Hurricane Dorian lashes Carolinas after Bahamas havoc

Hurricane Dorian, which reduced much of the northern Bahamas to rubble and left at least 20 people dead, whipped the Carolinas Thursday, bringing lashing winds, heavy rainfall and the threat of dangerous storm surge to the ...

Hurricane Dorian pummels Bahamas with Category 5 assault

Hurricane Dorian hovered over the Bahamas on Monday, pummeling the islands with a fearsome Category 5 assault that shredded roofs, hurled cars and forced even rescue crews to take shelter until the onslaught passes.

Data assimilation method offers improved hurricane forecasting

Operational models for severe weather forecasting predicted Hurricane Harvey would become a Category 1 hurricane in 2017, according to the University Corporation for Atmospheric Research. Instead, it became a massive Category ...

Tropical Storm Humberto targets hurricane-hit Bahamas

The devastated northern Bahama islands were facing a fresh tropical storm on Saturday, potentially complicating desperately needed relief efforts to the shattered archipelago in the wake of Hurricane Dorian.

Dorian's floodwaters trap people in attics in North Carolina

A weakened Hurricane Dorian flooded homes on North Carolina's Outer Banks on Friday with a ferocity that took even storm-hardened residents by surprise, forcing people to retreat to their attics. Hundreds were feared trapped ...

N. Carolina faces 'long night' as Dorian's Bahamas toll rises

North Carolina braced for a "long night" of strong winds and driving rain as Hurricane Dorian moved near the US state's coast Friday after devastating the northern Bahamas, where it left at least 30 people dead and thousands ...

page 1 from 6

Tropical cyclone

A tropical cyclone is a storm system characterized by a large low-pressure center and numerous thunderstorms that produce strong winds and heavy rain. Tropical cyclones feed on heat released when moist air rises, resulting in condensation of water vapor contained in the moist air. They are fueled by a different heat mechanism than other cyclonic windstorms such as nor'easters, European windstorms, and polar lows, leading to their classification as "warm core" storm systems. Tropical cyclones originate in the doldrums near the equator, about 10° away from it.

The term "tropical" refers to both the geographic origin of these systems, which form almost exclusively in tropical regions of the globe, and their formation in maritime tropical air masses. The term "cyclone" refers to such storms' cyclonic nature, with counterclockwise rotation in the Northern Hemisphere and clockwise rotation in the Southern Hemisphere. Depending on its location and strength, a tropical cyclone is referred to by names such as hurricane, typhoon, tropical storm, cyclonic storm, tropical depression, and simply cyclone.

While tropical cyclones can produce extremely powerful winds and torrential rain, they are also able to produce high waves and damaging storm surge as well as spawning tornadoes. They develop over large bodies of warm water, and lose their strength if they move over land. This is why coastal regions can receive significant damage from a tropical cyclone, while inland regions are relatively safe from receiving strong winds. Heavy rains, however, can produce significant flooding inland, and storm surges can produce extensive coastal flooding up to 40 kilometres (25 mi) from the coastline. Although their effects on human populations can be devastating, tropical cyclones can also relieve drought conditions. They also carry heat and energy away from the tropics and transport it toward temperate latitudes, which makes them an important part of the global atmospheric circulation mechanism. As a result, tropical cyclones help to maintain equilibrium in the Earth's troposphere, and to maintain a relatively stable and warm temperature worldwide.

Many tropical cyclones develop when the atmospheric conditions around a weak disturbance in the atmosphere are favorable. The background environment is modulated by climatological cycles and patterns such as the Madden-Julian oscillation, El Niño-Southern Oscillation, and the Atlantic Multi-Decadal Mode. Others form when other types of cyclones acquire tropical characteristics. Tropical systems are then moved by steering winds in the troposphere; if the conditions remain favorable, the tropical disturbance intensifies, and can even develop an eye. On the other end of the spectrum, if the conditions around the system deteriorate or the tropical cyclone makes landfall, the system weakens and eventually dissipates. It is not possible to artificially induce the dissipation of these systems with current technology.

This text uses material from Wikipedia, licensed under CC BY-SA