Much of Florida's Gulf Coast is under an evacuation order – and a "king tide" could make flooding worse

Hurricane Idalia is barreling toward Florida and is expected to affect a large portion of the state and bring a massive storm surge. The flooding may be made worse due to a so-called "king tide." What is that and how is it affecting evacuation orders?

The non-scientific term describes extremely high ocean tides, according to the National Oceanic and Atmospheric Administration. Tides are affected by the gravitational pull of the moon and sun, and are usually higher when the moon is new or full.