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The official Atlantic hurricane season runs from June through November, but occasionally storms form outside those months. Seasonal hurricane forecasting from Colorado State University is available here.
A tropical cyclone is a rotating low-pressure weather system that has organized thunderstorms but no fronts, according to the National Oceanic and Atmospheric Administration. Hurricanes are tropical cyclones which have sustained winds of 74 mph. At this point a hurricane reaches Category 1 on the Saffir-Simpson Hurricane Wind Scale, which has a range of 1 to 5, based on the hurricane's intensity at the time of landfall at the location experiencing the strongest winds. The scale provides examples of the type of damage and impacts in the United States associated with winds of the indicated intensity. It does not address the potential for other hurricane-related phenomena such as storm surge, rainfall-induced floods and tornadoes.
The chart below shows insured losses in dollars for the top 10 costliest hurricanes in the United States when they occurred and in 2021 dollars, adjusted for inflation. According to Aon, Katrina was the costliest hurricane on record, causing $65 billion in insured losses when it occurred in 2005, including losses from the NFIP. Losses from Katrina totaled $89.7 billion in 2021 dollars.
($ millions)
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