Early season arctic blast to follow first measurable snowfall

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Wednesday was the first 100% sunny day here since Oct 12; mild temperatures to hold into early next week—except for an interruption Friday—jet stream shifts in from the North Pole by Tuesday bringing an arctic blast—snow on front end?
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Shortest time span between seasonal snows
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Winter Weather Advisory issued across Chicago area, snow expected overnight
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Sticking snow could arrive ahead of bitter blast of cold next week
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Fresh snowpack & frigid arctic flow sets stage for Chicago’s coldest early season high on the books & the record coldest Nov 12 max temp; predicted pattern change to bring temps back to levels closer to normal next week
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Jet stream out of the arctic “locked in” through next week; current chill to be followed by a new, near record early season cold surge Sunday night into much of next week; wind, waves & high lake levels prompt Thursday’s “lakeshore flood advisory”
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Does early-season snow portend an extra-snowy winter?
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No trick, or treat: Winter Weather Advisory issued across Chicago area this Halloween
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Burst of mild Pacific air Saturday—then “N” winds strengthen Sunday p.m.; arctic blast is next Sunday night into next week—fall 2019’s coldest yet; sticking snow a threat as it arrives Sunday night/Monday morning
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Cold air moves in overnight and frigid wind chills early next week
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Disturbance brushes the area Saturday with some clouds— milder Pacific air & 40s Sunday; 2 Thanksgiving week storms ahead—one Tuesday PM; a 2nd next weekend; arctic chill follows
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Stellar fall week to turn stormy, then cold
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Early blast of winter hits Chicago with record-breaking cold