The natural disaster that has been the most expensive in terms of insurance losses in the period from 1970 to 2016 is hurricanes.
A tropical storm that has sustained winds of 74 mph or greater is referred regarded as a hurricane. A storm's eye typically measures 20 to 30 miles in width and can reach distances of 400 miles. Storms can be dangerous because of their torrential downpours, strong gusts, and storm surges.
Hurricanes are formed when warm water, moist warm air, and weak upper-level winds combine. Hurricanes form when rapidly rising volumes of warm, humid air from ocean surfaces combine with larger masses of cooler air. Typically, a hurricane lasts between 12 and 24 hours. However, as Hurricane John in 1994 shows, a hurricane can persist for up to a month.
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