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BOMB CYCLONE: DEFINITION, REGIONS AND REASONS

 BOMB CYCLONE: DEFINITION, REGIONS AND REASONS 



The technical term is “bombogenesis,” and it means the central pressure of a storm, a measure of its power, drops by at least 24 millibars in 24 hours. Bomb cyclone is a shortened version of it, better for social media,” said U.S. meteorologist Ryan Maue, who helped popularise polar vortex in 2014.

A storm is considered a “bomb” when the pressure drops rapidly at least 24 millibars in 24 hours. Millibar is the unit of atmospheric air pressure. Bomb cyclones put forecasters on high alert, because they can produce significant harmful impacts. Two famed meteorologists, Fred Sanders and John Gyakum, gave this pattern its name in a 1980 study.

What is bomb Cyclone?



bomb Cyclone is a large, intense midlatitude storm with low pressure at its center, weather fronts, and a variety of associated weather, ranging from blizzards to severe thunderstorms to heavy precipitation. National Weather Service (NWS) confirmed “bomb cyclone” — characterized by the explosive power of rapid drops in atmospheric pressure. Bomb cyclones put forecasters on high alert, because they can produce significant harmful impacts.

In which region does a Bomb Cyclone occur?



New York , boston, Warren, Rhode Island, Florida, eastern North America -- from Georgia to Canada 



How is a Bomb Cyclone formed?



There are many reasons cited for the formation of Bomb Cyclones.The key ingredient of a weather bomb is the collision of cooler air with much warmer air, and that is on hand. A cold front from Canada dropped temperatures to a low of 17° Fahrenheit (-8° Celsius) in New York City’s Central Park overnight while in the Atlantic Ocean, the water is warmer than normal. Cape May in New Jersey recorded a water temperature of 46°F, and in Georges Bank off Massachusetts, the ocean was 44.6°F, according to the National Data Buoy Center. Not exactly balmy, but enough to provide the grist for the bombogenesis mill.

The baroclinic instability is another cause of this as It happens when a midlatitude cyclone rapidly intensifies and drops at least 24 millibars in 24 hours.

Bomb cyclones are caused when a cold air mass collides with a warm air mass, such as air over warm ocean waters.

 Over the warmer ocean, heat and moisture are abundant. But as cool continental air moves overhead and creates a large difference in temperature, the lower atmosphere becomes unstable and buoyant. Air rises, cools and condenses, forming clouds and precipitation.

 

Source- the hindu, scientific America.

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