For those in evacuation zones, waiting until the last moment can make leaving more difficult. Roads can become congested, weather conditions can worsen, and essential supplies may become harder to find.
The coming hours will be closely watched as forecasters gather additional information about Melissa’s strength and movement.
What began as another developing tropical system has become a serious weather threat, and the focus now turns to the communities that could find themselves directly in its path.
For millions watching the forecast, one thing is clear: the situation can change quickly, and the next update could significantly alter the picture.