The Weather Service said that, regardless of Lane's eventual track and intensity, computer models are pointing to an extremely moist tropical air mass moving over the islands beginning around Wednesday through the end of the week. Forecasters say hurricane winds extend 30 miles from the center of the storm.
The center said Lane's heavy rain and strong winds could bring heavy swells, flash flooding and landslides.
Longtime Hawaii residents recalled a devastating 1992 hurricane as they prepared for Hurricane Lane.
"The seriousness of the worst-case possibilities with Lane, and the rarity of the situation, call for an especially high level of preparation and vigilance among all Hawaiians", Weather Underground said, adding that the storm was heading towards "a potentially devastating encounter" with the state.
The NWS says a hurricane warning is in effect for Maui and Hawaii, which is also known as the Big Island, while the islands of Kauai and Oahu, where Honolulu is located, are under a hurricane watch.
Members of the Alapahoe outrigger canoe club move their canoes off the beach to higher ground as Hurricane Lane approaches Honolulu, Hawaii, U.S. August 21, 2018.
The CPHC said little change in strength was expected through Monday, with gradual weakening forecast from Monday night through Tuesday.
A hurricane warning is usually made about 36 hours before tropical-storm-force winds are expected to hit a location. Mount Kilauea began producing lava flows in early May and portions of the southeastern coastline of the Big Island have been transformed by the lava flows that covered over 13 square miles (35 square kilometers).
But Hurricane Lane looks poised to bring much more significant impacts to the state, as the forecast puts the storm very close to the islands, with a direct landfall is possible later this week.
At 8 a.m. Wednesday, the Central Pacific Hurricane Center said Hurricane Lane was still a Category 4 storm, packing maximum sustained winds near 155 miles per hour with higher gusts after weakening slightly overnight.
Hurricane Lane, hurricane force (74 mph+) wind probabilities. There's uncertainty to Lane's path - whether it moves north or south, meteorologist Gavin Shigesato said.
Dye says rain associated with the hurricane has started to show up on radar off the Big Island of Hawaii and offshore buoys are detecting higher than normal waves.
Through Saturday, 10-15 inches of rain are generally expected, with isolated amounts greater than 20 inches, the Central Pacific Hurricane Center said. Slight weakening is possible later today or tonight, but Lane will likely remain a powerful hurricane through Monday night, according to forecasters at the Central Pacific Hurricane Center.