On Friday, a “clipper” low pressure system will drop to the south and east from the Great Lakes region at the same time low pressure starts to form over the western Atlantic Ocean. These two systems may combine to produce rain showers in the region early Friday and then rain and/or snow showers from later Friday into late Friday night. Minor snow accumulations are possible in the DC metro region by late Friday night and up to a couple inches can fall across portions of northeastern Maryland.
As the low pressure system intensifies on Saturday and pulls off to the northeast of here, the coldest air of the season so far will pour into the region for the latter part of the weekend and early part of next week. Temperatures on Sunday will be confined to the 20’s for afternoon highs – the coldest day so far this season - and the overnight lows by early Monday morning could be in the lower teens across many suburban locations.
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The combination of a weakening “clipper” low pressure system and an intensifying ocean low that develops an inverted trough will raise the chance of some accumulating snow from later Friday into early Saturday across the northern Mid-Atlantic region to include eastern PA, New Jersey and New York City. Farther to the south, snow showers are possible in the DC metro region by Friday night, but accumulating snow there is less likely than to the north of the PA/MD border. As the intensifying ocean low pulls away to the northeast on Saturday, the coldest air mass of the season so far will ride into the Mid-Atlantic region on stiff northwest winds and the lowest temperatures in this cold snap are likely to occur early Monday morning.
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Another low pressure system and its associated cold front will bring more rain to the DC metro region from the early-to-mid afternoon to later tonight and a slightly colder air mass will follow for the day on Thursday. On Friday, a “clipper” low pressure system will drop to the south and east from the Great Lakes region at the same time low pressure starts to form over the western Atlantic Ocean. These two systems may “link up” in time to produce rain and/or snow showers on Friday and likely snow showers on Friday night.
As the low pressure system intensifies on Saturday and pulls off to the north and east of here, the coldest air of the season so far will pour into the Mid-Atlantic region for the latter part of the weekend and early part of next week. Temperatures on Sunday will likely be confined to 30 degrees for afternoon highs and the lowest temperatures so far this season should take place late Sunday night/early Monday morning with the lower teens a possibility for overnight lows in some suburban locations.
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There have been many football games played in cold weather over the years at Penn State’s Beaver Stadium, but this one coming up on Saturday will be the first of its kind as an official playoff game under the new format by the NCAA. In fact, the coldest air of the season will pour into the Mid-Atlantic region and Northeast US from this weekend into early next week on the backside of strengthening low pressure over the western Atlantic Ocean. The lowest temperatures in this upcoming cold blast are likely to occur early Monday morning with upper single digits on the table for places like State College, PA, and the lower teens possible in many suburban locations along the DC-to-Philly-to-NYC corridor...pretty impressive readings indeed considering there is no snow cover in the I-95 corridor. Temperatures will turn much milder early next week across the central US and a moderation in temperatures will reach the eastern seaboard by Christmas Day which falls on Wednesday of next week.
As far as snow is concerned, there is the chance for snow shower activity on Friday and Friday night in the Mid-Atlantic region and perhaps even a period of steadier snow. The combination of a “clipper” low pressure system dropping to the south and east from the Great Lakes and developing low pressure over the western Atlantic will bring us the threat of snow. The speed at which these two systems “link up” will dictate how much snow can fall on Friday and Friday…small accumulations are on the table and the situation bears watching during the next few days.
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Clouds, drizzle and patchy fog early today will give way to partial sunshine for the afternoon hours and it’ll become quite mild for this time of year with temperatures reaching 60 degrees in most spots. Another low pressure system and its associated cold front will bring more rain to the Mid-Atlantic region from later tomorrow into early Thursday and a colder air mass will follow for the latter part of the week. Even colder air will push into the region for the upcoming weekend and Sunday is likely to turn out to be the coldest day so far this season.
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An active weather pattern this week with multiple systems to deal with in the Mid-Atlantic region. Weak low pressure will pull away from the area this morning, but it’ll be quickly followed by another system likely to produce more rain around here from later tonight into early Tuesday. Yet another low pressure system should affect our region from later Wednesday into early Thursday bringing more rain to the region. Colder-than-normal air will follow for the late week and the upcoming weekend and it looks like it’ll stay quite cold right into the first part of Christmas week.
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It’ll stay well below-normal today in the Mid-Atlantic region, but the winds will not be a factor as they were on Thursday. An overall active weather pattern is unfolding going forward and there will be a couple systems to deal with early next week. By late Sunday, weak low pressure will bring moisture into the Mid-Atlantic region and it can be cold enough at the onset (cold air damming scenario) for a mix of snow and/or ice across some of the far N/W suburbs. Another system will follow quickly on Monday and Tuesday bringing some rain to the Mid-Atlantic region.
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The month of December has started off with a few Arctic air outbreaks into the central and eastern US and while the overall pattern may turn somewhat milder for part of next week, there are multiple signals pointing to additional cold air outbreaks from later next week into the month of January. In addition, the unfolding weather pattern appears to be quite active with numerous storm systems to deal going through the second half of the month of December.
One of the signals for additional cold air outbreaks revolves around an oceanic-atmospheric phenomenon known as the Madden-Julian Oscillation or MJO. A second centers around a phenomenon that features warming over the polar region in the upper part of the atmosphere known as the stratosphere. Finally, a teleconnection index known as the Pacific-North American (PNA) is likely to feature a positive phase for much of the rest of the month and this generally favors high pressure ridging across the western US and Canada which, in turn, is usually favorable for cold air outbreaks to make their way from northern Canada into the central and eastern US.
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The passage of a strong cold front on Wednesday evening ushered in a much colder air mass and temperatures will remain well below-normal through Friday. Winds will stay quite strong today from a west-to-northwest direction making it feel even colder than the actual ambient temperatures. High pressure will be in charge to be the weekend and temperatures will moderate some and then a couple of low pressure systems will affect the region from Sunday night through Tuesday.
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The combination of an intensifying surface low pressure system, a strong cold front, and a deepening upper-level trough will result in additional heavy rainfall across the area and there can be a thunderstorm mixed into the picture. The passage of a cold front later today will reverse temperatures from the early day highs in the 60’s to the middle 40’s by day’s end. Much colder-than-normal air will ride in on strong NW winds during the overnight hours and temperatures on Thursday and Friday will be well below-normal for this time of year. One final note, as the initial burst of cold air pours into the late today/early tonight, there can be a brief period of snow or snow showers and small accumulations cannot be ruled out in some of the far N/W suburbs.
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