(Meredith/CNN) – Residents in Hawaii are preparing for Hurricane Lane, the largest hurricane to hit the state in decades.

It could be so devastating that authorities are urging residents to set aside two weeks' worth of food and water.

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Landslides are a concern, with 10-30 inches of rain forecast through the weekend -- and slides already were happening on the Big Island as the storm's outer bands hit Thursday morning.

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Hawaii is a small target in a vast ocean and isn't often threatened: Hawaii gets a named storm within 60 miles of its coastline about once every four years on average, forecasters say.

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