The Big Island was placed under a flash flood advisory Wednesday afternoon, and is expected to last until 7 p.m.
At 4:30 p.m. radar showing heavy rain over the Big Island, particularly over the Kau and Kona Slopes.
The National Weather Service has also placed Maui, Molokai, Lanai, Kahoolawe and the Big Island under a flash flood watch from Wednesday night until Friday morning.
Forecasters say unstable air masses have created heavy rainfall, even thunderstorm conditions over the east half of the state.
This precipitation is also creating snow atop Mauna Kea, prompting a winter storm advisory for Mauna Loa and Mauna Kea that is expected to last until 6 a.m. Friday.
High surf warnings have also been posted for northern shores of Oahu, Maui and Molokai as well as western shores of Kauai, Niihau and the Big Island.
Waves are expected to reach into the 20 to 30 foot range for those shores.
The warning is in place from Thursday morning until Friday morning.