What is a storm surge, and what is the threat from Hurricane Milton?

Storm surges often pose great danger when hurricanes such as Milton hit - here's what you need to know

Hurricane Milton has made landfall in Florida and millions of residents in the state have been told to evacuate.

Although the hurricane was downgraded to a strong category 3, forecasters said it would still make landfall as an extremely dangerous major hurricane". No one in the area has ever experienced a hurricane this strong before," the National Weather Service said.