A rapidly intensifying low pressure system will head towards the Great Lakes region this weekend from the southern Plains and it could very well become a news making event with wide ranging ramifications over a large area. This system has the potential to deepen to around 978 millibars (28.88 inches) or so by the time it reaches the Great Lakes early Sunday which may be close to monthly record low pressure values for portions of Michigan. Blizzard conditions are likely to accompany this powerful storm system this weekend over the Upper Midwest and Great Lakes. Farther east, rain will spread northeastward from the Mississippi and Tennessee Valleys and into the Mid-Atlantic region later Saturday and continue into early Sunday. Once the rain ends on Sunday, temperatures have a chance to spike to 60 degrees or higher in the DC-to-Philly-to-NYC providing us with a spring tease, but the warm up won’t last too long as colder air returns for the early part of next week.
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It’ll turn noticeably milder today following yesterday’s wintry event and high pressure will build into the region and control the weather around here through Friday. Very strong low pressure will move across the Great Lakes this weekend and bring us rain from later Saturday into early Sunday. Once the rain pulls away on Sunday, temperatures could soar to 60 degrees in the afternoon, but the warm up will be brief as colder air returns for the early part of next week.
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Snow began early this morning across the DC metro region and arrived during the mid-morning hours in Philly. Snow should break out during the mid-day/early afternoon hours in the NYC metro region. The snow will vary in intensity across the DC metro region for the next couple of hours and then transition to sleet and/or freezing rain during the mid-day or early afternoon. In Philly, the snow will become moderate-to-heavy at times for the mid-day and early afternoon hours and could begin the transition to sleet and/or freezing rain late this afternoon. All indications are that surface temperatures will stay at or slightly below freezing into the early evening hours in areas to the north and west of Route 95 from DC-to-Philly-to-NYC. This will keep the threat for icing intact right into the early evening in suburban locations along the I-95 corridor.
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A major winter storm will impact the Mid-Atlantic region today and tonight with accumulating snow on its front end before a changeover to ice and rain. An initial (primary) low pressure system will head towards the western Great Lakes today and a secondary low pressure will form near the Mid-Atlantic coastline. Another key player is strong, cold high pressure currently situated over New England and it will anchor cold, dense low-level air that will be reluctant to give up its ground. Snow is likely to break out by mid-day to early afternoon in the NYC metro region and can become moderate-to-heavy at times with accumulations expected on the order of 2-4 inches by late in the day (higher amounts in that range to the west, lower amounts to the east). By early tonight, milder air will advance into the region as winds turn more to the southeast and this should result in a changeover from snow to sleet and freezing rain and then ultimately to plain rain by late tonight. The low pressure system moves away on Thursday and allows for high pressure to build in from the west and temperatures could actually climb to 50+ degrees during the afternoon hours.
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Mid-Atlantic: A major winter storm will impact the Mid-Atlantic region on Wednesday and Wednesday night with significant accumulating snow on the front end in many areas before a changeover to ice and rain. An initial low pressure system will head towards the western Great Lakes on Wednesday and a secondary low pressure will form near the Mid-Atlantic coastline. Another key player will be strong cold high pressure that will be situated to our north at the beginning of this mid-week event and it will anchor cold, dense low-level air that will be reluctant to give up its ground. Snow should break out in the early morning hours on Wednesday in the DC metro region, around mid morning in Philly, and then during the mid-day or early afternoon hours in NYC.
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*A major winter storm will impact the Mid-Atlantic region on Wednesday with accumulating snow on the front end in many areas before a changeover to ice and rain.* An initial low pressure system will head towards the Great Lakes on Wednesday and a secondary low pressure will form near the Mid-Atlantic coastline. Another key player will be strong cold high pressure that will be situated to our north at the beginning of this mid-week event and it will lock-in cold, dense low-level air. Snow should break out by mid-day to early afternoon (10AM-1PM) in the NYC metro region. By late Wednesday afternoon or early Wednesday night, milder air will advance into the region as winds turn more to the southeast and this should result in a changeover to sleet and freezing rain and likely to plain rain by late Wednesday night. Accumulations expected on the order of 2-4 inches before the changeover. The low pressure areas moves away on Thursday and allows for high pressure to build in from the west.
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A major winter storm will impact the Mid-Atlantic region on Wednesday with significant accumulating snow on the front end in many areas before a changeover to ice and rain. An initial low pressure system will head towards the Great Lakes on Wednesday and a secondary low pressure will form near the Mid-Atlantic coastline. Another key player will be strong cold high pressure that will be situated to our north on Wednesday and it will lock-in cold, dense low-level air - at least at the onset of this mid-week event. Snow should break out in the early morning hours on Wednesday in the DC metro region, then by the mid-to-late morning hours in Philly, and finally during the mid-day or early afternoon hours in NYC.
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*A mid-week mess is on the way that will likely include accumulating snow on the front end*. By late Tuesday, strong high pressure will be forming to the north and northwest of the Mid-Atlantic region and there will be lots of moisture pushing northeastward from the Gulf of Mexico. This area of high pressure will lock in a cold, dense air mass in the lower levels of the atmosphere – at least for the onset of a mid-week storm system – setting us up for “overrunning” type precipitation as warmer air initially rides up and over the surface air mass. One surface low will trek from the Gulf coast states to the Great Lakes while a secondary low develops near the Mid-Atlantic coastline – quite similar to the setup early last week which resulted in snow, ice and rain for the Mid-Atlantic region. Snow is likely to break out here during the mid-day or early afternoon on Wednesday and then it could change to sleet and freezing rain late in the day as milder air pushes in from the southeast. Accumulations of snow are likely here on Wednesday before any changeover to sleet and freezing rain takes place.
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Low pressure will head our way later and although it is a fairly fast-mover, it is likely to have some impact on the Mid-Atlantic region; especially, to the north and west of the big cities. Snow, ice and rain is likely in areas to the north of the PA/MD border from late today into early Monday and a mix of ice and rain is expected to the south of there. Road conditions can become slick in all areas during the nighttime hours and into early Monday morning with possible small accumulations of snow and/or ice. By the middle of the week, we’ll have to deal with a stronger storm and this one could result in significant snow accumulations for much of the Mid-Atlantic region followed by ice and rain.
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Low pressure will head our way late Sunday and produce snow and ice north of the PA/MD border and a wintry mix to the south of the Mason-Dixon Line. Road conditions can become slick from late tomorrow into early Monday with small accumulations of snow and/or ice. By the middle of the week, we’ll have to deal with a stronger storm and this one could result in significant precipitation for the Mid-Atlantic region including accumulating snow, ice and rain.
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