Tuesday March 6 2018

I read a lot of comments on my last report and how there was such a discrepancy from my forecast to what may have been seen on TV or an app. I wanted to elaborate here. Also, the Winter Weather Advisory posted this afternoon just after my last update was expanded as expected… sort of. The Maryland Counties included now range from Carroll on the west end to northern Baltimore, all of Harford, and Cecil Counties. There will be 30 miles across our area that will spread the range of 1 inch to 6 inches or more of snowfall. So I would not let your guard down in Frederick and Howard Counties. Even Baltimore City is on the edge and has support for more snow with some models. We will all get snow to fall with temperatures staying above freezing. It is a matter of how much will stick besides the set up of the heavy stuff! Yes, being near the water will lower your snow totals due to melting and there may be some rain mixing in during the morning, before turning back to snow.

The Winter Storm Warning in Southern Pennsylvania includes York and Lancaster with the back edge of the heavy snow.  This will all begin tonight and then intensity during the morning. This area is most likely to have travel really hindered Wednesday.

I know there is a lot of information and my prior snowfall map might have been a little confusing. So I wanted to explain it in a quicker format. There are links to prior posts below.

My Snowfall Map (Updated Colors)

My friend Tony Pann sent me a text this afternoon. A few people at his station showed him my snow forecast and locked in on the high number. Thanks to Tony for reading my actual post and pointing out the yell circled area.  I left the purple color for all areas that I expect to have the most travel impact.

  • But here is the ‘sweet spot’ top snow zone fully shaded in yellow to make sure it is not confused with northern Maryland.
  • I have the 4 to 8 inch range in northern Maryland (Hereford Zone, northern Carroll and Harford Counties)
  • The best place to see close to a foot or more will be east of I-83 in Lancaster and eastern PA.
  • Frederick City I went on the edge of 2 inches or higher. More snow will be north towards Turmont.
  • Baltimore City will get loess near the water and more near Towson.

There will be upside potential in the snow zone shown with (+). Some heavy snow bands will make or break this map. The heaviest snow will be to the east, and the snow bands will dip into northern Maryland. I chose the standard edge of that to be near Westminster, Hereford, and Street.

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Compare To National Weather Service Zones Maps

Metro Baltimore/Frederick

There could spread 30 miles form 1 to 6 inches just in Baltimore County

Frederick is now in the 1 to 2 inch range from NWS. I read many saw just rain on their apps. I don’t follow weather app forecasts. Check them again and see if they updated



York is on the west end of the heavy snow. More will fall east towards Lancaster.




Northeastern Maryland, Philadelphia, and New Jersey

Thew snow gradient here could be 50 miles from 1 inch to 1 foot of snow. The Poconos will win the high end of snow.



Please click here to see my prior post to compare the NAM 3 Km, Canadian, and GFS Model snow updates



Please share your thoughts, best weather pics/video, or just keep in touch via social media

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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