2:20 PM Wednesday December 13

Road crews are out preparing to drop brine ahead of light snow this evening. My prior update was all set to hold the clipper track along the Pennsylvania and Maryland line, thus keeping the snow north of I-70. A slight deviation is all that was needed to help push more snow over the mountains and into central Maryland this evening. With that said, we are still only talking about a coating of snow for most. Slightly more north.  But the timing this evening between 7 and 10 PM… after a cold day could briefly cause some travel issues.

One of my clients is McDonogh School and I just had a chat with them about their evening activities. Their busses travel between northern Carroll Co and Annapolis. I will be running my son’s basketball practice for a bunch of 5th and 6th graders. That is between 5:30 and 7:15 PM… So I know the potential impact concerns personally.

Upper Level Energy Helping

The surface Low in the image above is on track to move across the PA/MD line. But the upper level energy looks like it may push a little farher south. That is why the chance to move snow over the mountains into central Maryland is back on… for a few hours.

Water Vapor Animation


—> slider: Simulated Radar:

There could be an hour or two with a slight issue… that is why I am posting this update for you to plan around. The brief warm pavement today and light snow in the evening may lead to an initial melt/freeze. Otherwise, just a lit coating and a few hours. If you travel the Pennsylvania Turnpike, then the snow will linger longer and last into the morning.

Notice the green near Annapolis at 9 PM. Temps by the by will be marginal with freezing. This could be a “bridges are colder and freeze first” issue.

[metaslider id=55702]


Snow Total – Not Much

All it takes is a slick hour or two to be a problem, but not much to speak of in general The normally colder areas are best suited to get a half to full 1 inch of snow.

This will be done early in the morning and should not be an impact for the Thursday morning commute unless there are untreated roads.

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Also See:

My Winter Outlook 2017-2018 for more snow

Maryland Winters

La Nina Formed: What it could mean to our winter

NOAA Winter Outlook: Not The Best But Not The Worst For Snow

Two Farmers Almanacs Winter 2018 Outlooks

Winter Weather Folkore: Suggestions from Animals and Crops

First Frost and Freeze Dates For Maryland (southern PA and northern VA)

My Preliminary Winter Outlook Notes

Low Snow Winters In Baltimore: To Repeat Or Not Repeat

NOAA Ranks Blizzard 2016 4th Worst Snowstorm On Record

Blizzard 2016 Record Top Snowstorm: Area Totals

Extreme Weather of 2015 balanced out on both ends