Strong high pressure overhead will push off the coastline by early tomorrow and this will open the door for moisture to head this way from the Mississippi Valley. A strong upper-level wave of energy will move eastward from the middle of the country and help to generate low pressure over the Ohio Valley on Friday morning. This initial low will actually give way to a secondary low that will form right over the Delmarva Peninsula on Saturday morning and rain can become heavy at times. It is likely to be cold enough for snow on Saturday only across interior and higher elevation locations of the Mid-Atlantic and NE US. Following the storm, it’ll become windy on Sunday as another cold air mass works its way into the Mid-Atlantic region.
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Strong high pressure centered to our west will continue to dominate the weather around here right into the end of the work week. At that time, attention will turn to a strong wave of energy in the upper part of the atmosphere which will drop into the Ohio Valley by the early part of the weekend and it’ll play an important role in the likelihood of rain in the NYC metro region and some of it may become heavy at times. Initially, a wave of low pressure at the surface will push into the Ohio Valley, but ultimately, a secondary system should form and become the main system.
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A strong wave of energy in the upper part of the atmosphere will drop into the Ohio Valley by the early part of the weekend and it’ll play an important role in the likelihood of rain and snow in the Mid-Atlantic/NE US. Initially, a wave of low pressure at the surface will push into the Ohio Valley, but ultimately, a secondary system should form near the Mid-Atlantic coastline. Odds currently favor rain in the I-95 corridor from DC-to-Philly-to-NYC, but a small change in the positioning of the upper level low to the south and east could result in a slightly colder solution for the big cities.
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Strong high pressure centered to our west will settle over the region on Wednesday and Thursday. This high will stay in control generating cold and dry weather conditions around here for the remainder of the work week. Low pressure will approach from the southwest on Saturday presenting us with another shot at a cold rain event or perhaps a combination of rain and snow.
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Strong high pressure will build into the eastern US early this week and it should result in cold, dry weather for much of the time. Highs over the next couple of days will be confined to the lower 30's and lows late each night could drop into the upper teens. Low pressure will approach from the southwest this coming weekend presenting the next chance of rain and/or snow.
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Dew point temperatures have plunged in the last 24 hours as a cold and very dry Arctic air mass takes hold in the Mid-Atlantic region and this will set the stage for a wintry mess on Saturday to include snow, sleet, freezing rain and some accumulations. This Arctic air mass is being anchored by strong high pressure building into the southeastern part of Canada and it will be very reluctant to give up its ground on Saturday as precipitation moves in from the Ohio Valley. As a result, temperatures will struggle to climb above freezing on Saturday; especially, in the northern and western suburbs along the DC-to-Philly-to-NYC corridor and this will likely result in an extended period of frozen precipitation.
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Strong high pressure will build over southeastern Canada today and temperatures here will struggle to pass the freezing mark. Winds will continue to be brisk gusting up to 30 mph or so, but they won’t be as strong as yesterday. Clouds will thicken up in the late night and early morning hours and precipitation will head this way on Saturday from the Ohio Valley. Given the cold and very dry air mass in place on Saturday, the initial batch of precipitation is quite likely to begin as snow around here in the early-to-mid afternoon and there can be accumulations of 1-3 inches. During the late afternoon hours, it'll turn somewhat milder in the upper atmosphere, but the low-level cold, dry and dense air mass will be reluctant to give up its ground. As a result, surface temperatures will struggle to climb above the freezing mark; especially, in suburban areas to the north and west of the metro region and this can lead to some icing problems on untreated surfaces. By tomorrow night, surface temperatures should climb above freezing in the immediate NYC metro area, but some freezing can still occur in areas to the north and west. Another cold, windy day is in store for the area on Sunday and the new work week will begin with quite cold conditions.
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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 past 50 degrees 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 freezing mark and therein lies a problem for Saturday. 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 early afternoon hours. Given the cold and dry air mass in place as we begin the weekend, there is likely to be an extended period of frozen precipitation at the onset with snow accumulations possible in the 1-3 inch range. Temperatures will struggle to climb through the 30’s on Saturday, but a changeover to plain rain is possible by day’s end or early on Saturday night. 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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