We can see here that the weather pattern across the whole country is very flat and zonal, there’s no strong signals of troughs or ridges and these zonal patterns lead to very quiet weather conditions, it usually would mean a very warm weather pattern as well, however with surface high pressure dominant feature just east of Maine that is leading to a cold NE wind flowing into the Northeast and Mid Atlantic , instead of the usually West – Southwest flow you would usually get with a pattern like this which would flood the country with warm pacific air.
This zonal patter is because of a strong storm system over Alaska, which is also preventing blocking or a negative NAO from developing, so we will remain in the same pattern for the next 7 days or so with overall sunny skies and not too much change in air mass, although we will warm up just a bit for Wednesday and Thanksgiving Thursday
Today through Tuesday will be overall pretty uniform with partly cloudy to clear skies , highs in the low to mid 40s NE PA and highs in the upper 40s to low 50s along the coast , lows in the mid 20s NE PA to low to mid 30s along the coast
By Wednesday a weak cold front will drop into the Midwest and northern plains, leading to a brief ridge of high pressure building over the southern ad Central plains, this will make the flow more WNW and lead to slight warming with highs in the mid to upper 40s NE PA to the low to mid 50s along the coast , lows in the upper 20s to low 30s NE PA to mid to upper 30s along the coast, obviously not any extreme warmth , as a matter of fact we are basically moderating from slightly below normal to around normal for a few days.
This weak cold front will drop south, it will collapse the ridge in the plains before it can make its way east and a colder air mass will begin to drop in, especially by Saturday.
Friday highs will be in the mid 40s NE PA to low 50s along the coast and lows back into the mid to upper 20s NE PA to low to mid 30s along the coast
By Saturday, we will get a little taste of what will be a pattern change by early December, the cold front will come through and a brief shot of modified arctic air will come through Saturday and Sunday with high only in the upper 30s NE PA to mid 40s along the coast. Lows in the low 20s NE PA to mid to upper 20s along the coast .