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Only five other Atlantic hurricanes have been recorded with wind speeds higher than Irma: Hurricane Allen of 1980, which had maximum sustained winds of 190 mph (310 km/h), and the 1935 Labor Day hurricane, Hurricane Gilbert of 1988, Hurricane Wilma of 2005, and Hurricane Dorian of 2019, all of which had peak winds of 185 mph (298 km/h). [267]
By this time, the NHC anticipated Irma would maintain its intensity before making landfall in the state of Florida later that day. In addition, Irma's wind field continued to increase in size, with hurricane-force winds spanning out a region of 80 mi (130 km) and gale-force winds spanning 220 mi (350 km) in diameter. [17]
Hurricane Irma was the costliest tropical cyclone in the history of the U.S. state of Florida, before being surpassed by Hurricane Ian in 2022. Irma also was the first major hurricane [nb 1] to strike the state since Wilma in 2005 and the first Category 4 hurricane to make landfall in Florida since Charley in 2004.
The Hurricane Severity Index (HSI) is another scale used and rates the severity of all types of tropical and subtropical cyclones based on both the intensity and the size of their wind fields. [34] The HSI is a 0 to 50 point scale, allotting up to 25 points for a tropical cyclone's intensity and up to 25 points for wind field size. [34]
September 25, 1998 – Hurricane Georges passes over Key West as a Category 2 hurricane, and days later it moves eastward through the Florida Panhandle after hitting Biloxi, Mississippi. In the Florida Keys, the hurricane produced 8.41 inches (214 mm) of rain in Tavernier and wind gusts peaking at 110 mph (175 km/h) in Marathon.
The parks were last closed in 2016 for Hurricane Matthew. While the parks survived the Category 4 storm with just minor damage, some visitors have tweeted photos of downed trees and flooding.
A Category 5 Atlantic hurricane is a tropical cyclone that reaches Category 5 intensity on the Saffir–Simpson hurricane wind scale, within the Atlantic Ocean to the north of the equator. They are among the strongest tropical cyclones that can form on Earth, having 1-minute sustained wind speeds of at least 137 knots (254 km/h; 158 mph; 70 m/s).
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