A fall preview is coming for most of the central and eastern United States as cool air from Canada spreads to the south and east in the days ahead, AccuWeather meteorologists say.

The shift will help reduce energy demand as fewer households will need air conditioning, and many people may opt for jackets or long sleeves during the evening and overnight hours. The cooler pattern will also create more favorable conditions for outdoor work, sports camps and other strenuous activities.

A large southward dip in the jet stream will align with a high-pressure system moving out of Canada and spreading across the central and eastern U.S. into next week, reaching around two dozen states.

Residents who open windows for fresh air during the day may need to close them at night, as temperatures will a

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