The warm-up can be attributed in large part to the jet stream. The jet stream is a strong current of air high up in the atmosphere. It does a great job of separating colder, polar air from warmer, tropical air. This week, the jet has been south of the Stateline. That means we've been under the influence of cooler, more comfortable air.
Starting this weekend, though, the jet will start shifting north. Most of the country will be talking much warmer temperatures by the beginning of next week.
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