What Is Bombogenesis and How Does a 'Bomb Cyclone' Become So Dangerous?

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The storm is expected to bring as much as 6 inches of snow to the region.

Schools in the south-east called off classes just months after being shut down because of hurricane threats, and police urged drivers to stay off the roads in a region little accustomed to the kind of winter woes common to the north-east.

"Storms that undergo bombogenesis are among the most violent weather systems that affect a broad area", Alex Sosnowski, AccuWeather senior meteorologist, said about this storm.

Forecasters are calling the process causing these low temps in Florida a "Bomb Cyclone" or "Bombogenesis'".

The storm was dropping inches of snow in SC, as well, as it moved up the coast first to the mid-Atlantic and then to New England.

The heaviest snow will be seen in New Brunswick, with the northern areas expected to be about 40 centimetres deep in the white stuff.

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In other parts of the USA, dangerously cold temperatures have been blamed for at least a dozen deaths as well as freezing a water tower in Iowa and halting ferry services in NY. Charleston was forecast to get 2 to 4 inches of snow and ice.

What makes a storm a "bomb" is how fast the atmospheric pressure falls; falling atmospheric pressure is a characteristic of all storms. 5 to 8 inches is predicted for the beaches of DE and Maryland, with as much as a foot possible, depending on the storm's path. However, if the storm heads east and out into seas, the amount of snow will decrease and wind speeds will die down.

If a description like "bomb cyclone" is not enough to freak you out about this week's winter weather, Winter Storm Grayson has brought along another terrifying weather phenomenon: thundersnow. It will be massive - fill up entire Western Atlantic off U.S. East Coast. Damaging winds/power outage risk a big concern across eastern MA/RI w/bitterly cold air Fri/Sat.

A brutal winter storm has dumped snow, sleet and freezing rain up the south-east seaboard of the United States, delivering snowy conditions some cities had not seen in decades. Notice the tight pressure gradient on this thing tomorrow, indicative of a strong system with hurricane-force winds. Mid-Atlantic and Northeast cities are going to set records for cold temperatures on January 5, with single-digits (and subzero cold) freezing New England on January 6.

A similar effect was occurring Wednesday, as warm air over the ocean met extremely cold polar air that had descended over the East. Pressure was expected to fall quickly from Florida northward.

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