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By contrast, the U.S. National Weather Service, Central Pacific Hurricane Center and the Joint Typhoon Warning Center define sustained winds as average winds over a period of one minute, measured at the same 33 ft (10.1 m) height, [16] [17] and that is the definition used for this scale.
The scale used for a particular tropical cyclone depends on what basin the system is located in; with for example the Saffir–Simpson hurricane wind scale and the Australian tropical cyclone intensity scales both used in the Western Hemisphere. All of the scales rank tropical cyclones using their maximum sustained winds, which are either ...
Odile had the lowest atmospheric pressure of a Category 4 hurricane in the Pacific basin, east of 180°W, at 918 mbar (hPa; 27.11 inHg). Category 4, the second-highest classification on the Saffir–Simpson scale, [nb 1] is used for tropical cyclones that have winds of 130–156 mph (209–251 km/h; 113–136 kn). The division of the eastern ...
Saffir-Simpson Hurricane Scale – a scale widely used by the National Hurricane Center, Central Pacific Hurricane Center, and the Joint Typhoon Warning Center to determine a storm's strength using maximum sustained winds. Accumulated cyclone energy – a metric used by several agencies to measure the longetivity of a tropical cyclone.
Before the 1–5 scale was created in 1969 by the National Hurricane Center and later by the Bureau of Meteorology in Australia, many tropical cyclones were simply ranked by the Beaufort Wind Scale which was created in the early 1800s by Francis Beaufort. The purpose of the scale was to standardize wind reports in ship logs.
Developed by wind engineer Herb Saffir and meteorologist Bob Simpson, the scale was first published in the 1970s as a way to quantify the threat of a given hurricane and alert the public to ...
Meteorologists are paying attention to this area of low pressure because it is forming over warm waters during hurricane season, which means it could become more powerful.
The hurricane center and the National Weather Service typically advise residents in the path of a storm to plan for one category higher than forecast, and for now Helene is forecast to be a ...