The opening days of November have been slightly below normal in temperature. While daily highs have averaged 3.8 degrees below normal, lows have been relatively mild, averaging 3.2 degrees above normal. On Tuesday, deepening low pressure in the vicinity of lake Huron is forecast to become a pattern changing system, placing much of the central and eastern U.S. in a northwest air flow. In response, temperatures are forecast to plunge in coming days. Monday afternoon, readings across the Canadian prairies held in the teens. It is this reservoir of polar air that will be tapped, as several cold fronts pass across the Great lakes through the upcoming weekend. Forecasts suggest temperatures across our area will average 12 to 16 degrees below normal during the period from Friday through Tuesday. This translates to a chill more typical of mid-December. No significant snowfall is expected during this cold snap, but the area may get a dusting Thursday night into Friday.
Cold temperatures to persist into next week

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Mild pattern to dominate the rest of December
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Cold eases for Black Friday, but wintery weather is to return
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Chilliest temps of the season could bring first flurries
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Dangerous cold grips Chicago, prompting warnings, closings
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Life-threatening cold heads toward Chicago; many schools, businesses to close Wednesday
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Surge of intense cold to last through midweek
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Mayor gives update as historic cold envelops Chicago area causing school closures, flight and train service cancellations
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November cold spell has entered its third week
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Wintry temperatures to return on gusty winds
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Wind Chill Advisory until 6 p.m. today, then extremely dangerous Wind Chill Warning tonight until Thursday
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Midweek warming due to follow frigid Tuesday
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Wintry air to return after springlike Monday
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Canceled flights, delayed trains and icy roads as winter storm moves east