Residents in the nearby areas should also be prepared to evacuate with little notice, officials said.
Helicopter footage from the U.S. Geological Survey on Monday showed lava from one fissure entering the ocean at Kapoho Bay.
Scientists said a laze plume was blowing inland from the ocean entry but dissipating quickly. Laze is formed when hot lava hits the ocean, reacts with sea water and sends hydrochloric acid and steam with fine glass particles in the air.
Officials warned the public to stay away from the plume because it can irritate skin and eyes and make it difficult to breathe.