Thursday December 15 – A Winter Storm Watch has been issued for Friday night through Saturday morning. This is for minor snow accumulation plus ice before a change over to rain Saturday. The map looks incomplete because the National Weather Service Office in Sterling VA issued this first for the Baltimore/Washington region. I expect the other weather service offices that include Cecil County/Eastern Shore, Delaware, and Pennsylvania will catch on by this evening. I have snow maps for all of our Mid Atlantic regions below.  This doe highlight the main concern will be north of I-70 and northwest of I-95. Closer to the big cities and Bay there will be some snow and icing, but the impact is more dependent on the specific depth and duration of cold air.

Quick Notes:

  • Arrival of snow: 10 PM Friday to 2 PM Saturday
  • Mix to sleet and freezing rain: 6 AM to 9 AM Saturday…. later farther north
  • Change to all rain: From south to north but all areas by early afternoon Saturday
  • Basically if you have plans Saturday afternoon you should be fine.
  • Ravens game will be wet but can end with some snow.
  • Sunday:  Rain may end with a mix to snow. If the front stalls, some snow could linger Monday morning near and south of I-95

Compare the GFS and Canadian Model Timelines. Multiple Snow Projection Maps Below

I will post my first call for snowfall map in this evening’s report.

The GFS is later to arrive with the snow. The first wave north in PA until after midnight. Then a faster change over to an icy mix by daybreak Saturday. The Canadian Model suggests an earlier arrival of snow, then a longer duration of icing into mid day Saturday.

GFS Model —> slider 

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Canadian GEM Model —> slider 

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Snow Potential Maps

There is agreement with a general 1 to 3 inches near and north of Baltimore through southern PA.




National Weather Service Forecast Area Snow Maps





Faith in the Flakes Online- Flannel PJs Printed Inside Out

Store Now Open

  • We’ve added Flannel PJ Pants that will be printed inside out. They have to be, to make it snow ?
  • Free Personal Delivery for orders of 20 items or more to schools and businesses.
  • Click this image for the online store.
  • Look for more items to be added soon.
  • Also see the info for the STEM Assembly Spirit Wear program:  Put your school name on the shirts and raise money for you PTO/PTA in the process.


thatcher_snowsticksAvailable in 2 Ft, 30 Inches, and 3 Ft Sizes. Also with Orange/Black or Purple/Black. Click on the image to see the options offered by my friend Thatcher at Signs By Tomorrow in Timonium.

Go to to order yours today! Click the ‘Request a Quote’ button at the top of the page. In comment box include color, size and payment information. Please indicate whether you’d like to have us UPS ship them to you or if you would like to pick up in our store. Snow Sticks will ship or will be ready for pick up in our store 48 hrs after order is placed, Mon-Fri.

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Get the award winning Kid Weather App I made with my oldest son and support our love for science, weather, and technology. Our 3 year anniversary of the release and our contribution to STEM education is this November. It has been downloaded in 60 countries, and works in both temperature scales. With your support we can expand on the fun introduction to science and real weather.

Also See:

My Winter Outlook for 2016-2017: Colder with snow spread out more

NOAA Winter Outlook for 2016 to 2017

La Nina Formed: What it could mean to our winter

Farmers Almanacs Split On Cold And Snow

Extreme Weather of 2015 balanced out on both ends

Low Snow Winters In Baltimore: Records Might Surprise You

NOAA Ranks Blizzard 2016 4th Worst Snowstorm On Record

Blizzard 2016 Record Top Snowstorm: Area Totals