What creates such dramatic storms across the US Great Plains? The key factors are topography and temperature differences.
What raises a common winter storm to the level of 'bomb cyclone'? It's all about rapid, sharp changes in atmospheric pressure – and the scientists who coined the term meant to highlight their power.
An atmospheric scientist who studies the Arctic explains why – because of global warming – the U.S. may be in for longer cold spells in the winter.
The US was hit by a 'bomb cyclone' last week, bringing icy cold and driving snow. These storms develop very rapidly, forming outside the tropics, typically on continental east coasts in winter.