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This is due to increasing Coriolis force closer to the poles, and which is zero at the equator. [ 2 ] [ 3 ] [ 4 ] One associated phenomenon often seen with low-latitude cyclones is the equatorial westerly wind burst , which allows for sufficient shear vorticity on both sides of the equator to support tropical cyclogenesis. [ 5 ]
This was the first hurricane ever reported in the Atlantic, south of the equator. September 7–9, 2004 – Hurricane Ivan parallels the north coast of Venezuela as a Category 4 hurricane. Ivan's strong winds forced the closure of several airports. The hurricane also produced heavy rainfall and strong waves. [37]
At the 22nd hurricane committee in 2000, it was decided that any tropical cyclone that moved from the Atlantic to the Eastern Pacific basin and vice versa would no longer be renamed, [58] provided it remained a tropical cyclone (depression, storm, or hurricane) for its entire crossing of the land mass between the basins.
A developing cyclone is given a name when it officially becomes a tropical storm, meaning it has sustained winds of at least 39 mph. Once maximum sustained winds reach 74 mph, the tropical storm ...
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’s forecast map Thursday showed five separate lemon-yellow circles for potential storm formation. But none of those storms listed a development potential over 30% ...
High shear explains why no cyclones can form in the Red Sea, which possesses the necessary depth, vorticity and surface temperatures year-round. Rarely do tropical cyclones that form elsewhere in this basin affect the Arabian Peninsula or Somalia ; however, Cyclone Gonu caused heavy damage in Oman on the peninsula in 2007.
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 ...