royal police. the entire bahamas island chain is facing extreme flooding from roads to hospitals, to the freeport international airport which is completely submerged making rescue efforts even more difficult, supplies nearly impossible to deliver. this satellite image of grand bahama island shows just how much of the island was under water after dorian passed through on monday. tonight the storm that reached so much havoc there is headed here, to the u.s. coast, moving slowly northwet, pushing wind and storm surge towards the coastline. many florida counties are still under mandatory evacuation orders. this is going to be riding florida s coast for the next day, day-and-a-half, while we think this is a much better track than we were looking at 72 hours ago, we just ask people to stay safe, remain vigilant. reporter: a low lying community in martin county, officials say three-quarters of the town evacuated. two large rivers and the ocean converged near here.