The month of December has gotten off to a cold start across much of the eastern half of the nation and there will be multiple cold air outbreaks in coming days. Two signals that have foreshadowed a cold period include an unusually early season stratospheric warming event and the movement of a tropical disturbance into a position that favors colder-than-normal weather across much of the nation. In fact, there appears to be a second burst of stratospheric warming in the offing for later this month resulting in a “stretched” polar vortex, and the tropical disturbance will likely persist in much of the same “cold” position” for awhile longer...both of these favor the idea of additional cold air outbreaks as we progress through the month.
The cold pattern has been quite active as well and multiple systems will have to be watched in coming days. On Friday, low pressure will develop over the Deep South and head in an northeasterly direction. This system is likely to produce some accumulating snow in the southern half of the Mid-Atlantic region and looks like a light-to-moderate snow event. Another low pressure system may pull out of the southeastern states by early next week and head in an northeasterly direction at the same time a “clipper” moves southeastward across the Great Lakes…we’ll monitor this activity as it could result in some accumulating snow for the northern Mid-Atlantic and Northeast US. Later next week, it appears a couple of other “clipper” systems will drop southeastward from southwestern Canada into the Great Lakes and ultimately, to the Northeast US. Finally, the significant change in recent days of an index value known as the “Southern Oscillation” is raising a red flag that the chance of an east coast storm will be on the rise somewhere down the road as the sub-tropical jet stream likely becomes activated.
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High pressure takes control of the weather for the mid-week and then a strong cold frontal passage will take place here by tomorrow night and it will usher in the coldest air so far this season. As a result, temperatures are likely to bottom out near 20 degrees across most suburban locations by early Friday morning and highs later in the day will be confined to the middle 30’s with an increase in cloud cover. Low pressure will close in on the area from the south later in the day on Friday and it could produce some accumulating snow in portions of the Mid-Atlantic region; especially, to the south of the PA/MD border.
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High pressure takes control of the weather for the mid-week and then a strong cold frontal passage will take place here by tomorrow night and it will usher in the coldest air so far this season. As a result, temperatures are likely to bottom out in the upper teens across most suburban locations by early Friday morning and highs later in the day will be confined to the lower 30’s with an increase in cloud cover. Low pressure will close in on the area from the south later in the day on Friday and it could produce some accumulating snow in portions of the Mid-Atlantic region; especially, to the south of the PA/MD border.
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High pressure takes control of the weather for the mid-week and then a strong cold frontal passage will take place here by tomorrow night and it will usher in the coldest air so far this season. As a result, temperatures are likely to bottom out in the middle teens across most suburban locations by early Friday morning and highs later in the day will be confined to the low-to-mid 30’s with an increase in cloud cover. Low pressure will close in on the area from the south later in the day on Friday and it could produce some accumulating snow in portions of the Mid-Atlantic region; especially, to the south of the PA/MD border.
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Skies will be partly sunny today across the region and temperatures will be on the chilly side. The weather turns wintry by late tonight with the chance of snow and periods of snow are likely on Wednesday and travel impacts are likely at mid-week.
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Low pressure will head to a position off the Mid-Atlantic coastline by later today at the same high pressure to our north retreats into the northwestern Atlantic. It’ll be cold enough for awhile this morning for a mix of sleet and rain to fall across some suburban locations, but the influx of slightly milder ocean air later today will cause a transition to plain rain throughout the area…watch for AM slick spots on some of the suburban roadways.
High pressure takes control of the weather for the mid-week and then a cold frontal passage on Thursday night will usher in the coldest air so far this season. As a result, temperatures are likely to bottom out in the upper teens across most suburban locations by early Friday morning. After that, we’ll have to monitor the movement of low pressure across the southeastern states. There is a chance that this system pushes far enough to the north by Friday night/ Saturday to produce some snow in the Mid-Atlantic region...we’ll closely monitor this threat during the next few days.
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Chilly weather continues across the Tennessee Valley with today’s temperatures doing no better than the lower 40’s for afternoon highs. The night will be quite cold with mainly clear skies and there is the chance for some late night “freezing” fog which could cause some slick spots on roadways. Milder conditions are likely at mid-week with afternoon highs on Wednesday around the 50-degree mark.
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Low pressure will head to a position off the Mid-Atlantic coastline by later today at the same high pressure to our north retreats into the northwestern Atlantic. It’ll be cold enough for awhile this morning for snow, sleet and freezing rain to fall across many suburban locations, but the influx of slightly milder ocean air later today will cause a transition to plain rain throughout the area. Accumulations are possible before the changeover on the order of a coating in the metro region to an inch or two in some of the northern and western suburban locations…watch for AM slick spots on the roadways.
High pressure takes control of the weather for the mid-week and then a cold frontal passage on Thursday night will usher in the coldest air so far this season. As a result, temperatures are likely to bottom out in the upper teens across most suburban locations by early Friday morning. After that, we’ll have to monitor the movement of low pressure across the southeastern states. There is a chance that this system pushes far enough to the north by Friday night/ Saturday to produce some snow in the Mid-Atlantic region...we’ll closely monitor this threat during the next few days.
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Low pressure will head to a position off the Mid-Atlantic coastline by later today at the same high pressure to our north retreats into the northwestern Atlantic. It’ll be cold enough for awhile longer this morning for mixed precipitation across some suburban locations, but the influx of slightly milder ocean air will cause a transition to plain rain throughout the area by the late morning/mid-day hours…watch for slick spots on some suburban roadways during the morning hours.
High pressure takes control of the weather for the mid-week and then a cold frontal passage on Thursday night will usher in the coldest air so far this season. As a result, temperatures are likely to bottom out near 20 degrees across most suburban locations by early Friday morning. After that, we’ll have to monitor the movement of low pressure across the southeastern states. There is a chance that this system pushes far enough to the north by Friday night/ Saturday to produce some snow in the Mid-Atlantic region...we’ll closely monitor this threat during the next few days.
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December has begun on a cold note across the northeastern states and below-normal temperatures are likely on average through at least the first half of the month. Two factors that have been pointing us to an extended cold stretch this month include an unusually early stratospheric warming event over the polar region of the Northern Hemisphere, and the movement of a tropical disturbance along the equator that is moving through locations which favor colder-than-normal weather in the eastern states.
The cold pattern will remain active as well with the next storm system to impact the Mid-Atlantic and Northeast US on Tuesday, and this follows a significant Great Lakes snow event late last week and a major snowstorm in the Midwest this past weekend. The best chance for significant snow on Tuesday will be across the interior sections of the northeastern states where several inches of snow are likely and heavy rain is the main threat along coastal areas from southern New Jersey to the Delmarva Peninsula. The I-95 corridor will be in the “battle zone” region for awhile on Tuesday morning with snow and ice likely at the front end that will transition to plain rain for the main part of the storm. Small snow accumulations are possible before the transition to plain rain with a coating to an inch or so possible in some of the northern and western suburbs...watch for slick spots during the AM hours.
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