After warmth builds over the Plains this week, a storm bringing cooler air and drenching showers and thunderstorms will move across the Rockies and into the Plains late in the week. This setup will lead to severe weather, AccuWeather meteorologists say.

Warmer air is returning after a recent push of Canadian air lowered humidity levels across much of the central and eastern United States. Highs in the northern portion of the Plains that were in the 60s and 70s F are being replaced with highs in the 80s to near 90.

The return of warmer air is only one factor in the severe weather setup.

The storm moving in from the Pacific into the western U.S. will be accompanied by a strong jet stream from Friday into Saturday, which will provide thunderstorms with added energy, raising the risk of dam

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