December so far has been well above normal in the I-95 corridor and indeed it may go down as one of the warmest Decembers ever in this region; however, there will be a very noticeable change to cold for the next three days. Temperatures today, tomorrow and Sunday will actually be colder-than-normal for this time of year with Saturday the coldest day of the three. Once high pressure pushes off the coast early next week, temperatures will climb and perhaps reach record high levels again by the time the middle of next week rolls around.
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A strong cold front will arrive in the region today and low pressure will form along the frontal boundary zone generating periods of rain around here and some of it will be heavy at times. Much colder air will flood into the Northeast US following the cold frontal passage for the Friday/Saturday/Sunday time period. This weekend will also feature the first serious outbreak of “lake effect” snow in those areas just downstream from the Great Lakes given the expected temperature difference between the cold air mass flowing over the still relatively warm water temperatures. This cold shot will be only temporary, however. Once high pressure pushes off the east coast early next week, the floodgates will open once again for much milder air to push northward into the Northeast US. In fact, record warmth is likely in many areas east of the Mississippi River by the middle of next week and the warmth should continue right through Christmas Day.
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A strong cold front will approach the region on Thursday and periods of rain will be the result as low pressure forms along the frontal boundary zone. Much colder air will flood into the Northeast US following the cold frontal passage for the Friday/Saturday/Sunday time period. This weekend will also feature the first serious outbreak of “lake effect” snows in those typical snow-prone areas just downstream from the Great Lakes given the expected temperature difference between the cold air mass flowing over the still relatively warm water. This cold shot will be only temporary, however. Once high pressure pushes off the east coast early next week, the floodgates will open once again for much milder air to push northward into the Northeast US. In fact, record warmth is likely in many areas east of the Mississippi River by the middle of next week and it should remain quite warm - perhaps even record breaking - for Christmas Day.
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A weak cold frontal system crossed the region overnight and it’ll turn out somewhat cooler today than yesterday, but temperatures will remain above normal for this time of year. Weak high pressure will push in for the next couple of days before a much stronger cold front approaches on Thursday. Additional rain will accompany the next front on Thursday and much colder air will follow for the end of the week and upcoming weekend. This next cold shot will not last too long, however, as much milder air will make a return for the bulk of Christmas week.
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After our unusually warm mid-December weekend, it’ll stay mild today ahead of an approaching cool front, but showers are likely later today and tonight as a cooler air mass pushes towards the east coast High pressure will return on Tuesday and control the weather through mid-week with cooler conditions, but still warmer-than-normal for this time of year. A much colder air mass is destined to arrive at the end of the week and the upcoming weekend will be far different than the one just passed; however, it turns much warmer again during Christmas week.
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Strong El Nino in the tropical Pacific Ocean is nearing its peak intensity and it is contributing to a spike in global temperatures. We'll get in on a piece of that action this weekend as record warmth heads into the Mid-Atlantic region with high temperatures on both days way up in the 60’s. In fact, it is not out of the question that a few spots reach the 70 degree mark this weekend along the I-95 corridor. The records for Saturday/Sunday are as follows: NYC 68 (1931)/64 (1923), PHL 65 (1931)/65 (1923), DCA 71 (1873)/71 (1889).
It’ll stay mild on Monday, but a cool front is likely to generate periods of rain; primarily, during the PM hours. Cooler air pushes into the region by Tuesday, but it should remain warmer-than-normal for this time of year during the mid-week time period. Looking beyond that, much colder weather is likely to reach the I-95 corridor by next weekend.
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Near-record warmth is headed to the Mid-Atlantic region for the upcoming mid-December weekend. A warm front will cross the region later tomorrow and its passage will usher in very mild air for this time of year for both weekend days. It’ll stay mild on Monday and there is the threat for some shower activity, and then cooler air should return on Tuesday.
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A weak area of low pressure will cross the region later today and tonight and it is likely to generate patchy clouds and a late night shower cannot be ruled out. High pressure builds back into the area during the late week and it’ll turn milder as we approach the weekend. In fact, the 60’s are likely each day this weekend for high temperatures and it should stay rain free.
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A weak cold front passed through the region yesterday and it’ll be a bit colder today, however, the rest of the week looks quiet and relatively mild for this time of year. In fact, the late week and weekend will feature mild conditions with temperatures first approaching and then even surpassing the 60 degree mark for highs in the DC metro region. Longer term, there are signs that a colder weather pattern will arrive in the Mid-Atlantic region as we progress through the second half of the month.
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All in all, it looks like our recent quiet and relatively mild weather pattern will continue right through the upcoming week and weekend. A weak cold front will approach the region today and then low pressure will form off the coast in the overnight hours before moving out to sea on Tuesday. Neither of these systems, however, should be strong or close enough to produce any precipitation in the immediate area. High pressure will return by later tomorrow and it’ll stay in control of our weather pattern during the mid-week. It’ll turn milder late in the week and the mild conditions should continue right through the upcoming weekend.
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