With mandatory evacuations already issued for parts of three East Coast states, millions of Americans are preparing for what could become one of the most catastrophic hurricanes to hit the Eastern Seaboard in decades.

Map shows probable path of Hurricane Florence. ; 1c x 3 inches; 46.5 mm x 76 mm;
This photo provided by NASA shows Hurricane Florence from the International Space Station on Monday, Sept. 10, 2018, as it threatens the U.S. East Coast. Forecasters said Florence could become an extremely dangerous major hurricane sometime Monday and remain that way for days. (NASA via AP)
Jim Craig, David Burke and Chris Rayner load generators as people buy supplies at The Home Depot on Monday, Sept. 10, 2018, in Wilmington, N.C. Hurricane Florence rapidly strengthened into a potentially catastrophic hurricane on Monday as it closed in on North and South Carolina, carrying winds and water that could wreak havoc over a wide stretch of the eastern United States later this week. (Ken Blevins/The Star-News via 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. Hurricane Florence rapidly strengthened into a potentially catastrophic hurricane on Monday as it closed in on North and South Carolina, carrying winds and water that could wreak havoc over a wide stretch of the eastern United States later this week. (Ken Blevins/The Star-News via AP)
Alex Gilewicz buys supplies at The Home Depot on Monday, Sept. 10, 2018, in Wilmington, N.C. Residents of Wilmington and Southeastern N.C. Florence rapidly strengthened into a potentially catastrophic hurricane on Monday as it closed in on North and South Carolina, carrying winds and water that could wreak havoc over a wide stretch of the eastern United States later this week. (Ken Blevins/The Star-News via AP)
Chris Rayner helps customers load their cars as they buy supplies at The Home Depot on Monday, Sept. 10, 2018, in Wilmington, N.C. Hurricane Florence rapidly strengthened into a potentially catastrophic hurricane on Monday as it closed in on North and South Carolina, carrying winds and water that could wreak havoc over a wide stretch of the eastern United States later this week. (Ken Blevins/The Star-News via AP)
James Wemyss puts out more supplies at The Home Depot on Monday, Sept. 10, 2018, in Wilmington, N.C. Florence rapidly strengthened into a potentially catastrophic hurricane on Monday as it closed in on North and South Carolina, carrying winds and water that could wreak havoc over a wide stretch of the eastern United States later this week. (Ken Blevins/The Star-News via AP)
People buy supplies at The Home Depot on Monday, Sept. 10, 2018, in Wilmington, N.C. Florence rapidly strengthened into a potentially catastrophic hurricane on Monday as it closed in on North and South Carolina, carrying winds and water that could wreak havoc over a wide stretch of the eastern United States later this week. (Ken Blevins/The Star-News via AP)
Brian Franklin prepares more generators for sale as people buy supplies at The Home Depot on Monday, Sept. 10, 2018, in Wilmington, N.C. Hurricane Florence rapidly strengthened into a potentially catastrophic hurricane on Monday as it closed in on North and South Carolina, carrying winds and water that could wreak havoc over a wide stretch of the eastern United States later this week. (Ken Blevins/The Star-News via AP)
Kevin Orth loads sandbags into cars on Milford Street as he helps residents prepare for Hurricane Florence, Monday, Sept. 10, 2018, in Charleston, S.C. (Grace Beahm Alford/The Post And Courier via AP)
People shop at the Harris Teeter, filling up on water and supplies as Hurricane Florence becomes a threat to the coast Monday, Sept. 10, 2018, in Charleston, S.C. (Grace Beahm Alford/The Post And Courier via AP)
Esta fotografía proporcionada por la NASA muestra al huracán Florence desde la Estación Espacial Internacional, el lunes 20 de septiembre de 2018. (NASA vía AP)
Chris Brace, from Charleston, S.C. lowers hurricane shutters on a client’s house in preparation for Hurricane Florence at Sullivan’s Island, S.C., Monday, Sept. 10, 2018. Brace said that after S.C. Gov. Henry McMaster ordered an evacuation the property owner asked for the house to be boarded up. (AP Photo/Mic Smith)
Chris Brace, from Charleston, S.C. lowers hurricane shutters on a client’s house in preparation for Hurricane Florence at Sullivan’s Island, S.C., Monday, Sept. 10, 2018. Brace said that after S.C. Gov. Henry McMaster ordered an evacuation the property owner asked for the house to be boarded up. (AP Photo/Mic Smith)
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 where the city was giving away free sand in preparation for Hurricane Florence at the Isle of Palms S.C., Monday, Sept. 10, 2018. (AP Photo/Mic Smith)
Walker Townsend, at left, from the Isle of Palms, S.C., fills a sand bag while Dalton Trout, at right, holds the bag at the Isle of Palms municipal lot where the city was giving away free sand in preparation for Hurricane Florence at the Isle of Palms S.C., Monday, Sept. 10, 2018. (AP Photo/Mic Smith)
Residents of the Isle of Palms, S.C., fill sand bags at the Isle of Palms municipal lot where the city was giving away free sand in preparation for Hurricane Florence at the Isle of Palms S.C., Monday, Sept. 10, 2018. (AP Photo/Mic Smith)
Larry Pierson, from the Isle of Palms, S.C., purchases bottled water from the Harris Teeter grocery store on the Isle of Palms in preparation for Hurricane Florence at the Isle of Palms S.C., Monday, Sept. 10, 2018. (AP Photo/Mic Smith)
Governor Roy Cooper talks to emergency personnel local officials and members of the media about the ongoing Hurricane Florence preparation efforts in the Emergency Operations Center at the New Hanover County Administration Building In Wilmington, N.C. Sept. 10, 2018. Hurricane Florence now a category 3 hurricane is expected to make land fall somewhere along the North Carolina coastline towards the end of the week. (Ken Blevins /The Star-News via AP)
Roberts Grocery Store in Wrightsville Beach, N.C. boards up it’s windows as they prepare for Hurricane Florence Monday, Sept. 10, 2018. Hurricane Florence now a category 3 hurricane is expected to make land fall somewhere along the North Carolina coastline towards the end of the week. (Ken Blevins /The Star-News via AP)
Jim Carter and Rob Quinn board up Lagerheads Tavern in Wrightsville Beach, N.C. as they prepare for Hurricane Florence Monday, Sept. 10, 2018. Hurricane Florence now a category 3 hurricane is expected to make land fall somewhere along the North Carolina coastline towards the end of the week. (Ken Blevins /The Star-News via AP)
Rob Quinn boards up Lagerheads Tavern in Wrightsville Beach, N.C. as they prepare for Hurricane Florence Monday, Sept. 10, 2018. Hurricane Florence now a category 3 hurricane is expected to make land fall somewhere along the North Carolina coastline towards the end of the week. (Ken Blevins /The Star-News via AP)
Alexis Browning enjoyed the sunny weather and waves along Wrightsville Beach, N.C. as others prepared for Hurricane Florence Monday, Sept. 10, 2018. Hurricane Florence now a category 3 hurricane is expected to make land fall somewhere along the North Carolina coastline towards the end of the week. (Ken Blevins /The Star-News via AP)
In this Monday, Sept. 10, 2018, photo released by the U.S. Navy, the guided-missile destroyer USS Nitze departs Naval Station Norfolk after the announcement of Hurricane Florence, in Norfolk, Va. (U.S. Navy photo by Mass Communication Specialist 2nd Class Justin Wolpert/U.S. Navy via AP)

Several meteorologists said Florence could do what Hurricane Harvey did last year over Texas, dumping days of rain, although not quite as bad.

Source: AP

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