experience flooding include Kipahulu, Kaupo, Nahiku, Keanae, Kula, Hana, Keokea, Huelo, Haleakala National Park, Wailua, Kailua and Hamoa.

A high surf advisory also remains in effect for the east-facing shores of Kauai, Oahu, Molokai, Maui, and Hawaii island through 6 p.m. Saturday.

“Strong to near-gale force east-southeast winds will keep large and rough surf in place along east facing shores during the next couple days,” said NWS.

Surf of 6 to 10 feet today is expected to build to 7 to 11 feet tonight and Saturday.

Officials warn of strong, breaking waves and currents, which will make swimming dangerous.

9:25 a.m.

A flash flood warning has been posted for Hawaii island through 12:15 p.m. today.

Heavy rainfall has been observed from the Kau district from Hawaii Volcanoes National Park to Naalehu with rates up to 1 to 2 inches per hour, the NWS said in a bulletin.

Low-water crossings along Wood Valley Road are expected to be impassable, weather officials said.

The earlier flood advisory for Hawaii island has also been extended through 12:15 p.m.

Some locations that will experience flooding include Hilo, Hawaiian Paradise Park, Hawaii Volcanoes National Park, Volcano, Glenwood, Mountain View, Hawaiian Acres, Wood Valley, Orchidland Estates, Pahala, Keaau, Pahoa, Punaluu Beach, Kawa Flats, Papaikou, Pepeekeo, Naalehu, Fern Forest and Eden Roc.

8:55 a.m.

All lanes of Hawaii Belt Road on Hawaii island have been reopened following an earlier landslide.

However, both lanes of Highway 11 between mile markers 59.5 and 60 have been closed due to ponding.

8:10 a.m.

Hawaii island motorists are advised to expect delays on Hawaii Belt Road near the Honomu Road junction as the Hilo-bound lane has been closed due to a landslide.

7:55 a.m.

An anticipated road closure due to flooding has prompted the cancellation of classes for Ka‘u High & Pahala Elementary and Na‘alehu Elementary.

The two campuses will be closed and the school communities will be alerted, the state Department of Education said in a statement today.

7:30 a.m.

The earlier flood advisory for Oahu has been canceled. However, a flood advisory has been posted for the island of Maui through 10 a.m.

Radar at 6:54 a.m. showed moderate to heavy rain over the east half of Haleakala at rates up to 1 inch per hour, according to the National Weather Service. More rainfall is expected across East Maui over the next few hours.

Some locations that will experience flooding include Kipahulu, Kaupo, Nahiku, Keanae, Kula, Hana, Keokea, Huelo, Haleakala National Park, Wailua, Kailua and Hamoa.

PREVIOUS COVERAGE

Flood advisories have been extended for Oahu and Hawaii island as a flood watch remains in effect for all Hawaiian islands through Saturday afternoon.

Radar at 6 a.m. showed moderate to locally heavy rain over the Kau and Puna districts with rates up to 1 inch per hour, according to the National Weather Service.

The flood advisory is in effect for Hawaii island through 9:15 a.m.

Radar at 4:34 a.m. showed moderate to heavy rain over Windward Oahu falling at a rate of 1 to 2 inches per hour, according to the NWS. Koolau-fed stream water levels are also rising. More rain is also approaching from the south and is likely to affect leeward and urban areas through the morning commute.

Forecasters say periods of heavy rain and thunder will be possible through the weekend, and that this weather pattern may continue into next week.