Dartmouth Met Office

SALLY has been upgraded to a class two hurricane, capable of delivering 16in of rain and 11ft of water.

In the path of the monster storm lies the Florida coast, but Sally is a considerable and formidable beast.

Latest estimates from the state warn there will be 16in of rain in a week, while another 10in could fall over a month, with most of it expected to fall in just a week.

Dartmouth Met Office

Hurricane season kicks off in two weeks and storms form in tropical depressions, but the arrival of storms in the centre of a hurricane sets up a fascinating pattern.

Usually, when the main eye first moves inland – such as when Matthew struck the US last month – some of the storm’s outer bands will be over the centre of the hurricane’s centre.

However, once Sally makes landfall, the immediate threat will be on the coast itself.

Only two weeks ago, Sally swept across the Florida coast, tearing apart coastal homes and driving some 4,500 people to the shelters of emergency shelters.

Hurricane was upgraded to hurricane force 4.15pm BST this afternoon

Sally also poses a huge threat to Florida’s south Florida, battered in nearly a dozen deaths in the state.

Category-three Irma has also been downgraded to a category two hurricane from the category three that first made landfall near the Mexican border earlier this week.

Sally is on course to hit Florida, Georgia and the Carolinas later this week.