Record-Breaking Polar Air Plunge to Bring October-like Weather to Central and Eastern US
A major cold air outbreak, driven by a southward-dipping jet stream, is poised to deliver a surprising early taste of autumn to the central and eastern United States. This significant weather shift is expected to affect roughly three-quarters of the population east of the Rocky Mountains, with temperatures plummeting to levels more typical of mid- to late October.
Beginning this week, a powerful surge of polar air will sweep across the nation. According to AccuWeather, Daytime highs will be 10–20 degrees Fahrenheit below historical averages, and in some cloudy or rainy areas, the drop could be as much as 30 degrees. In the northern Midwest and higher elevations of the Appalachians, highs may not even break into the 40s.
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Moving south, the central Plains and Ohio Valley can expect highs in the 50s and 60s, while even the southern Plains and Gulf Coast will feel the change with highs in the 70s and low 80s, accompanied by noticeably lower humidity.
Overnight lows will be even more dramatic. Parts of the Midwest and interior Northeast will see temperatures fall into the 30s and 40s, a stark contrast to recent late-summer warmth. The southern Plains and interior Southeast will also experience a significant chill, with some nights dipping into the 40s and 50s.
The cause of this widespread cooling is a large buckle in the jet stream, which is allowing frigid arctic air to push deep into the U.S. This isn’t a typical midwinter event, so instead of snow and sub-zero temperatures, the pattern will produce chilly showers and small hail-like pellets called graupel.
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The clash between this incoming cold air and the still-warm Great Lakes waters is creating conditions ripe for a rare phenomenon: waterspouts.
These spinning columns of air and mist are expected to form, posing a hazard to small boats and creating choppy, gusty conditions on the lakes. While a widespread frost or freeze is unlikely due to wind and cloud cover, isolated pockets of frost are possible in calm, clear-sky areas.
By next weekend, the jet stream is expected to lift north again, bringing a return to more seasonal, summer-like temperatures for many areas with highs back in the 80s.
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