The month of December ended with well above normal temperatures throughout the Mid-Atlantic region and the big cities of DC, Philly and NYC had no measurable snow. The new month and new year has coincided with a pattern change in the atmosphere that will bring winter weather to the eastern states including the strong likelihood for significant accumulating snow in parts of the Mid-Atlantic region with a focus on the zone from DC-to-Delmarva-to-southern New Jersey. A second winter storm is possible late this week that could result in more accumulating snow for the Mid-Atlantic region on Thursday night and Friday.
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An active weather pattern will continue across much of the nation during the next few days and indeed it is likely to last right through the upcoming New Year’s Day weekend. A huge difference in temperatures currently exists across the country from northwest-to-southeast and it is helping to fuel this activity with multiple low pressure systems to deal with as we head into the new year. A strong storm system on Saturday could have wide-ranging impacts from rainy, unusually mild conditions in much of the eastern US, severe weather in the Lower Mississippi and Tennessee Valleys, and accumulating snow from Colorado to Michigan. There is a chance that a follow-up storm takes place at the end of the weekend in the eastern US as sharply colder air pushes in from the northwest….something to monitor closely in coming days.
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There is calm right now across much of the western US, but that will begin to change dramatically over the next 24 hours or so. A series of storms will impact much of the western states for an extended period of time beginning later today and continuing right through the upcoming weekend. These storms will bring significant rainfall to low-lying coastal sections from southwest Canada to California and substantial snowfall to higher elevation inland locations to be ultimately measured by the foot in many spots. In addition, severe cold will filter southward from western Canada this weekend into the Pacific Northwest and this could result in single digit cold for places like Seattle and Portland by early next week.
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The strong storm that pounded California in recent days with heavy coastal rains and substantial higher-elevation snows is pushing into the mid-section of the nation today and it will be a high impact event over a large area. First and foremost, this low pressure system will intensify rapidly today and its pressure gradient field will tighten dramatically resulting in tremendous wind gusts of as high as 80-100 mph. Power outages have already been on the rise in the Southwest US and are likely to increase markedly later today and tonight as the storm intensifies and pushes to the north and east.
In addition, as this system pushes northeast from northeastern Colorado towards northeastern Minnesota, there will likely be a severe weather outbreak in its warm sector including the threat of tornadoes. Record high temperatures are likely to be set on the warm side of the storm over a large area. In the cold sector to the north and west of the storm, blizzard-like conditions will form later today and tonight with the combination of heavy, accumulating snow and tremendous winds. Heavy snow fell from this storm system during the past few days from the Sierra Nevada Mountains of eastern California to higher elevation locations of the interior western states such as Utah.
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The weather continues to be quiet across much of the eastern part of the nation and relatively mild for the middle portion of December. Meanwhile, a powerful storm is pounding away at California with heavy rainfall along coastal sections and heavy snows across inland, higher elevation locations. This same storm system will push into the central Plains on Wednesday and likely result in a widespread area that will experience record-breaking warmth and also powerful wind gusts of 50-60 mph. In the Mid-Atlantic region, the warmer-than-normal weather will likely peak on Thursday afternoon with temperatures climbing to 60+ degrees in the DC-Philly-to-NYC corridor. Looking ahead, there are several signals that point to a colder weather pattern for the northern US beginning early next week and this same change could also bring about a substantial cold period to eastern Europe/Russia later in the month.
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The weather this week will be quiet across much of the eastern two-thirds of the nation and relatively mild for the middle portion of December. The warmer-than-normal weather this week will likely peak on Thursday in the Mid-Atlantic region with temperatures probably reaching into the 60’s in the DC-Philly-to-NYC corridor. A different story is possible next week, however, as the overall pattern shows some signs of turning colder and potentially stormy in the northeastern part of the nation.
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The weather has been rather chilly in the Mid-Atlantic and Northeast US during the past few days, but a major league warm-up is coming on Saturday. In fact, the surge of warmth tomorrow will quite likely result in record highs in many spots including perhaps the DC, Philly and NYC metro regions. Another factor on Saturday will be the winds which will intensify substantially ahead of an incoming strong cold front perhaps gusting up to 55 mph or so. Showers are likely to accompany this frontal system on Saturday in the eastern states and there can even be some strong thunderstorm activity. It’ll turn considerably colder on Sunday following the frontal passage, but then warmer conditions will return next week. For today, the warm air will explode northward through the Mississippi Valley and a severe weather outbreak is on the table which includes the threat of tornadoes.
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While the weather today is pretty cold in the Mid-Atlantic and Northeast US with a touch of snow in some spots, a big warm up is coming by the weekend and the bulk of next week looks to be on the warm side of normal as we head towards the middle part of December. In fact, the surge of warmth expected this Saturday is likely to come with record high temperatures in much of the eastern US including along the DC-to-Philly-to-NYC corridor. Temperatures could actually soar towards the 70 degree mark in DC and Philly and climb into the middle 60’s in NYC – all well above-normal for this time of year and all would threaten record highs. This surge of record-breaking warmth will come ahead of the next strong cold front which can produce severe thunderstorms on Friday in the Mississippi Valley and even some strong thunderstorm activity later Saturday in the eastern states.
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A strong cold front will arrive in the eastern states late today and its passage will set the stage for some snow at mid-week in the Mid-Atlantic region and Northeast US. It’ll turn very windy and much milder today just ahead of the front along with a few rain showers. Temperatures will drop sharply in the overnight hours behind the front as the strong winds shift to a northwesterly direction. After a cold, dry and much less windy day on Tuesday, low pressure will push to a position off the Mid-Atlantic coastline by early Wednesday morning. The fresh cold air mass that arrives shortly following the passage of the front will maintain its ground at mid-week allowing for primarily snow in the Mid-Atlantic/Northeast US and minor accumulations are on the table.
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The weather pattern for next week looks quite active with a strong cold front arriving in the eastern states on Monday and then a low pressure system to follow at mid-week. The cold air mass that arrives early next week in the Mid-Atlantic/NE US will be reluctant to give up its ground as soon as mid-week and this could set the stage for some accumulating snow and ice in portions of the Mid-Atlantic/NE US.
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