04 Jan '18, 3pm

'Polar Vortex,' 'Winter Storm Grayson' and 'Bombogenesis': What Do They Mean?

Forecasters are trotting out "polar vortex " and atypical terms like "Nor'easter bomb " and "bombogenesis ." These words signal the unusual and dangerous conditions forecast for winter storm Grayson and their implications for the southeast U.S., mid-Atlantic, and eventually New England and beyond. What do they mean? Meteorologists use the phrase bombogenesis to describe a sudden and extreme drop in barometric pressure of at least 24 millibars over 24 hours, which leads to rapid intensification of a mid-latitude cyclone. We are used to hearing about North Atlantic cyclones during summer and fall—it's the meteorological term for hurricanes —and now winter storm Grayson is drawing moisture from a similar cyclonic circulation that will bring blizzard conditions as it moves northeast just offshore of the U.S. east coast . Winter weather and global warming With cold temperatures...

Full article: https://www.ecowatch.com/polar-vortex-climate-change-2522...

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