Arctic Boundary Passes Early Tuesday Quick Burst of Snow
Very Cold Air Tuesday Night Into Thursday
Today will be the one and only day this week where temperatures will actually be close to and in some cases above average for this time of year. An arctic front is to our west and moving slowly east but it doesn’t get here today. We actually should see a fair amount of sunshine today with some increasing in clouds from northwest to southeast developing during the afternoon and into tonight but no rain is forecast for today or much of tonight until the front passes. Temperatures today will reach the mid 50s to near 60 from NYC & Philadelphia south and east with cooler highs in the 40s to near 50 north and west of the big cities. Those areas are closer to the frontal boundary.
Not much is happening on the satellite and regional radar this morning other than high clouds moving east and there isn’t much activity going on rain or snow wise. This will change later today as we begin to see a wave of low pressure move along the arctic boundary. Clouds increase tonight with some rain developing by morning and well inland rain develops and changes to snow before daybreak
The heaviest snow falls across Northwest Pennsylvania across Western and Northern NY and into Northern New England. Amounts to the south will be far less. I think we could see the idea of a coating to at most an inch extend further south than what the Weather Service forecast is. It could run down as far south as the Delmarva Peninsula. This will all happen tomorrow morning into the afternoon for a handful of hours at most. Temperatures Tuesday start in the lower 40s early and fall through the 30s as the day wears on.
Much of whatever falls tomorrow will stick only to colder surfaces. This is not like last November 15, 2018 where we were dealing with a low coming up from the south and some solid Atlantic and Gulf moisture moving into established cold air. This is an arctic front set up where most times the precipitation dries up and shuts off so there is little room for upside here.
Cold air is moving in for Tuesday night and Wednesday in a big way. Wednesday morning lows will be in the teens to lower 20s which for this time of year is extremely cold. This is a very impressive shot of cold air coming down from Canada. Wednesday in spite of sunshine will see temperatures on the the upper 20s to near 30 inland and low to mid 30s from the big cities south and east.
While the core of the cold air moves out Wednesday night it moves into New England which sets up an onshore flow on Thursday. That will likely cause clouds to develop and slowing any kind of warm up. Highs should be back into the 40s Thursday. Another cold front approaches from the northwest Friday with another cold high moving southeast and building into New England. There won’t be much with the front ahead of it so we will see some sun to finish off the week with highs reaching the upper 40s and lower 50s before it turns a bit colder over the weekend. Low pressure will be coming out of the Gulf States and creep northeastward along the Southeast coast. late this week and into this weekend. We will look at this a bit closer later today.
MANY THANKS TO TROPICAL TIDBITS FOR THE USE OF MAPS
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