Cool air and fall-like temperatures are expected to impact millions of Americans this week.
The below-average temperatures are being caused by an intense dip in the polar jet stream, and a cold front associated with that dip.
Forecasts suggest it is likely that dozens of places will set record-cold temperatures on Thursday and Friday afternoon.
Temperatures may start to rebound by next week as the jet stream breaks down and allows for summer-like conditions to return.
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