At 11 p.m. later that day, it weakened further to a tropical depression, and by Sept. 13, it had dissipated over western Tennessee. Irma is the fifth-costliest hurricane to hit the mainland United States, causing an estimated $50 billion in damage, according to the National Hurricane Center.
How many people did Hurricane Irma affect?1.2 million people Hurricane Irma: Damage mapped. The most powerful Atlantic storm in a decade has left a trail of destruction in the Caribbean, affecting an estimated 1.2 million people. Irma, now downgraded to a tropical storm, reached the highest, category five status, and packed sustained winds of up to 295km/h (185mph).