UPDATE: 8:45 a.m.

Hawaii island is under a flood advisory through 11:30 a.m. today.

Radar at 8:36 a.m. showed heavy rain over the northern slopes of the Kohala Mountains, National Weather Service officials said in a bulletin. “The most intense rainfall was occurring from Hawi to Pololu Valley,” the NWS said. “The band of heavy rain may spread southward into the Waipio Valley and Honokaa areas.”

Locations in the advisory include, but are not limited to, Pololu Valley, Waipio Valley, Kukuihaele, Kohala Ranch, Hawi, Kamuela, Kapaau, Waimanu Valley and Honokaa.

7:20 a.m.

An earlier flood advisory for Oahu has expired but weather officials expect showers to spread across the state today.

“Colder temperatures with breezy to windy trade winds will move in behind the front,” the National Weather Service said in their forecast for today. Expect “cloudy skies, numerous showers and isolated thunderstorms.”

5:25 a.m.

A flood advisory is in effect for Oahu through 7:15 a.m. today.

Radar at 5:20 a.m. indicated heavy rain across portions of Windward Oahu with rain falling at a rate of 1 to 2 inches per hour, according to the National Weather Service.

Locations in the advisory include, but are not limited to, Ahuimanu, Hauula, Waimanalo, Kailua, Manoa, Maunawili, Kaneohe, Kahuku, Waikane, Kaneohe Marine Base, Hawaii Kai and Laie.

PREVIOUS COVERAGE

Chilly temperatures and large surf continued for the Hawaiian Islands as wetter weather returned Tuesday night.

Surf up to 18 to 22 feet is expected Wednesday along the east-facing shores of Kauai, Oahu, Molokai, Maui and the Big Island due to a reinforcing north-northeast swell building across local waters. A high surf warning for the east-facing shores of those islands remains in effect through 6 p.m. Thursday.

A high surf advisory also remains in effect for the north-facing shores from Kauai to the Big Island through 6 p.m. Thursday.

Besides strong, breaking waves, weather officials warn of strong longshore and rip currents, making swimming difficult and dangerous. Anyone entering the water could face significant injury or death.

A winter storm watch – meaning there is potential for snow, sleet or ice — has once again been issued for the Haleakala and Big Island summits.

The National Weather Service said very cold air aloft will once again move over the islands, beginning tonight and continuing into Friday. Additionally, moisture is expected to occasionally spread to the elevations of the summits, with bouts of winter weather expected.

Haleakala National Park remains closed this morning due to extreme weather conditions at the summit district. A high wind warning, which was issued earlier for the Big Island summits, has been canceled.

Across the isles, meanwhile, overnight temperatures dipped into the 50s and 60s range, accompanied by brisk winds. Tonight will once again be cloudy and breezy, with occasional showers.

Temperatures tonight are expected to range from lows of 56 to 64 degrees on Oahu’s South Shore, with northeast winds of 15 to 20 miles per hour, 58 to 65 on the Waianae coast, 55 to 61 in Central Oahu, and 60 to 66 degrees on the windward side, including Kailua, Kaneohe and Waimanalo.

Forecasters said northerly winds will be shifting to the north-northeast today, then northeast tonight as the surface low that brought high surf and winds lifts further away from the islands. A wet trade pattern is likely for the islands between tonight and Thursday, with “a high degree of uncertainty” for the upcoming weekend.

Forecasters said a band of enhanced showers coming from the north is expected to arrive on Kauai this evening, and hit the rest of the isles overnight, and the Big Island on Wednesday morning. A cold pool of air at the higher levels could bring freezing levels from an altitude of 12,000 feet to 9,000 feet by Wednesday afternoon and evening.

A slight chance of thunderstorms is also possible for Maui and the Big Island.