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    Elliot Abrams

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    Cold All Week

    January 21, 2013; 8:17 AM ET

    Monday 10 AM

    Now that cold air has enveloped the Great Lakes and Northeast, it appears likely to persist all week. It appears this will be the chilliest January cold outbreak in four years.

    In 1992, meteorologists Steve Nogueira and Weir Lundstedt wrote about a type of trough that was involved in generated unexpectedly great amounts of snow. The troughs under study extended northwest from a low pressure area and were located underneath a pool of cold air several miles overhead. Most common in central and northern New England, these features can produce localized bands of very heavy snow, in some cases producing a foot of snow in areas where standard computer models were only suggesting a couple of inches of snow would fall.

    By taking the first three letters of the last names of the scientists writing about these troughs, you get Nor Lun, and so the troughs became known as Norlun Troughs. Such a system might develop tomorrow along or near the New England coast, perhaps between Boston and Portland.

    Aside from the possible Norlun Trough development and lakes related snows downwind from the Great Lakes the weather maker coming through should only create small accumulations. Of course, it does not take much snow falling in metropolitan area to cause travel problems.

    Another weak low pressure area and frontal system could cross the Great Lakes on Wednesday and move of the East Coast Thursday. After that, there is a chance that a stronger storm could take shape to cause accumulating snow from (at least) Maryland to Massachusetts on Friday. This video has more.

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    Here is a working draft of snow expectations for the Northeast from later today into tomorrow. I use the term "draft" because the map is updated frequently. Our other stories and forecasts on AccuWeather.com can keep you current.

    The views expressed are those of the author and not necessarily those of AccuWeather, Inc. or AccuWeather.com

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