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11:25 AM Sunday | **Not one, but two low pressure systems to monitor and significant accumulating snow is on the table…biggest impact for now appears to be in the DC-to-Philly corridor**

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11:25 AM Sunday | **Not one, but two low pressure systems to monitor and significant accumulating snow is on the table…biggest impact for now appears to be in the DC-to-Philly corridor**

Paul Dorian

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Overview
Strong, cold high pressure from southeastern Canada will edge into the Northeast US today and will become a source of cold air over the next few days as a complex area of low pressure heads towards the region.  In fact, it is looking like two separate low pressure systems may form over the next couple of days and there are forecasting complexities associated with each system, but significant accumulating snow is definitely on the table in the DC-to-Philly corridor and this threat could certainly expand north into the NYC metro region. 

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The first system is likely to generate precipitation from later Monday night into Tuesday and while accumulating snow is definitely on the table, this event is likely to feature a mixture of snow, sleet and rain.  The second system is likely to become the stronger of the two and take place in an overall colder environment with mainly snow later Tuesday night and Wednesday, but its northern extent is still in question.  It appears the biggest impact from both of these systems will be in the DC-to-Philly corridor – not so much in NYC as of current thinking - and there will be a sharp drop off in snow accumulations on the northern side which could lead to big differences in amounts over a short distance.  

 12Z Euro EPS snowfall forecast map with a noticeably shift to the northwest from prior runs

12Z Euro EPS snowfall forecast map with a noticeably shift to the northwest from prior runs

Stay tuned...many details still need to be ironed out.  By the way, another storm threatens around March 25th or so.

Meteorologist Paul Dorian
Vencore, Inc.
vencoreweather.com