Effective at 8 p.m. Tuesday, the Coast Guard Sector San Juan captain of the port set port condition X-ray for the USVI and Puerto Rico due to the expectation of sustained gale force winds of 25 mph and gusts up to 40 mph generated by tropical storm Isaac that may arrive within 48 hours.
The mayor of a SC city in the path of powerful Hurricane Florence is warning citizens to get out or stay "at your own peril".
If these projections hold, University of Miami hurricane researcher Brian McNoldy says "it's exceptionally bad news, as it smears a landfall out over hundreds of miles of coastline, most notably the storm surge".
The storm is now around 530 miles southeast of Cape Fear, North Carolina, and is moving west-northwest at 17 mph.
"Isaac is forecast to become a tropical depression on Sunday and degenerate into a wave on Monday, however this is an uncertain prediction", the center's Friday evening advisory said.
Meanwhile, the projections for rain are growing, adding to growing concerns about flooding across the two states: Coastal North Carolina now expects 20-30 inches, with isolated areas of 40 inches projected in SC.
The storm is projected to shift northeast with an increase in forward speed in the coming days, forecasters said.More news: Final Fantasy XV: Pocket Edition HD for Switch launches today
A small-craft warning means in this case that surface winds greater than or equal to 25 knots and seas equal to or greater than 3 metres (10ft) are already affecting or expected to affect the marine area.
Hurricane Florence isn't the only storm threatening lives and property around the world.
From the Ocracoke Inlet to the North Carolina-Virginia border and from the South Santee River to North Myrtle Beach, the NHC forecast that water could rise as high as 6 feet.
It was a potentially catastrophic Category 4 storm but was expected to keep drawing energy from the warm water and intensify to near Category 5, which means winds of 157 miles per hour (253 kph) or higher.
Tropical-storm-force winds extend outward up to 105 miles (165 km) from the center.
When the National Hurricane Updates shared a map of the category four hurricane, dubbed "the storm of a lifetime", on Facebook, people were quick to compare the pink round-headed shape displaying the devastation to something a lot less serious.
A Tropical Storm Warning is in effect for. However, the center of Florence could hit as early as Thursday night rather than Friday morning, according to the latest NOAA estimates at the time of this writing.