The passage of a strong cold front on Wednesday evening ushered in a much colder air mass and temperatures will remain well below-normal through Friday. Winds will stay quite strong today from a west-to-northwest direction making it feel even colder than the actual ambient temperatures. High pressure will be in charge to be the weekend and temperatures will moderate some and then a couple of low pressure systems will affect the region from Sunday night through Tuesday.
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The combination of an intensifying surface low pressure system, a strong cold front, and a deepening upper-level trough will result in additional heavy rainfall across the area and there can be a thunderstorm mixed into the picture. The passage of a cold front later today will reverse temperatures from the early day highs in the 60’s to the middle 40’s by day’s end. Much colder-than-normal air will ride in on strong NW winds during the overnight hours and temperatures on Thursday and Friday will be well below-normal for this time of year. One final note, as the initial burst of cold air pours into the late today/early tonight, there can be a brief period of snow or snow showers and small accumulations cannot be ruled out in some of the far N/W suburbs.
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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 DC 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 morning, 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 later tonight and late tomorrow. 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 from late Tuesday night into Wednesday 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 days so far this season with high temperatures likely confined to the middle 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 on Thursday evening. 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 through the area and to the east coast. Small accumulations are on the table between later tonight and the late morning hours on Thursday and, as a word of caution, the ground is quite cold given the recent below-normal temperature pattern so any snow that does fall – even if only minor amounts - can quickly lead to slippery road conditions early tomorrow.
In addition to the snow and/or rain showers, the winds will become a big factor during this weather event increasing noticeably later 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 and potentially damaging NW winds later tomorrow and tomorrow night will usher in another Arctic air mass and wind chills are going to reach their lowest levels so far this season.
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