The hatched areas on the National Hurricane Center's tropical outlook map indicate "areas where a tropical cyclone — which could be a tropical depression, tropical storm or hurricane — could develop," said National Hurricane Center Deputy Director Jamie Rhome.

The National Hurricane Center issued a warning for four major U.S. states on Monday morning. Heavy storms could be approaching part of the Gulf Coast this week. There is apparently an area of low localized pressure off of the east coast of Florida that could cause a disturbance later in the week.