🤓 How about some good old fashioned science from the midnight shift? If you're around the Philly metro or adjacent areas of S NJ or SE PA, you may have noticed the shallow snowpack beginning to slowly fade away despite temps being too cold for any melting. Why is this? (1/5) This is due to a lesser known change of phase called sublimation, when ice (or any solid substance) changes directly into water vapor (or the gaseous phase). Have you ever noticed ice cubes sitting in your freezer for a long time start to shrink? This is the same process! (2/5)

There is an increasing threat for a significant and potentially prolonged coastal storm system to impact the region late this weekend into next week. Here are the key points: (thread) #NJWX #MDWX #DEWX #PAWX Precip could arrive as early as mid day Sunday & likely start as snow for most. Snow should continue for several hours into Sunday night with precipitation gradually becoming heavier by the overnight into Monday morning as winds also increase.