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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]
A tropical cyclone tracking chart is used by those within hurricane-threatened areas to track tropical cyclones worldwide. In the north Atlantic basin, they are known as hurricane tracking charts . New tropical cyclone information is available at least every six hours in the Northern Hemisphere and at least every twelve hours in the Southern ...
In most tropical cyclone basins, use of the satellite-based Dvorak technique is the primary method used to estimate a tropical cyclone's maximum sustained winds. [5] The extent of spiral banding and difference in temperature between the eye and eyewall is used within the technique to assign a maximum sustained wind and pressure. [6]
The highest storm surge is normally coincident with the radius of maximum wind. Because the strongest winds within a tropical cyclone lie at the RMW, this is the region of a tropical cyclone which generates the dominant waves near the storm, and ultimately ocean swell away from the cyclone. [12]
Common developmental patterns seen during tropical cyclone development, and their Dvorak-assigned intensities. The Dvorak technique (developed between 1969 and 1984 by Vernon Dvorak) is a widely used system to estimate tropical cyclone intensity (which includes tropical depression, tropical storm, and hurricane/typhoon/intense tropical cyclone intensities) based solely on visible and infrared ...
Several recorded Category 5 hurricanes reached that intensity multiple times during their lifetime. Hurricanes Allen in 1980, Isabel in 2003 and Ivan in 2004 each soared to Category 5 intensity ...
September 26, 1937: The extratropical remnant of a hurricane caused damage in Nova Scotia. The storm was moving swiftly, so most of the damage was strictly wind related. September 21, 1938: The 1938 New England hurricane tracked into Canada, bringing strong winds to eastern Ontario and southern Quebec. Damage was primarily limited to trees and ...
A cyclone barrelling towards southeast Africa for the last four days caused widespread devastation in Mayotte after it struck the French oversea region as the most powerful storm in 90 years ...