Our current jet stream configuration is so straight you could trace it with a ruler.

Sure you’ve heard of the jet stream, the narrow bands of stronger winds that circulate high above the ground.

There’s usually not a singular jet stream but several that dip and rise, producing multiple changes in latitude and altitude. This feature becomes more pronounced in winter as temperature gradients grow. The wonky winter jet stream is a classic prerequisite for active weather and was the primary driver of the historic December storm across North America.

But what happens when you completely straighten out this robust air current?

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Most of the continent is facing an absence of active weather and strong storms. Instead, there’s a prolific influx of mild air, compliments of the jet stream.

Read more: The Weather Network