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    Dave Epstein

    Another nor’easter is coming Thursday night, and this one may bring snow

    This isn’t going to be a major snowstorm, but there could be some accumulation of snow.
    David L. Ryan/Globe Staff/File 2018
    This isn’t going to be a major snowstorm, but there could be some accumulation of snow.

    Tuesday’s nor’easter has now moved out to sea, and this will allow much colder air to filter into the region overnight. Boston has not yet had an official freeze, but that will all change over the next 24 hours as temperatures go below freezing across much of the region. Wednesday and Thursday will both be particularly cold days, with highs staying in the 30s. That’s more typical for late December and early January than it would be for this time of the year.

    An active pattern continues in the eastern part of the United States, as shown in Tuesday’s water-vapor loop. (COD Weather)

    All this cold air will set us up for a different type of storm system Thursday night and Friday. Another in this long series of low-pressure areas will move along the coastline for another November nor’easter. Because there will be enough cold air at all layers of the atmosphere when the storm begins, many of us will see our first snow of the season. In November, it’s much more difficult to get snow all the way to the coastline, but it’s certainly not impossible. This makes the area inside Route 128 particularly difficult to forecast three days before the storm.

    A mixed bag of snow, sleet, and rain will move through New England before dawn Friday. (COD Weather)

    This isn’t going to be a major snowstorm, but there could be some accumulation of snow on the roads, especially north and west of Route 128 and into the higher terrain of Middlesex and Worcester County. Even western Essex County could see some accumulating snow late Thursday night and early Friday.

    There is a strong likelihood of an inch or more of snow west of Route 495 early Friday morning.
    NOAA Data
    A look at expected snowfall in the region.

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    This should change over to a cold rain during the day Friday, but there may be enough slush that some schools will end up delaying the start of their days. Doesn’t look like enough snow to create cancellations, but that’s going to be for the individual organizations to decide.

    Temperatures will be at or below freezing inland early Friday morning, cold enough for snow.
    COD Weather
    Temperatures will be at or below freezing inland early Friday morning, cold enough for snow.

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    After the storm, things will clear out for the weekend, and temperatures will be still running below average. Typically, we would see readings around the 50-degree mark, but I don’t think we’ll be near there, especially Sunday, when temperatures will be back into the 30s to low 40s.

    Next week looks like we get a break in the storminess, but we may not get a break in the cold air. A reinforcing shot of chilly temperatures could mean Thanksgiving week is very cold and the ground starts freezing up quite early. This doesn’t mean December stays that way, but there are small but growing signs we could be looking at a stormy start to that month as well.

    Follow Dave Epstein on Twitter@growingwisdom.