India, Sept. 29 -- Hurricane Humberto has strengthened into a Category 5 storm, while Tropical Depression Nine is forecast to become a hurricane by Tuesday, according to NBC report.

Both storms are moving north and are expected to stay offshore along the Southeast and mid-Atlantic coasts.

According to a 5 p.m. advisory from the National Hurricane Center, Humberto reached 160 mph winds, passing the 157 mph threshold for Category 5.

"Humberto will likely remain a powerful major hurricane for the next several days," the center said.

The storm was about 350 miles north-northeast of the northern Leeward Islands, moving north-northwest at 10 mph. For the US mainland, the main issue will be rough surf, federal forecasters said.

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