The chances are growing for a significant winter storm to impact the Mid-Atlantic/Northeast US from later Sunday into Monday. In fact, many ingredients appear to be coming together for a storm system that can have a high impact over a large area of the eastern third of the nation from later Sunday into Monday with snow, ice, rain, coastal flooding, and even high (damaging) winds on the table. There are many details that still have to be ironed out with several days to go before this potential event and the main upper-level wave of energy is way out over the Pacific Ocean. The I-95 corridor may be right on or near the dividing line between substantial snowfall to the north and west and a mix of rain, ice and snow to the south and east.
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An Arctic air mass will loosen its grip on the region today and temperatures will modify after quite a cold start. In fact, temperatures should climb well up into the 30’s this afternoon and additional warming will take place on Thursday with highs likely back in the 40’s. After that, the trend in temperatures will be down once again with progressively colder conditions to return for Friday and Saturday as high pressure re-establishes across southeastern part of Canada.
Later this weekend, a vigorous wave of energy in the upper atmosphere will likely help to generate surface low pressure in the southeastern states and it could have an important impact on the Mid-Atlantic region in the “later Sunday/Monday” time frame…stay tuned on this potential significant winter storm.
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An Arctic cold front pushed through the Mid-Atlantic/Northeast US on Monday night and the northeastern quadrant of the nation is suffering today as a result. Temperatures are way below-normal for this time of year despite some sunshine and a stiff NW breeze is pushing wind chill values down into single digits and, in some spots, to sub-zero levels. There will be some modification in temperatures on Wednesday and Thursday, but another cold air mass will arrive from the northwest at week’s end. Looking ahead, the overall weather pattern appears to be evolving into one that could feature multiple storm threats for the eastern US in coming days. A first system looks like it’ll stay far enough off the east coast on Thursday and Friday to have little or no impact in the Mid-Atlantic region, but it still needs to be monitored and could skirt eastern New England. A second storm threat could come in the Sunday/Monday time frame and this one has a much better chance at having an significant impact in the Mid-Atlantic/NE US.
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The passage of a secondary cold frontal system last evening ushered in the coldest air mass in a few years for the Mid-Atlantic region and Northeast US. Despite some sunshine today, temperatures will be confined to the 20’s for highs – way below-normal for this time of year – and a stiff breeze will produce wind chills down in the single digits. After another very cold night, temperatures will modify some on Wednesday and even more on Thursday with highs likely reaching 40+ degrees on Thursday afternoon. An “ocean” storm will form late this week in the southwestern part of the Atlantic Ocean and it will likely stay far enough off the coast to have little or no impact around here. The overall weather pattern will, however, likely produce other storm threats for us beginning later this weekend and lasting into at least the middle part of next week.
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A cold front passed through the Mid-Atlantic region on Sunday night and a secondary cold front will come through on Monday evening. This secondary cold front will usher in true Arctic air for the region with its origins way up in the high latitudes and the stretch of weather from Monday night through Tuesday night will feature some of the coldest conditions we’ve experienced in quite awhile and some “face-slapping” wind chills. The “Great Lakes snow machine” has been activated with the Arctic air mass flowing over the relatively warm waters and will continue into Tuesday for downstream locations. Looking ahead, the overall weather pattern is likely to evolve into one that can produce storms in the eastern US during at least a 10-day stretch beginning this weekend.
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A strong cold front passed through the region on Sunday night and it has ushered in a cold air mass for today, and a reinforcing Arctic front will pass through early tonight - true Arctic air will follow this second front. The approach and arrival of the Arctic front later today/this evening could produce some snow shower activity in the Mid-Atlantic region. The coldest core of this Arctic air mass will be across the area from tonight through tomorrow night as high pressure edges into the area. Temperatures will modify on Wednesday and Thursday, but we’ll have to get through a 36-hour or so deep freeze first - conditions we haven’t seen around here in quite awhile.
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Accumulating snow ended this morning across the Mid-Atlantic region and, in its wake, there are quite windy and cold conditions with partial sunshine. The next threat of wintry precipitation looks like it will come early in the day on Sunday, January 9th and this time, it will likely be in the form of freezing rain and/or sleet. The opportunity for icing will come on Sunday morning as milder air tries to advance northeastward into what will be a cold and dense air mass. It doesn’t take much in the way of icing to have an important impact on travel conditions. Whatever precipitation does fall on Sunday, it will certainly be followed by an Arctic outbreak for the early part of next week that will feature some very impressive cold for the northeastern quadrant of the nation.
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Low pressure that generated the overnight snowfall continues to intensify this morning as it pushes northeastward over the open waters of the western Atlantic. This system will push fairly rapidly during the next few hours to a position off the east coast of Maine by mid-day. Any snowfall early today will taper off by mid-morning leading to a windy mid-day and afternoon with the return of some sunshine. Later tonight, temperatures will drop well down into the teens and Saturday will remain much colder-than-normal for this time of year despite some sunshine. Milder air will try to push into the area late Saturday night and Sunday and this process may initially result in some icing in some areas. By later Sunday, temperatures should be able to reach the 40 degree mark, but the warm up will be short-lived as another impressively cold air mass will arrive early next week following the passage of the next cold frontal system.
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An upper-level disturbance is helping to generate surface low pressure in the southeastern states at mid-day and this system will intensify over the next 24 hours as it moves rather quickly to the northeast - likely reaching the waters off of eastern Maine by mid-day on Friday. Accumulating snow will spread across the DC-to-Philly-to-NYC corridor later tonight and it’ll wind down on Friday morning from southwest-to-northeast. There are likely to be small-scale heavier snow bands that develop later tonight/early Friday associated with mid-level “frontogenetic forcing” and these will produce localized higher accumulation amounts. It’ll be quite cold during and after the storm and another very impressive cold air blast will arrive in the Mid-Atlantic/Northeast US early next week.
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An upper-level disturbance will help to develop low pressure today in the southeastern states and this system will intensify as it moves fairly quickly to the northeast reaching the waters off of eastern Maine by mid-day Friday. Accumulating snow will spread across the region tonight and it’ll come to an end early Friday morning likely resulting in an accumulation of 3-6 inches although isolated higher amounts are possible. Temperatures will drop well down into the teens on Friday night in the wake of the low pressure system and it’ll stay quite cold on Saturday. A brief warm up into the 40’s on Sunday afternoon will be followed by another impressive cold shot early next week following the passage of another cold frontal system.
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