Precipitation is advancing northeastward this morning from the Southeast US and should arrive here during the mid-morning hours. This moisture will encounter some cold, dry air in the Northeast US that is currently being anchored by strong high pressure. As a result, there can be some evaporative cooling at the onset of the precipitation in the lower part of the atmosphere and this could cause some sleet to mix in with the rain; especially, to the N and W of the District. Low pressure headed for the Ohio Valley early today will transfer its energy to a newly forming coastal low near the NC/VA border and this will become the primary system later today. The precipitation will end later tonight from southwest-to-northeast across the metro region. After a bit of a milder day on Wednesday, the coldest air of the season so far will arrive later Thursday. On Friday, temperatures will do no better than the 30’s for highs, the wind will generate even lower wind chill values, and there can be a few snow showers. The below-normal cold will continue through the upcoming weekend and it looks like there will be additional Arctic blasts into the eastern US over the next few weeks.
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Low pressure will track northeastward on Tuesday towards the Mid-Atlantic region and will ultimately transfer its energy to an intensifying secondary low near the North Carolina/Virginia coastline. At the same time, strong high pressure situated over the Northeast US will be reluctant to give up its ground on Tuesday as it anchors a cold air mass. As a result, moist air pushing to the northeast will overrun the cold air in place and evaporative cooling will cause low-level temperatures to drop at the onset and then dynamical cooling will cause upper-level temperatures to drop later in the event. The end result of this unfolding scenario is that some frozen precipitation in the form of sleet and/or snow is liable to fall at times during this event across some of the northern and western suburbs of the big cities along I-95. Precipitation will taper off from SW-to-NE late Tuesday night/early Wednesday as the coastal low moves out to sea. After that, the coldest air mass so far this season will head our way for the late week and weekend. This late week Arctic blast will very likely be just the first of many in the eastern US over the next few weeks.
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One system pushes away from the region this morning and then another one with more available moisture arrives on Tuesday. In fact, tomorrow's system is likely to generate 0.50 to 1.00 inches of rainfall in the I-95 corridor region from DC-to-Philly-to-NYC primarily during the PM hours. Later in the week, much colder air pushes into the Mid-Atlantic region and temperatures on Friday, Saturday and Sunday are likely to generally be held down in the 30's for highs.
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Colder air moved into the Mid-Atlantic region on Thursday and it’ll stick around right through the upcoming weekend. High pressure building eastward from the Ohio Valley should keep us dry today, tomorrow and Sunday, but also quite chilly for early December. By Sunday night and Monday, moisture will advance towards us from both the Deep South and the Great Lakes and it could result in some sleet or rain late at night into early Monday. More significant moisture could reach us on Tuesday which could result in another decent rainfall. This same system is likely to produce additional beneficial rains for the south-central and southeast US before heading our way. Looking ahead, a widespread Arctic blast of colder-than-normal air will cross the nation next week and likely arrive here around Friday and it could be preceded by rain and a brief warmup.
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A low-level westerly flow of air will dry us out today and bring somewhat cooler air to the region compared to the past couple of days and then even colder air will push into the Mid-Atlantic region for the upcoming weekend. By late in the weekend or the early part of next week, moisture from the southern states could advance far enough to the north to produce some precipitation around here and it could be just cold enough for some of that to be of the frozen variety. After that, a brief significant warmup is possible later next week ahead of an advancing widespread cold air outbreak that should reach us by the end of the week.
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A very active weather pattern shaping up for the next ten days or so. Moisture will ride up today along a stalled out frontal boundary zone into the Mid-Atlantic region from the Deep South and the result will be more heavy rainfall. In fact, there will be significant rain into tonight up and down the I-95 corridor and a few thunderstorms can mix in as well in these unseasonably warm conditions. The frontal system finally pushes through on Thursday and we’ll dry out some and cool down compared to the warm conditions of today. Even colder air pushes in on Friday and the weekend looks like it’ll turn out cold with mainly dry conditions to start. By late in the weekend, a storm from the southern states could affect us and it may be just cold enough to make it interesting. Looking ahead, all signs point to a major league widespread cold air outbreak by the end of next week across much of the US.
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Two separate low pressure systems will bring significant rain and possible thunderstorms to the Mid-Atlantic region over the next 48 hours and also to much of the eastern 2/3rds of the nation where it has been quite dry in recent weeks. An eastward-moving frontal system has stalled out in the eastern US and this boundary zone will act as a conduit for copious amounts of moisture to ride along into the Mid-Atlantic region from the Deep South. By the time early Thursday rolls around, many locations along the I-95 corridor from DC-to-Philly-to-NYC will have received 2 or more inches of rainfall from the two different low pressure systems. The front finally clears through the region on Thursday and high pressure with colder conditions will follow for the late week and early weekend. Looking ahead, there can be another significant rain event during the early part of next week and cold air is likely to affect most of the nation by late in the week.
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Two separate significant rain events are headed to much of the eastern US over the next few days where it has been quite dry in recent weeks. A cold frontal system will inch into the eastern states over the next couple of days and two different low pressure systems will ride up along its boundary zone creating two separate rainy periods around here – late tonight/Tuesday and then again from late morning Wednesday into Wednesday night. The front finally clears through the region on Thursday and high pressure with colder conditions will follow for the late week and early weekend
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Low pressure over the Great Lakes will push a weak frontal system into the area today and there will be a touch of light rain or drizzle at times, but nothing significant. Another weak system could cause a PM shower on Friday and then the weekend will be primarily dry and chilly. Looking ahead to next week, there is a chance for a decent rain event in the Mid-Atlantic region in the Tuesday/Wednesday time frame – something we haven’t seen in quite awhile around here.
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High pressure will build into the area today, but only for a brief time. Low pressure to our northwest will push a weak frontal system our way and that’ll produce a touch of light rain or drizzle at times from late tonight through Thursday. There is an outside chance that some ice pellets mix in with the light rain late tonight/early tomorrow in the far northern and western suburbs. Another weak system will slide into the region on Friday and it too can produce some light rain around here during the PM hours. Looking ahead, we have a chance for some recent rain around here next Tuesday or Wednesday and that hasn't happened in quite awhile.
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