Florence likely 'the storm of a lifetime' for Carolinas: National Weather Service

PHOTO: People cross the street as water floods outside buildings in Old Town Alexandria, Va., Sept. 11, 2018.PlayZach Gibson/AFP/Getty Images
WATCH Florence targets Carolinas' coast as Category 4 hurricane

Hurricane Florence, a powerful Category 4 storm moving closer to North and South Carolina, will bring wind and waves that may be "nothing like you’ve ever seen," North Carolina Gov. Ray Cooper said Tuesday.

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"This storm is a monster," Cooper told reporters at a news conference. "It’s big and it’s vicious. It is an extremely dangerous, life threatening, historic hurricane."

"This will likely be the storm of a lifetime for portions of the Carolina coast," the National Weather Service spokesperson in Wilmington said Tuesday night. "I can't emphasize enough the potential for unbelievable damage from wind, storm surge, and inland flooding with this storm."

The storm is forecast to make landfall early morning Friday between midnight and 5 a.m. as a major hurricane.

FEMA administrator Brock Long warned that power could be knocked out for weeks.

"This has an opportunity of being a very devastating storm," Long said Tuesday. "The power will be off for weeks. You're going to be displaced from your home in coastal areas. There will be flooding in the inland areas as well."

The U.S. Department of Health and Human Services declared a public health emergency in North Carolina and South Carolina on Tuesday.

“These actions help ensure that Americans who rely on Medicare and Medicaid have continuous access to the care they need when the storm makes landfall,” said HHS Secretary Alex M. Azar.

PHOTO: Hurricane Florence Forecast TrackABC News
Hurricane Florence Forecast Track

PHOTO: Hurricane Florence ImpactsABC News
Hurricane Florence Impacts

One serious danger is flooding.

"All the predictions are when it gets to the coast it’ll be moving slow so it’ll be dumping rain on us and North Carolina for a long time," South Carolina Gov. Henry McMaster told "Good Morning America” Tuesday. "This hurricane is big and strong and it’s bigger than Hurricane Hugo, which we had back in 1989."

Heavy rain could flood hog manure pits and industrial sites in North Carolina, according to the Associated Press. That tainted water could wash into houses, and affect drinking water.

PHOTO: Michael Schwartz (L) and Jay Schwartz secure plywood over the windows of their business ahead of the arrival of Hurricane Florence, Sept. 11, 2018, in Myrtle Beach, S.C.Joe Raedle/Getty Images
Michael Schwartz (L) and Jay Schwartz secure plywood over the windows of their business ahead of the arrival of Hurricane Florence, Sept. 11, 2018, in Myrtle Beach, S.C.

North Carolina and Virginia could get up to 30 inches of rain while Richmond, Virginia, and Washington, D.C., could see more than 10 inches of rain.

PHOTO: Hurricane Florence Rainfall ForecastABC News
Hurricane Florence Rainfall Forecast

Storm surge is also a major threat, potentially reaching 12 feet in some areas.

PHOTO: Hurricane Florence Storm SurgeABC News
Hurricane Florence Storm Surge

PHOTO: Hurricane Florence Storm SurgeABC News
Hurricane Florence Storm Surge

As the storm churns ahead with 130 mph winds, states of emergency have been declared in South Carolina, North Carolina, Virginia and Maryland and Washington, D.C.

Residents and visitors on South Carolina's coast were ordered to evacuate Tuesday.

PHOTO: Mike Herring with Franks Ice Company unloads another pallet of ice as people buy supplies at The Home Depot on Monday, Sept. 10, 2018, in Wilmington, N.C.AP
Mike Herring with Frank's Ice Company unloads another pallet of ice as people buy supplies at The Home Depot on Monday, Sept. 10, 2018, in Wilmington, N.C.

Boeing is suspending its operations in South Carolina because of the storm threat.

Some coastal areas of North Carolina and Virginia are also under mandatory evacuation orders.

Some Virginia inmates are among those evacuating, according to the state's Department of Corrections.

PHOTO: Walker Townsend, at right, from the Isle of Palms, S.C., fills a sand bag while Dalton Trout, in center, holds the bag at the Isle of Palms municipal lot in preparation for Hurricane Florence at the Isle of Palms S.C., Monday, Sept. 10, 2018.AP
Walker Townsend, at right, from the Isle of Palms, S.C., fills a sand bag while Dalton Trout, in center, holds the bag at the Isle of Palms municipal lot in preparation for Hurricane Florence at the Isle of Palms S.C., Monday, Sept. 10, 2018.

Slideshow: Worst hurricanes in US history
SLIDESHOW: Slideshow: Worst hurricanes in US history

ABC News' Jason Volack contributed to this report.

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