Weather authorities downgraded Hurricane Florence to a tropical depression on Sunday, September 16, but flooding remained a serious threat to the coastal Carolina cities.br br This video, filmed in Wilmington, North Carolina, shows a neighborhood severely flooded.br br About 740,000 homes and businesses are still without power, and at least 18 people have died in storm-related incidents. The latest death involved a driver who was killed when they lost control of their pickup truck and struck a tree near Gilbert, South Carolina, local media reported.br br The National Hurricane Center said Florence is still expected to produce excessive rainfall as it turns from the Carolinas over the Mid-Atlantic and southern New England early this week.