Thousands prepare for evacuations in Hawaii as volcanic eruption looms

Lava on the street
A lava flow moves on Makamae Street after the eruption of Hawaii's Kilauea volcano. Photo: U.S. Geological Survey via Getty Images

Hawaii is likely facing another volcanic eruption that scientists warn could occur virtually without warning as the Hawaii National Guard prepares to use ground and air means to rescue residents of Hawaii's Big Island, USA Today reports.

Threat level: "The danger comes from the lava level that is dropping inside the volcano. If it falls below the water table, water will pour onto the lava, generating steam that will likely explode from the summit in a shower or rocks, ash and sulfur dioxide gases."