This strong high pressure system will push off the eastern seaboard on Tuesday at the same time another one pushes into southeastern Canada. Meanwhile, moisture will push northeastward on Tuesday from the Gulf of Mexico and into the northern Ohio Valley and then it takes a turn to the east later tomorrow night and into the Mid-Atlantic region and Northeast US. Given the snow cover and strong high pressure system that will form over southeastern Canada, there is likely to be enough low-level cold air in place for some accumulating snow across interior sections of the Northeast e.g., New York State) and freezing rain will be possible across much of upstate Pennsylvania and northern New Jersey heading into Wednesday morning. In fact, there is a chance that some freezing rain develops all the way down into the suburbs of Philadelphia and New York City from late tomorrow night into early Wednesday.
By later Wednesday and during the days on Thursday and Friday, it should become warm enough for plain rain to fall throughout most of the Mid-Atlantic region and Northeast US. Indeed, the two warmest days of the week in the DC-to-Philly-to-NYC corridor are likely to be Thursday and Friday with highs potentially ranging at week’s end from the middle 60’s in DC to the middle 50’s in NYC.
One other note, this developing pattern of moisture flowing northeastward from the Gulf of Mexico into the eastern states will result in copious amounts of rainfall for the Lower Mississippi Valley during the next 5 days or so. In states like Louisiana, this week’s rainfall may be quite welcome as it has been very dry there in recent weeks.
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