There was some rainfall in the DC-to-Philly-to-NYC corridor on Monday which was certainly a welcome happening; however, overall totals were on the low side due to the quick movement of the low pressure system. The rain event coming from late Tuesday night through Wednesday will be quite a different story, however, and likely the biggest single rainstorm in this area since early June. Rainfall amounts can exceed 2 inches all along the I-95 corridor and a few thunderstorms can mix into the picture. The combination of a strong surface cold front, plenty of available moisture, and a deep upper-level trough that becomes “negatively-tilted” will lead to this heavy rain event
In addition to the rain, the winds will become an important factor; especially, along coastal sections of the eastern seaboard from the Carolinas to New England where a low-level jet is going to become very intense. In fact, there is the potential for winds to gusts to 60 mph late Wednesday across portions of eastern New England where the low-level jet will reach its greatest strength.
In terms of temperatures, it’ll be unseasonably mild through much of the day on Wednesday - ahead of the strong cold front - temperatures will drop sharply late in the day or early tonight on the heels of its passage. This cold air intrusion can lead to a brief period of snow in some of the N/W suburbs along the I-95 corridor where small accumulations cannot be ruled out this evening. Finally, this cold blast will result in yet another “Great Lakes snow event” for those areas just downstream of Lakes Erie and Ontario (e.g., Erie, PA, Watertown, NY).
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There was some welcome rainfall yesterday in the Philly metro region, but it didn’t amount to all that much as the system involved was a rather quick mover. After a damp and foggy day on Tuesday, another rain event is on the way and this one will be much more significant than yesterday’s with more than 2 inches on the table between late tonight and tomorrow night. In addition to the rain, the winds might become quite strong both ahead of the advancing cold front on Wednesday from a southerly direction and also on its backside on Wednesday night from a northwesterly direction. The combination of a strong surface cold front, plenty of available moisture, and a deep upper-level trough that becomes “negatively-tilted” will lead to the heavy rain event. A cold blast will follow the passage of the cold front with temperatures on both Thursday and Friday well below-normal for this time of year.
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There has been some rainfall today in the DC-to-Philly-to-NYC corridor which is certainly quite welcome; however, overall amounts will end up being on the low side. Another rain event will follow by mid-week in an active weather pattern and this one is likely to feature significant rainfall that can exceed 2 inches all along the I-95 corridor with a few thunderstorms likely to mix into the picture. In addition to the rain, the winds might become very strong both ahead of the advancing cold front from a southerly direction and also on its backside from a northwesterly direction. In fact, wind gusts to extreme levels of 80+ mph are on the table late Wednesday/Wednesday night near and along the strong cold front along the coastal sections from eastern North Carolina to eastern New England. The combination of a strong surface cold front, plenty of available moisture, and a deep upper-level trough that becomes “negatively-tilted” will lead to this heavy rain event from late Tuesday night through Wednesday evening. A cold blast will follow the passage of the cold front for Thursday and Friday with temperatures on both days well below-normal for this time of year.
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The overall weather pattern changed to a milder one on Sunday in the Mid-Atlantic region and it’ll become quite active as well for much of the week ahead. Some rain is likely here from later today into early tonight as a strong upper-level trough slides east from the Midwest and then a soaking rain is likely late Tuesday night and Wednesday with the approach of a strong cold frontal system. The rain can be heavy at times at mid-week with 1-2 inches possible around here and a thunderstorm can be mixed into the picture. Following the passage of the cold front, it turns much colder here later Wednesday night and stays quite cold on Thursday and Friday with well below-normal temperatures on each of those days.
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A strong Arctic cold front pushed through the area on Thursday morning and today will turn out to be one of the coldest day so far this season with high temperatures likely confined to the lower 30’s. In addition, stiff NW winds will produce much lower wind chill values making it feel even colder than those well below-normal ambient temperatures. Moderation begins this weekend and it’ll turn noticeably milder for the early part of next week to go along with the chance of rain.
