Tuesday March 6 2018

This morning is cold and allowing the ground to respond, but we still have a mild day in the 40s ahead. This is when we get to see how we can see high temperatures above freezing but a snow storm in between. The updated timeline below shows the development of rain and snow by this evening as a Nor’easter forms off of the coast. There is a second piece of energy that will feed into the storm Wednesday morning that will really allow it to take off. So there will be one pulse overnight as snow spreads across the northern half of the area. Then a second pulse during the morning as the storm intensifies.

Winter Storm Watch remains in the same areas. I expect the upgrade today to warnings and advisories based on snow amounts. The heavy zones could have 1 to 2 inch per hours rates on Wednesday. Some areas not under a watch will be in an advisory, but still expect the most snow east and northeast parts of our region.

I will post my snowfall map next.

Last night I answered the most common questions along with a map breakdown of where I expect the biggest impact to be. I have linked to that below. Please keep in mind that when you hear about snow potential in a county, that does not mean the entire county. The most snow will fall in Harford and Cecil in Maryland, but the gradient will be tight, meaning a wide range from low to high amounts over a short distance.  In Pennsylvania that gradient will increase from York to Lancaster with more to the east. See the latest timeline below. Also the latest look at anther storm trying to arrive at the end of the weekend.

Stats For March 6

Average High:  50ºF

Record High: 76ºF in 1935

Average  Low: 31ºF

Record Low: 10ºF in 1915

Snow Record: 10.0″ in 1962

Seasonal Snow To Date (at BWI): 8.7″

Sunrise: 6:31 AM

Sunset 6:04 PM

*Daylight = 2:33 longer than yesterday 

*Bay Water Temperature = 41ºF at Thomas Pt. Light House

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This Morning

Surface Weather Map

This storm already produced blizzard conditions in the northern plains, but that is only the second piece of energy feeding into this new storm. The main energy is flowing in from the south and will provide rain and snow showers this evening. A new Low will form off of the coast.


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High Temperatures



Snow Timeline Radar Simulation —> slider

This is the NAM 3 Km Model. I chose this because it has the best record all winter. Note the snow falling but most areas stay above freezing. The darker blue represents the heavier snow and it will take more intensity to overtake the ground to lay and stay.  Once it forms a layer, then more can accumulate. So some flakes will be wasted in the process.

Note the band approaching from the west Wednesday morning, then causing the storm to intensity.  Snow will ease up in the morning then intensity before noon.

[metaslider id=59676]


This is important for stickage and melting underneath. Also a re-freeze by Thursday morning.

Wednesday Evening Temperatures



Thursday Morning = some icing


My Snow Outlook Map

Also see: Snow Impact Breakdown Q and A


A: This is the Sweet Spot. This most snow will fall in eastern PA and may clip northern Cecil Co Maryland and northern Delaware. 

B: Snow will fall overnight Tuesday and should have a cover on the ground Wednesday morning. A general 1 to 3+ inches is likely by morning, with upside potential based on how much can stick before daybreak to allow more to stick during the day. 

C: Snow will mix in and change over Wednesday morning. It will snow during the day especially near Washington and east, but not stick on the roads. Roads should be wet. I-95 in Harford and Cecil county may be close to the stickage and melting line. It will be a tight gradient. 

D: Snow will mix in here but little to no stickage is expected. 


Snowfall Forecast Maps

Computer Models

NAM 3 Km

This model has the best performance for us all winter, so I need to stick with it now. I know it is the most aggressive and I know its weakness. So, please consider this with a grain of salt. I will make my own snow outlook map on Tuesday.

This looks a bit more realistic than the prior run I showed in my last report. There is still a big question about the stickage amount, but the zone for peak snow is my focus since this model did the best with our last snow event and much of this winter.




National Weather Service Regions

While this shows 2 to 3 inches in Westminster and Baltimore, look closely at the gradient and jump to Bel Air and northeast with more.


The jump from 3 inches Gettysburg to 5 inches in York and 7 inches in Lancaster could actually be more on the east end.


NWS shows Cecil County with a range from 1 inch in the south to 7 inches in the north. Just a sample of the spread in one county and it could be more pronounced depending on the banding snow.


Reminder: Winter Storm Watch means it may happen. I see some areas not highlighted here that could get in on an advisory


Another storm will try to develop over the end of the weekend. The latest run of the GFS keeps this father south. We really need to see how this fort storm behaves to know how the second one will respond and track.



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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