Friday December 11 2020
With all of this talk of the building chances for a coastal storm next week, now the number 2 storm might pass closer. One prominent model is producing snow nearby on Monday, which we will look at here. But the number 3 storm off the coast on Wednesday is our main event.
In anticipation, I had to look at the stats. It seems like it has been a while, because of our anemic winter last year. So, when was the last decent measurable snow (in Baltimore)?
How Long Since The Last Snow at BWI
- 339 Days Ago: January 7, 2020 = 1.5 inches
- 651 Days Ago/ 1 year, 9 months, 10 days: March 1, 2019 = 2.3 inches
- 660 Days Ago/1 year, 9 months, 21 days: February 20, 2019 = 4.5 inches
Only 1.8″ of snow fell all of last winter ( December 2019 to March 2020)
Are you ready to measure some snow? My partners and I have a special on SnowStix below with the storm maps.
Before we get ahead of ourselves, I will NEVER give a snow amount more than 72 hours before an event. The models show it and you can find that elsewhere. But I don’t believe in long range snow storm total maps given so many variables and a history of it not verifying.
However, I do think we have a good chance of a few inches of snow if the storm plays out as it looks now.
Monday Snow (Inland) As Well?
That said, we are within 72 hours of storm number 2, with a pleasant surprise from a few computer models. But since this is an abrupt change, I would like to see on more run to know if it is legit or bit off some bad data. If this holds, I will post snow potential in my report tonight.
The European ECMWF Model has a long spread as precipitation shifting north from prior runs. The cold air may remain in the mountains. ALSO this will be after a weekend in the 50s and 60s.
The GFS (American) Model is what I have been spending a lot of time on with the mid week coastal. Here, the latest solution is less exciting for Monday. But there is a shift north with the precipitation, just not enough cold air.
Mid Week Coastal Storm: Winter Event
A deep tough of cold air and plenty of energy will be swinging towards the east coast. This is what will provide the enhancement for a coastal storm to develop.
Storm Animation
Watch the Low Pressure develop rapidly as that cold air aloft catches up during Wednesday.
See the slider below for a closer view.
GFS Model —> slider
This projection shows an all day Wednesday winter weather event.
- Arrival is later, and it also keeps the Surface Low closer to the coast.
- Wednesday Afternoon: Later snow and mixing in metro areas.
- Overnight/Thursday morning: Heavy snow pulls across metro areas and Chesapeake Bay.
Wednesday Afternoon
Overnight/Thursday Morning
![December 11 weather storm snow ECMWF Thursday](https://www.justinweather.com/wp-content/uploads/2020/12/December-11-weather-storm-snow-ECMWF-Thursday.jpeg)
![December 11 weather storm snow Canadian Wednesday PM 4](https://www.justinweather.com/wp-content/uploads/2020/12/December-11-weather-storm-snow-Canadian-Wednesday-PM-4.jpeg)
These maps look impressive. In addition to getting this to verify, we need to get a handle on timing and temperatures. Both which can play a role in what can stick and pile up.
I will begin to give my snow forecasts for this this event on Sunday (with 72 hours of the event).
![December 11 temperature ooutlook GFS Friday](https://www.justinweather.com/wp-content/uploads/2020/12/December-11-temperature-ooutlook-GFS-Friday.jpeg)
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Also See:
December Climate, Sun Data, Solstice, ISS Flyovers, Moon, Planets, and The Great Conjunction
14 Local Maryland Pages (and York PA)
We have made a page for Maryland Weather which gives you the current conditions for 14 present area locations.
Maryland Weather Page
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