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A strong cold front will push through the area early today and its passage may be accompanied by snow showers and perhaps even a brief heavier snow squall. Any quick burst of snow early today can result in slippery road conditions due to the fact that the ground is quite cold given the recent extended stretch of well below-normal temperatures. Winds will shift to a northwesterly direction on the heels of the frontal passage and can gust to 50 mph or so from later this morning into later tonight potentially resulting in some downed tree limbs and scattered power outages. Arctic air will flood the Mid-Atlantic region later today riding in on these strong NW winds and this will lead to the lowest wind chills of the season so far. After a cold and windy day on Friday, temperatures will moderate as we go through the upcoming weekend and rain is back in the forecast for the early part of next week.
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Low pressure will move in a general “west-to-east” fashion across southern Canada during the next 48 hours and it will strengthen dramatically by the time it reaches the Canadian Maritime Provinces on Friday morning. This intensifying storm system and its associated strong cold front will have a big impact on the Great Lakes, Mid-Atlantic and Northeast US between later today and Friday to include some accumulating snow, possible snow squalls, powerful and potentially damaging wind gusts of 50 mph or so, and the ushering in of another Arctic air mass which will produce the lowest wind chills of the season so far.
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Low pressure will push across southern Canada during the next couple of days in a general “west-to-east” fashion and it’ll strengthen markedly by the time it reaches the Canadian Maritime Provinces late tomorrow. This low pressure system will have a trailing strong cold front that will slide across the I-95 corridor region during the early morning hours on Thursday and its passage will likely not go unnoticed. There can be snow and/or rain showers along the I-95 corridor from later tonight into tomorrow morning and perhaps even a heavier snow squall as the cold front surges towards the coast. Small accumulations are on the table between later tonight and late morning on Thursday and, as a word of caution, the ground is quite cold given the recent temperatures so any snow that does fall – even if only minor amounts - can quickly lead to slippery road conditions.
In addition to the snow and/or rain showers, the winds will become a big factor increasing noticeably later today and tonight from a southwesterly direction and then they are likely to gust to 50 mph or so from a northwesterly direction on Thursday and Thursday night following the passage of the front. These powerful NW winds later tomorrow and tomorrow night will usher in another Arctic air mass and wind chills are likely to reach their lowest levels so far this season.
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The month of December has gotten off to a cold start across much of the eastern half of the nation and it should stay colder-than-normal right through the upcoming weekend. A strengthening low pressure system will move across southern Canada during the next couple of days reaching the Canadian Maritime Provinces by late Thursday and this system and associated cold front will have multiple weather impacts on the Great Lakes, Mid-Atlantic and Northeast US.
To begin, this storm system is likely to add to the on-going “lake-effect” snows across the Great Lakes during the next couple of days and it will also produce some accumulating snow in the interior, higher elevation locations of the Mid-Atlantic and Northeast US. Even the I-95 corridor region from DC-to-Philly-to-NYC-to-Boston can experience small accumulations of snow from later tomorrow night into Thursday with the combination of snow showers and perhaps even a heavier snow squall. In addition, winds will become a big factor with a stiffening southwesterly flow of air out ahead of the approaching strong cold front and then potentially damaging gusts to 50 mph or so from a northwesterly direction on Thursday following the passage of the front. One last impact will be the influx of another Arctic air mass that will flood the northeastern states riding into the region on those powerful NW winds and likely resulting in the lowest wind chills of the season so far.
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The month of December has gotten off to a cold start across much of the nation and it’ll stay colder-than-normal in the DC-to-Philly-to-NYC corridor right through the upcoming weekend. Strong and strengthening low pressure will pass by to our north on Thursday and its trailing cold front will push through during the morning hours. This low pressure system and its associated cold front will have many weather impacts on the region from later tomorrow into the day on Friday.
Ahead of the system, winds will increase from a southwesterly direction later tomorrow and tomorrow night and then can gust to 50 mph or so from a northwesterly direction later Thursday and Thursday night on the backside of the front. Also, there is a good chance of snow and/or rain showers on Wednesday night and snow showers are possible on Thursday morning - perhaps even a heavier snow squall - as the strong front comes through the area with small accumulations on the table. Finally, the passage of the cold front will flood the Mid-Atlantic region with another Arctic air mass that will keep temperatures around here well below-normal on Thursday night and Friday and we’ll experience the lowest wind chills so far this season.
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