Blame air currents for the East Coast’s warm spell, and also climate change

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The US East Coast has been unusually hot this week, breaking temperature records from Boston to Washington, DC. But what’s causing this sudden warm spell?

The answer has to do with the air currents in the atmosphere, according to Mark Chenard, a meteorologist at the Weather Prediction Center in College Mark, Maryland. Most of the time, winds in the atmosphere flow from west to east; this is called “zonal flow” and it’s responsible for our everyday weather. But every once in a while, the winds start flowing north to south, creating a pattern called “amplified flow.”

“Cold air from north comes down south, and warm air from the south goes north,” he says. So, warm air from the Gulf of Mexico is floating upward toward those of us in the…

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