The Earth's polar vortex is revving up, bringing the first hints at changing weather as fall descends on the U.S.

The movement means gradual cooling and a more active storm track across the northern U.S. — but not everyone will feel the chill right away. In Michigan, yet another dry, warm spell is underway this week with highs reaching 80 degrees, according to the National Weather forecast. \

For residents tired of this "mini" summer, cooler temperatures are around the corner.

" Quiet and dry weather will persist through midweek ; however, there will be more cloud cover," posted the NWS in Marquette on X on Sept. 30. "Meanwhile, today will be cooler than yesterday, but still above normal. Temperatures rise again later in the week."

On average, cities in the Lower Peninsula see thei

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