December 15 2017 10 AM (reposted after site crash)

The small winter event on the way is causing big problems. First, the timing of the worst impact will be during the afternoon and into the evening. Many school systems are scrambling to try and decide if they should adjust their plans and maybe close early. Secondly, this is not something we can track on radar. It will be developing right on top of us. The physics of the atmosphere are already proving this is working. As of this post time, the light snow has begun a little early and just the sight of snow will be enough to raise attention.
Here are the basics as I see it and the best potential for snowfall. My snow map is posted below. Please note that the air and ground are colder than last weekend, so we have a better chance for road stickage and travel problems during the afternoon.

Winter Weather Advisory

The purple shaded areas are where the Winter Weather Advisory is in effect between 1 and 7 PM today.

I see issues extending into southern Pennsylvania (York and Lancaster Counties). Also, temperatures will be cold enough for some accumulation in Southern Maryland as well.

High Temperature Forecast

 

Upper Level Feature

This maps shows the voracity aloft around 18,000 Ft. That is spin translating to energy in the jet stream. This Jet Streak will shift over our area today with the enhancement of snow during the afternoon.

Water Vapor Satellite Loop: 24 Hours

You can see the influx of energy from the south lined up like the Jet Streak and drifting north in our direction.

—> slider: Snow Timeline

Snowstix- We Need You To Measure Snow Too

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Potential Snowfall

Please note that some of the regions are overlapping. This is due to the wide range expected as the bands develop. It is tough to track before they form.

A: Back edge of flurries or light snow that may drop of coating.

B: Between a coating to 2 inches. This depends on where the snow bands set up.

C: Between 1 to 3 inches. This depends on where the snow bands set up.

D: May have rain or sleet during the day and change to snow after 3 PM. Snow this evening could drop a coating to 1 inch and lead to slick travel.

 

Tonight:

Yes, temperatures wil stay below freezing, so additional salting will be needed.

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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