SNOW MAP: Powerful Nor’easter Headed Towards The Northeast
Significant impacts are expected late Wednesday into Thursday as a nor’easter will bring over a foot of snow to parts of the interior.
Precipitation will being to spread into the region around lunchtime on Wednesday. During the overnight hours, precipitation will push into Southern New England. Generally speaking, snow will last for about 10-13 hours, allowing for significant accumulations.
High pressure situated to our north will help keep the atmosphere below freezing for a majority of the region. The exception is I-95, around Philadelphia, where warm air from the flow around the low pressure system will heat the lower atmosphere, threatening a switch over to mixed precipitation.
This can be visualized observing temperatures above the surface:
Areas north and west of I-95 will be cold enough to stay snow for the entirety of the event.
Confidence in the going forecast is high as you head north and west of I-95. Significant travel disruptions are expected Wednesday night into Thursday as over a foot of snow is expected. As you head west of this 12-18″ zone, snow totals slowly taper off. A few reports of 12″+ are possible in Central PA. Southeastern PA has the potential to be a boom or bust. I went with a slightly warmer solution as sort range guidance seems to be leaning in this direction.