Heavy rain will likely be the storm's biggest impact; flash flood watches are in effect for all of the islands.

Twenty inches of rain have already fallen on parts of the Big Island.

\"PHOTO:
Mario Tama/Getty Images
PHOTO: A man takes photos of floodwaters from Hurricane Lane rainfall on the Big Island, Aug. 23, 2018, in Hilo, Hawaii. Hurricane Lane has brought more than a foot of rain to some parts of the Big Island which is under a flash flood warning.
>

The rainfall caused landslides on a highway on the Big Island, the National Weather Service said, citing county officials.

Life-threatening surf is also expected across the islands over the next few days. The large waves and storm surge will push water levels 2 to 4 feet above normal tide levels, especially along the state's southern and western shores.

\"PHOTO:
Kat Wade/Getty Images
PHOTO: Thomas Jefferson Elementary School displays a sign reflecting Honolulu Mayor Kirk Caldwell's closure of all public schools on Aug. 23 and Aug. 24th due to the threat of Hurricane Lane on Aug. 22, 2018 in Honolulu.
>

Maui County Mayor Alan Arakawa stressed the severity of the storm during a press conference Wednesday.

\"This is the most serious ... and I've been alive 63 years,\" Arakawa told reporters.

\"Undoubtedly, we're more prepared then we've ever been,\" he added.

\"PHOTO:
Kat Wade/Getty Images
PHOTO: Yamasaki Construction workers, Talbot Khakai, left, and David Halafihi board up McDonalds multiple plate glass windows in preparation for Hurricane Lane on Aug. 22, 2018 in Honolulu.
>

President Donald Trump said he authorized an emergency disaster declaration to provide support to Hawaii.

\"Our teams are closely coordinating with the state and local authorities,\" he tweeted Thursday. \"You are in our thoughts!\"

Water, meals and generators are being delivered to the islands and evacuation centers were opened in all four counties, officials said.

Over 300 people are already at evacuation centers and that number is expected to significantly increase over the coming days, said Brad Kieserman of the American Red Cross.

Hawaiian residents and visitors flocked to stores to stock up on food, water and gas ahead of the storm. Some businesses and homes have already been boarded up.

Empty shelves and plenty people at Target. This is what happens when a Cat5 threatens one of the world’s most geographically isolated island chains. #hiwx #hurricanelane pic.twitter.com/QTWN0EDIB7

— Ben Nishimoto (@Ben_Nishimoto) August 22, 2018

It's rare for hurricanes to hit Hawaii. An area of high pressure that sits to the northeast of the islands typically steers hurricanes away. This high pressure is the strongest from May through October, which is also prime hurricane season.

The Hawaiian islands are also surrounded by cool water and tropical cyclones need ocean water temperatures to exceed 80 degrees to strengthen.

The last hurricane to make landfall in Hawaii was Iniki in 1992. Lane would be the third on record.

\"PHOTO:
NASA via AP
PHOTO: This image provided by NASA on Aug. 22, 2018 shows Hurricane Lane as seen from the International Space Station.
>

Category 1 Hurricane Dot hit in 1959 and catastrophic Category 4 Iniki came ashore in 1992. Both made landfall on the island of Kauai.

Category 1 Hurricane Iwa also had a major impact on Kauai in 1982, but because its eye did not hit the island, it wasn't officially counted as making landfall there.

ABC News' Gio Benitez, Max Golembo, Christine Theodorou and Crystal Muguerza contributed to this report.

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