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A tropical cyclone is the generic term for a warm-cored, non-frontal synoptic-scale low-pressure system over tropical or subtropical waters around the world. [4] [5] The systems generally have a well-defined center which is surrounded by deep atmospheric convection and a closed wind circulation at the surface. [4]
The National Hurricane Center is responsible for the region east of 140°W, while the Central Pacific Hurricane Center is responsible for storms forming west of 140°W to the International Date Line. Atlantic hurricane – a tropical cyclone that forms in the Atlantic Ocean. The National Hurricane Center is responsible for the region.
English: Diagram of a hurricane. ... Tropical Cyclone Structure (in en). ... This W3C-invalid diagram was created with Inkscape ...
The structure of Hurricane Rita as seen by ELDORA radar. Most hurricanes exhibit a definitive eyewall and spiral rain bands outside of the eye. These spiral rain bands were known to be complex structures that possess deep convective cores enmeshed in low altitude precipitative clouds.
Cross section of a mature tropical cyclone. A typical tropical cyclone has an eye approximately 30–65 km (20–40 mi) across at the geometric center of the storm. The eye may be clear or have spotty low clouds (a clear eye), it may be filled with low-and mid-level clouds (a filled eye), or it may be obscured by the central dense overcast.
Hurricane Catarina, a rare South Atlantic tropical cyclone viewed from the International Space Station on March 26, 2004 The term "tropical" refers to both the geographic origin of these systems, which form almost exclusively in tropical regions of the globe, [ 46 ] and their dependence on Maritime Tropical air masses for their formation.
Some rainbands move closer to the center, forming a secondary, or outer, eyewall within intense hurricanes. [15] Spiral rainbands are such a basic structure to a tropical cyclone that in most tropical cyclone basins, use of the satellite-based Dvorak technique is the primary method used to determine a tropical cyclone's maximum sustained winds ...
The hurricane season runs between May 15 and November 30 each year, and encompasses the vast majority of tropical cyclone activity in the region. [12] In the 1971–2005 period, there were an average of 15–16 tropical storms, 9 hurricanes, and 4–5 major hurricanes (storms of Category 3 intensity or greater) annually in the basin. [12]