A major storm is going to become a multi-hazard event for much of the eastern half of the nation during the next few days. The storm will begin to unfold on Friday in the south-central US and then trek northeast to a position near the Great Lakes by Saturday evening and then over New England on Sunday. Heavy rain and severe weather is likely to take place south and east of the storm track and significant snow and ice is likely to its north and west. The impact in the I-95 corridor will be to bring unusually warm conditions this weekend with highs generally in the 60’s and there will be some rainfall, stiff winds, and perhaps a heavy thunderstorm or two.
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Low pressure is intensifying at this hour as it takes a path from the Tennessee Valley to the coastal waters of New Jersey and it will produce accumulating all along the I-95 corridor. Snow is closing in on the DC metro region and it should reach the Philly area during the mid-to-late afternoon hours and then into NYC by early tonight. While there can be rain mixed in at times in the initial stages of this event, the bulk of the precipitation in the DC-to-Philly-to-NYC corridor should be in the form of snow. General accumulations of 1-3 inches are expected from DC-to-Philly with isolated 4 inch amounts possible…slightly lesser snowfall totals are expected in NYC and Boston. Watch for slick road conditions this afternoon and tonight as the snow is likely to come down quite hard at times. In the wake of the storm, it’ll be cold and windy on Wednesday with gusts past 40 mph and snow showers and squalls are quite likely in much of the Mid-Atlantic region. The cold air mass that arrives in the wake of the storm will give way to a big warm up this weekend with the 60’s possible in the I-95 corridor.
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Low pressure will pull out of the Tennessee Valley early tomorrow and head towards the Mid-Atlantic coastal waters and the result is likely to be some accumulating PM snow in the DC-to-Philly-to-NYC corridor. Temperatures will be borderline in the I-95 corridor region in terms of snow versus rain on Tuesday, but odds favor snow in the metro regions and nearby suburbs or a changeover from a mix of rain and snow to all snow soon after the precipitation begins. The low will push away from coastal waters of New Jersey tomorrow night and another cold air outbreak will make it into the Mid-Atlantic region on Wednesday. Much like most recent cold air outbreaks, however, this chilly air mass will not last too long and it should give way to much milder conditions for the upcoming weekend and it’ll turn wet.
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The low pressure system that resulted in a wintry mix of precipitation in the Mid-Atlantic/NE US over the past 24 hours or so will reach a position off the New England coastline by later today. This system will drag a cold front through the I-95 corridor by early tonight and winds will pick up as a moderately cold air mass moves into the area. Watch for icy spots later tonight as temperatures drop into the 20’s in most areas and there may still be some wet roadways. Another front will arrive in the I-95 corridor tomorrow afternoon and this front will represent the leading edge of an Arctic air mass. The arrival of the Arctic frontal system on Wednesday afternoon will be accompanied by strong wind gusts, scattered snow showers, and perhaps an isolated snow squall or two. It’ll stay windy tomorrow night and on Thursday and it’ll turn sharply colder with some of the lowest wind chill values and temperatures of the season so far in the Mid-Atlantic/NE US.
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There will be two different parts to the current winter weather event with phase one already well underway and phase two coming from later today through Tuesday morning. Phase one featured some accumulating snow south of the PA/MD border earlier today and has had very limited precipitation so far north of the Mason-Dixon Line. Phase two will involve heavier precipitation amounts from later today into tomorrow morning as low pressure heads towards the region from the Lower Mississippi Valley. This second phase will generally feature ‘plain’ rain across the immediate DC metro region, but icing will be a big concern across much of PA, northern NJ and NYC where temperatures will hover around the freezing mark throughout the night as precipitation intensities pick up.
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Low pressure is located off the New Jersey coastline at mid-day and it will intensify over the next several hours as upper-level energy moves in overhead. Mixed precipitation is rotating around the surface low and will become mainly snow this afternoon and evening as colder air wraps into the system. Some snow will fall today and tonight in the Philly metro region, but the highest amounts will likely be confined to eastern Bucks County near the Delaware River and to the north and east of there which will put the northern half of New Jersey and the NYC metro region in prime zones for more significant accumulations from this western Atlantic storm. Little to no snow accumulation is likely in Chester County (SE PA) and in areas to the south of the PA/MD border.
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A long duration winter weather event is underway in the Mid-Atlantic region with a cold “plain” rain south of the PA/MD border, freezing rain and sleet across southeast and east-central PA, and snow is a factor in northeastern PA, interior upstate NJ and in the NYC metro region. As colder air wraps around a very slowly moving and intensifying low pressure system later tonight, accumulating snow will become an increasingly important factor for most areas and accumulations are likely; especially, north of the PA/MD border. In fact, there is the chance that some spots in the Mid-Atlantic region experience significant snowfall amounts on Monday and Monday night as intense mesoscale heavy snow bands are likely to form during this event.
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The major storm that slammed into the west coast a few days ago will result in a long duration winter weather event for the Mid-Atlantic region from late tonight into Monday night. This system is now generating blizzard conditions across the Dakotas and heavy snow will extend into the Upper Midwest later today and tonight. The upper-level feature associated with this storm has made its farthest push to the north into South Dakota and it will now be forced to shift to the east-southeast by an “atmospheric roadblock” in the form of upper-level high pressure ridging over southern Canada. The end result will be a cold air mass stuck in place in the lowest levels of the Mid-Atlantic region when precipitation arrives late tonight/early Sunday and this will lead to a period of sleet and/or freezing rain at the onset of this long duration event in much of the DC-to-Philly-to-NYC corridor. A change to plain rain is likely in many areas along the immediate I-95 corridor later tomorrow and there even be a slackening off of the precipitation early tomorrow night. Late tomorrow night and during the day on Monday, colder air will wrap around into intensifying low pressure off the Mid-Atlantic coastline and this will result in a changeover to snow in most areas and significant snow accumulations are possible; primarily, north of the PA/MD border.
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The major storm that slammed into the west coast a couple of days ago will result in a long duration winter weather event for the Mid-Atlantic region from later this weekend into early next week. This system now over the interior western US will head northeast towards the Northern Plains over the next day or so and will generate significant snow this weekend from the Northern Rockies to the Upper Midwest. It is at this point in time that this system will run into an “atmospheric roadblock” in the form of upper-level high pressure ridging over southern Canada and switch from a northeasterly direction to east-southeast. The end result will be a cold air mass in place in the Mid-Atlantic region when precipitation arrives later Saturday night and low pressure is likely to spin just off the coastline as late as late in the day on Monday. This long lasting winter weather event could feature some ice and/or snow accumulations at the front end for much of the Mid-Atlantic region – perhaps plain rain for awhile in the middle – and then potentially significant accumulating snow on the back end.
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One strong storm is producing heavy snowfall across the Upper Midwest today and it’ll generate some very strong winds later today into Thursday in a large section of the country extending from the Great Lakes/Ohio Valley to the Mid-Atlantic/NE US. Another powerful storm continues to wreak havoc across much of the western third of the nation with heavy coastal rain and significant inland snows. This second system will push to the northeast over the next couple of days, but once it reaches the Dakotas, it’ll run into an “atmospheric roadblock” and be “forced” to slide southeast towards the Mid-Atlantic/NE US coastline by later this weekend into early next week. The result of this storm track will allow for cold air to be in place in the Mid-Atlantic/NE US when the storm arrives later this weekend and this raises the chance for snow and ice. The threat for snow and ice will continue into Monday for this part of the nation as the surface low spins around just off the coastline of the Mid-Atlantic/NE US.
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