A blast of arctic air will spread into the region tonight and linger across the area into mid-week, yielding a couple of days of very chilly conditions by late March standards.
While temperatures are fairly mild this morning – and will approach 50F this afternoon – readings are below 0F north of the Great Lakes this morning and that air mass is surging southeastward toward New England.
The arctic boundary will cross the area tonight, sending temperatures tumbling after midnight, with readings falling into the 20s by Monday morning. Unfortunately, strong cold air advection will persist right through the day so temperatures will struggle to climb despite the strong late March sunshine. Daytime temperatures will only be in the lower and middle 30s tomorrow and will fall to 20 to 25F (with a biting wind) Monday night. Minimal recovery is expected Tuesday, with highs again stuck in the 30s.
There could be a snow shower or flurry around during the day tomorrow as the cold air deepens across the area.