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The NHC and the Central Pacific Hurricane Center assign tropical cyclone intensities in 5 knot increments, and then convert to mph and km/h with a similar rounding for other reports. So an intensity of 115 kn is rated Category 4, but the conversion to miles per hour (132.3 mph) would round down to 130 mph, making it appear to be a Category 3 storm.
A Category 4 hurricane has winds of 113 to 136 kn (130 to 157 mph; 209 to 252 km/h), while a Category 5 hurricane has winds of at least 137 kn (158 mph; 254 km/h). [1] [3] A post tropical cyclone is a system that has weakened, into a remnant low or has dissipated and formal advisories are usually discontinued at this stage. [1]
The Saffir–Simpson Hurricane Scale (SSHS) is a scale classifying most Western Hemisphere tropical cyclones that exceed the levels of "tropical depression" and "tropical storm" and thereby become hurricanes. The "categories" it divides hurricanes into are distinguished by the intensities of their respective 1-minute sustained wind speeds.
Category 3: Winds 111-130 mph. Extensive damage to roofing, siding, and windows. Major damage to mobile homes. Major damage to mobile homes. Inland flooding possible.
The Saffir-Simpson Hurricane Wind Scale is a 1 to 5 rating based only on a hurricane's maximum sustained wind speed.Here's how it breaks down.
A fast-moving Hurricane Hazel brought sustained winds of 77 mph (124 km/h) and wind gusts up to 90 mph (140 km/h). [11] The remnants of Hurricane Audrey brought 80 mph winds across southern Canada. [12] A weather station on Nova Scotia recorded 100 mph sustained winds when Hurricane Juan made landfall in 2003.
Category 1 hurricanes range from 74 to 95 mph and can bring very dangerous winds that can damage even sturdy houses. Category 1 is the weakest hurricane, and the storms strengthen up the scale from there. If a hurricane is Category 3 or higher, it is considered a major hurricane. Category 3 hurricanes start with maximum sustained winds of 111 ...
Editor's note: Read USA TODAY's coverage of Helene's landfall and impacts for Friday, Sept. 27.. As monster storms like Helene approach the U.S., meteorologists use five categories to help signal ...