Update 5:58 p.m.

The flash flood warning for Kauai has been canceled by the National Weather Service, but the state remains under a flash flood watch through Sunday afternoon. Warnings for Oahu and the Big Island were dropped earlier this afternoon.

A winter storm warning for Big Island summits extends until 6 p.m. Saturday with National Weather Service forecasters predicting up to a foot of snow. A winter storm watch also has been issued for the summits for Sunday when a second foot of snow could fall, forecasters said

Update 5 p.m.

A flash flood warning for the Big Island has been canceled but remains for Kauai until 6 p.m., according to the National Weather Service.

A flash flood watch continues for all islands through Sunday afternoon. “The combination of deep tropical moisture and an unstable airmass will result in potential for heavy showers and thunderstorms across the state through the weekend,” forecasters said. “Rainfall rates from heavier downpours and thunderstorms could cause streams to quickly overflow their banks, leading to flash flooding.”

Update 3:45 p.m.

A flash flood warning for Oahu has been canceled but extended for Kauai and the Big Island this afternoon.

The warning for the Big Island remains in effect until 5:15 p.m. and includes Hilo, Kailua-Kona, Hawaiian Paradise Park, Captain Cook, Honaunau, Keaau, Pohakuloa training area, Naalehu, Pohakuloa Camp, Hawaiian Ocean View, Pahoa and Pepeekeo.

The warning for Kauai is in effect until 6 p.m. and includes Princeville, Kilauea, Haena, Wainiha, Na Pali State Park, Hanalei, Kokee State Park and Kalihiwai. The Hanalei Bridge remains closed because of Hanalei River flooding. Rainfall and runoff is expected to diminish over the next several hours, National Weather Service forecasters said.

Update 12:32 p.m.

The National Weather Service has issued a flash flood warning for Oahu until 3:30 p.m.

Heavy rain was falling on the slopes of the Koolau mountains, with Kahana Valley and Hauula getting up to 4 inches an hour, forecasters said, adding that the rain could persist for hours.

The warning includes but is not limited to Hauula, Kahuku, Waikane, Laie, Waiahole, Kahaluu, Kaaawa, Haleiwa, Punaluu, Ahuimanu, Waialua, and Wahiawa.

Update 11:58 a.m.

The National Weather Service extended a flash flood warning for Hawaii island until 2:15 p.m.

Radar showed heavy rain falling at a rate of 2 to 3 inches per hour on already saturated ground, forecasters said.

Heavy rain is falling across the districts of North and South Hilo, Puna and Kau. Hawaii County officials report multiple landslides and lane closures along the Hamakua coast; highway 11 is closed in both directions near Kawa Flats in Kau near mile markers 58 to 59; and Hilo Bayfront Highway is also closed in both directions between Waianuenue Avenue and Wailoa Bridge.

Update 11:13 a.m.

A flood advisory has been issued for Oahu until 2 p.m. The National Weather Service said heavy rain “has redeveloped over the east-facing slopes of the Koolau range,” with rain rates of about 1 to 2 inches an hour were over Waiahole, Punaluu and Hauula.

More rain was expected over the Koolau mountains over the next few hours, forecasters said. The advisory covers Maunawili, Kailua, Waikane, Mililani, Waialua, Wahiawa, Kalihi, Aiea, Pearl City, Hauula, Kahuku, Laie and Kaneohe.

Update 10:40 a.m.

Kuhio Highway has been closed near the Hanalei Bridge, as the rain-swollen Hanalei River rises. Kauai remains under a flash flood warning through at least noon today.

The American Red Cross has opened Hanalei Elementary School as an emergency shelter, Kauai County officials said. Anyone who plans to shelter at Hanalei School should bring food, water, medicine and any other items they may need while away from home, officials said.

The warning for Kauai could be extended if the rain persists, they said.

Update: 10:25 a.m.

Flash flooding has closed Highway 11 at Kawa Flats near mile markers 58 and 59 and flooding is also reported in Naalehu and Waiohinu as a flash flood warning remains in effect for Hawaii island.

A rain gauge in Pahala is reported rain rates up t o 2 inches an hour.

Meanwhile, rains eased on Oahu and a flood advisory for Oahu has been dropped.

A flash flood watch remains in effect for the entire state as the heavy rains over the Big Island are expected to move north and west over other islands.

Previous Coverage

The National Weather Service issued flash flood warnings for Hawaii island and Kauai and a flood advisory for Oahu as heavy rain, falling at a rates of 3 to 4 inches in some spots, fell over the islands this morning.

