An active weather pattern continues into the new year likely bringing the Mid-Atlantic region an accumulating threat this weekend and there are a couple other systems to monitor as well. One system will drop southeastward from Canada on Thursday and interact with a low pressure system near the southeastern US coastline and the combination can produce some rain and/or snow shower activity in the area from late tomorrow night into early Thursday. This first system will not be a big deal for us; however, it will intensify significantly when it moves well off the NE US coastline and it’ll end up playing a key role in the potential weekend accumulating snow event. Low pressure pulls out of the southern US this weekend and will push in this direction and it’ll run into a cold air mass over the Mid-Atlantic region thanks in part by the passage and intensification of the first system. The ultimate storm track for the weekend is still in some flux, but the potential is there for accumulating snow in the Mid-Atlantic region and, in some areas, the most in a long time.
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The active weather pattern that brought multiple heavy rain events to the Mid-Atlantic region in December continues into the new year and it could result in an accumulating snow event this weekend. In addition, there will be a predecessor system that can bring some rain and/or snow shower activity from later Wednesday night into Thursday. This initial system will not be a big deal; however, it will intensify significantly once well off the Northeast US coastline and likely end up being a key player in the weekend event.
Low pressure pushes out of the south-central part of the country this weekend and will have plenty of available moisture. The weekend system will run into a cold air mass over the Mid-Atlantic region thanks in part by the passage and intensification of that preceding low pressure and its ultimate location (50 degrees latitude/50 degrees longitude). The storm track for the weekend storm is still in some flux, but the potential is there for the most snow seen in a long time for at least parts of the Mid-Atlantic region. Looking ahead, another (warmer) storm can follow during the early or middle of next week (~1/9-1/10) and signs continue to point to the possibility of widespread Arctic cold across much of the nation by the middle of January.
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A northern hemisphere stratospheric warming event that began during the latter part of November will rise to new levels within the next ten days or so and this could have important ramifications on temperatures across the central and eastern US from later January into February. Temperatures at the stratospheric level of 10 millibars will climb dramatically over the next ten days or so from about -70 degrees (Celsius) to about -25 degrees (Celsius) as warming aloft intensifies over the polar region of the northern hemisphere. The “polar vortex” that typically resides near or over the North Pole during this time of year will become displaced and “stretched” in coming days and this could unleash some high latitude cold air masses into the middle latitudes by the time we get into later January and February. In the near term, the weather pattern will be quite active across the eastern states with multiple systems to monitor during the next couple of weeks and temperatures will return to more seasonal levels.
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Low pressure will bring periods of rain to the NYC metro region today and tonight…some of the rain can be heavy at times late in the day and during the evening hours. Temperatures will remain on the mild side for this time of year reaching into the lower 50’s for afternoon highs. It stays unsettled for the next couple of days as a second low pressure system pushes into the eastern states. High pressure returns for the weekend as it turns slightly colder with temperatures likely back to the mid-to-upper 40’s for afternoon highs.
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Low pressure will bring periods of rain to the Philly metro region today and tonight…some of the rain can be heavy at times. Temperatures will remain on the mild side for this time of year reaching into the lower 50’s for afternoon highs. It stays unsettled for the next couple of days as a second low pressure system pushes into the eastern states. High pressure returns for the weekend as it turns slightly colder with temperatures likely back to the middle 40’s for afternoon highs.
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A large-scale upper-level low is spawning a couple of low pressure systems that will impact the region from tonight into Friday. Initially, it’ll be mild enough for rain showers, but as slightly colder moves in there can be some snow shower activity by tomorrow night and into the day on Friday.
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Low pressure will bring periods of rain to the DC metro region today and tonight, some of the rain can be heavy at times and there can be a thunderstorm mixed into the picture. Temperatures will remain on the mild side for this time of year reaching up into the middle 50’s for afternoon highs. It stays unsettled for the next couple of days as a second low pressure system pushes into the eastern states. High pressure returns for the weekend as it turns slightly colder with temperatures likely back to the mid-to-upper 40’s for afternoon highs.
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After yesterday’s snow, drier air will push into the region today and strong low pressure that impacted the region on Tuesday will gradually push away. Clouds should decrease and drier conditions should prevail on Thursday as well.
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The end of the year is closing in rapidly and this blog provides a wrap up of the 2023 US wildfire and tornado seasons and also the 2023 tropical season in the Atlantic Basin.
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December 1776 was a desperate time for George Washington and the American Revolution. Morale was low, hope for winning the war was diminishing, and the Continental Army led by George Washington was thinning in numbers after many battles lost to the British. December began with lots of rain and muddy travel conditions for the men which did not help with their spirits. After retreating through New Jersey, they set up camp on the Pennsylvania side of the Delaware River where the army was met with very cold weather that led to plenty of ice on the water. All in all, things were not looking good for Washington's army. However, George Washington devised a plan that would change the course of the war and the history of our nation.
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