Watch the dew points over the next 24 hours or so as they will plummet as a cold and very dry Arctic air mass pours into the Mid-Atlantic region on strong NW winds that can gust to 50 mph. This incoming air mass will be anchored by strong high pressure centered over the southeastern part of Canada from Friday into Saturday and it will set the stage for an extended period of frozen precipitation on Saturday in the Mid-Atlantic. Temperatures will only be able to reach the low-to-mid 30’s for highs on Friday afternoon in the DC-to-Philly-to-NYC corridor…some 20 degrees lower than yesterday. On Saturday, low pressure will move from the Upper Midwest to the central Great Lakes and precipitation will slide eastward from the Ohio Valley into the Mid-Atlantic region. Given the cold and very dry air mass in place on Saturday morning, there is likely to be an extended period of frozen precipitation in the Mid-Atlantic region with accumulations of snow and ice likely at the onset of this event.
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Temperatures climbed well into the 50’s on Wednesday which is well above-normal for mid-January but a much colder air mass arrives today following the passage of a strong cold frontal system. The much colder air mass will ride into the region on strong NW winds that can gust to 50 mph at times later today into early tonight. Strong high pressure will build into southeastern Canada on Friday and high temperatures here will struggle to pass the middle 30’s and therein lies a problem for Saturday morning. Low pressure will move from the Upper Midwest on Saturday to the central Great Lakes and precipitation will move east into our area most likely during the morning hours. Given the cold and dry air mass in place as we begin the weekend, there is likely to be a period of frozen precipitation at the onset with snow and ice accumulations possible of a coating to an inch or so. Temperatures should climb through the 30’s on Saturday allowing for a transition of the snow/ice to plain rain by later in the day. Another cold air mass will arrive on Sunday again riding in on strong NW winds and Monday and Tuesday promise to feature some of the coldest weather so far this season.
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Temperatures are climbing into the 50’s today in the I-95 corridor which is well above-normal for this time of year, but a strong frontal passage early tomorrow will usher in a much colder air mass for the end of the work week. The much colder air will ride into the region on strong NW winds that can gust to 50 mph at times. Strong high pressure will build into southeastern Canada on Friday and high temperatures in the I-95 corridor will be some 20 degrees lower compared to this afternoon’s readings. On Saturday, low pressure will move from the Upper Midwest to the central Great Lakes and precipitation will move east into our area. Given the cold, dry air mass in place on Saturday, there is likely to be a period of frozen precipitation at the onset in the DC-to-Philly-to-NYC corridor with some accumulations likely.
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Temperatures will make a noticeable rebound today from yesterday’s chilly conditions and should make it into the middle 50's which is well above normal for mid-January. A strong cold front, however, will cross the region early tomorrow and its passage will usher in a much colder air mass to close out the work week. This Arctic air mass will ride in on strong NW winds later tomorrow and tomorrow night that can gust past 40 mph. Strong high pressure will build across southeastern Canada on Friday and temperatures will struggle here to reach the middle 30's. Low pressure over the Great Lakes region on Saturday will spread precipitation our way and with a cold, dry air mass in place, there can be some snow and/or ice at the onset with minor accumulations. A cold, windy and dry day is setting up for Sunday to follow the wintry mess to start the weekend.
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Temperatures will climb back into the 50’s on Wednesday in the I-95 corridor which is well above-normal for this time of year, but a strong frontal passage early Thursday will usher in a big change for the end of the week. Arctic air will flood the region later Thursday and Thursday night riding in on strong NW winds which can gust past 40 mph. As a strong cold high pressure system builds into southeastern Canada on Friday, temperatures in the I-95 corridor will struggle to reach the middle 30’s. The influx of an Arctic air mass anchored by strong high pressure to the north will set the stage for a wintry mess on Saturday in the Mid-Atlantic region that is likely to include some accumulating snow; especially, north of the PA/MD border. This late week blast of Arctic air does not look like it will be an isolated event as there will likely be numerous cold air outbreaks for the central and eastern US in coming weeks.
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A strong cold front will push through the Mid-Atlantic region on Thursday and Arctic air will follow at the end of the work week. High pressure will build across southeastern Canada as we begin the weekend and this system will be a key player in the likelihood of accumulating snow on Saturday. Low pressure will develop over the Midwest on Saturday and a frontal system extending to its east will generate west-to-east moving precipitation which will most likely arrive as snow in the I-95 corridor from DC-to-Philly-to-NYC The low pressure system will head towards the eastern Great Lakes and a secondary system may try to form near the Mid-Atlantic coastline. It is likely that the snow which falls at the onset of the weekend storm system will transition to a mix of rain, sleet and snow and perhaps then change back to all snow before ending early Sunday. The cold air mass that arrives by Friday will be reluctant to give up its ground on Saturday as it’ll be anchored by a strong high pressure system to the north.
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Temperatures reached the 60’s this past weekend and this will be just a fond memory by the time we reach the upcoming weekend as a significant pattern change will begin that will return winter weather to the central and eastern US after an extended hiatus. In fact, an Arctic outbreak at the end of the work week will be backed up by strong, high pressure to the north and this will set the stage for a potential accumulating snow event for the DC, Philly and NYC metro regions on Saturday. This initial blast of Arctic air does not look like it will be the last. Indeed, it appears more and more likely that the latter part of January and perhaps much of the month of February will feature multiple cold air outbreaks from Canada into the central and eastern US and, no doubt, this will lead to additional snow threats.
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High pressure will build to our north today and it’ll turn cooler than Sunday, but still above-normal for the middle of January. Weak low pressure will head in this direction on Tuesday and increase the chance for showers, but should be nothing significant. Another low pressure system and its associated cold front can throw another shower our way on Thursday before ushering in an Arctic air mass at week’s end (and an overall colder weather pattern will get underway). This cold air outbreak is likely to set the stage for some snow and/or ice on Friday night and Saturday before a changeover to rain and accumulations are on the table.
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Temperatures have averaged well above normal across the eastern two-thirds of the nation for the first ten days of January, but all signs point to a flip in the overall pattern in about a week or so. While we have had cold air outbreaks in the eastern US during the past couple of weeks, they have not been sustained and milder conditions have returned rather quickly. In fact, after a couple of cold days in the eastern US this week, the weekend will feature a noticeable jump in temperatures with the 60’s possible on both weekend days in the DC-to-Philly-to-NYC corridor. The warm up will back down some as we start the new work week, but temperatures should remain above-normal on average for much of next week. After that, however, colder air will likely press in the eastern US and it may have more staying power than recent outbreaks.
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High pressure will shift off the coast today and a southwesterly flow of air will develop in the eastern US on its backside. A warming trend will begin today and then will intensify noticeably on Saturday along with a stiffening SW wind. Highs on Saturday afternoon are likely to be in the middle 60’s which is well above normal for this time of year. A powerful storm will trek towards the eastern Great Lakes on Saturday and wind up over New England by early Sunday. It’ll drag a cool front through the region on Saturday night with the likelihood of showers, perhaps even a strong thunderstorm. It turn a bit cooler early next week, but still warmer-than-normal for mid-January.
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