Sunday February 21 2021

A Winter Weather Advisory has been issued for the northern and mountain counties of Maryland into southern Pennsylvania. This was expected as we discussed in my prior report. It is beginning Monday morning just after sunrise for most, and ending as rain in the afternoon. In fact some have rain and possibly thunder on the southern edges as it crosses Delmarva.

The main concern here is the timing.  I continue to watch this, and the window is a little earlier between 8 AM and 10 AM for the first flakes. This will come on fast in the snow zone, but may be just as or after kids are getting to school. This will end before the end of the school day, most likely as rain with temps in the mid 30s.

Winter Weather Advisory

The National Weather Service issued this  for areas inland (north and west of I-95). This does not include the big cities or coastal Bay areas.

The general idea is for a 1 to 3 inch snowfall.

There will be snow to start for others, just expected to be less impact on roads and faster change to mix or rain.

February 22 Winter Weather Advisory Monday Snow

 

 

Sunday Afternoon Weather Map

This storm is racing eastward and will cover 1000 miles in the next 12 to 18 hours. It is just about to reach Chicago and it will arrive here shortly after sunrise Monday.

February 21 weather snow Sunday afternoon

 

Monday Forecast Maps

Morning Temperatures

The freezing line may cut through Baltimore, but primary interest is inland where it should be in the upper 20s.  After this cold weekend, and a morning event, there will be stickage.

Metro areas may start with snow, but a slushy coating or wet roads are expected between Baltimore, Annapolis, and Washington.

 

February 22 Temperatures Monday 8 AM

Radar Simulation —-> slider

This is the NAM 3 Km Model… Just one solution but I must give it credit for doing a good job with the sleet aspect last week.  Here we can see the mixing (or snow above freezing) in pink.

The snow may be heavy for a few hours between 10 AM and 1 PM. This may allow some colder spots and higher elevations to reach the upper end of snow potential.

Delmarva: Heavy rain and possibly thunder with the strong line crossing in the afternoon.

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Afternoon Temperatures

The entire region will get above freezing. This is why the snow should end with rain, and any stickage will be thawing.

 

February 22 Temperatures Monday 4 PM

 

How Much Snow?

 

UPDATE: Click To See

MY CALL FOR SNOWFALL

 

Generally 1 to 3 inches in the Advisory area, but I think some spots could top 4” with the snow burst and colder temps.

There could be a coating to 1 inch in Baltimore.

I will post my call map this evening. To be honest, I am covered in paint now,. My wife and I have been priming and painting kitchen cabinets. I broke away for this report, but I want to give proper attention for a snow map.

Please check back later for more and I will include other model maps to compare.

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