The flood advisory for Oahu is in effect until 10:15 a.m. because of rain, falling at rates of as much as 3 to 4 inches per hour from Waikane to Punaluu. Rains were also falling over most of the windward Koolaus from Kailua to Kahuku.

“This rain has the potential to last for several hours,” forecasters said.

The advisory includes Maunawili, Waimanalo, Kailua, Waikane, Waialua, Wahiawa, Punaluu, Hauula, Kaneohe, Waiahole and Kahaluu.

The flash flood warning for Kauai lasts until noon, with “heavy showers developing over interior Kauai and spreading to the north shore. These showers were nearly stationary,” forecasters said. They said Hanalei River was rising rapidly this morning and likely will flood, which could lead to the closing of Kuhio Highway.

The Kauai warning includes Lihue, Kapaa, Princeville, Kilauea, Wailua Homesteads, Na Pali State Park, Moloaa, Anahola, Kokee State Park, Hanalei, Haena and Wainiha, the weather service said.

The warning for Hawaii island is in effect until 11:15 a.m. as rain gauges indicated rain rates of 3 to 4 inches an hour across Hilo and in the Puna and Kau districts. “Flash flooding is expected to begin shortly,” the weather service said.

The Big Island warning includes Hilo, Hawaiian Paradise Park, Keaau, Naalehu, Pahoa, Pepeekeo, Pahala, Glenwood, Kawa Flats, Mountain View, Hawaiian Acres and Hawaiian Ocean View.

In addition, a winter storm warning remains in effect for Mauna Kea and Mauna Loa and a flash flood watch is in effect for the entire state through Sunday afternoon.

The wintry weather that may drop nearly 3 feet of snow on Big Island summits likely means a wet weekend and, perhaps, a humid and wet Dec. 7.

“Be prepared for any kind of rain throughout the weekend,” said Matt Foster, a meteorologist with the National Weather Service Honolulu office.”It should be fairly unsettled weather through the weekend. … We may have a brief return to some stabilization (early next week), but not a whole lot changes into the middle of next week.”

Forecasters said 20 to 30 inches of snow could fall today on Big Island summits above 11,000 feet on top of the snow that has already fallen on Thursday. The roads to the tops of Mauna Kea and Mauna Loa remained closed because of the winter weather conditions.

The statewide forecast calls for mostly cloudy skies today with a slight chance of thunderstorms. Showers are likely in the afternoon and locally heavy rain is possible. Highs are expected to be between 79 and 84 degrees, with lows tonight between 65 to 70 degrees.

Winds are shifting from easterly tradewinds to southerly Kona winds.

The Kona winds will bring an increase in humidity and vog, unless rains wash the volcanic haze away. There’s also an increased chance of showers over leeward slopes because of daytime heating.

The Kona weather conditions will continue through Wednesday.

That will likely mean humid weather with the chance of rain for Dec. 7th ceremonies at Pearl Harbor. The chance of rain increases in the afternoon because of daytime heating.

People going to the outdoor Pearl Harbor activities this weekend should prepare for rain, forecasters said.

The World War II movie “Twelve O’Clock High,” is scheduled to be shown tonight at Kuhio Beach. “Run Silent, Run Deep,” will be shown Sunday in Waikiki and there’s a block party in Kakaako Sunday evening. On Monday evening, Gary Sinise and the Lt. Dan Band are giving an outdoor concert before a showing of “From Here to Eternity” in Waikiki.

Events are also scheduled for the Pearl Harbor Visitors Center.

“It (rains) are going to kind of shift from everything concentrated over the Big Island,” Foster said. “It’s going to be moving over us (Oahu and western islands) this weekend.”

Foster said it will be difficult to predict exactly where and when rains will fall. The unstable weather conditions mean that there is a potential for rains statewide, but it’s not clear where and when the showers will happen.

“It’s going to be kind of wet throughout the state,” he said.

Hawaii island and Kauai got the most rain overnight.

In the 24-hour period ending at 7 a.m., more than 6.2 inches fell in Pahoa and more than 5 inches were recorded at the Hilo Airport, Waiakea and Saddle Quarry. On Kauai, 2.3 inches fell at Mt. Waialeale, more than 1.8 inches was recorded at Kilohana, and more than 1.4 inches fell in Wainiha, and the North Wailua Ditch.

On Oahu, about 1.6 inches fell at Poamoho, and more than 1.4 inches fell in Manoa.