All eyes are on Hurricane Florence, now that it has intensified to a major Category 4 storm and is heading to the southeastern US coast.
Spaghetti plots from hurricane forecast models and other weather forecast models show the likelihood of Florence making landfall in the United States is now significantly higher, with the cone narrowed on the Carolina's. Residents in this part of the east coast should prepare now for the possibility of a major hurricane at landfall. Such swells can lead to unsafe surf and rip currents, the NHC warned.
But the gravest threat to the US remains Hurricane Florence, which is expected to strengthen to a major hurricane by Monday night and remain "an extremely unsafe major hurricane" through Thursday, according to the Hurricane Center.
"Florence is. expected to remain an extremely risky major hurricane through Thursday", the hurricane center warned. While the storm is expected to batter spanning the Southeast to the Mid-Atlantic region, it will likely have little to no impact on MA, forecasters say.
With winds of 115 miles per hour (185 kph), the storm had reached Category 3 strength on the five-step Saffir-Simpson scale by 11 a.m. on (1500 GMT) on Monday, according to the National Weather Service. "Damaging hurricane-force winds are likely along portions of the coasts of SC and North Carolina, and a Hurricane Watch will likely be issued by Tuesday morning".
The storm has prompted the governors of North Carolina, South Carolina and Virginia to each declare state of emergencies in their states.
South Carolina Gov. Henry McMaster also suspended his campaign and asked President Donald Trump for a federal emergency declaration.
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Both Tropical Storm Isaac and Tropical Storm Helene are expected to reach hurricane strength later today, but neither are considered potential threats. Florence is predicted to bring "life-threatening impacts" to North Carolina and neighboring states late this week.
The coasts of SC and North Carolina have only been hit by about a dozen Category 3 storms since 1850.
Helene, meanwhile, was still in the Atlantic's spawning ground for hurricanes off the coast of Africa, swirling with 105 mph (165 kmh) winds and forecast to become a major hurricane, about 375 miles (600 kilometers) west of the Cape Verde islands.
Florence is now a category 4 hurricane.
At 1500 GMT, Isaac, which the NHC called a small hurricane, was about 1,150 miles (1,855 kms) east of the Windward Islands - a region still recovering from last year's powerful Hurricane Maria - with maximum sustained winds near 75 mph (120 kph). That storm was centred 185 km south southeast of the islands.
Hurricane Florence will be a devastating storm after landfall.