Atlantic hurricanes: Irma and Maria

On Tuesday 5th September, Hurricane Irma developed into one of the Atlantic’s most powerful storms. The category 5 hurricane - highest category storm on the Saffir-Simpson scale (a commonly used scale that attempts to measure potential property damage from storm winds) - had wind speeds around 185 mph, matching those of Wilma in 2005 which killed 87 people and cost  billions of dollars in damage.