A very cold air mass has plunged into the central and eastern US and our temperatures today will be well below-normal for this time of year. The worst of the cold will be in the Upper Midwest where all-time record lows may be set in places like Chicago, Illinois. There is much milder air headed our way for the weekend, but it will come with an increased chance of showers.
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Extreme cold is headed into the north-central US over the next 24 hours and it will spread to the east coast at mid-week. A strong cold front has already passed through our region and today will be much colder than Monday with some lingering snow possible across the area. Skies should clear tonight and temperatures will plunge to the 20 degree mark in many spots for overnight lows. It stays quite chilly over the next couple of days, but considerably milder weather is going to return to the Tennessee Valley by the weekend.
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*Extreme cold is headed to the north-central US – potentially historic for places like Chicago - and it will spread to the east coast by mid-week*. A large scale trough will form in the eastern US over the next couple of days and it’ll lead to chilly weather around here. A strong cold front will pass through the region later tonight and Tuesday as low pressure slides through the Great Lakes. Rain is likely to change to accumulating snow toward daybreak and continue into early Tuesday with possible accumulations of 1-3 inches. Highs for much of the rest of the week should be way below normal for the Tennessee Valley and much of the central and eastern US.
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Cold air remains in control around here for another day as temperatures likely hold in the 30’s for highs despite some sunshine. A warming trend will begin on Saturday and likely early next week with highs back in the 50’s on Sunday and Monday, but another cold front arrives by mid-week. That cold front may usher in much colder air for the middle of next week in the Tennessee Valley and the Upper Midwest/Great Lakes are likely to experience brutally cold conditions.
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All signs point to the invasion of a brutally cold air mass into the central US next week that will make its way to the east coast around mid-week. This upcoming Arctic air outbreak looks quite similar to the air mass that impacted the central and eastern US during January 1985 which followed a major stratospheric warming event - much like what we have just experienced over the past several weeks. This kind of air mass has the potential of becoming quite a news making event for the Upper Midwest/Great Lakes/Northern Plains and could result in actual air temperatures as severe as 25 degrees below zero in Chicago – awfully close to the all-time low of -27°F set in January 1985.
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Another widespread cold air mass will impact the Tennessee Valley over the next few days as high pressure builds to the southeast from Canada. Highs today will struggle to reach the mid 40’s and there will be a noticeable wind chill caused by 10-15 mph NW winds. As the high pressure edges closer to the region, the cold blast will become even more noticeable as temperatures tonight will drop way down into the 20’s and struggle to reach the mid 30’s on Friday – normal high is now around 52 degrees.
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Despite the fact that it’ll turn unseasonably mild later tonight and early Thursday in much of the eastern US, the overall cold weather pattern shows no signs of slowing down. There will be another outbreak of cold air in the eastern US for the Thursday night/Friday/Saturday time period, but the coldest core of that air mass (relative-to-normal) will be centered over south-central and southeastern Canada. Next week, however, it looks like a brutally cold air mass will plunge southward right into the central US and eventually make its way to the east coast - and the coldest temperatures relative-to-normal will be in the US.
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There will be occasional showers today ahead of an approaching cold frontal system and an outside chance at a thunderstorm. Colder air arrives tonight following the passage of the cold front and skies should clear for Thursday and Friday as high pressure builds back into the region.
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After a very cold day to start the week, it’ll turn milder ahead of the next low pressure system and the winds will pick up in intensity out of the southeast. Showers are likely by early tonight and the threat will continue through mid-week. Colder air will follow for the latter part of the week and snow showers will be possible each day as we head towards the weekend.
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Very cold air poured into the eastern US this weekend and we’ll start the week on a cold note in the Tennessee Valley. It’ll stay rain-free for today and at least the first part of tomorrow, but a storm will be intensifying as it moves eastward from the middle part of the nation. Rain is likely to push into the local region by mid-week and there could be a decent amount as this system has quite a bit of upper-level support.
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