DECRYPTION – This well-known weather phenomenon is reinforced by the geography of the North American continent, which opposes no obstacle to the polar air.
The freezing temperatures and heavy snowfall that hit the United States was caused by an encounter with a low pressure system, called a “bomb” by meteorologists, because it deepened very quickly to the northeast. of the United States, and of an anticyclone, also very powerful, located in the north of Canada. “As they approached each other, these two masses rotating in an opposite direction created a gear which caused the expulsion of a huge bubble of polar air towards the south.explains Tristan Amm, forecaster at Météo-France. This cold descended to the center of the United States, and even overflowed into Louisiana, where frosts were recorded. This well-known weather phenomenon is reinforced by the geography of the North American continent, which opposes no obstacle to the polar air. In Europe, the bubble would have been heated during its crossing of the Atlantic Ocean and the North Seas.
If it is spectacular and very rare, the episode is not extraordinary in a…
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